Function domainify

packages/google-cloud-serverless/src/utils.ts:8–10

(fn: (...args: A) => R)

 * @returns function which runs in the newly created domain or in the existing one
 */
export function domainify<A extends unknown[], R>(fn: (...args: A) => R): (...args: A) => R | void {
  return (...args) => withIsolationScope(() => fn(...args));
}

/**
 * @param source function to be wrapped