crypto.randomFillSync(buffer[, offset][, size])

const buf = Buffer.alloc(10);
console.log(crypto.randomFillSync(buf).toString('hex'));

crypto.randomFillSync(buf, 5);
console.log(buf.toString('hex'));

// The above is equivalent to the following:
crypto.randomFillSync(buf, 5, 5);
console.log(buf.toString('hex'));

const a = new Uint32Array(10);
console.log(
  Buffer.from(
    crypto.randomFillSync(a).buffer,
    a.byteOffset,
    a.byteLength,
  ).toString('hex'),
);

const b = new Float64Array(10);
console.log(
  Buffer.from(
    crypto.randomFillSync(b).buffer,
    b.byteOffset,
    b.byteLength,
  ).toString('hex'),
);

const c = new DataView(new ArrayBuffer(10));
console.log(
  Buffer.from(
    crypto.randomFillSync(c).buffer,
    c.byteOffset,
    c.byteLength,
  ).toString('hex'),
);