NodeJS fs walk() or glob or fast-glob

It started with this:

function walk(directory, filepaths = []) {
    const files = fs.readdirSync(directory);
    for (let filename of files) {
        const filepath = path.join(directory, filename);
        if (fs.statSync(filepath).isDirectory()) {
            walk(filepath, filepaths);
        } else if (path.extname(filename) === '.md') {
            filepaths.push(filepath);
        }
    }
    return filepaths;
}

And you use it like this:

const foundFiles = walk(someDirectoryOfMine);
console.log(foundFiles.length);

I thought, perhaps it's faster or better to use glob. So I installed that.
Then I found, fast-glob which sounds faster. You use both in a synchronous way.

I have a directory with about 450 files, of which 320 of them are .md files. Let's compare:

walk: 10.212ms
glob: 37.492ms
fg: 14.200ms

I measured it using console.time like this:

console.time('walk');
const foundFiles = walk(someDirectoryOfMine);
console.timeEnd('walk');
console.log(foundFiles.length);

I suppose those packages have other fancier features but, I guess this just goes to show, keep it simple.

UPDATE June 2021

The origins of this blog post were that I need a simple function to find files on disk. Later, the requirements became a bit more complex so I needed something a bit more advanced. In shopping around I found fdir which, from testing, performed excellently and has a great API (and documentation). I would handsdown use that again.