Any slashes should be stripped off of the end before walking.

[OmgImAlexis]

Notice the double slash in the filename.

import * as fdir from 'fdir';

const go = async () => {
    const files = await fdir.async('/Users/xo/Downloads/', {});
    console.log(files); // ['/Users/xo/Downloads//Download.PDF']
};

go().catch(error => {
    console.error(error);
});