Function validateModuleTreeshake

scripts/validate-build.ts:217–264

(
  config: BuildConfig,
  entryModulePath: string,
  external: string[] = []
)

}

async function validateModuleTreeshake(
  config: BuildConfig,
  entryModulePath: string,
  external: string[] = []
): Promise<void> {
  const virtualInputId = `@index`;
  const bundle = await rollup({
    input: virtualInputId,
    treeshake: {
      moduleSideEffects: 'no-external',
    },
    external: ['@builder.io/qwik/build', '@builder.io/qwik', ...external],
    plugins: [
      {
        name: 'resolver',
        resolveId(id) {
          if (id === virtualInputId) {
            return id;
          }
        },
        load(id) {
          if (id === virtualInputId) {
            return `import "${entryModulePath}";`;
          }
        },
      },
    ],
    onwarn(warning) {
      if (warning.code !== 'EMPTY_BUNDLE') {
        throw warning;
      }
    },
  });

  const o = await bundle.generate({
    format: 'es',
  });

  const output = o.output[0];
  const outputCode = output.code.trim();

  if (outputCode !== '') {
    console.log(outputCode);
    throw new Error(`🧨  Unable to treeshake for ${entryModulePath}`);
  }

  console.log(`🌳  validated treeshake for ${entryModulePath}`);
}