citty

Elegant CLI Builder

• Fast and lightweight argument parser based on mri
• Smart value parsing with typecast, boolean shortcuts and unknown flag handling
• Nested sub-commands
• Lazy and Async commands
• Pluggable and composable API
• Auto generated usage and help

🚧 This project is under heavy development. More features are coming soon!

Usage

Install package:

# npm
npm install citty

# yarn
yarn add citty

# pnpm
pnpm install citty

Import:

// ESM
import { defineCommand, runMain } from "citty";

// CommonJS
const { defineCommand, runMain } = require("citty");

Define main command to run:

import { defineCommand, runMain } from "citty";

const main = defineCommand({
  meta: {
    name: "hello",
    version: "1.0.0",
    description: "My Awesome CLI App",
  },
  args: {
    name: {
      type: "positional",
      description: "Your name",
      required: true,
    },
    friendly: {
      type: "boolean",
      description: "Use friendly greeting",
    },
  },
  run({ args }) {
    console.log(`${args.friendly ? "Hi" : "Greetings"} ${args.name}!`);
  },
});

runMain(main);

Utils

defineCommand

defineCommand is a type helper for defining commands.

runMain

Runs a command with usage support and graceful error handling.

createMain

Create a wrapper around command that calls runMain when called.

runCommand

Parses input args and runs command and sub-commands (unsupervised). You can access result key from returnd/awaited value to access command's result.

parseArgs

Parses input arguments and applies defaults.

renderUsage

Renders command usage to a string value.

showUsage

Renders usage and prints to the console

Development

• Clone this repository
• Install latest LTS version of Node.js
• Enable Corepack using corepack enable
• Install dependencies using pnpm install
• Run interactive tests using pnpm dev

License

Made with 💛 Published under MIT License.

Argument parser is based on lukeed/mri by Luke Edwards (@lukeed).