ultraflag

A 730B library for parsing CLI flags. Inspired by Deno's std flags module.

Features

• It's very small.
• It's very fast.
• It's a nicer API (and faster!) than parseArgs from node:util.

Usage

Basic usage does not require any configuration.

import { parse } from "ultraflag";

// my-cli build --bundle -rf --a value --b=value --c 1
const argv = process.argv.slice(2);
const args = parse(argv);

console.log(args);
// { _: ['build'], bundle: true, r: true, f: true, a: "value", b: "value", c: 1 }

Parsing can be configured to ensure values are handled in a certain format.

const args = parse(argv, {
  default: { a: 1, b: 2, c: "value" },
  alias: { h: "help" },
  boolean: ["foo", "bar"],
  string: ["baz", "qux"],
  array: ["input"],
});

Benchmarks

mri           x 1,650,986 ops/sec ±0.32% (97 runs sampled)
ultraflag     x 1,407,191 ops/sec ±0.38% (99 runs sampled)
minimist      x 383,506 ops/sec ±0.28% (99 runs sampled)
node:util     x 320,953 ops/sec ±0.35% (98 runs sampled)
yargs-parser  x 31,874 ops/sec ±1.32% (92 runs sampled)