Initial commit
diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..f441e61
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,3 @@
+node_modules
+elm-stuff
+dist
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4f61688
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+node_modules
+elm-stuff
+dist
+support
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..c2a4eac
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,8 @@
+# This is the list of Fuchsia Authors.
+
+# Names should be added to this file as one of
+#     Organization's name
+#     Individual's name <submission email address>
+#     Individual's name <submission email address> <email2> <emailN>
+
+Google Inc.
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..ecb11af
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,3 @@
+# v0.1.0
+
+- Initial release.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..81e2938
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,9 @@
+This repository accepts contributions using Gerrit.
+
+Instructions for using Gerrit:
+
+ * https://gerrit-review.googlesource.com/Documentation/
+
+Before we can land your change, you need to sign the Google CLA:
+
+ * https://cla.developers.google.com/
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..506969e
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,28 @@
+# Build the frontend.
+FROM node:10 as frontend
+WORKDIR /app
+# Install dependencies based only on package*.json for better caching.
+COPY frontend/package*.json ./
+RUN npm install
+COPY frontend ./
+RUN npm run build
+
+# Build the backend.
+FROM golang:1.13 as backend
+WORKDIR /app
+# Install dependencies based only on go.mod for better caching.
+COPY backend/go.mod ./
+RUN go mod download
+COPY backend ./
+RUN CGO_ENABLED=0 GOOS=linux go build -mod=readonly -v -o server
+
+# Create the final image.
+# Use alpine-glibc since C++ binaries like fidlc require glibc.
+FROM frolvlad/alpine-glibc:alpine-3.11_glibc-2.30
+RUN apk add --no-cache ca-certificates
+COPY --from=frontend /app/dist /static
+COPY --from=backend /app/server /server
+COPY support /support
+
+# Run the web server on container startup.
+CMD ["/server", "-static", "/static", "-bin", "/support/bin", "-fidl", "/support/fidl"]
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f9df5b8
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,27 @@
+Copyright 2020 The Fuchsia Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..7624d98
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,55 @@
+PORT ?= 8080
+VERBOSE ?= 0
+
+WATCH ?= 0
+
+.PHONY: all help frontend backend run format clean
+
+all: frontend backend support
+
+help:
+	@echo "Targets:"
+	@echo "    all        Build everything."
+	@echo "    help       Show this help message."
+	@echo "    frontend   Build the frontend/dist bundle using webpack."
+	@echo "               For more build options: cd frontend && npm run."
+	@echo "    backend    Build the backend/dist/fidlbolt server binary."
+	@echo "    support    Copy FIDL files and binaries from \$$FUCHSIA_DIR."
+	@echo "               Note: this remains up to date until suport/ is removed."
+	@echo "               To force a new copy: make -B support."
+	@echo "    run        Run the fidlbolt server on \$$PORT."
+	@echo "    format     Auto-format all code."
+	@echo "    clean      Remove all build/copied files."
+
+frontend: frontend/dist
+
+frontend/node_modules: frontend/package*.json
+	cd frontend && npm install
+
+frontend/dist: frontend/node_modules frontend/src/* frontend/src/elm/*
+	cd frontend && npm run build
+
+backend: backend/dist/fidlbolt
+
+backend/dist/fidlbolt: backend/*.go
+	cd backend && go build -o dist/fidlbolt .
+
+support:
+	./copy_support_files.sh
+
+run: all
+	./backend/dist/fidlbolt \
+		-static frontend/dist \
+		-bin support/bin \
+		-fidl support/fidl \
+		-port $(PORT) \
+		-verbose $(VERBOSE)
+
+format:
+	cd frontend && npm run fix
+	cd backend && go fmt
+
+clean:
+	rm -rf backend/dist
+	rm -rf frontend/dist
+	rm -rf support/
diff --git a/PATENTS b/PATENTS
new file mode 100644
index 0000000..2746e78
--- /dev/null
+++ b/PATENTS
@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Fuchsia project.
+
+Google hereby grants to you a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this
+section) patent license to make, have made, use, offer to sell, sell,
+import, transfer, and otherwise run, modify and propagate the contents
+of this implementation of Fuchsia, where such license applies only to
+those patent claims, both currently owned by Google and acquired in
+the future, licensable by Google that are necessarily infringed by
+this implementation. This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation. If you or your agent or exclusive licensee institute
+or order or agree to the institution of patent litigation or any other
+patent enforcement activity against any entity (including a
+cross-claim or counterclaim in a lawsuit) alleging that this
+implementation of Fuchsia constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of
+Fuchsia shall terminate as of the date such litigation is filed.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5fc4e7d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,66 @@
+# fidlbolt
+
+fidlbolt is web app for exploring FIDL code and bytes, inspired by Matt Godbolt's [Compiler Explorer][godbolt].
+
+## Get started
+
+To run a local fidlbolt server:
+
+1. Follow the [Fuchsia: Get Started][fuchsia] guide.
+2. Build FIDL tools: `fx build host_x64/{fidlc,fidlgen_{llcpp,hlcpp,rust,go,dart}} zircon/tools`.
+3. Ensure that you have [Go][] and [Node.js][] installed.
+4. Build and run with `make run`.
+5. View the app at `http://localhost:8080`.
+
+## Contributing
+
+### Backend
+
+The backend is written in Go 1.13. It uses [net/http][] to serve static files and handle POST requests.
+
+### Frontend
+
+The frontend is written in [Elm][] and [TypeScript][]. It uses [webpack][] for bundling.
+
+To set up the frontend:
+
+1. Install [Node.js][]. On Debian-based systems, use `sudo apt-get install nodejs`.
+2. `cd frontend && npm install`
+
+Then, use one of the commands listed in `npm run`:
+
+- `npm run dev`: build in development mode
+- `npm run watch`: rebuild in development mode on every file change
+- `npm run tc`: typecheck TypeScript files
+- `npm run lint`: run eslint on TypeScript files
+- `npm run fix`: format and fix lint issues in TypeScript and Elm files
+- `npm run build`: build in production mode
+
+The build commands read files in `frontend/src/` and generate output in `frontend/dist/`.
+
+### Style
+
+Before making a CL, always run `make format`.
+
+## Deployment
+
+The project uses [Docker][] for containerized deployment.
+
+To build and run a new image locally:
+
+1. Install [Docker][]. On Debian-based systems, use `sudo apt-get install docker-ce`.
+2. Run `./copy_support_files.sh` to get the latest FIDL files and binaries from your Fuchsia repository.
+3. `docker image build -t fidlbolt .`
+4. `docker container run --publish 8080:8080 --detach --name fb fidlbolt`
+
+You might need to use `sudo` with the Docker commands.
+
+[Docker]: https://www.docker.com/
+[Elm]: https://elm-lang.org/
+[Go]: https://golang.org/
+[Node.js]: https://nodejs.org/
+[TypeScript]: https://www.typescriptlang.org/
+[fuchsia]: https://fuchsia.dev/fuchsia-src/getting_started
+[godbolt]: https://godbolt.org/
+[net/http]: https://golang.org/pkg/net/http/
+[webpack]: https://webpack.js.org/
diff --git a/backend/bytes.go b/backend/bytes.go
new file mode 100644
index 0000000..b44349c
--- /dev/null
+++ b/backend/bytes.go
@@ -0,0 +1,213 @@
+// Copyright 2020 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package main
+
+import (
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+	"text/scanner"
+	"unicode"
+)
+
+func parseBytes(input string) ([]byte, scanner.Position, error) {
+	var s scanner.Scanner
+	s.Init(strings.NewReader(input))
+	s.Filename = "fidlbolt.bytes"
+	s.Mode = scanner.ScanStrings | scanner.ScanComments | scanner.SkipComments
+
+	var err error
+	s.Error = func(s *scanner.Scanner, msg string) {
+		err = errors.New(msg)
+	}
+
+	var result []byte
+	var token strings.Builder
+	for tok := s.Scan(); tok != scanner.EOF && err == nil; tok = s.Scan() {
+		endToken := false
+		switch tok {
+		case scanner.String:
+			var str string
+			str, err = strconv.Unquote(s.TokenText())
+			if err != nil {
+				break
+			}
+			result = append(result, []byte(str)...)
+		case ',', '[', ']', '(', ')', '{', '}':
+			endToken = true
+		default:
+			token.WriteRune(tok)
+			switch s.Peek() {
+			case '\t', '\n', '\r', ' ', scanner.EOF:
+				endToken = true
+			}
+		}
+		if err != nil {
+			break
+		}
+		if endToken && token.Len() > 0 {
+			var b []byte
+			b, err = parseToken(token.String())
+			if err != nil {
+				break
+			}
+			token.Reset()
+			result = append(result, b...)
+		}
+	}
+	if err != nil {
+		return nil, s.Position, err
+	}
+	return result, s.Position, nil
+}
+
+func parseToken(text string) ([]byte, error) {
+	negative := false
+	if strings.HasPrefix(text, "-") {
+		negative = true
+		text = text[1:]
+	}
+	var suffix string
+	i := strings.LastIndexAny(text, "ui")
+	if i != -1 {
+		suffix = text[i:]
+		text = text[:i]
+	}
+	if suffix == "" {
+		if negative {
+			return nil, fmt.Errorf("invalid use of negation")
+		}
+		if strings.HasPrefix(text, "0x") {
+			text = text[2:]
+		}
+		if len(text)%2 != 0 {
+			return nil, fmt.Errorf("hex must have an even number of characters")
+		}
+		for _, c := range text {
+			if !(('0' <= c && c <= '9') || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f')) {
+				return nil, fmt.Errorf("invalid character %q", string(c))
+			}
+		}
+		return hex.DecodeString(text)
+	}
+	num, err := strconv.ParseUint(text, 0, 64)
+	if err != nil {
+		return nil, err
+	}
+	var signed bool
+	switch suffix[0] {
+	case 'u':
+		signed = false
+		if negative {
+			return nil, fmt.Errorf("cannot have negative unsigned number")
+		}
+	case 'i':
+		signed = true
+	default:
+		return nil, fmt.Errorf("invalid number suffix %q", suffix)
+	}
+	bits, err := strconv.ParseUint(suffix[1:], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	if bits != 8 && bits != 16 && bits != 32 && bits != 64 {
+		return nil, fmt.Errorf("invalid bit width %d", bits)
+	}
+	max := uint64(1) << bits
+	if signed {
+		max = uint64(1) << (bits - 1)
+		if !negative {
+			max--
+		}
+	}
+	if num >= max && max != 0 {
+		return nil, fmt.Errorf("%s out of range for %s", text, suffix)
+	}
+	if negative {
+		// Num is uint64, so this will wrap around, storing the two's
+		// complement. We do this instead of just parsing the full text
+		// (possibly with "-") as int64 because with int64 we would not
+		// be able to store the largest u64 values.
+		num = -num
+	}
+	switch bits {
+	case 8:
+		return []byte{byte(num)}, nil
+	case 16:
+		return []byte{byte(num & 0xff), byte(num >> 8 & 0xff)}, nil
+	case 32:
+		return []byte{
+			byte(num & 0xff), byte(num >> 8 & 0xff), byte(num >> 16 & 0xff), byte(num >> 24 & 0xff),
+		}, nil
+	case 64:
+		return []byte{
+			byte(num & 0xff), byte(num >> 8 & 0xff), byte(num >> 16 & 0xff), byte(num >> 24 & 0xff),
+			byte(num >> 32 & 0xff), byte(num >> 40 & 0xff), byte(num >> 48 & 0xff), byte(num >> 56 & 0xff),
+		}, nil
+	}
+	return nil, fmt.Errorf("non-exhaustive")
+}
+
+func formatBytes(bytes []byte, options *Options) (string, error) {
+	byteFmt, offsetFmt := "%02x", "%08x: "
+	if options.Capital {
+		byteFmt, offsetFmt = "%02X", "%08X: "
+	}
+	group := options.Group
+	if group < 1 {
+		group = 1
+	}
+	if group > options.Columns {
+		group = options.Columns
+	}
+	for options.Columns%group != 0 {
+		group--
+	}
+
+	var builder strings.Builder
+	writeASCII := func(start, end int) {
+		builder.WriteString("  // ")
+		for i := start; i < end; i++ {
+			r := rune(bytes[i])
+			if r <= unicode.MaxASCII && unicode.IsPrint(r) {
+				builder.WriteRune(r)
+			} else {
+				builder.WriteByte('.')
+			}
+		}
+	}
+
+	for i, b := range bytes {
+		if i%options.Columns == 0 {
+			if i != 0 {
+				if options.ASCII {
+					writeASCII(i-options.Columns, i)
+				}
+				builder.WriteByte('\n')
+			}
+			if options.Offsets {
+				builder.WriteString(fmt.Sprintf(offsetFmt, i))
+			}
+		} else if i%group == 0 {
+			builder.WriteByte(' ')
+		}
+		builder.WriteString(fmt.Sprintf(byteFmt, b))
+	}
+	if options.ASCII {
+		last := len(bytes) % options.Columns
+		left := options.Columns - last
+		if last == 0 {
+			left = 0
+		}
+		spaces := left/group*(group*2+1) + left%group*2
+		for i := 0; i < spaces; i++ {
+			builder.WriteByte(' ')
+		}
+		writeASCII(len(bytes)-last, len(bytes))
+	}
+	return builder.String(), nil
+}
diff --git a/backend/go.mod b/backend/go.mod
new file mode 100644
index 0000000..fafed6e
--- /dev/null
+++ b/backend/go.mod
@@ -0,0 +1,3 @@
+module fidlbolt
+
+go 1.13
diff --git a/backend/library.go b/backend/library.go
new file mode 100644
index 0000000..5b2f7d8
--- /dev/null
+++ b/backend/library.go
@@ -0,0 +1,486 @@
+// Copyright 2020 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strings"
+	"sync"
+)
+
+// A library is a FIDL library represented by its name (as spelled in its
+// "library" declaration, not necessarily matching directory or file names).
+type library string
+
+// A libraryMap stores information derived about a group of libraries.
+type libraryMap map[library]libraryInfo
+
+type libraryInfo struct {
+	// Directory containing the library.
+	dir string
+	// FIDL files that make up the library (relative to dir, or absolute).
+	files []string
+	// Direct dependencies (imported by "using" declarations in files).
+	deps []library
+}
+
+// A libraryCache is a thread-safe, append-only libraryMap.
+type libraryCache struct {
+	sync.RWMutex
+	libs libraryMap
+}
+
+func (c *libraryCache) get(lib library) (libraryInfo, bool) {
+	c.RLock()
+	defer c.RUnlock()
+	info, ok := c.libs[lib]
+	return info, ok
+}
+
+func (c *libraryCache) storeNew(libs libraryMap) {
+	// Avoid write contention by skipping the operation if all the libraries in
+	// libs are already in the cache.
+	if !c.hasNew(libs) {
+		return
+	}
+	c.Lock()
+	defer c.Unlock()
+	for lib, info := range libs {
+		if _, ok := c.libs[lib]; !ok {
+			c.libs[lib] = info
+		}
+	}
+}
+
+func (c *libraryCache) hasNew(libs libraryMap) bool {
+	c.RLock()
+	defer c.RUnlock()
+	for lib := range libs {
+		if _, ok := c.libs[lib]; !ok {
+			return true
+		}
+	}
+	return false
+}
+
+// libraryAnalyzer analyzes FIDL files to infer library dependencies. It caches
+// information to speed up future analyses.
+type libraryAnalyzer struct {
+	// Paths in which to search for FIDL library files. Given library foo.bar,
+	// the analyzer will check P/foo.bar and P/foo-bar for each path P in paths.
+	// If one of these exists, it reads all descendent .fidl files.
+	paths []string
+	// Global cache of library information.
+	cache libraryCache
+}
+
+func newLibraryAnalyzer(paths []string) *libraryAnalyzer {
+	return &libraryAnalyzer{
+		paths: paths,
+		cache: libraryCache{
+			libs: make(libraryMap),
+		},
+	}
+}
+
+const existingLibraryNotice = "" +
+	"NOTE: Your file will be compiled with the others in this library. " +
+	"If you don't want this behavior, choose a different library name."
+
+// analyze analyzes content, returning a libraryMap that includes content's
+// library together with all its transitive dependencies, and annotations on the
+// "library" and "using" declarations indicating their inferred location. It
+// assumes that filename is a FIDL file containing content. If any library
+// cannot be located in a.paths, it is silently ignored.
+func (a *libraryAnalyzer) analyze(filename, content string) (libraryMap, []Annotation) {
+	result := make(libraryMap)
+
+	// Start with a stack containing the root library (if it's a platform source
+	// library, meaning we can expect to find it in the tree) and its imports.
+	var stack []library
+	rootLibraryMatch, rootLibraryOk := parseLibraryMatch(content)
+	if rootLibraryOk && rootLibraryMatch.lib.isPlatform() {
+		stack = append(stack, rootLibraryMatch.lib)
+	}
+	rootImports := parsePlatformImportsMatch(content)
+	for _, m := range rootImports {
+		stack = append(stack, m.lib)
+	}
+
+	// Explore all dependencies via depth-first search.
+	for len(stack) != 0 {
+		// Pop a library and check if it needs processing.
+		var lib library
+		lib, stack = stack[len(stack)-1], stack[:len(stack)-1]
+		if _, ok := result[lib]; ok {
+			continue
+		}
+
+		// Check the analyzer's cache.
+		if info, ok := a.cache.get(lib); ok {
+			result[lib] = info
+			stack = append(stack, info.deps...)
+			continue
+		}
+
+		// Find the library's files and dependencies.
+		var info libraryInfo
+		for _, path := range a.paths {
+			for _, dir := range lib.possibleDirs() {
+				if !info.empty() {
+					break
+				}
+				info.dir = filepath.Join(path, dir)
+				// Keep track of already-seen imports to ensure that info.deps
+				// has no duplicates (there won't be duplicates in a valid FIDL
+				// file, but separate files might import the same library).
+				seen := map[library]struct{}{}
+				// Visit all .fidl files, including in subdirectories:
+				filepath.Walk(info.dir, func(file string, fi os.FileInfo, err error) error {
+					if err != nil || fi.IsDir() || filepath.Ext(file) != ".fidl" {
+						return err
+					}
+					rel, err := filepath.Rel(info.dir, file)
+					if err != nil {
+						return err
+					}
+					b, err := ioutil.ReadFile(file)
+					if err != nil {
+						return err
+					}
+					declaredLib, ok := parseLibrary(b)
+					if !ok || declaredLib != lib {
+						return nil
+					}
+					info.files = append(info.files, rel)
+					for _, dep := range parsePlatformImports(b) {
+						if _, ok := seen[dep]; ok {
+							continue
+						}
+						seen[dep] = struct{}{}
+						info.deps = append(info.deps, dep)
+						stack = append(stack, dep)
+					}
+					return nil
+				})
+			}
+		}
+		if !info.empty() {
+			result[lib] = info
+		}
+	}
+
+	// Cache reusable results first, before adding request-specific information.
+	a.cache.storeNew(result)
+
+	// The following handles two cases:
+	//   1. (More common) The user typed something like `library foo;`. This
+	//      is a new library outside the source tree, consisting of one file.
+	//   2. The user typed something like `library fuchsia.io;`. This behaves as
+	//      if they were adding a new file to the fuchsia.io library, alongside
+	//      the other ones in the source tree.
+	rootLib := rootLibraryMatch.lib
+	if !rootLibraryOk {
+		// The name doesn't really matter. We just need an entry in the map.
+		rootLib = "fidlbolt"
+	}
+	var anns []Annotation
+	rootInfo := libraryInfo{files: []string{filename}}
+	for _, m := range rootImports {
+		rootInfo.deps = append(rootInfo.deps, m.lib)
+		if info, ok := result[m.lib]; ok {
+			text := fmt.Sprintf("Found %s in %s", m.lib, info.userVisibleDir())
+			anns = append(anns, m.annotation(Info, text))
+		}
+	}
+	if info, ok := result[rootLib]; ok {
+		rootInfo = mergeInfo(rootInfo, info)
+		if rootLibraryOk {
+			text := fmt.Sprintf("Found %s in %s\n\n%s",
+				rootLib, info.userVisibleDir(), existingLibraryNotice)
+			anns = append(anns, rootLibraryMatch.annotation(Info, text))
+		}
+	}
+	result[rootLib] = rootInfo
+
+	return result, anns
+}
+
+// fidlcFileArgs returns a list of arguments to pass to fidlc to compile the
+// libraries in m. This is a fairly expensive operation. It returns an error if
+// there is an import cycle.
+func (m libraryMap) fidlcFileArgs() ([]string, error) {
+	sorted, err := m.topologicalSort()
+	if err != nil {
+		return nil, err
+	}
+
+	// Iterate in reverse order so that dependencies come before dependents.
+	var args []string
+	for i := len(sorted) - 1; i >= 0; i-- {
+		lib := sorted[i]
+		args = append(args, "--files")
+		info := m[lib]
+		for _, file := range info.files {
+			// When the user declares their file as belong to an existing
+			// library, their file will be an absolute path in a temp directory.
+			// Otherwise, all files are relative to info.dir.
+			if filepath.IsAbs(file) {
+				args = append(args, file)
+			} else {
+				args = append(args, filepath.Join(info.dir, file))
+			}
+		}
+	}
+	return args, nil
+}
+
+const jsonDepIndentSize = 4
+
+// jsonDependencyGraph returns a JSON object encoded as a string representing
+// the dependency graph of m. Each key is a library name, and each value is
+// another object whose keys are its direct dependencies.
+func (m libraryMap) jsonDependencyGraph() (string, error) {
+	// Make sure there are no cycles, otherwise this will never terminate.
