filterOutEntrypoints() — react Function Reference

Architecture documentation for the filterOutEntrypoints() function in packaging.js from the react codebase.

Function javascript BabelCompiler Entrypoint called by 1

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BabelCompiler→ Entrypoint→ filterOutEntrypoints() — react Function Reference

Dependency Diagram

graph TD
  331d1458_b7bf_3efa_ecd7_4dabd174a520["filterOutEntrypoints()"]
  fef369e3_6dfd_944a_16c1_5addc35f485d["packaging.js"]
  331d1458_b7bf_3efa_ecd7_4dabd174a520 -->|defined in| fef369e3_6dfd_944a_16c1_5addc35f485d
  7c67dee2_eb13_96b1_25ba_6fce3f0ea220["prepareNpmPackage()"]
  7c67dee2_eb13_96b1_25ba_6fce3f0ea220 -->|calls| 331d1458_b7bf_3efa_ecd7_4dabd174a520
  style 331d1458_b7bf_3efa_ecd7_4dabd174a520 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

scripts/rollup/packaging.js lines 171–251

function filterOutEntrypoints(name) {
  // Remove entry point files that are not built in this configuration.
  let jsonPath = `build/node_modules/${name}/package.json`;
  let packageJSON = JSON.parse(readFileSync(jsonPath));
  let files = packageJSON.files;
  let exportsJSON = packageJSON.exports;
  let browserJSON = packageJSON.browser;
  if (!Array.isArray(files)) {
    throw new Error('expected all package.json files to contain a files field');
  }
  let changed = false;
  for (let i = 0; i < files.length; i++) {
    let filename = files[i];
    let entry =
      filename === 'index.js'
        ? name
        : name + '/' + filename.replace(/\.js$/, '');
    let hasBundle = entryPointsToHasBundle.get(entry);
    if (hasBundle === undefined) {
      // This entry doesn't exist in the bundles. Check if something similar exists.
      hasBundle =
        entryPointsToHasBundle.get(entry + '.node') ||
        entryPointsToHasBundle.get(entry + '.browser');

      // The .react-server and .rsc suffixes may not have a bundle representation but
      // should infer their bundle status from the non-suffixed entry point.
      if (entry.endsWith('.react-server')) {
        hasBundle = entryPointsToHasBundle.get(
          entry.slice(0, '.react-server'.length * -1)
        );
      } else if (entry.endsWith('.rsc')) {
        hasBundle = entryPointsToHasBundle.get(
          entry.slice(0, '.rsc'.length * -1)
        );
      }
    }
    if (hasBundle === undefined) {
      // This doesn't exist in the bundles. It's an extra file.
    } else if (hasBundle === true) {
      // This is built in this release channel.
    } else {
      // This doesn't have any bundleTypes in this release channel.
      // Let's remove it.
      files.splice(i, 1);
      i--;
      try {
        unlinkSync(`build/node_modules/${name}/${filename}`);
      } catch (err) {
        // If the file doesn't exist we can just move on. Otherwise throw the halt the build
        if (err.code !== 'ENOENT') {
          throw err;
        }
      }
      changed = true;
      // Remove it from the exports field too if it exists.
      if (exportsJSON) {
        if (filename === 'index.js') {
          delete exportsJSON['.'];
        } else {
          delete exportsJSON['./' + filename.replace(/\.js$/, '')];
        }
      }
      if (browserJSON) {
        delete browserJSON['./' + filename];
      }
    }

    // We only export the source directory so Jest and Rollup can access them
    // during local development and at build time. The files don't exist in the
    // public builds, so we don't need the export entry, either.
    const sourceWildcardExport = './src/*';
    if (exportsJSON && exportsJSON[sourceWildcardExport]) {
      delete exportsJSON[sourceWildcardExport];
      changed = true;
    }
  }
  if (changed) {
    let newJSON = JSON.stringify(packageJSON, null, '  ');
    writeFileSync(jsonPath, newJSON);
  }
}