Function promisify

promisify<T>(
fn: (...args: any[]) => void,
context?: any,
): (...args: any[]) => Promise<T>
将基于回调的函数转换为返回 Promise 的函数 Converts a callback-based function to a Promise-returning function
Type Parameters
- T
  Promise 解析值的类型 The type of the resolved Promise value
Parameters
- fn: (...args: any[]) => void
  需要转换的原始回调函数 The original callback function to be converted
- Optionalcontext: any
  函数执行时的上下文（this 值） The context (this value) for function execution
Returns (...args: any[]) => Promise<T>
返回一个新函数，该函数接受与原函数相同的参数，但返回 Promise Returns a new function that accepts the same arguments as the original but returns a Promise
Example
```
// 示例：转换 Node.js 的 fs.readFile
// Example: Convert Node.js fs.readFile
const readFilePromise = promisify(fs.readFile, fs);
readFilePromise('file.txt', 'utf8').then(console.log);
```
- Defined in src/promise.ts:144