+	if _, err := m.topologicalSort(); err != nil {
+		return "", err
+	}
+
+	sources := map[library]struct{}{}
+	for lib := range m {
+		sources[lib] = struct{}{}
+	}
+	for _, info := range m {
+		for _, dep := range info.deps {
+			delete(sources, dep)
+		}
+	}
+	var start []string
+	for lib := range sources {
+		start = append(start, string(lib))
+	}
+	sort.Strings(start)
+
+	var b strings.Builder
+	indent := 0
+	var gen func(libs []string)
+	gen = func(libs []string) {
+		b.WriteString("{\n")
+		indent++
+		for i, lib := range libs {
+			b.WriteString(strings.Repeat(" ", indent*jsonDepIndentSize))
+			b.WriteString(fmt.Sprintf(`"%s": `, lib))
+			deps := m[library(lib)].deps
+			if len(deps) == 0 {
+				b.WriteString("{}")
+			} else {
+				var next []string
+				for _, dep := range deps {
+					next = append(next, string(dep))
+				}
+				sort.Strings(next)
+				gen(next)
+			}
+			if i == len(libs)-1 {
+				b.WriteString("\n")
+			} else {
+				b.WriteString(",\n")
+			}
+		}
+		indent--
+		b.WriteString(strings.Repeat(" ", indent*jsonDepIndentSize))
+		b.WriteString("}")
+	}
+	gen(start)
+	return b.String(), nil
+}
+
+// topologicalSort runs topological sort on m, whose deps fields define a
+// directed graph in adjacency list form. In the resulting list, libraries only
+// depend on other libraries later in the list, not on earlier ones. Returns
+// an error if there is a cycle.
+func (m libraryMap) topologicalSort() ([]library, error) {
+	var sorted []library
+	incoming := map[library]int{}
+	for u := range m {
+		incoming[u] = 0
+	}
+	for _, info := range m {
+		for _, v := range info.deps {
+			incoming[v]++
+		}
+	}
+	var src []library
+	for u, deg := range incoming {
+		if deg == 0 {
+			src = append(src, u)
+		}
+	}
+	for len(src) != 0 {
+		var u library
+		u, src = src[len(src)-1], src[:len(src)-1]
+		sorted = append(sorted, u)
+		for _, v := range m[u].deps {
+			incoming[v]--
+			if incoming[v] == 0 {
+				src = append(src, v)
+			}
+		}
+	}
+	for _, deg := range incoming {
+		if deg != 0 {
+			return nil, errors.New("detected an import cycle")
+		}
+	}
+	return sorted, nil
+}
+
+// possibleDirs returns directory names that lib's files might be found in.
+func (lib library) possibleDirs() []string {
+	return []string{string(lib), strings.ReplaceAll(string(lib), ".", "-")}
+}
+
+// isPlatform returns true if lib adheres to the naming scheme for platform
+// source libraries (enforced by the FIDL linter).
+func (lib library) isPlatform() bool {
+	s := string(lib)
+	return strings.HasPrefix(s, "fidl.") ||
+		strings.HasPrefix(s, "fuchsia.") ||
+		strings.HasPrefix(s, "test.")
+}
+
+// empty returns true if i represents an empty library (has no files).
+func (i *libraryInfo) empty() bool {
+	return len(i.files) == 0
+}
+
+// userVisibleDir returns a representation of i.dir to show to the user.
+func (i *libraryInfo) userVisibleDir() string {
+	dir := filepath.ToSlash(i.dir)
+	if i := strings.Index(dir, "/fuchsia/"); i != -1 {
+		return dir[i+1:]
+	}
+	return dir
+}
+
+// mergeInfo returns a combination of the information in info and other. It
+// assumes that only one of them has dir set.
+func mergeInfo(info, other libraryInfo) libraryInfo {
+	if info.dir != "" && other.dir != "" {
+		panic("mergeInfo called with incompatible dirs")
+	}
+	if info.dir == "" {
+		info.dir = other.dir
+	}
+	info.files = append(info.files, other.files...)
+	deps := map[library]struct{}{}
+	for _, lib := range info.deps {
+		deps[lib] = struct{}{}
+	}
+	for _, lib := range other.deps {
+		if _, ok := deps[lib]; !ok {
+			info.deps = append(info.deps, lib)
+		}
+	}
+	return info
+}
+
+var (
+	// https://fuchsia.dev/fuchsia-src/development/languages/fidl/reference/language.md#identifiers
+	fidlIdentifierPattern = `[a-zA-Z](?:[a-zA-Z0-9_]*[a-zA-Z0-9])?`
+
+	// Although "library" can be used anywhere (e.g. as a type name), this regex
+	// is robust because the the library declaration must appear at the top of
+	// the file (only comments and whitespace can precede it).
+	libraryRegexp = regexp.MustCompile(`` +
+		`^(?:\s*//[^\n]*\n)*\s*` +
+		`library\s+(` +
+		fidlIdentifierPattern +
+		`(?:\.` + fidlIdentifierPattern + `)*` +
+		`)\s*;`)
+
+	// Although "using" can be used anywhere (e.g. as a type name), this regex
+	// is robust because it only matches imports of platform libraries (ones
+	// that start with fidl, fuchsia, or test). The only problem is it can match
+	// commented imports, so we have to check for this after matching.
+	platformImportRegexp = regexp.MustCompile(`` +
+		`\busing\s+(` +
+		`(?:fidl|fuchsia|test)` +
+		`(?:\.` + fidlIdentifierPattern + `)+` +
+		`)` +
+		`(?:\s+as\s+` + fidlIdentifierPattern + `)?` +
+		`\s*;`)
+)
+
+type libraryMatch struct {
+	lib          library
+	line, column int
+}
+
+func parseLibrary(fidl []byte) (library, bool) {
+	m := libraryRegexp.FindSubmatch(fidl)
+	if m == nil {
+		return "", false
+	}
+	return library(m[1]), true
+}
+
+func parseLibraryMatch(fidl string) (libraryMatch, bool) {
+	m := libraryRegexp.FindStringSubmatchIndex(fidl)
+	if m == nil {
+		return libraryMatch{}, false
+	}
+	return toLibraryMatch(fidl, m[2], m[3]), true
+}
+
+func parsePlatformImports(fidl []byte) []library {
+	var libs []library
+	for _, m := range platformImportRegexp.FindAllSubmatchIndex(fidl, -1) {
+		// Make sure the line isn't commented. Technically this breaks if the
+		// line contains a string const with "//" in it. This isn't a big deal
+		// because imports are supposed to come before all other declarations.
+		i := bytes.LastIndexByte(fidl[:m[2]], '\n')
+		if i == -1 || !bytes.Contains(fidl[i:m[2]], []byte("//")) {
+			libs = append(libs, library(fidl[m[2]:m[3]]))
+		}
+	}
+	return libs
+}
+
+func parsePlatformImportsMatch(fidl string) []libraryMatch {
+	var libs []libraryMatch
+	for _, m := range platformImportRegexp.FindAllStringSubmatchIndex(fidl, -1) {
+		// See the comment in parsePlatformImports.
+		i := strings.LastIndexByte(fidl[:m[2]], '\n')
+		if i == -1 || !strings.Contains(fidl[i:m[2]], "//") {
+			libs = append(libs, toLibraryMatch(fidl, m[2], m[3]))
+		}
+	}
+	return libs
+}
+
+func toLibraryMatch(fidl string, start, end int) libraryMatch {
+	return libraryMatch{
+		lib:    library(fidl[start:end]),
+		line:   strings.Count(fidl[:start], "\n") + 1,
+		column: start - strings.LastIndexByte(fidl[:start], '\n'),
+	}
+}
+
+func (m *libraryMatch) annotation(kind AnnotationKind, text string) Annotation {
+	return Annotation{
+		Line:   m.line,
+		Column: m.column,
+		Kind:   kind,
+		Text:   text,
+	}
+}
diff --git a/backend/main.go b/backend/main.go
new file mode 100644
index 0000000..647d550
--- /dev/null
+++ b/backend/main.go
@@ -0,0 +1,196 @@
+// Copyright 2020 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+var (
+	portFlag    = flag.String("port", "", "port to serve on")
+	verboseFlag = flag.Bool("verbose", false, "enable verbose logging")
+	staticFlag  = flag.String("static", "", "static files directory")
+	binFlag     = flag.String("bin", "", "binary search paths, "+pathHelp)
+	fidlFlag    = flag.String("fidl", "", "FIDL library search paths, "+pathHelp)
+
+	pathHelp = fmt.Sprintf(`separated by "%s"`, string(filepath.ListSeparator))
+)
+
+func printUsage() {
+	program := filepath.Base(os.Args[0])
+	message :=
+		`Usage: ` + program + ` [flags]
+
+Web server for fidlbolt, a tool for exploring FIDL code and bytes
+
+Flags:
+`
+
+	fmt.Fprint(flag.CommandLine.Output(), message)
+	flag.PrintDefaults()
+}
+
+func main() {
+	flag.Usage = printUsage
+	flag.Parse()
+
+	static := *staticFlag
+	bin := filepath.SplitList(*binFlag)
+	fidl := filepath.SplitList(*fidlFlag)
+	if static == "" || len(bin) == 0 || len(fidl) == 0 {
+		fuchsia := getFuchsiaDir()
+		if static == "" {
+			static = filepath.Join(filepath.Dir(fuchsia), "fidlbolt", "frontend", "dist")
+		}
+		if len(bin) == 0 {
+			build := getBuildDir(fuchsia)
+			bin = []string{
+				filepath.Join(build, "host_x64"),
+				filepath.Join(build+".zircon", "tools"),
+			}
+		}
+		if len(fidl) == 0 {
+			fidl = []string{
+				filepath.Join(fuchsia, "sdk", "fidl"),
+				filepath.Join(fuchsia, "zircon", "system", "fidl"),
+			}
+		}
+	}
+	checkDirs(static)
+	checkDirs(bin...)
+	checkDirs(fidl...)
+
+	server, err := NewServer(bin, fidl)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	mux := http.NewServeMux()
+	mux.Handle("/", http.FileServer(http.Dir(static)))
+	mux.Handle("/convert", &postHandler{server, *verboseFlag})
+
+	timeout := 10 * time.Second
+	handler := http.TimeoutHandler(
+		mux, timeout, fmt.Sprintf("Request exceeded the %v time limit", timeout))
+	handler = logging(handler)
+
+	port := *portFlag
+	if port == "" {
+		port = os.Getenv("PORT")
+		if port == "" {
+			port = "8080"
+		}
+	}
+
+	s := &http.Server{
+		Addr:         ":" + port,
+		Handler:      handler,
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: timeout + 5*time.Second,
+	}
+	log.Printf("Listening on %s", s.Addr)
+	log.Fatal(s.ListenAndServe())
+}
+
+type postHandler struct {
+	server  *Server
+	verbose bool
+}
+
+func (h *postHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		writeError(w, http.StatusMethodNotAllowed, nil)
+		return
+	}
+	if r.Body == nil {
+		writeError(w, http.StatusBadRequest, nil)
+		return
+	}
+	var request Request
+	if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
+		writeError(w, http.StatusBadRequest, err)
+		return
+	}
+	if h.verbose {
+		log.Printf("Request body: %#v", request)
+	}
+	if err := request.Validate(); err != nil {
+		writeError(w, http.StatusUnprocessableEntity, err)
+		return
+	}
+	response, err := h.server.Serve(r.Context(), &request)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err)
+		return
+	}
+	body, err := json.Marshal(response)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	w.Write(body)
+}
+
+func getFuchsiaDir() string {
+	dir, ok := os.LookupEnv("FUCHSIA_DIR")
+	if !ok {
+		log.Fatal("Must set FUCHSIA_DIR or provide all flags")
+	}
+	return dir
+}
+
+func getBuildDir(fuchsia string) string {
+	b, err := ioutil.ReadFile(filepath.Join(fuchsia, ".fx-build-dir"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	return filepath.Join(fuchsia, strings.TrimSpace(string(b)))
+}
+
+func checkDirs(dirs ...string) {
+	for _, dir := range dirs {
+		if _, err := os.Stat(dir); os.IsNotExist(err) {
+			log.Fatalf("%s: directory does not exist", dir)
+		}
+	}
+}
+
+type statusWriter struct {
+	http.ResponseWriter
+	status int
+}
+
+func (sw *statusWriter) WriteHeader(status int) {
+	sw.status = status
+	sw.ResponseWriter.WriteHeader(status)
+}
+
+func logging(handler http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("[%s] %s %s", r.RemoteAddr, r.Method, r.URL)
+		sw := statusWriter{ResponseWriter: w}
+		handler.ServeHTTP(&sw, r)
+		log.Printf("[%s] -> %d %s", r.RemoteAddr, sw.status, http.StatusText(sw.status))
+	})
+}
+
+func writeError(w http.ResponseWriter, code int, err error) {
+	text := fmt.Sprintf("%d %s", code, http.StatusText(code))
+	http.Error(w, text, code)
+	if err != nil {
+		log.Printf("ERROR: %s", err.Error())
+	}
+}
diff --git a/backend/server.go b/backend/server.go
new file mode 100644
index 0000000..a9b3934
--- /dev/null
+++ b/backend/server.go
@@ -0,0 +1,584 @@
+// Copyright 2020 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package main
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// A Server handles fidlbolt requests.
+type Server struct {
+	// External programs used by fidlbolt.
+	fidlFormat, fidlLint, fidlc, fidlgenLlcpp, fidlgenHlcpp, fidlgenRust,
+	fidlgenGo, fidlgenDart program
+	// Cache of FIDL library information.
+	libraryAnalyzer *libraryAnalyzer
+}
+
+// NewServer returns a new fidlbolt server. It takes two lists of paths: bin,
+// for locating binaries, and fidl, for locating FIDL libraries. Returns an
+// error if a required program could not be located in bin.
+func NewServer(bin, fidl []string) (*Server, error) {
+	var s Server
+	var err error
+	s.fidlFormat, err = findProgram("fidl-format", bin)
+	if err != nil {
+		return nil, err
+	}
+	s.fidlLint, err = findProgram("fidl-lint", bin)
+	if err != nil {
+		return nil, err
+	}
+	s.fidlc, err = findProgram("fidlc", bin)
+	if err != nil {
+		return nil, err
+	}
+	s.fidlgenLlcpp, err = findProgram("fidlgen_llcpp", bin)
+	if err != nil {
+		return nil, err
+	}
+	s.fidlgenHlcpp, err = findProgram("fidlgen_hlcpp", bin)
+	if err != nil {
+		return nil, err
+	}
+	s.fidlgenRust, err = findProgram("fidlgen_rust", bin)
+	if err != nil {
+		return nil, err
+	}
+	s.fidlgenGo, err = findProgram("fidlgen_go", bin)
+	if err != nil {
+		return nil, err
+	}
+	s.fidlgenDart, err = findProgram("fidlgen_dart", bin)
+	if err != nil {
+		return nil, err
+	}
+	s.libraryAnalyzer = newLibraryAnalyzer(fidl)
+	return &s, nil
+}
+
+// A Request provides input to be converted to an output mode.
+type Request struct {
+	// Content to be converted.
+	Content string `json:"content"`
+	// The mode of Content.
+	InputMode Mode `json:"inputMode"`
+	// The desired output mode.
+	OutputMode Mode `json:"outputMode"`
+	// Options for configuring the conversion.
+	Options Options `json:"options"`
+	// Request context (not serialized).
+	ctx context.Context
+}
+
+// A Response contains the result of converting to an output mode.
+type Response struct {
+	// True if conversion was successful.
+	Ok bool `json:"ok"`
+	// If Ok is true, Content contains the conversion result (in the requested
+	// output mode). Otherwise, it contains an error message.
+	Content string `json:"content"`
+	// List of annotations to apply to on the input.
+	Annotations []Annotation `json:"annotations"`
+}
+
+// Options are used to configure mode conversions.
+type Options struct {
+	// File to generate (header, source, etc.).
+	File string `json:"file"`
+	// Lint in addition to formatting.
+	Lint bool `json:"lint"`
+	// Number of byte columns.
+	Columns int `json:"columns"`
+	// Byte grouping size.
+	Group int `json:"group"`
+	// Use capital letters for hex values.
+	Capital bool `json:"capital"`
+	// Show byte offsets at the start of each line.
+	Offsets bool `json:"offsets"`
+	// Show ASCII characters at the end of lines like xxd.
+	ASCII bool `json:"ascii"`
+}
+
+// An Annotation is a message targeted at a specific location of a file.
+type Annotation struct {
+	// One-based line number.
+	Line int `json:"line"`
+	// One-based column number.
+	Column int `json:"column"`
+	// Kind of annotation.
+	Kind AnnotationKind `json:"kind"`
+	// Body of the annotation.
+	Text string `json:"text"`
+}
+
+// AnnotationKind is a string enum for Annotation.
+type AnnotationKind string
+
+// Enumeration of AnnotationKind values.
+const (
+	Info    AnnotationKind = "info"
+	Warning                = "warning"
+	Error                  = "error"
+)
+
+// A Mode is an input or output format.
+type Mode string
+
+// Enumeration of Mode values.
+const (
+	Bytes     Mode = "bytes"
+	BytesPlus      = "bytes+"
+	C              = "c"
+	Dart           = "dart"
+	Diff           = "diff"
+	FIDL           = "fidl"
+	FIDLText       = "fidltext"
+	Go             = "go"
+	HLCPP          = "hlcpp"
+	JSON           = "json"
+	LLCPP          = "llcpp"
+	Rust           = "rust"
+)
+
+type modeSet = map[Mode]struct{}
+
+var inputModes = modeSet{
+	FIDL:     {},
+	FIDLText: {},
+	Bytes:    {},
+}
+
+func outputModes(input Mode) modeSet {
+	switch input {
+	case FIDL:
+		return modeSet{
+			FIDL:  {},
+			JSON:  {},
+			C:     {},
+			LLCPP: {},
+			HLCPP: {},
+			Rust:  {},
+			Go:    {},
+			Dart:  {},
+		}
+	case FIDLText:
+		return modeSet{
+			FIDLText:  {},
+			Bytes:     {},
+			BytesPlus: {},
+		}
+	case Bytes:
+		return modeSet{
+			Bytes:     {},
+			Diff:      {},
+			FIDLText:  {},
+			BytesPlus: {},
+		}
+	}
+	return modeSet{}
+}
+
+// Validate validates a request. Once validated, any errors in processing the
+// request are considered internal server errors.
+func (r *Request) Validate() error {
+	if err := r.InputMode.validate(inputModes); err != nil {
+		return err
+	}
+	if err := r.OutputMode.validate(outputModes(r.InputMode)); err != nil {
+		return err
+	}
+
+	switch r.OutputMode {
+	case JSON:
+		switch r.Options.File {
+		case "ir", "schema", "deps":
+		default:
+			return fmt.Errorf("invalid JSON IR file option: %q", r.Options.File)
+		}
+	case HLCPP, LLCPP:
+		switch r.Options.File {
+		case "header", "source", "tables":
+		default:
+			return fmt.Errorf("invalid C++ file option: %q", r.Options.File)
+		}
+	case C:
+		switch r.Options.File {
+		case "header", "client", "server", "tables":
+		default:
+			return fmt.Errorf("invalid C file option: %q", r.Options.File)
+		}
+	case Dart:
+		switch r.Options.File {
+		case "library", "test":
+		default:
+			return fmt.Errorf("invalid Dart file option: %q", r.Options.File)
+		}
+	default:
+		if r.Options.File != "" {
+			return fmt.Errorf("unexpected file option: %q", r.Options.File)
+		}
+	}
+
+	if r.OutputMode == Bytes {
+		if r.Options.Columns <= 0 {
+			return fmt.Errorf("invalid columns: %d", r.Options.Columns)
+		}
+		if r.Options.Group <= 0 {
+			return fmt.Errorf("invalid group: %d", r.Options.Group)
+		}
+	}
+
+	return nil
+}
+
+func (m Mode) validate(allowed modeSet) error {
+	if _, ok := allowed[m]; !ok {
+		return fmt.Errorf("invalid mode: %q", m)
+	}
+	return nil
+}
+
+// Serve processes a request and serves a response. It returns an error if the
+// request could not be processed for some reason (e.g., an IO failure).
+func (s *Server) Serve(ctx context.Context, r *Request) (Response, error) {
+	r.ctx = ctx
+	switch r.InputMode {
+	case FIDL:
+		return s.handleFIDL(r)
+	case FIDLText:
+		return s.handleFIDLText(r)
+	case Bytes:
+		return s.handleBytes(r)
+	}
+	return internalErrorf("invalid input mode: %q", r.InputMode)
+}
+
+func (s *Server) handleFIDL(r *Request) (Response, error) {
+	temp, err := newTempDir()
+	if err != nil {
+		return internalError(err)
+	}
+	defer os.RemoveAll(temp.path)
+	res, err := s.handleFIDLWithTemp(r, temp)
+	if err != nil {
+		return res, err
+	}
+	// Remove all occurrences of the temp path to avoid exposing it to the user.
+	// This is mostly needed for error output, but it is also needed e.g. for
+	// the JSON IR, which includes source paths.
+	res.Content = strings.ReplaceAll(res.Content, temp.path+"/", "")
+	res.Content = strings.ReplaceAll(res.Content, temp.path, "")
+	if !res.Ok {
+		res.Annotations = append(res.Annotations, parseFidlAnnotations(res.Content)...)
+	}
+	return res, nil
+}
+
+func (s *Server) handleFIDLWithTemp(r *Request, temp tempDir) (Response, error) {
+	fidl, err := temp.createFile("fidlbolt.fidl", r.Content)
+	if err != nil {
+		return internalError(err)
+	}
+
+	// Run fidlc, automatically appending the correct --files arguments and
+	// producing info annotations for the library declaration and imports.
+	fidlc := func(args ...string) Response {
+		libs, anns := s.libraryAnalyzer.analyze(fidl, r.Content)
+		fileArgs, err := libs.fidlcFileArgs()
+		if err != nil {
+			msg := fmt.Sprintf("%s:1:1: error: %s", fidl, err)
+			return Response{Ok: false, Content: msg, Annotations: anns}
+		}
+		res := s.fidlc.run(r.ctx, append(args, fileArgs...)...)
