🥪 Breadc

Yet another Command Line Application Framework desgined for TypeScript.

• TypeScript Infer: infer command arguments, option values, and action signatures in IDE automatically
• Command: support default command, command alias, and nested sub-commands like git remote add <name> <url>
• Group: organize commands by modules and build large multi-command CLI applications with clear structure
• Option: support boolean, required, optional, spread options, --no-* negation, and -- passthrough arguments
• Middleware: support middleware pipeline and unknown option handling
• Builtin CLI Features: provide common help / version options and i18n support out of the box

Installation

npm i @breadc/core

Usage

Try ./examples/echo.ts.

import { breadc } from '@breadc/core';

const cli = breadc('echo', { version: '1.0.0' })
  .option('--host <host>', 'specify hostname', { initial: 'localhost' })
  .option('--port <port>', 'specify port', { initial: '3000', cast: (t) => +t });

cli.command('[message]', 'Say something!').action((message, option) => {
  console.log(message ?? 'You can say anything!');
  const { host, port } = option; // { host: string, port: number, '--': string[] }
  console.log(`Host: ${host}`);
  console.log(`Port: ${port}`);
});

cli.run(process.argv.slice(2)).catch((err) => console.error(err));

If you are using IDEs that support TypeScript (like Visual Studio Code), input something using option, and then you will find the option is automatically typed with { host: string, port: number }. In the figure below, Visual Studio Code will automatically infer that the type of option.host is string and the type of option.port is number.

Inspiration

• cac: Simple yet powerful framework for building command-line apps.
• Commander.js: Node.js command-line interfaces made easy.
• TypeScript: Documentation - Template Literal Types

License

MIT License © 2023 XLor