calculate hash from file stream

hash_from_file.js

const fs = require('fs');
const crypto = require('crypto');

const hash_from_file = (file, algorithm = 'sha256') => new Promise((resolve, reject) => {
    try {
        const stat = fs.statSync(file);
        const hash = crypto
            .createHash(algorithm)
            .setEncoding('hex');
        fs
            .createReadStream(file)
            .pipe(hash)
            .once('error', reject)
            .once('finish', () => resolve(`${hash.read()}-${stat.size.toString(0x10)}`));
    } catch(err) {
        reject(err);
    }
});

async function main() {
    try {
        const hash = await hash_from_file("/Users/2bit/demo.mp3", 'sha1');
        console.log(hash);
    } catch(err) {
        console.error(err);
    }
};

// main();