+		res.Annotations = anns
+		return res
+	}
+
+	switch r.OutputMode {
+	case C, LLCPP, HLCPP:
+		if r.Options.File == "tables" {
+			return fidlc("--tables", "/dev/stdout"), nil
+		}
+	}
+
+	switch r.OutputMode {
+	case FIDL:
+		if r.Options.Lint {
+			if res := s.fidlLint.run(r.ctx, fidl); !res.Ok {
+				return res, nil
+			}
+		}
+		return s.fidlFormat.run(r.ctx, fidl), nil
+	case JSON:
+		switch r.Options.File {
+		case "ir":
+			return fidlc("--json", "/dev/stdout"), nil
+		case "schema":
+			return s.fidlc.run(r.ctx, "--json-schema"), nil
+		case "deps":
+			libs, anns := s.libraryAnalyzer.analyze(fidl, r.Content)
+			graph, err := libs.jsonDependencyGraph()
+			if err != nil {
+				msg := fmt.Sprintf("%s:1:1: error: %s", fidl, err)
+				return Response{Ok: false, Content: msg, Annotations: anns}, nil
+			}
+			return Response{Ok: true, Content: graph, Annotations: anns}, nil
+		default:
+			return internalErrorf("invalid file: %q", r.Options.File)
+		}
+	case C:
+		return fidlc("--c-"+r.Options.File, "/dev/stdout"), nil
+	}
+
+	jsonIR := fidl + ".json"
+	fidlcRes := fidlc("--json", jsonIR)
+	if !fidlcRes.Ok {
+		return fidlcRes, nil
+	}
+	res, err := s.handleFIDLWithIR(r, temp, jsonIR)
+	if err != nil {
+		return internalError(err)
+	}
+	res.Annotations = append(res.Annotations, fidlcRes.Annotations...)
+	return res, nil
+}
+
+func (s *Server) handleFIDLWithIR(r *Request, temp tempDir, jsonIR string) (Response, error) {
+	switch r.OutputMode {
+	case HLCPP:
+		if res := s.fidlgenHlcpp.run(r.ctx,
+			"-generators", "cpp",
+			"-json", jsonIR,
+			"-include-base", temp.path,
+			"-output-base", temp.join("impl"),
+		); !res.Ok {
+			return res, nil
+		}
+		switch r.Options.File {
+		case "header":
+			return temp.readFile("impl.h")
+		case "source":
+			return temp.readFile("impl.cc")
+		default:
+			return internalErrorf("invalid file: %q", r.Options.File)
+		}
+	case LLCPP:
+		if res := s.fidlgenLlcpp.run(r.ctx,
+			"-json", jsonIR,
+			"-header", temp.join("impl.h"),
+			"-source", temp.join("impl.cc"),
+		); !res.Ok {
+			return res, nil
+		}
+		switch r.Options.File {
+		case "header":
+			return temp.readFile("impl.h")
+		case "source":
+			return temp.readFile("impl.cc")
+		default:
+			return internalErrorf("invalid file: %q", r.Options.File)
+		}
+	case Rust:
+		if res := s.fidlgenRust.run(r.ctx,
+			"-json", jsonIR,
+			"-output-filename", temp.join("impl.rs"),
+		); !res.Ok {
+			return res, nil
+		}
+		return temp.readFile("impl.rs")
+	case Go:
+		if res := s.fidlgenGo.run(r.ctx,
+			"-json", jsonIR,
+			"-output-impl", temp.join("impl.go"),
+		); !res.Ok {
+			return res, nil
+		}
+		return temp.readFile("impl.go")
+	case Dart:
+		var name string
+		switch r.Options.File {
+		case "library":
+			name = "async"
+		case "test":
+			name = "test"
+		default:
+			return internalErrorf("invalid file: %q", r.Options.File)
+		}
+		if res := s.fidlgenDart.run(r.ctx,
+			"-json", jsonIR,
+			"-output-"+name, temp.join("impl.dart"),
+		); !res.Ok {
+			return res, nil
+		}
+		return temp.readFile("impl.dart")
+	}
+	return internalErrorf("invalid output mode: %q", r.OutputMode)
+}
+
+func (s *Server) handleFIDLText(r *Request) (Response, error) {
+	return Response{Ok: false, Content: "Not implemented"}, nil
+}
+
+func (s *Server) handleBytes(r *Request) (Response, error) {
+	switch r.OutputMode {
+	case Bytes:
+		b, pos, err := parseBytes(r.Content)
+		if err != nil {
+			msg := fmt.Sprintf("%s: error: %s", pos, err)
+			ann := Annotation{
+				Line:   pos.Line,
+				Column: pos.Column,
+				Kind:   Error,
+				Text:   err.Error(),
+			}
+			return Response{Ok: false, Content: msg, Annotations: []Annotation{ann}}, nil
+		}
+		formatted, err := formatBytes(b, &r.Options)
+		if err != nil {
+			return internalError(err)
+		}
+		return Response{Ok: true, Content: formatted}, nil
+	case Diff, FIDLText, BytesPlus:
+		return Response{Ok: false, Content: "Not implemented"}, nil
+	}
+	return internalErrorf("invalid output mode: %q", r.OutputMode)
+}
+
+// internalError reports an internal server error.
+func internalError(err error) (Response, error) {
+	return Response{}, err
+}
+
+// internalErrorf is like internalError but takes fmt.Printf arguments.
+func internalErrorf(format string, a ...interface{}) (Response, error) {
+	return internalError(fmt.Errorf(format, a...))
+}
+
+// program represents an external program by its executable path.
+type program struct {
+	path string
+}
+
+// findProgram searches the directories in bin for the named program. It returns
+// an error if the program cannot be found.
+func findProgram(name string, bin []string) (program, error) {
+	for _, dir := range bin {
+		path := filepath.Join(dir, name)
+		if _, err := os.Stat(path); err == nil {
+			return program{path}, nil
+		}
+	}
+	return program{}, fmt.Errorf("cannot find program: %q", name)
+}
+
+// run runs a program with arguments and produces a response. It stops the
+// program and returns if ctx is cancelled.
+func (p program) run(ctx context.Context, arg ...string) Response {
+	// TODO: use exec.CommandContext!
+	cmd := exec.Command(p.path, arg...)
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	cmd.Stderr = &out
+	if err := cmd.Start(); err != nil {
+		msg := fmt.Sprintf("Failed to execute %s", filepath.Base(p.path))
+		return Response{Ok: false, Content: msg}
+	}
+	result := make(chan error, 1)
+	go func() {
+		result <- cmd.Wait()
+	}()
+	select {
+	case <-ctx.Done():
+		if err := cmd.Process.Kill(); err != nil {
+			log.Printf("Failed to kill process %s with pid %d", p.path, cmd.Process.Pid)
+		}
+		// The response doesn't matter, since http.TimeoutHandler will respond
+		// with 503 Service Unavailable after cancelling ctx.
+		return Response{Ok: false}
+	case err := <-result:
+		return Response{
+			Ok:      err == nil,
+			Content: out.String(),
+		}
+	}
+}
+
+// A tempDir is temporary directory.
+type tempDir struct {
+	path string
+}
+
+// newTempDir creates a new temporary directory.
+func newTempDir() (tempDir, error) {
+	path, err := ioutil.TempDir("", "fidlbolt-")
+	return tempDir{path}, err
+}
+
+// join returns a path inside the temporary directory.
+func (d tempDir) join(elem ...string) string {
+	elem = append([]string{d.path}, elem...)
+	return filepath.Join(elem...)
+}
+
+// createFile creates a file in the temporary directory, writes content to it,
+// and returns its path.
+func (d tempDir) createFile(name, content string) (string, error) {
+	f, err := os.Create(d.join(name))
+	if err != nil {
+		return "", err
+	}
+	if _, err = f.WriteString(content); err != nil {
+		return "", err
+	}
+	f.Close()
+	return f.Name(), nil
+}
+
+// readFile creates a response from a file in the temporary directory.
+func (d tempDir) readFile(name string) (Response, error) {
+	b, err := ioutil.ReadFile(d.join(name))
+	if err != nil {
+		return Response{}, err
+	}
+	return Response{Ok: true, Content: string(b)}, nil
+}
+
+var fidlAnnotationRegexp = regexp.MustCompile(
+	`(?m)^fidlbolt\.fidl:(\d+):(\d+).*?(info|error|warning):\s*(.*)$`)
+
+// parseFidlAnnotations parses a list of annotations from error output. It
+// assumes that the output refers to a file called "fidlbolt.fidl".
+func parseFidlAnnotations(output string) []Annotation {
+	matches := fidlAnnotationRegexp.FindAllStringSubmatch(output, -1)
+	var anns []Annotation
+	for _, m := range matches {
+		line, err := strconv.Atoi(m[1])
+		if err != nil {
+			continue
+		}
+		column, err := strconv.Atoi(m[2])
+		if err != nil {
+			continue
+		}
+		anns = append(anns, Annotation{
+			Line:   line,
+			Column: column,
+			Kind:   AnnotationKind(m[3]),
+			Text:   m[4],
+		})
+	}
+	return anns
+}
diff --git a/copy_support_files.sh b/copy_support_files.sh
new file mode 100755
index 0000000..8a15211
--- /dev/null
+++ b/copy_support_files.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+set -eufo pipefail
+
+die() {
+    echo "$0: $*" >&2
+    exit 1
+}
+
+if [[ -z "$FUCHSIA_DIR" ]]; then
+    die "FUCHSIA_DIR not set"
+fi
+
+build_dir_file="$FUCHSIA_DIR/.fx-build-dir"
+if ! [[ -f "$build_dir_file" ]]; then
+    die "$build_dir_file not found"
+fi
+
+build_dir="$FUCHSIA_DIR/$(< "$build_dir_file")"
+if ! [[ -d "$build_dir" ]]; then
+    die "$build_dir not found"
+fi
+
+zircon_build_dir="${build_dir%/}.zircon"
+if ! [[ -d "$zircon_build_dir" ]]; then
+    die "$zircon_build_dir not found"
+fi
+
+cd "$(dirname "$0")"
+rm -rf support/
+mkdir -p support/{bin,fidl}
+cp \
+    "$build_dir/host_x64/"{fidlc,fidlgen_{llcpp,hlcpp,rust,go,dart}} \
+    "$zircon_build_dir/tools/fidl-"{format,lint} \
+    support/bin
+find "$FUCHSIA_DIR/sdk/fidl" -mindepth 1 -maxdepth 1 -type d \
+    | xargs -I% cp -r % support/fidl/
+find "$FUCHSIA_DIR/zircon/system/fidl" -mindepth 1 -maxdepth 1 -type d \
+    | xargs -I% cp -r % support/fidl/
diff --git a/frontend/.eslintrc.json b/frontend/.eslintrc.json
new file mode 100644
index 0000000..347f051
--- /dev/null
+++ b/frontend/.eslintrc.json
@@ -0,0 +1,29 @@
+{
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
+  "plugins": [
+    "@typescript-eslint",
+    "prettier"
+  ],
+  "rules": {
+    "prettier/prettier": "error",
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/explicit-function-return-type": "off"
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  }
+}
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
new file mode 100644
index 0000000..4c2eff0
--- /dev/null
+++ b/frontend/package-lock.json
@@ -0,0 +1,7815 @@
+{
+  "name": "fidlbolt",
+  "requires": true,
+  "lockfileVersion": 1,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+      "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.8.3"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
+      "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@types/ace": {
+      "version": "0.0.42",
+      "resolved": "https://registry.npmjs.org/@types/ace/-/ace-0.0.42.tgz",
+      "integrity": "sha512-ZakacqExJnGSoz0fSFtSL1A1Df+MIqTIPBBMl1ppEU8wS5AWGx0EPQPOyiAazkyMrskI0iG16tT+K1ZmIJGGnA==",
+      "dev": true
+    },
+    "@types/eslint-visitor-keys": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
+      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
+      "dev": true
+    },
+    "@types/json-schema": {
+      "version": "7.0.4",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.4.tgz",
+      "integrity": "sha512-8+KAKzEvSUdeo+kmqnKrqgeE+LcA0tjYWFY7RPProVYwnqDjukzO+3b6dLD56rYX5TdWejnEOLJYOIeh4CXKuA==",
+      "dev": true
+    },
+    "@types/q": {
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/@types/q/-/q-1.5.2.tgz",
+      "integrity": "sha512-ce5d3q03Ex0sy4R14722Rmt6MT07Ua+k4FwDfdcToYJcMKNtRVQvJ6JCAPdAmAnbRb6CsX6aYb9m96NGod9uTw==",
+      "dev": true
+    },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "2.20.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.20.0.tgz",
+      "integrity": "sha512-cimIdVDV3MakiGJqMXw51Xci6oEDEoPkvh8ggJe2IIzcc0fYqAxOXN6Vbeanahz6dLZq64W+40iUEc9g32FLDQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "2.20.0",
+        "eslint-utils": "^1.4.3",
+        "functional-red-black-tree": "^1.0.1",
+        "regexpp": "^3.0.0",
+        "tsutils": "^3.17.1"
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "2.20.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-2.20.0.tgz",
+      "integrity": "sha512-fEBy9xYrwG9hfBLFEwGW2lKwDRTmYzH3DwTmYbT+SMycmxAoPl0eGretnBFj/s+NfYBG63w/5c3lsvqqz5mYag==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/typescript-estree": "2.20.0",
+        "eslint-scope": "^5.0.0"
+      },
+      "dependencies": {
+        "eslint-scope": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.0.0.tgz",
+          "integrity": "sha512-oYrhJW7S0bxAFDvWqzvMPRm6pcgcnWc4QnofCAqRTRfQC0JcwenzGglTtsLyIuuWFfkqDG9vz67cnttSd53djw==",
+          "dev": true,
+          "requires": {
+            "esrecurse": "^4.1.0",
+            "estraverse": "^4.1.1"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "2.20.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-2.20.0.tgz",
+      "integrity": "sha512-o8qsKaosLh2qhMZiHNtaHKTHyCHc3Triq6aMnwnWj7budm3xAY9owSZzV1uon5T9cWmJRJGzTFa90aex4m77Lw==",
+      "dev": true,
+      "requires": {
+        "@types/eslint-visitor-keys": "^1.0.0",
+        "@typescript-eslint/experimental-utils": "2.20.0",
+        "@typescript-eslint/typescript-estree": "2.20.0",
+        "eslint-visitor-keys": "^1.1.0"
+      }
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "2.20.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-2.20.0.tgz",
+      "integrity": "sha512-WlFk8QtI8pPaE7JGQGxU7nGcnk1ccKAJkhbVookv94ZcAef3m6oCE/jEDL6dGte3JcD7reKrA0o55XhBRiVT3A==",
+      "dev": true,
+      "requires": {
+        "debug": "^4.1.1",
+        "eslint-visitor-keys": "^1.1.0",
+        "glob": "^7.1.6",
+        "is-glob": "^4.0.1",
+        "lodash": "^4.17.15",
+        "semver": "^6.3.0",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
+    "@webassemblyjs/ast": {
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+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "os-locale": "^3.1.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.0"
+      }
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+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    }
+  }
+}
diff --git a/frontend/package.json b/frontend/package.json
new file mode 100644
index 0000000..63d5a8f
--- /dev/null
+++ b/frontend/package.json
@@ -0,0 +1,33 @@
+{
+  "name": "fidlbolt",
+  "main": "index.js",
+  "scripts": {
+    "dev": "webpack --mode development",
+    "watch": "webpack --mode development --watch",
+    "tc": "tsc --noEmit",
+    "lint": "eslint src/**/*.ts",
+    "fix": "eslint --fix src/**/*.ts; elm-format --yes src/elm",
+    "build": "rm -f dist/* && webpack --mode production --progress"
+  },
+  "devDependencies": {
+    "@types/ace": "0.0.42",
+    "@typescript-eslint/eslint-plugin": "^2.20.0",
+    "@typescript-eslint/parser": "^2.20.0",
+    "css-loader": "^3.4.2",
+    "elm": "^0.19.1-3",
+    "elm-format": "^0.8.2",
+    "elm-webpack-loader": "^6.0.1",
+    "eslint": "^6.8.0",
+    "eslint-plugin-prettier": "^3.1.2",
+    "html-webpack-plugin": "^4.0.0-beta.11",
+    "mini-css-extract-plugin": "^0.9.0",
+    "optimize-css-assets-webpack-plugin": "^5.0.3",
+    "prettier": "^1.19.1",
+    "terser-webpack-plugin": "^2.3.5",
+    "ts-loader": "^6.2.1",
+    "typescript": "^3.7.5",
+    "webpack": "^4.41.6",
+    "webpack-cli": "^3.3.11"
+  },
+  "dependencies": {}
+}
diff --git a/frontend/prettier.config.js b/frontend/prettier.config.js
new file mode 100644
index 0000000..101c996
--- /dev/null
+++ b/frontend/prettier.config.js
@@ -0,0 +1,5 @@
+module.exports = {
+  bracketSpacing: false,
+  singleQuote: true,
+  trailingComma: "es5"
+};
diff --git a/frontend/src/ace-modes.js b/frontend/src/ace-modes.js
new file mode 100644
index 0000000..3b743d1
--- /dev/null
+++ b/frontend/src/ace-modes.js
@@ -0,0 +1,173 @@
+ace.define('ace/mode/error', function(require, exports, module) {
+  const TextMode = require('ace/mode/text').Mode;
+  const TextHighlightRules = require('ace/mode/text_highlight_rules')
+    .TextHighlightRules;
+
+  class ErrorMode extends TextMode {
+    constructor() {
+      super();
+      this.$id = 'ace/mode/error';
+      this.HighlightRules = ErrorHighlightRules;
+    }
+  }
+
+  class ErrorHighlightRules extends TextHighlightRules {
+    constructor() {
+      super();
+      this.$rules = {
+        start: [
+          {
+            token: 'invalid',
+            regex: /^(:?(:?Server|Network) )?Error:$/,
+          },
+        ],
+      };
+    }
+  }
+
+  exports.Mode = ErrorMode;
+});
+
+ace.define('ace/mode/bytes', function(require, exports, module) {
+  const TextMode = require('ace/mode/text').Mode;
+  const TextHighlightRules = require('ace/mode/text_highlight_rules')
+    .TextHighlightRules;
+
+  class BytesMode extends TextMode {
+    constructor() {
+      super();
+      this.$id = 'ace/mode/bytes';
+      this.HighlightRules = BytesHighlightRules;
+      this.lineCommentStart = '//';
+    }
+  }
+
+  class BytesHighlightRules extends TextHighlightRules {
+    constructor() {
+      super();
+      this.$rules = {
+        start: [
+          {
+            token: 'comment',
+            regex: '//.*$',
+          },
+          {
+            token: 'string',
+            regex: /"(?:[^"\\]|\\.)*?"/,
+          },
+          {
+            token: ['text', 'variable'],
+            regex: /^(\s*)([0-9a-fA-F]+:)/,
+          },
+          {
+            token: ['constant.numeric', 'keyword.operator'],
+            regex: /((?:-)?(?:0b[01]+|0o[0-7]+|0x[0-9a-fA-F]+|[0-9]+))([ui](?:8|16|32|64))\b/,
+          },
+        ],
+      };
+    }
+  }
+
+  exports.Mode = BytesMode;
+});
+
+ace.define('ace/mode/fidl', function(require, exports, module) {
+  const TextMode = require('ace/mode/text').Mode;
+  const TextHighlightRules = require('ace/mode/text_highlight_rules')
+    .TextHighlightRules;
+  const MatchingBraceOutdent = require('ace/mode/matching_brace_outdent')
+    .MatchingBraceOutdent;
+  const CstyleBehaviour = require('ace/mode/behaviour/cstyle').CstyleBehaviour;
+  const CstyleFoldMode = require('ace/mode/folding/cstyle').FoldMode;
+
+  class FidlMode extends TextMode {
+    constructor() {
+      super();
+      this.$id = 'ace/mode/fidl';
+      this.HighlightRules = FidlHighlightRules;
+      this.$outdent = new MatchingBraceOutdent();
+      this.$behaviour = new CstyleBehaviour();
+      this.foldingRules = new CstyleFoldMode();
+      this.lineCommentStart = '//';
+    }
+
+    getNextLineIndent(state, line, tab) {
+      let indent = line.match(/^\s*/)[0];
+      const tokens = this.getTokenizer().getLineTokens(line, state).tokens;
+      if (tokens.length && tokens[tokens.length - 1].type === 'comment') {
+        return indent;
+      }
+      if (state === 'start') {
+        const match = line.match(/^.*[\{\(\[]\s*$/);
+        if (match) {
+          indent += tab;
+        }
+      }
+      return indent;
+    }
+
+    checkOutdent(state, line, input) {
+      return this.$outdent.checkOutdent(line, input);
+    }
+
+    autoOutdent(state, doc, row) {
+      this.$outdent.autoOutdent(doc, row);
+    }
+  }
+
+  class FidlHighlightRules extends TextHighlightRules {
+    constructor() {
+      super();
+      this.$rules = {
+        start: [
+          {
+            token: 'comment',
+            regex: '//.*$',
+          },
+          {
+            token: 'string',
+            regex: /"(?:[^"\\]|\\.)*?"/,
+          },
+          {
+            token: 'keyword',
+            regex: /\b(?:as|bits|compose|const|enum|library|protocol|struct|table|union|using|xunion)\b/,
+          },
+          {
+            token: 'support.type',
+            regex: /\b(?:bool|int8|int16|int32|int64|uint8|uint16|uint32|uint64|float32|float64|array|vector|string|byte|bytes)\b/,
+          },
+          {
+            token: ['text', 'keyword'],
+            regex: /(\)\s*)(error)\b/,
+          },
+          {
+            token: 'keyword.operator',
+            regex: /->|:/,
+          },
+          {
+            token: 'support.type',
+            regex: /<|>/,
+          },
+          {
+            token: 'constant.language',
+            regex: /\b(?:true|false)\b/,
+          },
+          {
+            token: 'constant.numeric',
+            regex: /\b0[xX][0-9a-fA-F]+\b/,
+          },
+          {
+            token: 'constant.numeric',
+            regex: /\b[+-]?\d+(?:(?:\.\d*)?(?:[eE][+-]?\d+)?)?\b/,
+          },
+          {
+            token: ['entity.name.function', 'text'],
+            regex: /([a-zA-Z](?:[a-zA-Z0-9_]*[a-zA-Z0-9])?)(\()/,
+          },
+        ],
+      };
+    }
+  }
+
+  exports.Mode = FidlMode;
+});
diff --git a/frontend/src/ace.ts b/frontend/src/ace.ts
new file mode 100644
index 0000000..2892313
--- /dev/null
+++ b/frontend/src/ace.ts
@@ -0,0 +1,71 @@
+import Ace = AceAjax;
+
+export type Mode = Ace.TextMode;
+
+export type Annotation = Ace.Annotation;
+
+export type Options = {
+  [name: string]: string | number | boolean | null;
+};
+
+export interface Editor extends Ace.Editor {
+  commands: CommandManager;
+}
+
+interface CommandManager extends Ace.CommandManager {
+  // Missing in the latest @types/ace.
