runtime/web_view/js/tsconfig.json

{
    "compileOnSave": true,
    "compilerOptions": {
        "strict": true,
        "target": "es5",
        "sourceMap": true,
        "outDir": "out/",
        "module": "commonjs",
        "lib": [
            "dom",
            "es5",
            "es2015.collection"
        ]
    },
    "include": [
        "src/*.ts"
    ]
}