How to copy multiple files using fs.copyFile node?

Question

I am using fs.copyFile to copy files from one location to another. I am doing this twice in order to copy two files. It's redundant and I would like to make my code better by maybe copying both files to the destination with a single call? How can I achieve this?

fs.copyFile('src/blah.txt', 'build/blah.txt', (err) => {
        if (err) throw err;
});
fs.copyFile('src/unk.txt', 'build/unk.txt', (err) => {
        if (err) throw err;
});

Answer 1

You can simply create a function of your own that takes the src and dest path and an array of filenames as arguments:

const util = require('util');
const fs = require('fs');
const path = require('path');
const copyFilePromise = util.promisify(fs.copyFile);

function copyFiles(srcDir, destDir, files) {
    return Promise.all(files.map(f => {
       return copyFilePromise(path.join(srcDir, f), path.join(destDir, f));
    }));
}

// usage
copyFiles('src', 'build', ['unk.txt', 'blah.txt']).then(() => {
   console.log("done");
}).catch(err => {
   console.log(err);
});