Clerc is a full-featured library (tool set) for building CLI Apps in Node.js, Deno or Bun.

---

• ✨ Features
• 😊 The simplest CLI example
• 📖 Documentation
• 🦄 Examples
• 🤔 More...

Note

This package is ESM-only.

✨ Features

• Lightweight - Dependencies are bundled and minified
• Plugin system - Add rich features on demand.
• Chainable APIs - Composable.
• Developer friendly - Strongly typed, converts flags and parameters to camelCase.
• Parses parameters - No need to read them by yourself.
• I18N - Easy to change different locales.

😊 The simplest CLI example

Install clerc, and create a file named cli.mjs:

import { Clerc } from "clerc";

Clerc.create(
	"foo", // CLI Name
	"A foo CLI", // CLI Description
	"0.0.0", // CLI Version
)
	.command(
		"bar", // Command name
		"A bar command", // Command description
	)
	.on(
		"bar",
		(
			_ctx, // The command context, but we haven't used it yet
		) => {
			console.log("Hello, world from Clerc.js!");
		},
	)
	.parse(); // Parse the arguments and run!

Then run: node cli.mjs bar. It should log in your shell: Hello, world from Clerc.js!

📖 Documentation

Please see https://clerc.js.org.

🦄 Examples

Check the examples made with Clerc.js:

• Greeting - The example from above
• Bumpp - Reimplementation of Bumpp's CLI

🤔 More...

Why using Clerc?

Clerc uses type-flag to parse arguments. It is strongly-typed, which brings you better DX. It is powerful(supports custom type) and quite small!

And clerc uses lite-emit to emit events. It is a event emitter library but with better type support.

The whole bundled and minified @clerc/core package is only 10KB (ignored types), which is much smaller than yargs, commander, CAC and oclif :)

Why naming "Clerc"?

Hiroki Osame's cleye is an awesome tool for building CLI apps. Its name sounds quite nice, so I also found an English name Clerc for this package =)

📝 License

MIT. Made with ❤️ by Ray