+  removeCommand(name: string): void;
+}
+
+export interface Session extends Ace.IEditSession {
+  // An extra property used to keep track of error status.
+  fidlboltErrorSession: boolean;
+
+  selection: Selection;
+  setMode(mode: Mode | string): void;
+}
+
+interface Selection extends Ace.Selection {
+  // Missing in the latest @types/ace.
+  toJSON(): object;
+  fromJSON(json: object): void;
+}
+
+export interface SavedSession {
+  value: string;
+  selection: object;
+  scrollTop: number;
+  scrollLeft: number;
+  undoStack: object;
+}
+
+const MAX_SAVED_UNDOS = 100;
+
+export function edit(id: string): Editor {
+  return window.ace.edit(id) as Editor;
+}
+
+export function createEditSession(text: string, mode: Mode): Session {
+  return window.ace.createEditSession(text, mode) as Session;
+}
+
+export function sessionToJSON(session: Session): SavedSession {
+  const undos = (session.getUndoManager() as any).$undoStack;
+  return {
+    value: session.getValue(),
+    selection: session.selection.toJSON(),
+    scrollTop: session.getScrollTop(),
+    scrollLeft: session.getScrollLeft(),
+    undoStack: undos.slice(Math.max(undos.length - MAX_SAVED_UNDOS, 0)),
+  };
+}
+
+export function sessionFromJSON(json: SavedSession, mode: Mode): Session {
+  const session = ace.createEditSession(json.value, mode) as Session;
+  session.selection.fromJSON(json.selection);
+  session.setScrollTop(json.scrollTop);
+  session.setScrollLeft(json.scrollLeft);
+  (session.getUndoManager() as any).$undoStack = json.undoStack;
+  session.fidlboltErrorSession = false;
+  return session;
+}
diff --git a/frontend/src/editors.ts b/frontend/src/editors.ts
new file mode 100644
index 0000000..3e78edb
--- /dev/null
+++ b/frontend/src/editors.ts
@@ -0,0 +1,263 @@
+import * as ace from './ace';
+import {DEFAULT_INPUT, getAceMode, InputMode, Mode, OutputMode} from './mode';
+import {entries, values, wordWrap} from './util';
+
+// Ace editor options that only apply to the output editor.
+const OUTPUT_EDITOR_OPTIONS: ace.Options = {
+  readOnly: true,
+  // These highlights are just distracting and usually stay on the first line.
+  highlightActiveLine: false,
+  highlightGutterLine: false,
+  // For guides to be useful, we would have to infer the indentation size.
+  displayIndentGuides: false,
+};
+
+// Ace session options that only apply to output sessions that contain errors.
+const ERROR_SESSION_OPTIONS: ace.Options = {
+  // Error messages are often printed on one long line.
+  wrap: true,
+};
+
+// Number of characters to wrap text at for annotation tooltips.
+const ANNOTATION_TEXT_WRAP = 66;
+
+// The main data structure used by the Editors class.
+type SessionMap = Record<InputMode, InputRecord>;
+
+// A map from input modes to serialized input sessions. The key type is string
+// rather than InputMode because the set of input modes might have changed since
+// the user last had the session map saved to local storage.
+type SavedSessionMap = {
+  [inputMode: string]: ace.SavedSession;
+};
+
+interface InputRecord {
+  session: ace.Session;
+  // Partial because the output records are set as needed, not up front.
+  outputs: Partial<Record<OutputMode, OutputRecord>>;
+}
+
+interface OutputRecord {
+  session: ace.Session;
+  options: Options;
+  inputAnnotations: ace.Annotation[];
+}
+
+// Options sent to the server. This corresonds to the Options type in server.go.
+export type Options = {
+  [key: string]: any;
+};
+
+// An annotation received from the server. This corresponds to the Annotation
+// type in server.go, and is different from the ace.Annotation type.
+export interface Annotation {
+  line: number; // one-based
+  column: number; // one-based
+  kind: 'info' | 'warning' | 'error';
+  text: string;
+}
+
+// Editors manages state for the input and output Ace editors.
+export class Editors {
+  readonly inputEditor: ace.Editor;
+  readonly outputEditor: ace.Editor;
+  readonly editorOptions: ace.Options;
+  readonly sessionOptions: ace.Options;
+  readonly sessions: SessionMap;
+
+  constructor(sessions: SessionMap) {
+    // These HTML IDs are set in elm/Editors.elm.
+    this.inputEditor = Editors.newEditor('InputEditor');
+    this.outputEditor = Editors.newEditor('OutputEditor');
+    this.outputEditor.setOptions(OUTPUT_EDITOR_OPTIONS);
+    this.editorOptions = {};
+    this.sessionOptions = {};
+    this.sessions = sessions;
+  }
+
+  static newEditor(htmlID: string): ace.Editor {
+    const editor = ace.edit(htmlID);
+    // We have our own settings menu in the app.
+    editor.commands.removeCommand('showSettingsMenu');
+    // We use Ctrl-[ and Ctrl-] in Editors.elm to navigate editor tabs.
+    editor.commands.removeCommand('blockindent');
+    editor.commands.removeCommand('blockoutdent');
+    // For accessiblity, allow users to "escape" the editor with a keyboard
+    // shortcut that makes Tab and Shift+Tab regain their normal behavior.
+    // https://www.w3.org/TR/2009/WD-wai-aria-practices-20090224/#richtext
+    const indentCommand = editor.commands.byName.indent;
+    const outdentCommand = editor.commands.byName.outdent;
+    const setTabMode = (indent: boolean): void => {
+      if (indent) {
+        editor.commands.addCommand(indentCommand);
+        editor.commands.addCommand(outdentCommand);
+      } else {
+        editor.commands.removeCommand('indent');
+        editor.commands.removeCommand('outdent');
+      }
+    };
+    let currentTabMode = false;
+    setTabMode(currentTabMode);
+    editor.on('focus', () => {
+      setTabMode((currentTabMode = true));
+    });
+    editor.commands.addCommand({
+      name: 'toggleTabMode',
+      bindKey: {win: 'Ctrl-M', mac: 'Ctrl-M'},
+      exec: () => {
+        setTabMode((currentTabMode = !currentTabMode));
+      },
+    });
+    return editor;
+  }
+
+  newSession(mode: Mode): ace.Session {
+    const session = ace.createEditSession('', getAceMode(mode));
+    session.setOptions(this.sessionOptions);
+    return session;
+  }
+
+  toJSON(): SavedSessionMap {
+    const json: SavedSessionMap = {};
+    for (const [inputMode, {session}] of entries(this.sessions)) {
+      json[inputMode] = ace.sessionToJSON(session);
+    }
+    return json;
+  }
+
+  static fromJSON(json?: SavedSessionMap): Editors {
+    const sessions: Partial<SessionMap> = {};
+    for (const [inputMode, defaultValue] of entries(DEFAULT_INPUT)) {
+      const savedSession = json?.[inputMode];
+      // Load the saved session only if it is present and nonempty.
+      if (savedSession?.value) {
+        const session = ace.sessionFromJSON(
+          savedSession,
+          getAceMode(inputMode)
+        );
+        sessions[inputMode] = {session, outputs: {}};
+      } else {
+        const session = ace.createEditSession(
+          defaultValue,
+          getAceMode(inputMode)
+        );
+        sessions[inputMode] = {session, outputs: {}};
+      }
+    }
+    return new Editors(sessions as SessionMap);
+  }
+
+  editorsDo(editorFn: (e: ace.Editor) => void) {
+    editorFn(this.inputEditor);
+    editorFn(this.outputEditor);
+  }
+
+  sessionsDo(sessionFn: (s: ace.Session) => void) {
+    for (const {session, outputs} of values(this.sessions)) {
+      sessionFn(session);
+      for (const {session} of values(outputs)) {
+        sessionFn(session);
+      }
+    }
+  }
+
+  showSessions(inputMode: InputMode, outputMode: OutputMode) {
+    const inputRecord = this.sessions[inputMode];
+    const outputRecord =
+      inputRecord.outputs[outputMode] ??
+      (inputRecord.outputs[outputMode] = {
+        session: this.newSession(outputMode),
+        options: {},
+        inputAnnotations: [],
+      });
+    inputRecord.session.setAnnotations(outputRecord.inputAnnotations);
+    this.inputEditor.setSession(inputRecord.session);
+    this.outputEditor.setSession(outputRecord.session);
+  }
+
+  setOutput(
+    inputMode: InputMode,
+    outputMode: OutputMode,
+    content: string,
+    annotations: Annotation[],
+    errorTitle?: string
+  ) {
+    const inputRecord = this.sessions[inputMode];
+    const outputRecord = inputRecord.outputs[outputMode];
+    if (outputRecord == undefined) {
+      return;
+    }
+    const session = outputRecord.session;
+    if (errorTitle == undefined) {
+      session.setMode(getAceMode(outputMode));
+      session.setOptions(this.sessionOptions);
+      session.setValue(content);
+      session.fidlboltErrorSession = false;
+    } else {
+      session.setMode('ace/mode/error');
+      session.setOptions(ERROR_SESSION_OPTIONS);
+      session.setValue(errorTitle + ':\n\n' + content);
+      session.fidlboltErrorSession = true;
+    }
+    outputRecord.inputAnnotations = annotations.map(
+      ({line, column, kind, text}) => ({
+        // Convert one-based to zero-based.
+        row: line - 1,
+        column: column - 1,
+        type: kind,
+        text: wordWrap(text, ANNOTATION_TEXT_WRAP),
+      })
+    );
+    inputRecord.session.setAnnotations(outputRecord.inputAnnotations);
+  }
+
+  applySettings(settings: ace.Options) {
+    this.editorOptions.theme = 'ace/theme/' + settings.theme;
+    this.editorOptions.showPrintMargin =
+      (settings.printMarginColumn as number) > 0;
+    this.editorOptions.highlightGutterLine = settings.highlightActiveLine;
+    this.editorOptions.fontSize =
+      Math.max(1, settings.fontSize as number) + 'px';
+    this.sessionOptions.tabSize = Math.max(1, settings.tabSize as number);
+    this.sessionOptions.navigateWithinSoftTabs = !settings.atomicSoftTabs;
+    if (settings.keyboardHandler === 'ace') {
+      this.editorOptions.keyboardHandler = null;
+    } else {
+      this.editorOptions.keyboardHandler =
+        'ace/keyboard/' + settings.keyboardHandler;
+    }
+    for (const field of [
+      'displayIndentGuides',
+      'foldStyle',
+      'highlightActiveLine',
+      'printMarginColumn',
+      'relativeLineNumbers',
+      'scrollPastEnd',
+      'showGutter',
+      'showInvisibles',
+      'showLineNumbers',
+      'showPrintMargin',
+    ]) {
+      this.editorOptions[field] = settings[field];
+    }
+    for (const field of ['indentedSoftWrap', 'useSoftTabs', 'wrap']) {
+      this.sessionOptions[field] = settings[field];
+    }
+
+    this.inputEditor.setOptions(this.editorOptions);
+    this.outputEditor.setOptions({
+      ...this.editorOptions,
+      ...OUTPUT_EDITOR_OPTIONS,
+    });
+    this.sessionsDo(session => {
+      session.setOptions(this.sessionOptions);
+      if (session.fidlboltErrorSession) {
+        session.setOptions(ERROR_SESSION_OPTIONS);
+      }
+    });
+  }
+
+  resize() {
+    this.editorsDo(e => e.resize());
+  }
+}
diff --git a/frontend/src/elm.d.ts b/frontend/src/elm.d.ts
new file mode 100644
index 0000000..67da812
--- /dev/null
+++ b/frontend/src/elm.d.ts
@@ -0,0 +1,3 @@
+declare module '*.elm' {
+  export const Elm: any;
+}
diff --git a/frontend/src/elm/Editors.elm b/frontend/src/elm/Editors.elm
new file mode 100644
index 0000000..28e8228
--- /dev/null
+++ b/frontend/src/elm/Editors.elm
@@ -0,0 +1,434 @@
+-- Copyright 2020 The Fuchsia Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+
+
+module Editors exposing
+    ( Editor(..)
+    , Model
+    , Msg
+    , decode
+    , encode
+    , init
+    , initCmd
+    , update
+    , view
+    )
+
+{-| This module implements the input/output editors.
+
+Input and output editors are not independent. Anything to do with an output mode
+-- its active/nonactive state, its content, its options -- is always relative to
+an input mode. For example, FIDL Text -> Bytes and Bytes -> Bytes have distinct
+output state even though both are Bytes.
+
+This module does not keep track of the Ace editor state. That is done in
+JavaScript-land because it's easier there.
+
+-}
+
+import Form exposing (Form)
+import Html exposing (Html)
+import Html.Attributes as Attributes
+import Html.Events as Events
+import Json.Decode as Decode
+import Json.Encode as Encode
+import Mode exposing (Mode)
+import Ports
+
+
+
+------------- MODEL ------------------------------------------------------------
+
+
+type alias Model =
+    { activeInput : Mode
+    , inputMap : Mode.Map InputState
+    }
+
+
+type alias InputState =
+    { activeOutput : Mode
+    , outputMap : Mode.Map OutputState
+    }
+
+
+type alias OutputState =
+    { options : Options
+    }
+
+
+type alias Options =
+    Form.Model
+
+
+type alias Active =
+    { input : Mode
+    , output : Mode
+    , options : Options
+    }
+
+
+init : Model
+init =
+    let
+        input =
+            Mode.defaultInput
+
+        inputState =
+            defaultInputState input
+    in
+    { activeInput = input
+    , inputMap = Mode.singleton input inputState
+    }
+
+
+initCmd : Model -> Cmd msg
+initCmd model =
+    updateEditors (getActive model)
+
+
+defaultInputState : Mode -> InputState
+defaultInputState input =
+    let
+        output =
+            Mode.defaultOutput input
+
+        outputState =
+            defaultOutputState input output
+    in
+    { activeOutput = output
+    , outputMap = Mode.singleton output outputState
+    }
+
+
+defaultOutputState : Mode -> Mode -> OutputState
+defaultOutputState input output =
+    { options = (Mode.options input output).default }
+
+
+getInputState : Mode -> Model -> InputState
+getInputState input model =
+    Maybe.withDefault
+        (defaultInputState input)
+        (Mode.get input model.inputMap)
+
+
+getOutputState : Mode -> Mode -> InputState -> OutputState
+getOutputState input output inputState =
+    Maybe.withDefault
+        (defaultOutputState input output)
+        (Mode.get output inputState.outputMap)
+
+
+getActive : Model -> Active
+getActive model =
+    let
+        input =
+            model.activeInput
+
+        inputState =
+            getInputState input model
+
+        output =
+            inputState.activeOutput
+
+        outputState =
+            getOutputState input output inputState
+
+        options =
+            outputState.options
+    in
+    Active input output options
+
+
+
+------------- UPDATE -----------------------------------------------------------
+
+
+type Msg
+    = NoOp
+    | -- Switch to this input mode. This also implies switching to a new output
+      -- mode (the one that was most recently used for that input).
+      ActivateInput Mode
+      -- Switch to this output mode, keeping the same input mode.
+    | ActivateOutput Mode
+      -- Update options for the current input/output mode combination.
+    | UpdateOptions Form.Msg
+
+
+update : Msg -> Model -> ( Model, Cmd msg )
+update msg model =
+    let
+        newModel =
+            case msg of
+                NoOp ->
+                    model
+
+                ActivateInput input ->
+                    activateInput input model
+
+                ActivateOutput output ->
+                    activateOutput output model
+
+                UpdateOptions formMsg ->
+                    updateOptions (Form.update formMsg) model
+
+        cmd =
+            case msg of
+                NoOp ->
+                    Cmd.none
+
+                _ ->
+                    updateEditors (getActive newModel)
+    in
+    ( newModel, cmd )
+
+
+activateInput : Mode -> Model -> Model
+activateInput input model =
+    let
+        inputState =
+            getInputState input model
+
+        newInputMap =
+            model.inputMap |> Mode.insert input inputState
+    in
+    { model | activeInput = input, inputMap = newInputMap }
+
+
+activateOutput : Mode -> Model -> Model
+activateOutput output model =
+    let
+        input =
+            model.activeInput
+
+        inputState =
+            getInputState input model
+
+        outputState =
+            getOutputState input output inputState
+
+        newOutputMap =
+            inputState.outputMap |> Mode.insert output outputState
+
+        newInputState =
+            { inputState | activeOutput = output, outputMap = newOutputMap }
+
+        newInputMap =
+            model.inputMap |> Mode.insert input newInputState
+    in
+    { model | inputMap = newInputMap }
+
+
+updateOptions : (Options -> Options) -> Model -> Model
+updateOptions alter model =
+    let
+        input =
+            model.activeInput
+
+        inputState =
+            getInputState input model
+
+        output =
+            inputState.activeOutput
+
+        outputState =
+            getOutputState input output inputState
+
+        newOutputState =
+            { options = alter outputState.options }
+
+        newOutputMap =
+            inputState.outputMap |> Mode.insert output newOutputState
+
+        newInputState =
+            { inputState | outputMap = newOutputMap }
+
+        newInputMap =
+            model.inputMap |> Mode.insert input newInputState
+    in
+    { model | inputMap = newInputMap }
+
+
+updateEditors : Active -> Cmd msg
+updateEditors active =
+    Ports.updateEditors
+        (Mode.encode active.input)
+        (Mode.encode active.output)
+        (Form.encode active.options)
+
+
+
+------------- VIEW -------------------------------------------------------------
+
+
+type Editor
+    = Input
+    | Output
+
+
+view : Editor -> (Msg -> msg) -> String -> Model -> Html msg
+view editor toMsg themeClass model =
+    let
+        active =
+            getActive model
+
+        { modes, activeMode, msg, id, optionsPart } =
+            case editor of
+                Input ->
+                    { modes = Mode.inputs
+                    , activeMode = active.input
+                    , msg = ActivateInput
+                    , id = "InputEditor"
+                    , optionsPart = []
+                    }
+
+                Output ->
+                    let
+                        form =
+                            (Mode.options active.input active.output).form
+                    in
+                    { modes = Mode.outputs active.input
+                    , activeMode = active.output
+                    , msg = ActivateOutput
+                    , id = "OutputEditor"
+                    , optionsPart =
+                        if Form.isEmpty form then
+                            []
+
+                        else
+                            [ optionsView form active.options toMsg ]
+                    }
+
+        navbarPart =
+            navbarView modes activeMode (toMsg << msg) themeClass
+
+        editorPart =
+            Html.div
+                [ Attributes.id id
+                , Attributes.class "editor"
+                ]
+                []
+    in
+    Html.div
+        [ Attributes.class "editor-wrapper"
+        , Events.on "keydown" (keyDownEvent editor active toMsg)
+        ]
+        (navbarPart :: editorPart :: optionsPart)
+
+
+navbarView : List Mode -> Mode -> (Mode -> msg) -> String -> Html msg
+navbarView modes activeMode msg themeClass =
+    let
+        navItem mode =
+            -- We provide keyboard shortcuts on the parent div to navigate
+            -- between modes. This replaces tab navigation, hence tabindex -1.
+            -- We need to use button tags so that they can be focused and the
+            -- parent div will receive keyboard events.
