Function getTaskSourceFilePath

build-system/task-runner/amp-task-runner.js:137–147

* Returns a task's source file path after making sure it is either a valid JS * file or a valid dir. * @param {string} taskSourceFileName * @return {string}

(taskSourceFileName)

 * @return {string}
 */
function getTaskSourceFilePath(taskSourceFileName) {
  const tasksDir = path.join(__dirname, '..', 'tasks');
  const taskSourceFilePath = path.join(tasksDir, taskSourceFileName);
  const isValidSourceFilePath =
    fs.pathExistsSync(`${taskSourceFilePath}.js`) || // Task lives in a JS file.
    fs.pathExistsSync(taskSourceFilePath); // Task lives in a directory.
  if (!isValidSourceFilePath) {
    handleInvalidTaskError(taskSourceFileName);
  }
  return taskSourceFilePath;
}

/**
 * Returns a task function after making sure it is valid.