moodle-async-await-grunt-fix.js

  tasks.fix_generator = function () {
    const config = grunt.config('fix_generator');
    const files = grunt.file.expand({}, config.dist.src);
    files.forEach((file) => {
      const contents = fs.readFileSync(file).toString('utf-8');
      const match = contents.match(/\ndefine\(\s*(\[|function)/);
      if (match) {
        const prepended = contents.substring(0, match.index);
        let body = contents.substring(match.index);
        let append = '';
        const sourcemap = body.match(/\/\/#\ssourceMappingURL/);
        if (sourcemap) {
          append = body.substring(sourcemap.index);
          body = body.substring(0, sourcemap.index);
        }
        fs.writeFileSync(file, `${body}\n${prepended}\n${append}`.trim());
      }
    });
  };