function buildBabelConfig()

in packages/metro-react-native-babel-transformer/src/index.js [127:181]

• 41 lines of code
• 6 McCabe index (conditional complexity)

function buildBabelConfig(
  filename,
  options,
  plugins?: Plugins = [],
): BabelCoreOptions {
  const babelRC = getBabelRC(options);

  const extraConfig: BabelCoreOptions = {
    babelrc:
      typeof options.enableBabelRCLookup === 'boolean'
        ? options.enableBabelRCLookup
        : true,
    code: false,
    filename,
    highlightCode: true,
  };

  let config: BabelCoreOptions = {
    ...babelRC,
    ...extraConfig,
  };

  // Add extra plugins
  const extraPlugins = [];

  if (options.inlineRequires) {
    extraPlugins.push(inlineRequiresPlugin);
  }

  const withExtrPlugins = (config.plugins = extraPlugins.concat(
    config.plugins,
    plugins,
  ));

  if (options.dev && options.hot) {
    // Note: this intentionally doesn't include the path separator because
    // I'm not sure which one it should use on Windows, and false positives
    // are unlikely anyway. If you later decide to include the separator,
    // don't forget that the string usually *starts* with "node_modules" so
    // the first one often won't be there.
    const mayContainEditableReactComponents =
      filename.indexOf('node_modules') === -1;

    if (mayContainEditableReactComponents) {
      const hmrConfig = makeHMRConfig();
      hmrConfig.plugins = withExtrPlugins.concat(hmrConfig.plugins);
      config = Object.assign({}, config, hmrConfig);
    }
  }

  return {
    ...babelRC,
    ...config,
  };
}