+            Html.button
+                [ Attributes.type_ "button"
+                , Attributes.tabindex -1
+                , Attributes.class "navbar-item"
+                , if mode == activeMode then
+                    Attributes.class ("navbar-item--active " ++ themeClass)
+
+                  else
+                    Events.onClick (msg mode)
+                ]
+                [ Html.text (Mode.title mode) ]
+    in
+    Html.div
+        [ Attributes.class "navbar" ]
+        (List.map navItem modes)
+
+
+optionsView : Form -> Form.Model -> (Msg -> msg) -> Html msg
+optionsView form options toMsg =
+    Html.div
+        [ Attributes.class "output-options" ]
+        [ Form.view
+            form
+            []
+            (toMsg << UpdateOptions)
+            options
+        ]
+
+
+keyDownEvent : Editor -> Active -> (Msg -> msg) -> Decode.Decoder msg
+keyDownEvent editor active toMsg =
+    let
+        ( activate, previous, next ) =
+            case editor of
+                Input ->
+                    ( ActivateInput
+                    , Mode.previousInput active.input
+                    , Mode.nextInput active.input
+                    )
+
+                Output ->
+                    ( ActivateOutput
+                    , Mode.previousOutput active.input active.output
+                    , Mode.nextOutput active.input active.output
+                    )
+
+        chooseMsg ctrl key =
+            if ctrl && key == "[" then
+                activate previous
+
+            else if ctrl && key == "]" then
+                activate next
+
+            else
+                NoOp
+    in
+    Decode.map toMsg <|
+        Decode.map2 chooseMsg
+            (Decode.field "ctrlKey" Decode.bool)
+            (Decode.field "key" Decode.string)
+
+
+
+------------- ENCODE / DECODE --------------------------------------------------
+
+
+encode : Model -> Encode.Value
+encode model =
+    Encode.object
+        [ ( "activeInput", Mode.encode model.activeInput )
+        , ( "inputMap", Mode.encodeMap encodeInputState model.inputMap )
+        ]
+
+
+encodeInputState : InputState -> Encode.Value
+encodeInputState inputState =
+    Encode.object
+        [ ( "activeOutput", Mode.encode inputState.activeOutput )
+        , ( "outputMap", Mode.encodeMap encodeOutputState inputState.outputMap )
+        ]
+
+
+encodeOutputState : OutputState -> Encode.Value
+encodeOutputState outputState =
+    Encode.object
+        [ ( "options", Form.encode outputState.options ) ]
+
+
+decode : Decode.Decoder Model
+decode =
+    Decode.map2 Model
+        (Decode.field "activeInput" Mode.decode)
+        (Decode.field "inputMap" (Mode.decodeMap decodeInputState))
+
+
+decodeInputState : Decode.Decoder InputState
+decodeInputState =
+    Decode.map2 InputState
+        (Decode.field "activeOutput" Mode.decode)
+        (Decode.field "outputMap" (Mode.decodeMap decodeOutputState))
+
+
+decodeOutputState : Decode.Decoder OutputState
+decodeOutputState =
+    Decode.map OutputState
+        (Decode.field "options" Form.decode)
diff --git a/frontend/src/elm/Form.elm b/frontend/src/elm/Form.elm
new file mode 100644
index 0000000..f245a0f
--- /dev/null
+++ b/frontend/src/elm/Form.elm
@@ -0,0 +1,539 @@
+-- Copyright 2020 The Fuchsia Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+
+
+module Form exposing
+    ( Button
+    , Definition
+    , Form
+    , Identifier
+    , Model
+    , Msg
+    , checkbox
+    , decode
+    , define
+    , encode
+    , getStringValue
+    , groupedSelect
+    , insertStringValue
+    , isEmpty
+    , number
+    , select
+    , text
+    , update
+    , view
+    )
+
+{-| This module provides abstractions for forms.
+
+There are three main types:
+
+  - Form: Declarative representation of an HTML form as a list of inputs.
+  - Model: Concrete assignment of values to each form input.
+  - Definition: Combination of a Form and a (default) Model, for convenience.
+
+The rendered form looks like this:
+
+    <form class="form">
+        <div class="form-control">
+            <label>
+                The label:
+                <input ... >
+            </label>
+            ...
+        </div>
+        ...
+    </form>
+
+There are five kind of inputs:
+
+  - Checkbox:
+    <input type="checkbox" class="form-checkbox">
+  - Text:
+    <input type="text" class="form-text">
+  - Number:
+    <input type="number" class="form-number">
+  - Select:
+    <select class="form-select"><option class="form-option"> ... </select>
+
+Forms can also have buttons at the end:
+
+    <button class="form-button"> ... </button>
+
+-}
+
+import Dict exposing (Dict)
+import Html exposing (Html)
+import Html.Attributes as Attributes
+import Html.Events as Events
+import Json.Decode as Decode
+import Json.Encode as Encode
+
+
+
+------------- FORM -------------------------------------------------------------
+
+
+type alias Form =
+    List Input
+
+
+type alias Input =
+    { id : Identifier
+    , label : String
+    , control : Control
+    }
+
+
+type alias Identifier =
+    String
+
+
+type Control
+    = Checkbox
+    | Text
+    | Number (Int -> Bool)
+    | Select OptionList
+
+
+type OptionList
+    = Flat (List Option)
+    | Grouped (List ( String, List Option ))
+
+
+type alias Option =
+    { id : Identifier
+    , label : String
+    }
+
+
+isEmpty : Form -> Bool
+isEmpty =
+    List.isEmpty
+
+
+
+------------- MODEL ------------------------------------------------------------
+
+
+type alias Model =
+    Dict Identifier Value
+
+
+type Value
+    = BoolValue Bool
+    | StringValue String
+    | ParsedIntValue ParsedInt
+
+
+type alias ParsedInt =
+    { -- The actual string input, possibly invalid.
+      string : String
+
+    -- True if the string is a valid integer.
+    , valid : Bool
+
+    -- The parsed string (if valid), or the most recent valid input otherwise.
+    , int : Int
+    }
+
+
+init : List ( Identifier, Value ) -> Model
+init entries =
+    Dict.fromList entries
+
+
+getBoolValue : Identifier -> Model -> Bool
+getBoolValue id model =
+    case Dict.get id model of
+        Just (BoolValue bool) ->
+            bool
+
+        _ ->
+            False
+
+
+getStringValue : Identifier -> Model -> String
+getStringValue id model =
+    case Dict.get id model of
+        Just (StringValue string) ->
+            string
+
+        _ ->
+            ""
+
+
+insertStringValue : Identifier -> String -> Model -> Model
+insertStringValue id string model =
+    Dict.insert id (StringValue string) model
+
+
+getParsedIntValue : Identifier -> Model -> ParsedInt
+getParsedIntValue id model =
+    case Dict.get id model of
+        Just (ParsedIntValue parsedInt) ->
+            parsedInt
+
+        _ ->
+            { string = "", valid = False, int = 0 }
+
+
+fromInt : Int -> ParsedInt
+fromInt int =
+    { string = String.fromInt int, valid = True, int = int }
+
+
+parseNewInt : (Int -> Bool) -> ParsedInt -> String -> ParsedInt
+parseNewInt validate previous string =
+    let
+        invalid =
+            { string = string, valid = False, int = previous.int }
+    in
+    case String.toInt string of
+        Just int ->
+            if validate int then
+                fromInt int
+
+            else
+                invalid
+
+        Nothing ->
+            invalid
+
+
+
+------------- DEFINITION -------------------------------------------------------
+
+
+type alias Definition =
+    { form : Form
+    , default : Model
+    }
+
+
+type alias Entry =
+    { input : Input
+    , default : Value
+    }
+
+
+{-| Defines a form with default values. This is the main entry point of this
+module. Example usage:
+
+    define
+        [ text "productId" "Product ID" ""
+        , number "quantity" "Quantity" 1
+        , checkbox "gift" "Gift" False
+        , select
+            "method"
+            "Method"
+            [ ( "slow", "Slow" ), ( "fast", "Fast" ) ]
+            "slow"
+        ]
+
+This creates a form with text, number, checkbox, and select inputs. Each helper
+function takes an identifier and a user-facing label as its first two arguments.
+The defaults in this case are an empty string, 1, False, and the "slow" option.
+
+-}
+define : List Entry -> Definition
+define entries =
+    let
+        idAndDefault entry =
+            ( entry.input.id, entry.default )
+    in
+    { form = List.map .input entries
+    , default = init (List.map idAndDefault entries)
+    }
+
+
+checkbox : Identifier -> String -> Bool -> Entry
+checkbox =
+    makeEntry Checkbox BoolValue
+
+
+text : Identifier -> String -> String -> Entry
+text =
+    makeEntry Text StringValue
+
+
+number : Identifier -> String -> Int -> (Int -> Bool) -> Entry
+number id label default validate =
+    makeEntry (Number validate) (ParsedIntValue << fromInt) id label default
+
+
+makeEntry : Control -> (a -> Value) -> Identifier -> String -> a -> Entry
+makeEntry control valueVariant id label default =
+    { input =
+        { id = id
+        , label = label
+        , control = control
+        }
+    , default = valueVariant default
+    }
+
+
+select :
+    Identifier
+    -> String
+    -> List ( Identifier, String )
+    -> Identifier
+    -> Entry
+select id label options default =
+    let
+        convert ( optionId, optionLabel ) =
+            { id = optionId, label = optionLabel }
+    in
+    { input =
+        { id = id
+        , label = label
+        , control = Select (Flat (List.map convert options))
+        }
+    , default = StringValue default
+    }
+
+
+groupedSelect :
+    Identifier
+    -> String
+    -> List ( Identifier, List ( Identifier, String ) )
+    -> Identifier
+    -> Entry
+groupedSelect id label groupedOptions default =
+    let
+        convert ( optionId, optionLabel ) =
+            { id = optionId, label = optionLabel }
+
+        convertGroup ( groupLabel, options ) =
+            ( groupLabel, List.map convert options )
+    in
+    { input =
+        { id = id
+        , label = label
+        , control = Select (Grouped (List.map convertGroup groupedOptions))
+        }
+    , default = StringValue default
+    }
+
+
+
+------------- UPDATE -----------------------------------------------------------
+
+
+type Msg
+    = NoOp
+    | Update Identifier Value
+
+
+update : Msg -> Model -> Model
+update msg model =
+    case msg of
+        NoOp ->
+            model
+
+        Update id value ->
+            Dict.insert id value model
+
+
+
+------------- VIEW -------------------------------------------------------------
+
+
+type alias Button msg =
+    ( String, msg )
+
+
+{-| Renders the form. Example usage:
+
+    type alias MyMsg = FormMsg Form.Msg | DoSomething
+
+    view form [ ( "Do Something", DoSomething ) ] FormMsg model
+
+This renders a form with a button that performs DoSomething. There is no
+onSubmit handler: instead, handle every field update immediately by intercepting
+the Form.Update message.
+
+-}
+view : Form -> List (Button msg) -> (Msg -> msg) -> Model -> Html msg
+view form buttons toMsg model =
+    let
+        inputViews =
+            List.map (inputView toMsg model) form
+
+        buttonViews =
+            List.map buttonView buttons
+
+        buttonPart =
+            case buttonViews of
+                [] ->
+                    []
+
+                views ->
+                    [ Html.div
+                        [ Attributes.class "form-button-group" ]
+                        views
+                    ]
+    in
+    Html.form
+        [ Attributes.class "form"
+
+        -- Use an explicit onSubmit just to get the preventDefault behavior,
+        -- stopping the browser from reloading with a query when you submit.
+        , Events.onSubmit (toMsg NoOp)
+        ]
+        (inputViews ++ buttonPart)
+
+
+inputView : (Msg -> msg) -> Model -> Input -> Html msg
+inputView toMsg model input =
+    let
+        set variant value =
+            toMsg (Update input.id (variant value))
+
+        content =
+            case input.control of
+                Checkbox ->
+                    let
+                        checked =
+                            getBoolValue input.id model
+                    in
+                    [ Html.input
+                        [ Attributes.type_ "checkbox"
+                        , Attributes.checked checked
+                        , Attributes.class "form-checkbox"
+
+                        -- Explicitly toggle the model value instead of using
+                        -- the event parameter because of this bug:
+                        -- https://github.com/elm/html/issues/188
+                        , Events.onCheck (\_ -> set BoolValue (not checked))
+                        ]
+                        []
+                    ]
+
+                Text ->
+                    [ Html.input
+                        [ Attributes.type_ "text"
+                        , Attributes.value (getStringValue input.id model)
+                        , Attributes.class "form-text"
+                        , Events.onInput (set StringValue)
+                        ]
+                        []
+                    ]
+
+                Number validate ->
+                    let
+                        parsedInt =
+                            getParsedIntValue input.id model
+
+                        parse =
+                            parseNewInt validate parsedInt
+                    in
+                    [ Html.input
+                        [ Attributes.type_ "number"
+                        , Attributes.value parsedInt.string
+                        , Attributes.classList
+                            [ ( "form-number", True )
+                            , ( "form-number--invalid", not parsedInt.valid )
+                            ]
+                        , Events.onInput
+                            (set (ParsedIntValue << parse))
+                        ]
+                        []
+                    ]
+
+                Select options ->
+                    let
+                        chosenId =
+                            getStringValue input.id model
+
+                        optionView option =
+                            Html.option
+                                [ Attributes.value option.id
+                                , Attributes.selected (option.id == chosenId)
+                                ]
+                                [ Html.text option.label ]
+
+                        groupView ( groupLabel, groupOptions ) =
+                            Html.optgroup
+                                [ Attributes.attribute "label" groupLabel ]
+                                (List.map optionView groupOptions)
+                    in
+                    [ Html.select
+                        [ Attributes.class "form-select"
+                        , Events.onInput (set StringValue)
+                        ]
+                        (case options of
+                            Flat list ->
+                                List.map optionView list
+
+                            Grouped groups ->
+                                List.map groupView groups
+                        )
+                    ]
+    in
+    Html.div
+        [ Attributes.class "form-control" ]
+        [ case input.control of
+            Checkbox ->
+                Html.label [] (content ++ [ Html.text input.label ])
+
+            _ ->
+                Html.label [] (Html.text input.label :: content)
+        ]
+
+
+buttonView : Button msg -> Html msg
+buttonView ( title, msg ) =
+    -- It's important to use <button type="button"> because the default button
+    -- type is "submit" and submitting the form runs that button's onclick
+    -- handler, which we don't want.
+    Html.button
+        [ Attributes.type_ "button"
+        , Attributes.class "form-button"
+        , Events.custom "click"
+            (Decode.succeed
+                { message = msg
+                , stopPropagation = True
+                , preventDefault = True
+                }
+            )
+        ]
+        [ Html.text title ]
+
+
+
+------------- ENCODE / DECODE --------------------------------------------------
+
+
+encode : Model -> Encode.Value
+encode model =
+    Encode.dict identity encodeValue model
+
+
+encodeValue : Value -> Encode.Value
+encodeValue value =
+    case value of
+        BoolValue bool ->
+            Encode.bool bool
+
+        StringValue string ->
+            Encode.string string
+
+        ParsedIntValue parsedInt ->
+            Encode.int parsedInt.int
+
+
+decode : Decode.Decoder Model
+decode =
+    Decode.dict decodeValue
+
+
+decodeValue : Decode.Decoder Value
+decodeValue =
+    Decode.oneOf
+        [ Decode.map BoolValue Decode.bool
+        , Decode.map StringValue Decode.string
+        , Decode.map (ParsedIntValue << fromInt) Decode.int
+        , Decode.fail "Invalid value type"
+        ]
diff --git a/frontend/src/elm/Main.elm b/frontend/src/elm/Main.elm
new file mode 100644
index 0000000..7b739cb
--- /dev/null
+++ b/frontend/src/elm/Main.elm
@@ -0,0 +1,454 @@
+-- Copyright 2020 The Fuchsia Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+
+
+module Main exposing (main)
+
+{-| Frontend SPA for fidlbolt.
+-}
+
+import Browser
+import Editors
+import Html exposing (Html)
+import Html.Attributes as Attributes
+import Html.Events as Events
+import Html.Lazy as Lazy
+import Json.Decode as Decode
+import Json.Encode as Encode
+import Ports
+import Settings
+import SplitPane
+import Window
+
+
+
+------------- MAIN -------------------------------------------------------------
+
+
+main : Program Decode.Value Model Msg
+main =
+    Browser.element
+        { init = init
+        , update = update
+        , subscriptions = subscriptions
+        , view = view
+        }
+
+
+
+------------- MODEL ------------------------------------------------------------
+
+
+type alias Model =
+    { editors : Editors.Model
+    , settings : Settings.Model
+    , split : SplitPane.Model
+    , window : Window.Model Window
+    }
+
+
+type alias Flags =
+    { model : Maybe Model
+    , preferredScheme : Settings.Scheme
+    }
+
+
+type Window
+    = HelpWindow
+    | SettingsWindow
+
+
+init : Decode.Value -> ( Model, Cmd Msg )
+init savedValue =
+    let
+        model =
+            case savedValue |> Decode.decodeValue decodeFlags of
+                Err _ ->
+                    defaultModel Settings.defaultScheme
+
+                Ok flags ->
+                    case flags.model of
+                        Nothing ->
+                            defaultModel flags.preferredScheme
+
+                        Just savedModel ->
+                            let
+                                newSettings =
+                                    Settings.setPreferredScheme
+                                        flags.preferredScheme
+                                        savedModel.settings
+                            in
+                            { savedModel
+                                | settings = newSettings
+                            }
+    in
+    ( model, initCmd model )
+
+
+initCmd : Model -> Cmd Msg
+initCmd model =
+    Cmd.batch
+        [ Editors.initCmd model.editors
+        , Settings.initCmd model.settings
+        ]
+
+
+defaultModel : Settings.Scheme -> Model
+defaultModel scheme =
+    { editors = Editors.init
+    , split = SplitPane.init SplitPane.Vertical 0.5 splitId
+    , settings = Settings.init scheme
+    , window = Window.init
+    }
+
+
+splitId : String
+splitId =
+    "SplitContainer"
+
+
+
+------------- UPDATE -----------------------------------------------------------
+
+
+type Msg
+    = EditorMsg Editors.Msg
+    | SettingsMsg Settings.Msg
+    | SplitMsg SplitPane.Msg
+    | WindowMsg (Window.Msg Window)
+
+
+update : Msg -> Model -> ( Model, Cmd Msg )
+update msg model =
+    case msg of
+        EditorMsg editorMsg ->
+            let
+                ( newEditors, editorCmd ) =
+                    Editors.update editorMsg model.editors
+
+                newModel =
+                    { model | editors = newEditors }
+            in
+            ( newModel
+            , Cmd.batch
+                [ editorCmd
+
+                -- Resize editors in case the options bar appeared/disappeared.
+                , Ports.resizeEditors
+                , persistModel newModel
+                ]
+            )
+
+        SettingsMsg settingsMsg ->
+            let
+                ( newSettings, settingsCmd ) =
+                    Settings.update settingsMsg model.settings
+
+                newModel =
+                    { model | settings = newSettings }
+            in
+            ( newModel
+            , Cmd.batch [ settingsCmd, persistModel newModel ]
+            )
+
+        SplitMsg splitMsg ->
+            let
+                ( newSplit, splitCmd ) =
+                    SplitPane.update splitMsg model.split
+
+                newModel =
+                    { model | split = newSplit }
+
+                cmds =
+                    [ Cmd.map SplitMsg splitCmd
+                    , case splitMsg of
+                        SplitPane.ToggleOrientation ->
+                            Cmd.batch
+                                [ Ports.resizeEditors
+                                , persistModel newModel
+                                ]
+
+                        SplitPane.DragMove _ _ ->
+                            Ports.resizeEditors
+
+                        SplitPane.DragStop _ ->
+                            Cmd.batch
+                                [ Ports.resizeEditors
+                                , persistModel newModel
+                                ]
+
+                        _ ->
+                            Cmd.none
+                    ]
+            in
+            ( newModel, Cmd.batch cmds )
+
+        WindowMsg windowMsg ->
+            let
+                newWindow =
+                    Window.update windowMsg model.window
+
+                newModel =
+                    { model | window = newWindow }
+            in
+            ( newModel
+            , Ports.setMainTabEnabled (Window.isAbsent newWindow)
+            )
+
+
+persistModel : Model -> Cmd msg
+persistModel model =
+    Ports.persistModel (encode model)
+
+
+
+------------- SUBSCRIPTIONS ----------------------------------------------------
+
+
+subscriptions : Model -> Sub Msg
+subscriptions model =
+    Sub.batch
+        [ Sub.map SplitMsg (SplitPane.subscriptions model.split)
+        , Sub.map WindowMsg (Window.subscriptions model.window)
+        ]
+
+
+
+------------- VIEW -------------------------------------------------------------
+
+
+view : Model -> Html Msg
+view model =
+    let
+        modalWindow =
+            Window.view (windowView model) WindowMsg model.window
+
+        themeClass =
+            Settings.themeClass model.settings
+
+        inputEditor =
+            Lazy.lazy2 (Editors.view Editors.Input EditorMsg)
+                themeClass
+                model.editors
+
+        outputEditor =
+            Lazy.lazy2 (Editors.view Editors.Output EditorMsg)
+                themeClass
+                model.editors
+
+        splitPane =
+            SplitPane.view inputEditor outputEditor SplitMsg model.split
+    in
+    Html.div []
+        [ modalWindow
+        , Html.div
+            [ Attributes.id "Main" ]
+            [ controlsView model
+            , Html.div
+                [ Attributes.class "wrapper" ]
+                [ headingView
+                , Html.div
+                    [ Attributes.class "container" ]
+                    [ splitPane ]
+                ]
+            ]
+        ]
+
+
+windowView : Model -> Window -> Html Msg
+windowView model window =
+    case window of
+        HelpWindow ->
+            Html.div []
+                [ Html.h2 [] [ Html.text "Help" ]
+                , helpMessage model.split.orientation
+                ]
+
+        SettingsWindow ->
+            Html.div []
+                [ Html.h2 [] [ Html.text "Settings" ]
+                , Settings.view SettingsMsg model.settings
+                ]
+
+
+headingView : Html Msg
+headingView =
+    Html.div
+        [ Attributes.class "heading" ]
+        [ Html.h1 []
+            [ Html.text "🎻"
+            , Html.span [ Attributes.class "heading-fidl" ] [ Html.text "fidl" ]
+            , Html.span [ Attributes.class "heading-bolt" ] [ Html.text "bolt" ]
+            , Html.text "⚡️"
+            ]
+        ]
+
+
+controlsView : Model -> Html Msg
+controlsView model =
+    let
+        button title msg =
+            Html.button
+                [ Attributes.class "controls-button"
+                , Attributes.type_ "button"
+                , Events.onClick msg
+                ]
+                [ Html.text title ]
+
+        toggle window =
+            if Window.isAbsent model.window then
+                WindowMsg (Window.Show window)
+
+            else
+                WindowMsg Window.Hide
+    in
+    Html.div
+        [ Attributes.class "controls-container" ]
+        [ button "Help" (toggle HelpWindow)
+        , button "Settings" (toggle SettingsWindow)
+        , button "Layout" (SplitMsg SplitPane.ToggleOrientation)
+        ]
+
+
+helpMessage : SplitPane.Orientation -> Html msg
+helpMessage orientation =
+    let
+        text =
+            Html.text
+
+        multiline =
+            Html.text << String.trim
+
+        bold content =
+            Html.b [] [ text content ]
+
+        kbd keys =
+            Html.span
+                [ Attributes.class "kbd-group" ]
+                (List.map (\key -> Html.kbd [] [ text key ]) keys)
+
+        ( inputLocation, outputLocation ) =
+            case orientation of
+                SplitPane.Horizontal ->
+                    ( "on top", "below" )
+
+                SplitPane.Vertical ->
+                    ( "on the left", "on the right" )
+    in
+    Html.div []
+        [ Html.p []
+            [ text "Welcome to "
+            , bold "fidlbolt"
+            , text ", a web app for exploring FIDL code and bytes."
