Walk Sync - Stack Based

walkSync.js

async function walkSync(rootDir) {
	const fs = require('fs')
	const path = require('path')

	function readdir(path) {
		return new Promise((resolve, reject) => {
			fs.readdir(path, (err, files) => err ? reject(err) : resolve(files))
		})
	}

	function stat(path) {
		return new Promise((resolve, reject) => {
			fs.stat(path, (err, stats) => err ? reject(err) : resolve(stats))
		})
	}

	async function pushStack(baseDir) {
		stack.push({ baseDir, files: await readdir(baseDir) })
	}

	const results = []
	const stack = []

	await pushStack(rootDir)

	while (stack.length > 0) {
		let { baseDir, files } = stack.pop()
		for (let file of files) {
			let relativeFilePath = path.join(baseDir, file)
			if ((await stat(relativeFilePath)).isDirectory()) {
				await pushStack(relativeFilePath)
			}
			else {
				results.push(relativeFilePath)
			}
		}
	}

	return results
}