Function isAsyncFunction

isAsyncFunction(v: unknown): v is (...args: any[]) => Promise<any>
Checks if the input is an async function.

检查输入是否为异步函数。
Parameters
- v: unknown
  The value to check. 要检查的值
Returns v is (...args: any[]) => Promise<any>
True if the value is an async function, false otherwise. 如果值为异步函数则返回 true，否则返回 false
Remarks
This function uses Object.prototype.toString internally, so it is cross-realm safe (e.g. async functions created in an iframe or node:vm context are still detected). It does not match async generator functions.

此函数内部使用 Object.prototype.toString，因此跨上下文安全(例如在 iframe 或 node:vm 上下文中创建的异步函数也能被识别)。它不匹配异步生成器函数。
Example
```
isAsyncFunction(async () => {}) // => true
isAsyncFunction(() => {}) // => false
isAsyncFunction(Promise.resolve()) // => false
```
- Defined in src/predicate/is-async-function.ts:26