ultraflag

A <1kB library for parsing CLI flags. Inspired by Deno's std flags module.

$3

🤏 very small

🍃 very simple

🏃 very fast (beats node:util)

🔏 strongly typed

$3

Basic usage does not require any configuration.

``js
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 arguments are coerced to specific types, which enhances type safety.

`js
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)
``