Install Bazel. Bazel is the exclusive build system for Tink for TypeScript/JavaScript (although you don't need it to merely depend on the tink-crypto package from npm, only to build from source).
Check out source code and run bazel build. It will download dependencies and do all the other npm-related stuff automatically.
package.json.package.json, run yarn (or, if you don't have the Yarn CLI installed globally, npx yarn) to update yarn.lock.We‘re currently using a pretty ad-hoc method of depending on protos from TypeScript code; it involves feeding the output from one build toolchain into a different one. The implementation is in internal/ts_library_from_closure.bzl. Note that it’s also necessary to add any new protos to internal/BUILD.bazel.
There's no support for code splitting right now; index.ts is the sole entry point and everything has to be directly or indirectly exported from there.