Function generateBundle

rollup.config.mjs:88–117

(options, bundle)

  return {
    name: 'gather-bundled-dependencies',
    generateBundle(options, bundle) {
      for (const chunk of Object.values(bundle)) {
        if (chunk.type === 'chunk' && chunk.modules) {
          // chunk.modules is an object where keys are the absolute file paths
          Object.keys(chunk.modules).forEach(modulePath => {
            const packageName = getPackageName(modulePath);
            if (packageName) {
              aggregatedStats.bundledPackages.add(packageName);
            }
          });
        }
      }
      aggregatedStats.bundlesProcessed++;

      // Only write the file when the last bundle is finished
      if (aggregatedStats.bundlesProcessed === aggregatedStats.totalBundles) {
        const outputPath = path.join(thirdPartyDir, 'bundled-packages.json');

        const bundledDevDeps = Object.fromEntries(
          Object.entries(devDependencies).filter(
            ([name]) =>
              aggregatedStats.bundledPackages.has(name) ||
              name === 'chrome-devtools-frontend' ||
              name === 'lighthouse',
          ),
        );

        fs.writeFileSync(outputPath, JSON.stringify(bundledDevDeps, null, 2));
      }
    },
  };
}