I want to implement a function that enumerates all files in directory. I think the function should

• Return a Promise, because underlying readdir call is prefered over readdirSync.
• Be a generator function, because checking statSync(...).isFile() might take some time and maybe, I will need only first few files…

So my attempt

import * as fs from 'fs'; import * as path from 'path';  function enumerateFiles(dir: string): Promise<IterableIterator<string>> {     let result = function* (files: string[]): IterableIterator<string> {         for (let enty of files) {             let fullpath = path.join(dir, enty);              if (fs.statSync(fullpath).isFile())                 yield fullpath;         }     };      return new Promise<IterableIterator<string>>((resolve, reject) => {         fs.readdir(dir, (err, files) => {             if (err)                 reject(err);             else                 resolve(result(files));         });     }); } 

And usage

for (let file of await enumerateFiles(String.raw`C:\Windows\Web\Screen`))     console.log(file);  // C:\Windows\Web\Screen\img100.jpg // C:\Windows\Web\Screen\img101.jpg // ... 

What do you think? I’m really not sure about combining Promises with generator functions. Especially in this order…