tsconfig.build.json

{
  "compilerOptions": {
    "noEmit": false,
    "types": [
      "./src/declarations.d.ts"
      // we don't want to include our types for `jest`, our custom matchers etc.
      // if one of those is referenced in our production code, we want a
      // build error, so we can fix it
      // we also explicitly do not include `node` here as we don't want our build
      // artefact to rely on those types (for now, at least)
    ]
  },
  "extends": "./tsconfig.json",
  "files": [
    // during the `compileTs` build step, this will momentarily be populated
    // with all entry points specified in the `package.json` file
    // this way we don't bundle up any files that cannot be reached by an
    // `import` statement
  ],
  "include": [],
  "exclude": []
}