我正在尝试promisify标准节点fs. writeFile。我有node和bluebird的类型，这是我在这里选择的Promise库：

const f = Promise.promisify(fs.writeFile)
return f(file, content); // Should be a promise

这不起作用，因为：
[ts]提供的参数与调用目标的任何签名都不匹配。const f：（arg1：string）=> Promise<{}>
所以我选择了错误的重载方法，因为对promisify的调用不能真正知道我猜的是什么。或者甚至不是这样，而是带有可选参数的东西，因为这是三个重载的writeFile：

export function writeFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;

promisify有很多# of args的重载，看起来像这样：

/**
 * Returns a function that will wrap the given `nodeFunction`. Instead of taking a callback, the returned function will return a promise whose fate is decided by the callback behavior of the given node function. The node function should conform to node.js convention of accepting a callback as last argument and calling that callback with error as the first argument and success value on the second argument.
 *
 * If the `nodeFunction` calls its callback with multiple success values, the fulfillment value will be an array of them.
 *
 * If you pass a `receiver`, the `nodeFunction` will be called as a method on the `receiver`.
 */
static promisify<T>(func: (callback: (err:any, result: T) => void) => void, receiver?: any): () => Promise<T>;
static promisify<T, A1>(func: (arg1: A1, callback: (err: any, result: T) => void) => void, receiver?: any): (arg1: A1) => Promise<T>;
static promisify<T, A1, A2>(func: (arg1: A1, arg2: A2, callback: (err: any, result: T) => void) => void, receiver?: any): (arg1: A1, arg2: A2) => Promise<T>;
static promisify<T, A1, A2, A3>(func: (arg1: A1, arg2: A2, arg3: A3, callback: (err: any, result: T) => void) => void, receiver?: any): (arg1: A1, arg2: A2, arg3: A3) => Promise<T>;
static promisify<T, A1, A2, A3, A4>(func: (arg1: A1, arg2: A2, arg3: A3, arg4: A4, callback: (err: any, result: T) => void) => void, receiver?: any): (arg1: A1, arg2: A2, arg3: A3, arg4: A4) => Promise<T>;
static promisify<T, A1, A2, A3, A4, A5>(func: (arg1: A1, arg2: A2, arg3: A3, arg4: A4, arg5: A5, callback: (err: any, result: T) => void) => void, receiver?: any): (arg1: A1, arg2: A2, arg3: A3, arg4: A4, arg5: A5) => Promise<T>;
static promisify(nodeFunction: Function, receiver?: any): Function;

因此，它似乎是错误的承诺，而正在使用。有没有更干净的方法让我达到我想要的？目前我必须解决这个问题：

const writeFile : (filename: string, data: any, callback: (err: NodeJS.ErrnoException) => void) => void = fs.writeFile
const f = Promise.promisify(writeFile)
return f(file, content);

我觉得这很难看也很冗长