export default async function getValidatedManifest()

in src/util/manifest.js [15:66]
37 lines of code
8 McCabe index (conditional complexity)

export default async function getValidatedManifest(sourceDir) {
  const manifestFile = path.join(sourceDir, 'manifest.json');
  log.debug(`Validating manifest at ${manifestFile}`);

  let manifestContents;

  try {
    manifestContents = await fs.readFile(manifestFile, { encoding: 'utf-8' });
  } catch (error) {
    throw new InvalidManifest(
      `Could not read manifest.json file at ${manifestFile}: ${error}`,
    );
  }

  manifestContents = stripBom(manifestContents);

  let manifestData;

  try {
    manifestData = parseJSON(stripJsonComments(manifestContents));
  } catch (error) {
    throw new InvalidManifest(
      `Error parsing manifest.json file at ${manifestFile}: ${error}`,
    );
  }

  const errors = [];
  // This is just some basic validation of what web-ext needs, not
  // what Firefox will need to run the extension.
  // TODO: integrate with the addons-linter for actual validation.
  if (!manifestData.name) {
    errors.push('missing "name" property');
  }
  if (!manifestData.version) {
    errors.push('missing "version" property');
  }

  if (manifestData.applications && !manifestData.applications.gecko) {
    // Since the applications property only applies to gecko, make
    // sure 'gecko' exists when 'applications' is defined. This should
    // make introspection of gecko properties easier.
    errors.push('missing "applications.gecko" property');
  }

  if (errors.length) {
    throw new InvalidManifest(
      `Manifest at ${manifestFile} is invalid: ${errors.join('; ')}`,
    );
  }

  return manifestData;
}