.js

const fs = require('fs')
const { join } = require('path')

module.exports = { crawlSync, crawlAsync }

function crawlSync(path) {
    let cache = new Map()
    const stats = fs.statSync(path)                       // <-- A

    if (stats.isFile()) {
        cache.set(path, stats)
    } else if (stats.isDirectory()) {
        for (const childPath of fs.readdirSync(path)) {   // <-- B
            cache = new Map([...cache, ...crawlSync(join(path, childPath))])
        }
    }
    return cache
}

async function crawlAsync(path) {
    let cache = new Map()
    const stats = await fs.stat(path)                     // <-- A

    if (stats.isFile()) {
        cache.set(path, stats)
    } else if (stats.isDirectory()) {
        for (const childPath of await fs.readdir(path)) { // <-- B
            cache = new Map([...cache, ...(await crawlAsync(join(path, childPath)))])
        }
    }
    return cache
}