How to use hash-sum

_cacheDelete(key) {
    let file = Fs.join(this.dir, hash(key));
    if (!fs.existsSync(file)) return false;

    return fs.unlinkSync(file);
  }

const files = manifest.modules[hash(id)] = chunk.files.map(fileToIndex)

_cacheGet(key) {
    let file = Fs.join(this.dir, hash(key));
    if (!fs.existsSync(file)) return false;

    return JSON.parse(fs.readFileSync(file));
  }

_cacheSet(key, value) {
    let file = Fs.join(this.dir, hash(key));
    if (fs.existsSync(file)) fs.unlinkSync(file);
    fs.appendFile(file, JSON.stringify(value), () => {
    });

    return value;
  }