+            ]
+        , Html.p []
+            [ text "Here are some tips to help you get started:" ]
+        , Html.ul []
+            [ Html.li []
+                [ text "The "
+                , bold "input"
+                , text (" editor is " ++ inputLocation ++ ". ")
+                , text "Use the tab bar, or "
+                , kbd [ "Ctrl", "[" ]
+                , text " and "
+                , kbd [ "Ctrl", "]" ]
+                , multiline """
+, to choose what kind of input you have. Then, type away in the editor.
+"""
+                ]
+            , Html.li []
+                [ text "The "
+                , bold "output"
+                , text (" view is " ++ outputLocation ++ ". ")
+                , multiline """
+Use the tab bar to choose what kind of output you want. For example, from FIDL
+input you can convert to FIDL (which just formats it), or to HLCPP to generate
+C++ bindings. Some outputs also have options along the bottom.
+"""
+                ]
+            , Html.li []
+                [ text "To "
+                , bold "refresh"
+                , text " the output, press "
+                , kbd [ "Ctrl", "Enter" ]
+                , text " or (on macOS) "
+                , kbd [ "Cmd", "Enter" ]
+                , text ". "
+                , multiline """
+Alternatively, just wait a few moments — the output will automatically refresh
+after you stop typing.
+"""
+                ]
+            , Html.li []
+                [ text "Click the "
+                , bold "Settings"
+                , text " "
+                , multiline """
+button to configure things. For example, you can try out different color themes,
+or use keybindings from your favorite editor.
+"""
+                ]
+            , Html.li []
+                [ text "Click the "
+                , bold "Layout"
+                , text " "
+                , multiline """
+button to switch between the left/right editor layout and the top/bottom one
+(useful for long lines and narrow windows).
+"""
+                ]
+            , Html.li []
+                [ text "The app "
+                , bold "autosaves"
+                , text " "
+                , multiline """
+everything to your browser’s local storage. You can always start fresh by
+clicking “Reset all data” in Settings.
+"""
+                ]
+            ]
+        , Html.li []
+            [ text "To "
+            , bold "close"
+            , text " this help window, press "
+            , kbd [ "Esc" ]
+            , text " or "
+            , kbd [ "Enter" ]
+            , text "."
+            ]
+        , Html.p []
+            [ multiline """
+Enjoy! If you find a bug, please report it to mkember@google.com.
+"""
+            ]
+        ]
+
+
+
+------------- ENCODE / DECODE --------------------------------------------------
+
+
+encode : Model -> Encode.Value
+encode model =
+    Encode.object
+        [ ( "editors", Editors.encode model.editors )
+        , ( "settings", Settings.encode model.settings )
+        , ( "split", SplitPane.encode model.split )
+        ]
+
+
+decode : Decode.Decoder Model
+decode =
+    Decode.map4 Model
+        (Decode.field "editors" Editors.decode)
+        (Decode.field "settings" Settings.decode)
+        (Decode.field "split" (SplitPane.decode splitId))
+        (Decode.succeed Window.init)
+
+
+decodeFlags : Decode.Decoder Flags
+decodeFlags =
+    Decode.map2 Flags
+        (Decode.field "model" (Decode.maybe decode))
+        (Decode.field "preferredScheme" Settings.decodeScheme)
diff --git a/frontend/src/elm/Mode.elm b/frontend/src/elm/Mode.elm
new file mode 100644
index 0000000..8ce8505
--- /dev/null
+++ b/frontend/src/elm/Mode.elm
@@ -0,0 +1,412 @@
+-- Copyright 2020 The Fuchsia Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+
+
+module Mode exposing
+    ( Map
+    , Mode(..)
+    , decode
+    , decodeMap
+    , defaultInput
+    , defaultOutput
+    , empty
+    , encode
+    , encodeMap
+    , get
+    , inputs
+    , insert
+    , nextInput
+    , nextOutput
+    , options
+    , outputs
+    , previousInput
+    , previousOutput
+    , singleton
+    , title
+    )
+
+{-| This module defines the Mode type.
+
+A mode is a format supported by fidlbolt. Some of them, like Fidl and Go,
+directly correspond to file types. Others, like BytesPlus and Diff, are more
+like abstract parsers/targets.
+
+In fidlbolt, the user selects an input and output mode. Only some input modes
+are allowed, and for a given input mode only a some output modes are allowed.
+The core functionality of the app is implemented in a set of input-output
+transformations. For example, (Fidl, Json) compiles a FIDL file with fidlc;
+(Bytes, FidlText) attemps to decode bytes (represented in hex) to FIDL Text.
+
+-}
+
+import Dict exposing (Dict)
+import Form
+import Json.Decode as Decode
+import Json.Encode as Encode
+
+
+
+------------- MODE -------------------------------------------------------------
+
+
+type Mode
+    = Bytes
+    | BytesPlus
+    | C
+    | Dart
+    | Diff
+    | Fidl
+    | FidlText
+    | Go
+    | Hlcpp
+    | Json
+    | Llcpp
+    | Rust
+
+
+inputs : List Mode
+inputs =
+    [ Fidl, FidlText, Bytes ]
+
+
+outputs : Mode -> List Mode
+outputs input =
+    case input of
+        Fidl ->
+            [ Fidl, Json, C, Llcpp, Hlcpp, Rust, Go, Dart ]
+
+        FidlText ->
+            [ FidlText, Bytes, BytesPlus ]
+
+        Bytes ->
+            [ Bytes, Diff, FidlText, BytesPlus ]
+
+        _ ->
+            []
+
+
+defaultInput : Mode
+defaultInput =
+    Fidl
+
+
+defaultOutput : Mode -> Mode
+defaultOutput input =
+    case input of
+        Fidl ->
+            Json
+
+        FidlText ->
+            Bytes
+
+        Bytes ->
+            Bytes
+
+        _ ->
+            input
+
+
+nextInput : Mode -> Mode
+nextInput input =
+    Maybe.withDefault input (getNext input inputs)
+
+
+previousInput : Mode -> Mode
+previousInput input =
+    Maybe.withDefault input (getPrevious input inputs)
+
+
+nextOutput : Mode -> Mode -> Mode
+nextOutput input output =
+    Maybe.withDefault output (getNext output (outputs input))
+
+
+previousOutput : Mode -> Mode -> Mode
+previousOutput input output =
+    Maybe.withDefault output (getPrevious output (outputs input))
+
+
+getNext : a -> List a -> Maybe a
+getNext item list =
+    let
+        rec restOfList =
+            case restOfList of
+                [] ->
+                    Nothing
+
+                [ last ] ->
+                    if last == item then
+                        List.head list
+
+                    else
+                        Nothing
+
+                first :: second :: rest ->
+                    if first == item then
+                        Just second
+
+                    else
+                        rec (second :: rest)
+    in
+    rec list
+
+
+getPrevious : a -> List a -> Maybe a
+getPrevious item list =
+    getNext item (List.reverse list)
+
+
+{-| Returns a form containing options for the given input-output transformation.
+These get passed along to the server and affect its response.
+-}
+options : Mode -> Mode -> Form.Definition
+options input output =
+    let
+        files default others =
+            Form.select "file" "File" (default :: others) (Tuple.first default)
+
+        entries =
+            case ( input, output ) of
+                ( Fidl, Fidl ) ->
+                    [ Form.checkbox "lint" "Lint" False ]
+
+                ( Fidl, Json ) ->
+                    [ files ( "ir", "Library IR" )
+                        [ ( "schema", "Schema" )
+                        , ( "deps", "Dependencies" )
+                        ]
+                    ]
+
+                ( Fidl, Hlcpp ) ->
+                    [ files ( "header", "Header" )
+                        [ ( "source", "Source" )
+                        , ( "tables", "Tables" )
+                        ]
+                    ]
+
+                ( Fidl, Llcpp ) ->
+                    [ files ( "header", "Header" )
+                        [ ( "source", "Source" )
+                        , ( "tables", "Tables" )
+                        ]
+                    ]
+
+                ( Fidl, C ) ->
+                    [ files ( "header", "Header" )
+                        [ ( "client", "Client" )
+                        , ( "server", "Server" )
+                        , ( "tables", "Tables" )
+                        ]
+                    ]
+
+                ( Fidl, Dart ) ->
+                    [ files ( "library", "Library" ) [ ( "test", "Test" ) ] ]
+
+                ( _, Bytes ) ->
+                    [ Form.number "columns" "Columns" 8 (\n -> n > 0)
+                    , Form.number "group" "Grouping" 2 (\n -> n > 0)
+                    , Form.checkbox "offsets" "Line offsets" True
+                    , Form.checkbox "capital" "Capital hex" False
+                    , Form.checkbox "ascii" "ASCII" False
+                    ]
+
+                ( Bytes, Diff ) ->
+                    [ Form.text "separator" "Separator" ";"
+                    ]
+
+                _ ->
+                    []
+    in
+    Form.define entries
+
+
+
+------------- MAP --------------------------------------------------------------
+
+
+{-| A mapping from modes to a. The key type is String rather than Mode because
+non-String keys don't work well in Elm (they aren't comparable).
+-}
+type alias Map a =
+    Dict String a
+
+
+empty : Map a
+empty =
+    Dict.empty
+
+
+singleton : Mode -> a -> Map a
+singleton mode value =
+    Dict.singleton (toString mode) value
+
+
+get : Mode -> Map a -> Maybe a
+get mode =
+    Dict.get (toString mode)
+
+
+insert : Mode -> a -> Map a -> Map a
+insert mode value map =
+    Dict.insert (toString mode) value map
+
+
+
+------------- ENCODE / DECODE --------------------------------------------------
+
+
+encode : Mode -> Encode.Value
+encode mode =
+    Encode.string (toString mode)
+
+
+decode : Decode.Decoder Mode
+decode =
+    Decode.andThen
+        (\string ->
+            case fromString string of
+                Just mode ->
+                    Decode.succeed mode
+
+                Nothing ->
+                    Decode.fail ("Invalid mode: " ++ string)
+        )
+        Decode.string
+
+
+encodeMap : (a -> Encode.Value) -> Map a -> Encode.Value
+encodeMap encoder map =
+    Encode.dict identity encoder map
+
+
+decodeMap : Decode.Decoder a -> Decode.Decoder (Map a)
+decodeMap decoder =
+    Decode.dict decoder
+
+
+
+------------- STRING FUNCTIONS -------------------------------------------------
+
+
+toString : Mode -> String
+toString mode =
+    case mode of
+        Bytes ->
+            "bytes"
+
+        BytesPlus ->
+            "bytes+"
+
+        C ->
+            "c"
+
+        Dart ->
+            "dart"
+
+        Diff ->
+            "diff"
+
+        Fidl ->
+            "fidl"
+
+        FidlText ->
+            "fidltext"
+
+        Go ->
+            "go"
+
+        Hlcpp ->
+            "hlcpp"
+
+        Json ->
+            "json"
+
+        Llcpp ->
+            "llcpp"
+
+        Rust ->
+            "rust"
+
+
+fromString : String -> Maybe Mode
+fromString string =
+    case string of
+        "bytes" ->
+            Just Bytes
+
+        "bytes+" ->
+            Just BytesPlus
+
+        "c" ->
+            Just C
+
+        "dart" ->
+            Just Dart
+
+        "diff" ->
+            Just Diff
+
+        "fidl" ->
+            Just Fidl
+
+        "fidltext" ->
+            Just FidlText
+
+        "go" ->
+            Just Go
+
+        "hlcpp" ->
+            Just Hlcpp
+
+        "json" ->
+            Just Json
+
+        "llcpp" ->
+            Just Llcpp
+
+        "rust" ->
+            Just Rust
+
+        _ ->
+            Nothing
+
+
+title : Mode -> String
+title mode =
+    case mode of
+        Bytes ->
+            "Bytes"
+
+        BytesPlus ->
+            "Bytes+"
+
+        C ->
+            "C"
+
+        Dart ->
+            "Dart"
+
+        Diff ->
+            "Diff"
+
+        Fidl ->
+            "FIDL"
+
+        FidlText ->
+            "FIDL Text"
+
+        Go ->
+            "Go"
+
+        Hlcpp ->
+            "HLCPP"
+
+        Json ->
+            "JSON"
+
+        Llcpp ->
+            "LLCPP"
+
+        Rust ->
+            "Rust"
diff --git a/frontend/src/elm/Ports.elm b/frontend/src/elm/Ports.elm
new file mode 100644
index 0000000..702d0d1
--- /dev/null
+++ b/frontend/src/elm/Ports.elm
@@ -0,0 +1,67 @@
+-- Copyright 2020 The Fuchsia Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+
+
+port module Ports exposing
+    ( applySettings
+    , clearDataAndReload
+    , persistModel
+    , resizeEditors
+    , setMainTabEnabled
+    , updateEditors
+    )
+
+{-| This module defines ports for communicating with JavaScript.
+-}
+
+import Json.Encode as Encode
+
+
+{-| Sends a value to JavaScript. This is the only port.
+-}
+port out : Encode.Value -> Cmd msg
+
+
+command : String -> Encode.Value -> Cmd msg
+command cmd value =
+    out <|
+        Encode.object
+            [ ( "command", Encode.string cmd )
+            , ( "payload", value )
+            ]
+
+
+persistModel : Encode.Value -> Cmd msg
+persistModel model =
+    command "persistModel" model
+
+
+clearDataAndReload : Cmd msg
+clearDataAndReload =
+    command "clearDataAndReload" Encode.null
+
+
+applySettings : Encode.Value -> Cmd msg
+applySettings settings =
+    command "applySettings" settings
+
+
+setMainTabEnabled : Bool -> Cmd msg
+setMainTabEnabled enabled =
+    command "setMainTabEnabled" (Encode.bool enabled)
+
+
+updateEditors : Encode.Value -> Encode.Value -> Encode.Value -> Cmd msg
+updateEditors inputMode outputMode options =
+    command "updateEditors" <|
+        Encode.object
+            [ ( "input", inputMode )
+            , ( "output", outputMode )
+            , ( "options", options )
+            ]
+
+
+resizeEditors : Cmd msg
+resizeEditors =
+    command "resizeEditors" Encode.null
diff --git a/frontend/src/elm/Settings.elm b/frontend/src/elm/Settings.elm
new file mode 100644
index 0000000..b3eabd7
--- /dev/null
+++ b/frontend/src/elm/Settings.elm
@@ -0,0 +1,377 @@
+-- Copyright 2020 The Fuchsia Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+
+
+module Settings exposing
+    ( Model
+    , Msg
+    , Scheme
+    , decode
+    , decodeScheme
+    , defaultScheme
+    , encode
+    , init
+    , initCmd
+    , setPreferredScheme
+    , themeClass
+    , update
+    , view
+    )
+
+{-| This module defines a settings form.
+-}
+
+import Dict exposing (Dict)
+import Form
+import Html exposing (Html)
+import Json.Decode as Decode
+import Json.Encode as Encode
+import Ports
+import Set exposing (Set)
+
+
+
+------------- MODEL ------------------------------------------------------------
+
+
+type alias Model =
+    Form.Model
+
+
+type Scheme
+    = Light
+    | Dark
+
+
+init : Scheme -> Model
+init preferredScheme =
+    form.default
+        |> setPreferredScheme preferredScheme
+        |> Form.insertStringValue "theme" (defaultTheme preferredScheme)
+
+
+initCmd : Model -> Cmd msg
+initCmd model =
+    applySettings model
+
+
+setPreferredScheme : Scheme -> Model -> Model
+setPreferredScheme scheme model =
+    Form.insertStringValue "preferredScheme"
+        (schemeToString scheme)
+        model
+
+
+defaultScheme : Scheme
+defaultScheme =
+    Light
+
+
+defaultTheme : Scheme -> String
+defaultTheme scheme =
+    case scheme of
+        Light ->
+            "textmate"
+
+        Dark ->
+            "tomorrow_night"
+
+
+getScheme : String -> Scheme
+getScheme theme =
+    if Set.member theme lightThemes then
+        Light
+
+    else
+        Dark
+
+
+themeClass : Model -> String
+themeClass model =
+    case Dict.get (Form.getStringValue "theme" model) themeClassSuffixes of
+        Just class ->
+            "ace-" ++ class
+
+        Nothing ->
+            ""
+
+
+form : Form.Definition
+form =
+    Form.define
+        [ Form.groupedSelect "theme" "Theme" themes "textmate"
+        , Form.select "keyboardHandler" "Keybindings" keybindings "ace"
+        , Form.number "refreshDelay" "Refresh delay (ms)" 500 (\n -> n > 0)
+        , Form.number "fontSize" "Font size" 14 (\n -> n > 0)
+        , Form.checkbox "wrap" "Wrap lines" False
+        , Form.checkbox "indentedSoftWrap" "Indent wrapped lines" False
+        , Form.number "tabSize" "Tab width" 4 (\n -> n > 0)
+        , Form.checkbox "useSoftTabs" "Soft tabs" True
+        , Form.checkbox "atomicSoftTabs" "Atomic soft tabs" True
+        , Form.checkbox "showGutter" "Show gutter" True
+        , Form.checkbox "showLineNumbers" "Line numbers" True
+        , Form.checkbox "relativeLineNumbers" "Relative line numbers" False
+        , Form.checkbox "highlightActiveLine" "Highlight active line" True
+        , Form.checkbox "scrollPastEnd" "Scroll past end" False
+        , Form.select "foldStyle" "Fold markers" foldStyles "markbegin"
+        , Form.checkbox "displayIndentGuides" "Show indent guides" True
+        , Form.checkbox "showInvisibles" "Show invisibles" False
+        , Form.checkbox "showPrintMargin" "Show margin" False
+        , Form.number "printMarginColumn" "Margin column" 80 (\n -> n >= 0)
+        ]
+
+
+themes : List ( String, List ( Form.Identifier, String ) )
+themes =
+    [ ( "Light"
+      , [ ( "chrome", "Chrome" )
+        , ( "clouds", "Clouds" )
+        , ( "crimson_editor", "Crimson Editor" )
+        , ( "dawn", "Dawn" )
+        , ( "dreamweaver", "Dreamweaver" )
+        , ( "eclipse", "Eclipse" )
+        , ( "github", "GitHub" )
+        , ( "iplastic", "iPlastic" )
+        , ( "katzenmilch", "KatzenMilch" )
+        , ( "kuroir", "Kuroir" )
+        , ( "solarized_light", "Solarized Light" )
+        , ( "sqlserver", "SQL Server" )
+        , ( "textmate", "TextMate" )
+        , ( "tomorrow", "Tomorrow" )
+        , ( "xcode", "Xcode" )
+        ]
+      )
+    , ( "Dark"
+      , [ ( "ambiance", "Ambiance" )
+        , ( "chaos", "Chaos" )
+        , ( "clouds_midnight", "Clouds Midnight" )
+        , ( "cobalt", "Cobalt" )
+        , ( "dracula", "Dracula" )
+        , ( "gob", "Gob" )
+        , ( "gruvbox", "Gruvbox" )
+        , ( "idle_fingers", "idleFingers" )
+        , ( "kr_theme", "krTheme" )
+        , ( "merbivore", "Merbivore" )
+        , ( "merbivore_soft", "Merbivore Soft" )
+        , ( "mono_industrial", "Mono Industrial" )
+        , ( "monokai", "Monokai" )
+        , ( "pastel_on_dark", "Pastel on Dark" )
+        , ( "solarized_dark", "Solarized Dark" )
+        , ( "terminal", "Terminal" )
+        , ( "tomorrow_night", "Tomorrow Night" )
+        , ( "tomorrow_night_blue", "Tomorrow Night Blue" )
+        , ( "tomorrow_night_bright", "Tomorrow Night Bright" )
+        , ( "tomorrow_night_eighties", "Tomorrow Night 80s" )
+        , ( "twilight", "Twilight" )
+        , ( "vibrant_ink", "Vibrant Ink" )
+        ]
+      )
+    ]
+
+
+lightThemes : Set Form.Identifier
+lightThemes =
+    Set.fromList
+        [ "chrome"
+        , "clouds"
+        , "crimson_editor"
+        , "dawn"
+        , "dreamweaver"
+        , "eclipse"
+        , "github"
+        , "iplastic"
+        , "katzenmilch"
+        , "kuroir"
+        , "solarized_light"
+        , "sqlserver"
+        , "textmate"
+        , "tomorrow"
+        , "xcode"
+        ]
+
+
+themeClassSuffixes : Dict Form.Identifier String
+themeClassSuffixes =
+    Dict.fromList
+        [ ( "ambiance", "ambiance" )
+        , ( "chaos", "chaos" )
+        , ( "chrome", "chrome" )
+        , ( "clouds", "clouds" )
+        , ( "clouds_midnight", "clouds-midnight" )
+        , ( "cobalt", "cobalt" )
+        , ( "crimson_editor", "crimson-editor" )
+        , ( "dawn", "dawn" )
+        , ( "dracula", "dracula" )
+        , ( "dreamweaver", "dreamweaver" )
+        , ( "eclipse", "eclipse" )
+        , ( "github", "github" )
+        , ( "gob", "gob" )
+        , ( "gruvbox", "gruvbox" )
+        , ( "idle_fingers", "idle-fingers" )
+        , ( "iplastic", "iplastic" )
+        , ( "katzenmilch", "katzenmilch" )
+        , ( "kr_theme", "kr-theme" )
+        , ( "kuroir", "kuroir" )
+        , ( "merbivore", "merbivore" )
+        , ( "merbivore_soft", "merbivore-soft" )
+        , ( "mono_industrial", "mono-industrial" )
+        , ( "monokai", "monokai" )
+        , ( "pastel_on_dark", "pastel-on-dark" )
+        , ( "solarized_dark", "solarized-dark" )
+        , ( "solarized_light", "solarized-light" )
+        , ( "sqlserver", "sqlserver" )
+        , ( "terminal", "terminal-theme" )
+        , ( "textmate", "tm" )
+        , ( "tomorrow", "tomorrow" )
+        , ( "tomorrow_night", "tomorrow-night" )
+        , ( "tomorrow_night_blue", "tomorrow-night-blue" )
+        , ( "tomorrow_night_bright", "tomorrow-night-bright" )
+        , ( "tomorrow_night_eighties", "tomorrow-night-eighties" )
+        , ( "twilight", "twilight" )
+        , ( "vibrant_ink", "vibrant-ink" )
+        , ( "xcode", "xcode" )
+        ]
+
+
+keybindings : List ( Form.Identifier, String )
+keybindings =
+    [ ( "ace", "Ace" )
+    , ( "emacs", "Emacs" )
+    , ( "sublime", "Sublime Text" )
+    , ( "vim", "Vim" )
+    , ( "vscode", "VS Code" )
+    ]
+
+
+foldStyles : List ( Form.Identifier, String )
+foldStyles =
+    [ ( "manual", "Off" )
+    , ( "markbegin", "Begin" )
+    , ( "markbeginend", "Begin and end" )
+    ]
+
+
+
+------------- UPDATE -----------------------------------------------------------
+
+
+type Msg
+    = FormMsg Form.Msg
+    | ResetForm
+    | ClearDataAndReload
+
+
+update : Msg -> Model -> ( Model, Cmd msg )
+update msg model =
+    case msg of
+        FormMsg formMsg ->
+            let
+                newModel =
+                    Form.update formMsg model
+            in
+            ( newModel
+            , applySettings newModel
+            )
+
+        ResetForm ->
+            let
+                preferredScheme =
+                    Form.getStringValue "preferredScheme" model
+                        |> schemeFromString
+                        |> Maybe.withDefault defaultScheme
+
+                newModel =
+                    init preferredScheme
+            in
+            ( newModel
+            , applySettings newModel
+            )
+
+        ClearDataAndReload ->
+            ( model, Ports.clearDataAndReload )
+
+
+applySettings : Model -> Cmd msg
+applySettings model =
+    let
+        scheme =
+            getScheme (Form.getStringValue "theme" model)
+
+        augmentedModel =
+            Form.insertStringValue "scheme"
+                (schemeToString scheme)
+                model
+    in
+    Ports.applySettings (Form.encode augmentedModel)
+
+
+
+------------- VIEW -------------------------------------------------------------
+
+
+view : (Msg -> msg) -> Model -> Html msg
+view toMsg model =
+    Form.view form.form (buttons toMsg) (toMsg << FormMsg) model
+
+
+buttons : (Msg -> msg) -> List (Form.Button msg)
+buttons toMsg =
+    [ ( "Use defaults", toMsg ResetForm )
+
+    -- Labelling it "Reset" instead of "Clear" because, while it does clear the
+    -- local storage items, they will immediately get set again to their default
+    -- values when the page reloads.
