export async function inlineLocales()

in packages/angular_devkit/build_angular/src/utils/process-bundle.ts [130:227]
77 lines of code
25 McCabe index (conditional complexity)

export async function inlineLocales(options: InlineOptions) {
  if (!i18n || i18n.inlineLocales.size === 0) {
    return { file: options.filename, diagnostics: [], count: 0 };
  }
  if (i18n.flatOutput && i18n.inlineLocales.size > 1) {
    throw new Error('Flat output is only supported when inlining one locale.');
  }

  const hasLocalizeName = options.code.includes(localizeName);
  if (!hasLocalizeName && !options.setLocale) {
    return inlineCopyOnly(options);
  }

  await loadLocalizeTools();

  let ast: ParseResult | undefined | null;
  try {
    ast = parseSync(options.code, {
      babelrc: false,
      configFile: false,
      sourceType: 'script',
      filename: options.filename,
    });
  } catch (error) {
    if (error.message) {
      // Make the error more readable.
      // Same errors will contain the full content of the file as the error message
      // Which makes it hard to find the actual error message.
      const index = error.message.indexOf(')\n');
      const msg = index !== -1 ? error.message.substr(0, index + 1) : error.message;
      throw new Error(`${msg}\nAn error occurred inlining file "${options.filename}"`);
    }
  }

  if (!ast) {
    throw new Error(`Unknown error occurred inlining file "${options.filename}"`);
  }

  if (!USE_LOCALIZE_PLUGINS) {
    return inlineLocalesDirect(ast, options);
  }

  const diagnostics = [];
  for (const locale of i18n.inlineLocales) {
    const isSourceLocale = locale === i18n.sourceLocale;
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const translations: any = isSourceLocale ? {} : i18n.locales[locale].translation || {};
    let localeDataContent;
    if (options.setLocale) {
      // If locale data is provided, load it and prepend to file
      const localeDataPath = i18n.locales[locale]?.dataPath;
      if (localeDataPath) {
        localeDataContent = await loadLocaleData(localeDataPath, true, options.es5);
      }
    }

    const { diagnostics: localeDiagnostics, plugins } = await createI18nPlugins(
      locale,
      translations,
      isSourceLocale ? 'ignore' : options.missingTranslation || 'warning',
      true,
      localeDataContent,
    );
    const transformResult = await transformFromAstSync(ast, options.code, {
      filename: options.filename,
      // using false ensures that babel will NOT search and process sourcemap comments (large memory usage)
      // The types do not include the false option even though it is valid
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      inputSourceMap: false as any,
      babelrc: false,
      configFile: false,
      plugins,
      compact: !shouldBeautify,
      sourceMaps: !!options.map,
    });

    diagnostics.push(...localeDiagnostics.messages);

    if (!transformResult || !transformResult.code) {
      throw new Error(`Unknown error occurred processing bundle for "${options.filename}".`);
    }

    const outputPath = path.join(
      options.outputPath,
      i18n.flatOutput ? '' : locale,
      options.filename,
    );
    fs.writeFileSync(outputPath, transformResult.code);

    if (options.map && transformResult.map) {
      const outputMap = remapping([transformResult.map as SourceMapInput, options.map], () => null);

      fs.writeFileSync(outputPath + '.map', JSON.stringify(outputMap));
    }
  }

  return { file: options.filename, diagnostics };
}