Unraveling the Mystery: Why divide compilerOptions in tsconfig.lib.json in NxWorkspace, Angular?

Why does my NxWorkspace have a tsconfig.lib.json file? I only have one Angular app in my workspace.

tsconfig.json
{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "../../dist/out-tsc",
    "declaration": true,
    "types": []
  },
  "include": [
    "**/*.ts"
  ],
  "exclude": [
    "jest.config.ts",
    "**/*.spec.ts",
    "**/*.test.ts"
  ]
}

tsconfig.lib.json
{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "../../dist/out-tsc",
    "module": "commonjs",
    "types": ["jest", "node"]
  },
  "include": ["jest.config.ts", "**/*.test.ts", "**/*.spec.ts", "**/*.d.ts"]
}
  1. Is there a specific reason for splitting the 'compilerOptions' this way, or was it done without much thought?

  2. If I move the compiler options from tsconfig.lib.json to tsconfig.json, will everything still function correctly? Am I overlooking something?

Answer №1

I believe this intentional design decision is not the result of careless programming. The goal is to promote maximum independence for the libs. By allowing users to define their own custom TypeScript configuration, they can establish clear boundaries for their libraries and enable more extensive configuration options for the libs.

Furthermore, users are able to define a root tsconfig within their nx workspace, known as tsconfig.base.json. As stated in the official documentation:

/tsconfig.base.json establishes the global TypeScript settings and sets aliases for each library to simplify TS/JS imports.

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