+    , ( "Reset all data", toMsg ClearDataAndReload )
+    ]
+
+
+
+------------- ENCODE / DECODE --------------------------------------------------
+
+
+encode : Model -> Encode.Value
+encode model =
+    Form.encode (Dict.remove "preferredScheme" model)
+
+
+decode : Decode.Decoder Model
+decode =
+    Form.decode
+
+
+schemeToString : Scheme -> String
+schemeToString scheme =
+    case scheme of
+        Light ->
+            "light"
+
+        Dark ->
+            "dark"
+
+
+decodeScheme : Decode.Decoder Scheme
+decodeScheme =
+    Decode.string
+        |> Decode.andThen
+            (\string ->
+                case schemeFromString string of
+                    Just scheme ->
+                        Decode.succeed scheme
+
+                    _ ->
+                        Decode.fail ("Invalid scheme: " ++ string)
+            )
+
+
+schemeFromString : String -> Maybe Scheme
+schemeFromString string =
+    case string of
+        "light" ->
+            Just Light
+
+        "dark" ->
+            Just Dark
+
+        _ ->
+            Nothing
diff --git a/frontend/src/elm/SplitPane.elm b/frontend/src/elm/SplitPane.elm
new file mode 100644
index 0000000..ec73a2b
--- /dev/null
+++ b/frontend/src/elm/SplitPane.elm
@@ -0,0 +1,420 @@
+-- Copyright 2020 The Fuchsia Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+
+
+module SplitPane exposing
+    ( Model
+    , Msg(..)
+    , Orientation(..)
+    , decode
+    , encode
+    , init
+    , subscriptions
+    , update
+    , view
+    )
+
+{-| This module provides draggable split panes.
+
+It only sets width/height styles. The client is responsible for customizing
+these CSS classes:
+
+  - .split-container, applied to the overall container div.
+  - .split-item, applied to the two panes inside the container.
+  - .split-item--first, applied only to the top/left pane.
+  - .split-item--second, applied only to the bottom/right pane.
+  - .split-splitter, applied to the splitter between the two panes.
+  - .split-{container,item,splitter}--horizontal, applied in horizontal mode.
+  - .split-{container,item,splitter}--vertical, applied in vertical mode.
+
+-}
+
+import Browser.Dom
+import Browser.Events
+import Html exposing (Html)
+import Html.Attributes as Attributes
+import Html.Events as Events
+import Json.Decode as Decode
+import Json.Encode as Encode
+import Task
+
+
+
+------------- MODEL ------------------------------------------------------------
+
+
+type alias Model =
+    { -- Current orientation of the splitter.
+      orientation : Orientation
+
+    -- Keep track of whether the split is being dragged and its position.
+    , state : State
+
+    -- HTML id to use for the container div.
+    , id : String
+
+    -- Bounds of the container div.
+    , bounds : Bounds
+    }
+
+
+{-| Orientation can be confusing. This module uses the terms to refer to the
+splitter, so Horizontal means top/bottom and Vertical means left/right.
+-}
+type Orientation
+    = Horizontal
+    | Vertical
+
+
+type State
+    = Static Position
+    | Moving Position
+
+
+{-| The position of the splitter is a fraction from 0 to 1, where 0 means
+dragged all the way to the top/left and 1 means all the way to the bottom/right.
+-}
+type alias Position =
+    Float
+
+
+type alias Bounds =
+    { x : Pixels
+    , y : Pixels
+    , width : Pixels
+    , height : Pixels
+    }
+
+
+{-| Pixels means the CSS pixel unit (not necessary the same as display pixels).
+-}
+type alias Pixels =
+    Float
+
+
+{-| Initializes a split pane. For example:
+
+    init Vertical 0.5 "SplitContainer"
+
+To use multiple split containers in a page, they must have unique IDs.
+
+-}
+init : Orientation -> Position -> String -> Model
+init orientation splitPosition id =
+    { orientation = orientation
+    , state = Static splitPosition
+    , id = id
+    , bounds = emptyBounds
+    }
+
+
+emptyBounds : Bounds
+emptyBounds =
+    { x = 0, y = 0, width = 0, height = 0 }
+
+
+position : State -> Position
+position state =
+    case state of
+        Static x ->
+            x
+
+        Moving x ->
+            x
+
+
+
+------------- UPDATE -----------------------------------------------------------
+
+
+type Msg
+    = NoOp
+      -- Toggles the orientation.
+    | ToggleOrientation
+      -- PreDragStart is necessary to kick off getting the container div bounds.
+      -- Without it, if you resize the window and then start dragging, there is
+      -- an annoying flicker effect.
+    | PreDragStart
+      -- Start dragging, providing the updated container bounds.
+    | DragStart Bounds
+      -- Continue dragging, indicating whether the mouse is still down or not.
+    | DragMove MouseState Coords
+      -- Finish dragging.
+    | DragStop Coords
+
+
+type MouseState
+    = MouseUp
+    | MouseDown
+
+
+{-| Coords represents a position relative to the top-left of the page.
+-}
+type alias Coords =
+    { pageX : Pixels
+    , pageY : Pixels
+    }
+
+
+update : Msg -> Model -> ( Model, Cmd Msg )
+update msg model =
+    case msg of
+        NoOp ->
+            ( model, Cmd.none )
+
+        ToggleOrientation ->
+            let
+                orientation =
+                    case model.orientation of
+                        Horizontal ->
+                            Vertical
+
+                        Vertical ->
+                            Horizontal
+            in
+            ( { model | orientation = orientation }, Cmd.none )
+
+        PreDragStart ->
+            ( model, startDrag model )
+
+        DragStart bounds ->
+            ( { model
+                | bounds = bounds
+                , state = Moving (position model.state)
+              }
+            , Cmd.none
+            )
+
+        DragMove mouseState coords ->
+            ( { model
+                | state =
+                    case mouseState of
+                        MouseDown ->
+                            Moving (coordsToPosition coords model)
+
+                        MouseUp ->
+                            Static (position model.state)
+              }
+            , Cmd.none
+            )
+
+        DragStop coords ->
+            ( { model
+                | state = Static (coordsToPosition coords model)
+              }
+            , Cmd.none
+            )
+
+
+startDrag : Model -> Cmd Msg
+startDrag model =
+    let
+        element =
+            Browser.Dom.getElement model.id |> Task.map .element
+
+        handle result =
+            case result of
+                Ok bounds ->
+                    DragStart bounds
+
+                Err _ ->
+                    NoOp
+    in
+    Task.attempt handle element
+
+
+coordsToPosition : Coords -> Model -> Position
+coordsToPosition coords model =
+    let
+        fraction =
+            case model.orientation of
+                Horizontal ->
+                    (coords.pageY - model.bounds.y) / model.bounds.height
+
+                Vertical ->
+                    (coords.pageX - model.bounds.x) / model.bounds.width
+    in
+    clamp 0 1 fraction
+
+
+
+------------- SUBSCRIPTIONS ----------------------------------------------------
+
+
+subscriptions : Model -> Sub Msg
+subscriptions model =
+    case model.state of
+        Static _ ->
+            Sub.none
+
+        Moving _ ->
+            Sub.batch
+                [ Browser.Events.onMouseMove
+                    (Decode.map2 DragMove decodeMouseState decodeCoords)
+                , Browser.Events.onMouseUp
+                    (Decode.map DragStop decodeCoords)
+                ]
+
+
+decodeMouseState : Decode.Decoder MouseState
+decodeMouseState =
+    Decode.field "buttons" <|
+        Decode.map
+            (\buttons ->
+                case buttons of
+                    1 ->
+                        MouseDown
+
+                    _ ->
+                        MouseUp
+            )
+            Decode.int
+
+
+decodeCoords : Decode.Decoder Coords
+decodeCoords =
+    Decode.map2 Coords
+        (Decode.field "pageX" Decode.float)
+        (Decode.field "pageY" Decode.float)
+
+
+
+------------- VIEW -------------------------------------------------------------
+
+
+{-| Creates the split pane view. The toMsg parameter converts a SplitPane.Msg to
+the top-level Msg type of the app.
+-}
+view : Html msg -> Html msg -> (Msg -> msg) -> Model -> Html msg
+view firstView secondView toMsg model =
+    let
+        orientationModifier =
+            case model.orientation of
+                Horizontal ->
+                    "horizontal"
+
+                Vertical ->
+                    "vertical"
+
+        classWithOrientation className =
+            Attributes.class
+                (className ++ " " ++ className ++ "--" ++ orientationModifier)
+
+        -- Keep the cursor in the center of the resize bar.
+        firstItemSize =
+            size model.orientation
+                ("calc("
+                    ++ String.fromFloat (position model.state * 100)
+                    ++ "% - "
+                    ++ String.fromFloat (splitterSize / 2)
+                    ++ "px)"
+                )
+
+        -- But don't let the half the bar disappear under the far edge.
+        firstItemMaxSize =
+            maxSize
+                model.orientation
+                ("calc(100% - " ++ String.fromFloat splitterSize ++ "px)")
+    in
+    Html.div
+        [ Attributes.id model.id
+        , classWithOrientation "split-container"
+        ]
+        [ Html.div
+            [ classWithOrientation "split-item"
+            , Attributes.class "split-item--first"
+            , firstItemSize
+            , firstItemMaxSize
+            ]
+            [ firstView ]
+        , Html.div
+            [ classWithOrientation "split-splitter"
+            , size model.orientation (String.fromFloat splitterSize ++ "px")
+            , Events.onMouseDown (toMsg PreDragStart)
+            ]
+            []
+        , Html.div
+            [ classWithOrientation "split-item"
+            , Attributes.class "split-item--second"
+            ]
+            [ secondView ]
+        ]
+
+
+splitterSize : Pixels
+splitterSize =
+    8
+
+
+size : Orientation -> String -> Html.Attribute msg
+size orientation value =
+    case orientation of
+        Horizontal ->
+            Attributes.style "height" value
+
+        Vertical ->
+            Attributes.style "width" value
+
+
+maxSize : Orientation -> String -> Html.Attribute msg
+maxSize orientation value =
+    case orientation of
+        Horizontal ->
+            Attributes.style "max-height" value
+
+        Vertical ->
+            Attributes.style "max-width" value
+
+
+
+------------- ENCODE / DECODE --------------------------------------------------
+
+
+{-| Encodes the model. This only includes the orientation and drag position. It
+omits the ID, bounds, and static/moving, since persisting those is not useful.
+-}
+encode : Model -> Encode.Value
+encode model =
+    Encode.object
+        [ ( "orientation", encodeOrientation model.orientation )
+        , ( "state", Encode.float (position model.state) )
+        ]
+
+
+{-| Decodes the model. You must provide the ID.
+-}
+decode : String -> Decode.Decoder Model
+decode id =
+    Decode.map4 Model
+        (Decode.field "orientation" decodeOrientation)
+        (Decode.field "state" (Decode.map Static Decode.float))
+        (Decode.succeed id)
+        (Decode.succeed emptyBounds)
+
+
+encodeOrientation : Orientation -> Encode.Value
+encodeOrientation orientation =
+    case orientation of
+        Horizontal ->
+            Encode.string "horizontal"
+
+        Vertical ->
+            Encode.string "vertical"
+
+
+decodeOrientation : Decode.Decoder Orientation
+decodeOrientation =
+    Decode.string
+        |> Decode.andThen
+            (\string ->
+                case string of
+                    "horizontal" ->
+                        Decode.succeed Horizontal
+
+                    "vertical" ->
+                        Decode.succeed Vertical
+
+                    _ ->
+                        Decode.fail ("Invalid orientation: " ++ string)
+            )
diff --git a/frontend/src/elm/Window.elm b/frontend/src/elm/Window.elm
new file mode 100644
index 0000000..a363722
--- /dev/null
+++ b/frontend/src/elm/Window.elm
@@ -0,0 +1,139 @@
+-- Copyright 2020 The Fuchsia Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style license that can be
+-- found in the LICENSE file.
+
+
+module Window exposing
+    ( Model
+    , Msg(..)
+    , init
+    , isAbsent
+    , subscriptions
+    , update
+    , view
+    )
+
+{-| This module implements modal windows.
+
+A modal window is a window placed on top of the main app content (which is
+dimmed and disabled). The user can dismiss the window by clicking anywhere
+outside it, or pressing Escape or Return.
+
+-}
+
+import Browser.Events
+import Html exposing (Html)
+import Html.Attributes as Attributes
+import Html.Events as Events
+import Json.Decode as Decode
+
+
+
+------------- MODEL ------------------------------------------------------------
+
+
+type alias Model a =
+    Maybe a
+
+
+init : Model a
+init =
+    Nothing
+
+
+isAbsent : Model a -> Bool
+isAbsent model =
+    case model of
+        Just _ ->
+            False
+
+        Nothing ->
+            True
+
+
+
+------------- UPDATE -----------------------------------------------------------
+
+
+type Msg a
+    = NoOp
+    | Show a
+    | Hide
+
+
+update : Msg a -> Model a -> Model a
+update msg model =
+    case msg of
+        NoOp ->
+            model
+
+        Show window ->
+            Just window
+
+        Hide ->
+            Nothing
+
+
+
+------------- SUBSCRIPTIONS ----------------------------------------------------
+
+
+subscriptions : Model a -> Sub (Msg a)
+subscriptions model =
+    case model of
+        Just _ ->
+            Browser.Events.onKeyDown keyDownEvent
+
+        _ ->
+            Sub.none
+
+
+keyDownEvent : Decode.Decoder (Msg a)
+keyDownEvent =
+    Decode.field "key" Decode.string
+        |> Decode.map
+            (\key ->
+                -- For the Help window, catching Enter here is redundant because
+                -- the focus will still be on the button, and pressing enter
+                -- again will click it and hide the window. But for the Settings
+                -- window it is needed since focus might be on a form input. The
+                -- toggle behavior on the button is still useful so that
+                -- spacebar hides the window when the button is still focused.
+                if key == "Enter" || key == "Escape" then
+                    Hide
+
+                else
+                    NoOp
+            )
+
+
+
+------------- VIEW -------------------------------------------------------------
+
+
+view : (a -> Html msg) -> (Msg a -> msg) -> Model a -> Html msg
+view windowView toMsg model =
+    case model of
+        Nothing ->
+            Html.text ""
+
+        Just window ->
+            Html.div
+                [ Attributes.class "modal-container"
+                , Events.onClick (toMsg Hide)
+                ]
+                [ Html.div
+                    [ Attributes.id modalBoxId
+                    , Attributes.class "modal-box"
+
+                    -- Prevent clicking the box itself from hiding it.
+                    , Events.stopPropagationOn "click"
+                        (Decode.succeed ( toMsg NoOp, True ))
+                    ]
+                    [ windowView window ]
+                ]
+
+
+modalBoxId : String
+modalBoxId =
+    "ModalBox"
diff --git a/frontend/src/elm/elm.json b/frontend/src/elm/elm.json
new file mode 100644
index 0000000..9e36cc2
--- /dev/null
+++ b/frontend/src/elm/elm.json
@@ -0,0 +1,24 @@
+{
+    "type": "application",
+    "source-directories": [
+        "."
+    ],
+    "elm-version": "0.19.1",
+    "dependencies": {
+        "direct": {
+            "elm/browser": "1.0.2",
+            "elm/core": "1.0.4",
+            "elm/html": "1.0.0",
+            "elm/json": "1.1.3"
+        },
+        "indirect": {
+            "elm/time": "1.0.0",
+            "elm/url": "1.0.0",
+            "elm/virtual-dom": "1.0.2"
+        }
+    },
+    "test-dependencies": {
+        "direct": {},
+        "indirect": {}
+    }
+}
diff --git a/frontend/src/evaluator.ts b/frontend/src/evaluator.ts
new file mode 100644
index 0000000..dae3937
--- /dev/null
+++ b/frontend/src/evaluator.ts
@@ -0,0 +1,190 @@
+import {Annotation, Editors, Options} from './editors';
+import {InputMode, OutputMode} from './mode';
+import {Timeout, withTimeout} from './util';
+
+// Timeout for POST requests to the server, in milliseconds.
+const POST_REQUEST_TIMEOUT = 15000;
+
+// Delay from unhiding the loader to starting its opacity animation, in
+// milliseconds. Too short and the CSS transition doesn't get triggered.
+const LOADER_OPACITY_1_DELAY = 20;
+
+// Delay from starting the loader fade-out transition to hiding it, in
+// milliseconds. This should be at least as long as the CSS .loader transition.
+const LOADER_DISPLAY_NONE_DELAY = 300;
+
+// A request sent to the server.
+interface Request {
+  inputMode: InputMode;
+  outputMode: OutputMode;
+  options: Options;
+  content: string;
+}
+
+// A type used to store past inputs. New inputs are checked to avoid sending
+// requests to the server when nothing has changed.
+type InputMap = Partial<
+  Record<
+    InputMode,
+    Partial<
+      Record<
+        OutputMode,
+        {
+          options: string;
+          content: string;
+        }
+      >
+    >
+  >
+>;
+
+// Evaluator sends requests to the server to update the output.
+export class Evaluator {
+  readonly editors: Editors;
+  readonly saveFn: VoidFunction;
+  readonly loaderElement: HTMLElement;
+
+  refreshDelay: number;
+  lastInput: InputMap;
+  active?: Omit<Request, 'content'>;
+  loaderTimeout?: Timeout;
+
+  constructor(editors: Editors, saveFn: VoidFunction) {
+    this.editors = editors;
+    this.saveFn = saveFn;
+    this.lastInput = {};
+    this.active = undefined;
+    this.refreshDelay = Infinity;
+    this.loaderElement = document.getElementById('Loader') as HTMLElement;
+    this.loaderTimeout = undefined;
+  }
+
+  setActive(inputMode: InputMode, outputMode: OutputMode, options: Options) {
+    this.active = {inputMode, outputMode, options};
+  }
+
+  setRefreshDelay(delay: number) {
+    this.refreshDelay = delay;
+  }
+
+  needsRefresh(request: Request) {
+    const forOutput =
+      this.lastInput[request.inputMode] ??
