tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "checkJs": true,
    "noEmit": true,
    "strict": true,
    "target": "es6",
    "module": "commonjs",
    "lib": [
      "dom", //
      "es6",
      "es2017",
      "esnext.asynciterable"
    ],
    "sourceMap": true,
    // "outDir": "./dist", /** disabled since we don't emit js */
    "moduleResolution": "node",
    "removeComments": false,
    "noImplicitAny": false /** TODO - true (will require quite some fixing; it's worth it) */,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "noImplicitThis": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "resolveJsonModule": true,
    "baseUrl": "."
  },
  "exclude": [
    "node_modules", //
    "build",
    "docs"
  ],
  "include": [
    "./index.js", //
    "./lib/**/*.js"
  ]
}