tsconfig.build.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "noEmit": false,
    "declaration": true,
    "declarationMap": true,
    "sourceMap": true,
    "outDir": "dist",
    "rootDir": "src"
  },
  "include": ["src"],
  "exclude": [
    "node_modules",
    "dist",
    "src/**/*.test.ts",
    "src/**/*.test.tsx",
    "src/**/__tests__/**",
    "conformance",
    "bench",
    // The codegen spec must never be transpiled. React Native's babel plugin
    // rewrites the default export into a static view config only when it sees
    // an `ExportDefaultDeclaration` whose callee is `codegenNativeComponent`
    // (@react-native/babel-plugin-codegen/index.js:155-160), and tsc's
    // CommonJS emit turns that into `exports.default = ...`, which the visitor
    // never matches. Nothing in the build reports it: the default export stays
    // the runtime `codegenNativeComponent`, which returns
    // `requireNativeComponent` (Libraries/Utilities/codegenNativeComponent.js:67-70)
    // — dead under bridgeless, where a view config comes from
    // `getViewManagerConfig` and that soft-errors to null
    // (BridgelessUIManager.js:273-291). What a consumer gets is a run that
    // renders with a null view config, an invariant violation
    // (ReactNativeViewConfigRegistry.js:122), or — where the require resolves
    // to nothing at all — the throw in `RunHost`. The `<Text selectable>`
    // fallback that used to absorb both went with the old architecture in
    // 0.10.0. Loud at render, silent here, which is why `npm run check:codegen`
    // reproduces the transpiled copy as a negative control.
    //
    // EXCLUDING IT HERE IS NOT ENOUGH ON ITS OWN. `exclude` only filters the
    // `include` glob: a file reached by an `import` — even an `import type` —
    // is pulled back into the program and emitted anyway (verified with tsc
    // 5.5). So nothing that IS built may import this module statically: the
    // only way to reach it from `RunHost` is a call-expression `require`,
    // which tsc does not follow. `check:codegen` builds this config into a
    // scratch directory and fails if the spec reappears in the output.
    "src/view/SelectableRunHostNativeComponent.ts"
  ]
}