+      (this.lastInput[request.inputMode] = {});
+    const last = forOutput[request.outputMode];
+    if (
+      last != undefined &&
+      last.content === request.content &&
+      last.options === JSON.stringify(request.options)
+    ) {
+      return false;
+    }
+    forOutput[request.outputMode] = {
+      content: request.content,
+      options: JSON.stringify(request.options),
+    };
+    return true;
+  }
+
+  // Adds event listeners and starts the idle timeout, so that run() gets called
+  // on Ctrl+Enter or Cmd+Enter and after this.refreshDelay milliseconds after
+  // the user types something in the input editor.
+  start() {
+    let idleTimeout: Timeout;
+    window.addEventListener('unload', this.saveFn);
+    window.addEventListener(
+      'keydown',
+      event => {
+        if ((event.ctrlKey || event.metaKey) && event.key == 'Enter') {
+          clearTimeout(idleTimeout);
+          this.run();
+        }
+      },
+      // Use capturing rather than bubbling so that the Ace editor doesn't get
+      // the keydown event first.
+      true
+    );
+    window.addEventListener('blur', () => {
+      clearTimeout(idleTimeout);
+    });
+    this.editors.inputEditor.on('change', () => {
+      clearTimeout(idleTimeout);
+      idleTimeout = setTimeout(() => this.run(), this.refreshDelay);
+    });
+  }
+
+  // Sends a request to the server (if the input has changed) and updates the
+  // output, displaying a loading animation in the meantime.
+  async run() {
+    if (this.active == undefined) {
+      return;
+    }
+    const request = {
+      ...this.active,
+      content: this.editors.inputEditor.getValue(),
+    };
+    if (!this.needsRefresh(request)) {
+      return;
+    }
+
+    this.startLoadingAnimation();
+    const finish = (content: string, anns?: Annotation[], error?: string) => {
+      this.editors.setOutput(
+        request.inputMode,
+        request.outputMode,
+        content,
+        anns ?? [],
+        error
+      );
+      this.endLoadingAnimation();
+    };
+
+    this.saveFn();
+    let response;
+    try {
+      response = await withTimeout(
+        POST_REQUEST_TIMEOUT,
+        'Timed out waiting for server to respond',
+        fetch('/convert', {
+          method: 'POST',
+          headers: {'Content-Type': 'application/json'},
+          body: JSON.stringify(request),
+        })
+      );
+    } catch (error) {
+      finish(error.message, [], 'Network Error');
+      return;
+    }
+    if (response.ok) {
+      const json = await response.json();
+      finish(json.content, json.annotations, json.ok ? undefined : 'Error');
+    } else {
+      let msg;
+      if (response.headers.get('Content-Type')?.startsWith('text/plain')) {
+        msg = await response.text();
+      } else {
+        msg = `Server responded with HTTP status ${response.status}`;
+        if (response.statusText) {
+          msg += ' ' + response.statusText;
+        }
+      }
+      finish(msg, [], 'Server Error');
+    }
+  }
+
+  startLoadingAnimation() {
+    clearTimeout(this.loaderTimeout);
+    this.loaderElement.style.display = 'block';
+    this.loaderTimeout = setTimeout(() => {
+      this.loaderElement.style.opacity = '1';
+    }, LOADER_OPACITY_1_DELAY);
+  }
+
+  endLoadingAnimation() {
+    clearTimeout(this.loaderTimeout);
+    this.loaderElement.style.opacity = '0';
+    this.loaderTimeout = setTimeout(() => {
+      this.loaderElement.style.display = 'none';
+    }, LOADER_DISPLAY_NONE_DELAY);
+  }
+}
diff --git a/frontend/src/favicon.ico b/frontend/src/favicon.ico
new file mode 100644
index 0000000..7eec09c
--- /dev/null
+++ b/frontend/src/favicon.ico
Binary files differ
diff --git a/frontend/src/index.html b/frontend/src/index.html
new file mode 100644
index 0000000..7f436c1
--- /dev/null
+++ b/frontend/src/index.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fidlbolt</title>
+  </head>
+  <body>
+    <div id="Loader" class="loader" hidden>
+      <div class="lds-ellipsis"><div></div><div></div><div></div><div></div></div>
+    </div>
+    <div id="Elm"></div>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.4.8/ace.js"></script>
+  </body>
+</html>
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
new file mode 100644
index 0000000..7c3071b
--- /dev/null
+++ b/frontend/src/main.ts
@@ -0,0 +1,110 @@
+import './ace-modes.js';
+import './style.css';
+
+import {Editors} from './editors';
+import {Elm} from './elm/Main.elm';
+import {Evaluator} from './evaluator';
+
+// A message sent from Elm (see elm/Ports.elm).
+interface ElmMessage {
+  command: string;
+  payload: any;
+}
+
+// Gets the user's light/dark preference (e.g. macOS Catalina Dark Mode).
+function preferredColorScheme(): string {
+  if (window.matchMedia?.('(prefers-color-scheme: dark)').matches) {
+    return 'dark';
+  }
+  return 'light';
+}
+
+function save(key: string, value: object) {
+  localStorage.setItem(key, JSON.stringify(value));
+}
+
+function load(key: string): object | undefined {
+  const item = localStorage.getItem(key);
+  if (item == undefined) {
+    return undefined;
+  }
+  return JSON.parse(item);
+}
+
+function main() {
+  const app = Elm.Main.init({
+    node: document.getElementById('Elm'),
+    flags: {
+      model: load('model'),
+      preferredScheme: preferredColorScheme(),
+    },
+  });
+  const editors = Editors.fromJSON(load('editors') as any);
+  const evaluator = new Evaluator(editors, () => {
+    save('editors', editors.toJSON());
+  });
+
+  app.ports.out.subscribe(({command, payload}: ElmMessage) => {
+    switch (command) {
+      case 'persistModel': {
+        save('model', payload);
+        break;
+      }
+      case 'clearDataAndReload': {
+        localStorage.clear();
+        window.location.reload();
+        break;
+      }
+      case 'applySettings': {
+        editors.applySettings(payload);
+        evaluator.setRefreshDelay(payload.refreshDelay);
+        const classes = document.getElementsByTagName('body')[0].classList;
+        if (payload.scheme === 'dark') {
+          classes.add('dark');
+        } else {
+          classes.remove('dark');
+        }
+        break;
+      }
+      case 'setMainTabEnabled': {
+        const elements = document
+          .getElementById('Main')
+          // Exclude .navbar-item since they always have tabindex -1 (we provide
+          // the keyboard shortcuts Ctrl-[ and Ctrl-] instead).
+          ?.querySelectorAll('input,textarea,select,button:not(.navbar-item)');
+        const tabIndex = payload ? 0 : -1;
+        elements?.forEach(element => {
+          (element as HTMLElement).tabIndex = tabIndex;
+        });
+        break;
+      }
+      case 'updateEditors': {
+        editors.showSessions(payload.input, payload.output);
+        evaluator.setActive(payload.input, payload.output, payload.options);
+        evaluator.run();
+        break;
+      }
+      case 'resizeEditors': {
+        // Use requestAnimationFrame to give Elm time to render. The newly
+        // rendered DOM might affect the size of the container to which the Ace
+        // editors adjust when we call resize() on them.
+        requestAnimationFrame(() => {
+          editors.resize();
+        });
+        break;
+      }
+    }
+  });
+
+  evaluator.start();
+}
+
+// Load ace/mode/json first. Running main() eventually results in setting an
+// editor mode to ace/mode/fidl, prompting Ace to execute the ace/mode/fidl
+// definition function in ace-modes.js. This file imports some resources that
+// are not exposed as separate files by the CDN, like ace/mode/behaviour/cstyle.
+// By first loading ace/mode/json, these common resources get populated in Ace's
+// internal map, so it won't attempt and fail to load them from the CDN.
+(ace as any).config.loadModule('ace/mode/json', () => {
+  main();
+});
diff --git a/frontend/src/mode.ts b/frontend/src/mode.ts
new file mode 100644
index 0000000..0610075
--- /dev/null
+++ b/frontend/src/mode.ts
@@ -0,0 +1,67 @@
+import * as ace from './ace';
+
+// A fidlbolt input/output mode. Corresponds to toString in elm/Mode.elm.
+export type Mode =
+  | 'bytes+'
+  | 'bytes'
+  | 'c'
+  | 'dart'
+  | 'diff'
+  | 'fidl'
+  | 'fidltext'
+  | 'go'
+  | 'hlcpp'
+  | 'json'
+  | 'llcpp'
+  | 'rust';
+
+export type InputMode = 'fidl' | 'fidltext' | 'bytes';
+
+export type OutputMode = Mode;
+
+export const DEFAULT_INPUT: Record<InputMode, string> = {
+  fidl: `\
+library test.fidlbolt;
+
+// Type your code here!
+
+protocol Calculator {
+    Square(int64 x) -> (int64 result);
+};
+`,
+
+  fidltext: `\
+FIDL Text is coming in FTP-058.
+`,
+
+  bytes: `\
+// Type your bytes here!
+
+00 01 ff FF a0b1 c2d3 // coments are ignored
+8badf00d, DEAD BEEF   // group bytes together
+"Hello, World!\\n" 00  // strings work too
+123u32 -1i8 0x80u64   // little endian integers
+0o755u64 0b10101111u8 // cover all your bases!
+`,
+};
+
+const ACE_MODES: Record<Mode, string> = {
+  'bytes+': 'text',
+  bytes: 'bytes',
+  c: 'c_cpp',
+  dart: 'dart',
+  diff: 'text',
+  fidl: 'fidl',
+  fidltext: 'text',
+  go: 'golang',
+  hlcpp: 'c_cpp',
+  json: 'json',
+  llcpp: 'c_cpp',
+  rust: 'rust',
+};
+
+// Converts a fidlbolt mode to an Ace mode. Defaults to the text mode.
+export function getAceMode(mode: Mode): ace.Mode {
+  const aceMode = 'ace/mode/' + (ACE_MODES[mode] ?? 'text');
+  return (aceMode as unknown) as ace.Mode;
+}
diff --git a/frontend/src/style.css b/frontend/src/style.css
new file mode 100644
index 0000000..8eb398e
--- /dev/null
+++ b/frontend/src/style.css
@@ -0,0 +1,390 @@
+html, body {
+  margin: 0;
+  padding: 0;
+}
+
+body {
+  --fg: #333;
+  --bg: #eee;
+  --element: #ddd;
+  --element-hover: #f5f5f5;
+  --intense: #fff;
+  --intense-hover: #e3e3e3;
+  --border: #666;
+
+  font: 16px Helvetica, sans-serif;
+  color: var(--fg);
+  background: var(--bg);
+}
+
+body.dark {
+  --fg: #eee;
+  --bg: #333;
+  --element: #111;
+  --element-hover: #444;
+  --intense: #111;
+  --intense-hover: #444;
+  --border: #aaa;
+}
+
+h1 {
+  font-size: 40px;
+  font-weight: bold;
+  margin: 20px 0;
+}
+
+h2 {
+  font-size: 25px;
+  font-weight: bold;
+  margin: 30px 0;
+}
+
+p {
+  margin: 0 0 1em 0;
+  line-height: 1.5;
+}
+
+ul, ol {
+  margin: 0;
+  padding: 0 0 0 25px;
+  list-style-position: outside;
+}
+
+li {
+  margin: 0 0 1em 0;
+  padding: 0;
+  line-height: 1.5;
+}
+
+kbd {
+  display: inline-block;
+  margin: 0 1px;
+  padding: 2px 3px;
+  border: 1px solid var(--border);
+  border-radius: 3px;
+  background: var(--intense);
+  font: 11px "Menlo", "Consolas", monospace;
+  white-space: nowrap;
+}
+
+.kbd-group {
+  white-space: nowrap;
+}
+
+button {
+  font: inherit;
+  color: inherit;
+  outline: none;
+  border: none;
+  margin: 0;
+}
+
+button:focus {
+  text-decoration: underline;
+}
+
+.heading-fidl {
+  margin-left: 10px;
+}
+
+.heading-bolt {
+  color: var(--intense);
+  -webkit-text-stroke-width: 1.5px;
+  -webkit-text-stroke-color: var(--fg);
+  margin-right: 5px;
+}
+
+.wrapper {
+  margin: 0 20px;
+  display: flex;
+  flex-flow: column;
+  min-height: 100vh;
+}
+
+.heading {
+  margin-top: 5px;
+  text-align: center;
+}
+
+.container {
+  border: 1px solid var(--border);
+  border-radius: 5px;
+  overflow: hidden;
+  flex-grow: 1;
+  margin-bottom: 20px;
+  position: relative;
+}
+
+.split-container {
+  position: absolute;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  right: 0;
+  width: 100%;
+  height: 100%;
+  display: flex;
+}
+
+.split-container--horizontal {
+  flex-direction: column;
+}
+
+.split-container--vertical {
+  flex-direction: row;
+}
+
+.split-item {
+  display: flex;
+  min-width: 0;
+  flex-direction: column;
+  height: 100%;
+}
+
+.split-item--first {
+  flex-shrink: 0;
+}
+
+.split-item--second {
+  flex-grow: 1;
+}
+
+.split-splitter {
+  flex-shrink: 0;
+  background: var(--border);
+}
+
+.split-splitter--vertical {
+  cursor: ew-resize;
+}
+
+.split-splitter--horizontal {
+  cursor: ns-resize;
+}
+
+.navbar {
+  display: flex;
+  min-width: 0;
+}
+
+.navbar-item {
+  text-align: center;
+  flex-grow: 1;
+  min-width: 0;
+  padding: 5px;
+  overflow: hidden;
+  white-space: nowrap;
+  user-select: none;
+  -webkit-user-select: none;
+  outline: none;
+  border: none;
+  /* Override the Ace theme foreground color */
+  color: inherit;
+}
+
+.navbar-item:focus {
+  text-decoration: none;
+}
+
+.navbar-item--active {
+  font-weight: bold;
+}
+
+.navbar-item:not(:first-child) {
+  border-left: 1px solid var(--border);
+}
+
+.navbar-item:not(.navbar-item--active) {
+  cursor: pointer;
+  border-bottom: 1px solid var(--border);
+  background: var(--element);
+}
+
+.navbar-item:not(.navbar-item--active):hover {
+  background: var(--element-hover);
+}
+
+.editor-wrapper {
+  display: contents;
+}
+
+.editor {
+  font: 14px "Menlo", "Consolas", monospace;
+  flex-grow: 1;
+}
+
+.controls-container {
+  position: absolute;
+  top: 30px;
+  right: 20px;
+}
+
+.controls-button {
+  background: var(--intense);
+  padding: 10px;
+  border: 1px solid var(--border);
+  border-radius: 5px;
+  cursor: pointer;
+  display: inline-block;
+  margin-left: 10px;
+  user-select: none;
+  -webkit-user-select: none;
+}
+
+.controls-button:hover {
+  background: var(--intense-hover);
+}
+
+.modal-container {
+  position: absolute;
+  background: rgba(255, 255, 255, 0.5);
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  z-index: 999;
+}
+
+.modal-box {
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  right: 0;
+  max-width: min(100% - 100px, 525px);
+  padding: 0 20px 20px;
+  background: var(--bg);
+  border-left: 1px solid var(--border);
+  overflow-y: auto;
+}
+
+.modal-box .form-control {
+  margin-bottom: 12px;
+}
+
+.form-select {
+  margin-left: 8px;
+  width: 120px;
+}
+
+.form-checkbox {
+  margin-right: 8px;
+}
+
+.form-text, .form-number {
+  margin-left: 8px;
+  width: 40px;
+}
+
+.form-number--invalid {
+  color: #f33;
+}
+
+.form-button-group {
+  margin-top: 30px;
+}
+
+.form-button {
+  background: var(--intense);
+  padding: 8px;
+  margin: 0 5px;
+  border: 1px solid var(--border);
+  border-radius: 5px;
+  cursor: pointer;
+  display: inline-block;
+  font: inherit;
+  color: inherit;
+  font-size: 14px;
+}
+
+.form-button:hover {
+  background: var(--intense-hover);
+}
+
+.output-options {
+  border-top: 1px solid var(--border);
+  background: var(--element);
+  min-height: 36px;
+}
+
+.output-options .form-control {
+  display: inline-block;
+  padding: 10px 15px;
+}
+
+.loader {
+  position: absolute;
+  top: 10px;
+  left: 20px;
+  z-index: 999;
+  opacity: 0;
+  transition: opacity .25s ease-in-out;
+}
+
+@media (max-width: 750px) {
+  .heading {
+    text-align: left;
+  }
+
+  .status {
+    left: 0;
+    right: 0;
+    text-align: center;
+  }
+}
+
+/* https://loading.io/css/ */
+.lds-ellipsis {
+  display: inline-block;
+  position: relative;
+  width: 80px;
+  height: 80px;
+}
+.lds-ellipsis div {
+  position: absolute;
+  top: 33px;
+  width: 13px;
+  height: 13px;
+  border-radius: 50%;
+  background: var(--border);
+  animation-timing-function: cubic-bezier(0, 1, 1, 0);
+}
+.lds-ellipsis div:nth-child(1) {
+  left: 8px;
+  animation: lds-ellipsis1 0.6s infinite;
+}
+.lds-ellipsis div:nth-child(2) {
+  left: 8px;
+  animation: lds-ellipsis2 0.6s infinite;
+}
+.lds-ellipsis div:nth-child(3) {
+  left: 32px;
+  animation: lds-ellipsis2 0.6s infinite;
+}
+.lds-ellipsis div:nth-child(4) {
+  left: 56px;
+  animation: lds-ellipsis3 0.6s infinite;
+}
+@keyframes lds-ellipsis1 {
+  0% {
+    transform: scale(0);
+  }
+  100% {
+    transform: scale(1);
+  }
+}
+@keyframes lds-ellipsis3 {
+  0% {
+    transform: scale(1);
+  }
+  100% {
+    transform: scale(0);
+  }
+}
+@keyframes lds-ellipsis2 {
+  0% {
+    transform: translate(0, 0);
+  }
+  100% {
+    transform: translate(24px, 0);
+  }
+}
\ No newline at end of file
diff --git a/frontend/src/util.ts b/frontend/src/util.ts
new file mode 100644
index 0000000..a91598b
--- /dev/null
+++ b/frontend/src/util.ts
@@ -0,0 +1,58 @@
+// Like Object.values but with a stronger return type.
+export function values<T extends {[key: string]: any}, K extends keyof T>(
+  o: T
+): Required<T>[K][] {
+  return Object.values(o);
+}
+
+// Like Object.entries but with a stronger return type.
+export function entries<T extends {[key: string]: any}, K extends keyof T>(
+  o: T
+): [keyof T, Required<T>[K]][] {
+  return Object.entries(o);
+}
+
+// Wraps text to the given maximum width, preserving existing newlines.
+export function wordWrap(text: string, width: number): string {
+  function wrap(line: string): string {
+    const words = line.split(' ');
+    let lineLength = 0;
+    const withNewlines = words.map(w => {
+      lineLength += w.length + 1;
+      if (lineLength > width) {
+        lineLength = w.length;
+        return '\n' + w;
+      }
+      return w;
+    });
+    return withNewlines.join(' ');
+  }
+  const lines = text.split('\n');
+  return lines.map(wrap).join('\n');
+}
+
+// A type for timeout IDs.
+export type Timeout = ReturnType<typeof setTimeout>;
+
+// Wraps a promise with a timeout, in milliseconds.
+export function withTimeout<T>(
+  ms: number,
+  errMsg: string,
+  promise: Promise<T>
+): Promise<T> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      reject(new Error(errMsg));
+    }, ms);
+    promise.then(
+      (res: T) => {
+        clearTimeout(timeout);
+        resolve(res);
+      },
+      err => {
+        clearTimeout(timeout);
+        reject(err);
+      }
+    );
+  });
+}
diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json
new file mode 100644
index 0000000..e2c9e8b
--- /dev/null
+++ b/frontend/tsconfig.json
@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "outDir": "./dist/",
+    "target": "es2017",
+    "module": "es6",
+    "moduleResolution": "node",
+    "strict": true,
+    "noEmitOnError": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitReturns": true,
+    "noUnusedLocals": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "files": [
+    "src/main.ts",
+    "src/elm.d.ts"
+  ]
+}
diff --git a/frontend/webpack.config.js b/frontend/webpack.config.js
new file mode 100644
index 0000000..795f2b1
--- /dev/null
+++ b/frontend/webpack.config.js
@@ -0,0 +1,63 @@
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
+const TerserJSPlugin = require('terser-webpack-plugin');
+const path = require('path');
+
+const srcPath = path.resolve(__dirname, 'src');
+const elmPath = path.join(srcPath, "elm");
+const dstPath = path.resolve(__dirname, 'dist');
+
+module.exports = (env, argv) => ({
+  entry: './src/main.ts',
+  output: {
+    path: dstPath,
+    filename: 'bundle.js',
+  },
+  resolve: {
+    extensions: ['.ts', '.js']
+  },
+  plugins: [
+    new HtmlWebpackPlugin({
+      template: 'src/index.html',
+      favicon: 'src/favicon.ico',
+    }),
+    new MiniCssExtractPlugin({
+      filename: 'style.css',
+    }),
+  ],
+  optimization: {
+    minimizer: [
+      new TerserJSPlugin({}),
+      new OptimizeCSSAssetsPlugin({}),
+    ],
+  },
+  module: {
+    rules: [
+      {
+        test: /\.ts$/,
+        include: srcPath,
+        use: 'ts-loader',
+      },
+      {
+        test: /\.elm$/,
+        include: elmPath,
+        use: {
+          loader: 'elm-webpack-loader',
+          options: {
+            cwd: elmPath,
+            debug: argv.mode == "development",
+            optimize: argv.mode == "production",
+          }
+        }
+      },
+      {
+        test: /\.css$/,
+        use: [
+          MiniCssExtractPlugin.loader,
+          'css-loader',
+        ],
+      },
+    ],
+  },
+});