Function deferred

deferred<T = unknown>(): Deferred<T>
Create a deferred promise, exposing resolve and reject functions.

创建一个延迟 Promise，暴露 resolve 和 reject 函数。
Type Parameters
- T = unknown
  The type of the resolved value / 解析值的类型
Returns Deferred<T>
An object with promise, resolve and reject properties.
Remarks
The returned resolve and reject functions can be called externally to control the lifecycle of the promise. Only the first call takes effect; subsequent calls are ignored by the underlying Promise.

返回的对象中的 resolve 和 reject 函数可以被外部调用，以控制 Promise 的生命周期。只有第一次调用生效，后续调用会被底层的 Promise 忽略。
Example
```
const { promise, resolve, reject } = deferred<string>()

// Later, in any context:
resolve('done')
// or
reject(new Error('failed'))

const result = await promise // => 'done'
```
- Defined in src/promise/deferred.ts:58