重载和回调

❌ 不要编写仅在回调参数上不同的单独重载：

❌ Don't write separate overloads that differ only on callback arity:

/* WRONG */
declare function beforeAll(action: () => void, timeout?: number): void;
declare function beforeAll(
  action: (done: DoneFn) => void,
  timeout?: number
): void;

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/* OK */
declare function beforeAll(
  action: (done: DoneFn) => void,
  timeout?: number
): void;

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