@pengzhanbo/utils - v3.7.3
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    Function createSingletonPromise

    • Wrap a promise as a singleton, returning the same promise on multiple calls.

      Through the singleton.reset() method, you can reset the currently expired promise and wait for it to close normally.

      将一个 promise 包装为单例，在多次调用时，返回同一个 promise

      通过 singleton.reset 方法可以重置当前过期的 promise，并等待其正常关闭

      Type Parameters

      • T

        The type of the resolved value / 解析值的类型

      Parameters

      • fn: () => Promise<T>

        the function that returns the promise to wrap / 要包装的 promise 返回函数

      Returns SingletonPromise<T>

      a function that returns the wrapped promise / 返回包装后的 promise

      let i = 1
      const singleton = createSingletonPromise(() => Promise.resolve(i++))

      const p1 = singleton() // fn only called once, i++ → 1
      const p2 = singleton() // same promise returned, fn not called again
      console.log(p1 === p2) // true

      await p1 // => 1
      await p2 // => 1 (same cached result)

      let i = 1
      const singleton = createSingletonPromise(() => Promise.resolve(i++))

      await singleton() // => 1
      await singleton.reset() // clear cached promise, wait for pending if any
      await singleton() // => 2 (fn called again, i++ → 2)

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