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<p align="center"> | |
<img width="250" src="https://raw.githubusercontent.com/yargs/yargs/main/yargs-logo.png"> | |
</p> | |
<h1 align="center"> Yargs </h1> | |
<p align="center"> | |
<b >Yargs be a node.js library fer hearties tryin' ter parse optstrings</b> | |
</p> | |
<br> | |
 | |
[![NPM version][npm-image]][npm-url] | |
[![js-standard-style][standard-image]][standard-url] | |
[![Coverage][coverage-image]][coverage-url] | |
[![Conventional Commits][conventional-commits-image]][conventional-commits-url] | |
[![Slack][slack-image]][slack-url] | |
## Description | |
Yargs helps you build interactive command line tools, by parsing arguments and generating an elegant user interface. | |
It gives you: | |
* commands and (grouped) options (`my-program.js serve --port=5000`). | |
* a dynamically generated help menu based on your arguments: | |
``` | |
mocha [spec..] | |
Run tests with Mocha | |
Commands | |
mocha inspect [spec..] Run tests with Mocha [default] | |
mocha init <path> create a client-side Mocha setup at <path> | |
Rules & Behavior | |
--allow-uncaught Allow uncaught errors to propagate [boolean] | |
--async-only, -A Require all tests to use a callback (async) or | |
return a Promise [boolean] | |
``` | |
* bash-completion shortcuts for commands and options. | |
* and [tons more](/docs/api.md). | |
## Installation | |
Stable version: | |
```bash | |
npm i yargs | |
``` | |
Bleeding edge version with the most recent features: | |
```bash | |
npm i yargs@next | |
``` | |
## Usage | |
### Simple Example | |
```javascript | |
#!/usr/bin/env node | |
const yargs = require('yargs/yargs') | |
const { hideBin } = require('yargs/helpers') | |
const argv = yargs(hideBin(process.argv)).argv | |
if (argv.ships > 3 && argv.distance < 53.5) { | |
console.log('Plunder more riffiwobbles!') | |
} else { | |
console.log('Retreat from the xupptumblers!') | |
} | |
``` | |
```bash | |
$ ./plunder.js --ships=4 --distance=22 | |
Plunder more riffiwobbles! | |
$ ./plunder.js --ships 12 --distance 98.7 | |
Retreat from the xupptumblers! | |
``` | |
> Note: `hideBin` is a shorthand for [`process.argv.slice(2)`](https://nodejs.org/en/knowledge/command-line/how-to-parse-command-line-arguments/). It has the benefit that it takes into account variations in some environments, e.g., [Electron](https://github.com/electron/electron/issues/4690). | |
### Complex Example | |
```javascript | |
#!/usr/bin/env node | |
const yargs = require('yargs/yargs') | |
const { hideBin } = require('yargs/helpers') | |
yargs(hideBin(process.argv)) | |
.command('serve [port]', 'start the server', (yargs) => { | |
return yargs | |
.positional('port', { | |
describe: 'port to bind on', | |
default: 5000 | |
}) | |
}, (argv) => { | |
if (argv.verbose) console.info(`start server on :${argv.port}`) | |
serve(argv.port) | |
}) | |
.option('verbose', { | |
alias: 'v', | |
type: 'boolean', | |
description: 'Run with verbose logging' | |
}) | |
.parse() | |
``` | |
Run the example above with `--help` to see the help for the application. | |
## Supported Platforms | |
### TypeScript | |
yargs has type definitions at [@types/yargs][type-definitions]. | |
``` | |
npm i @types/yargs --save-dev | |
``` | |
See usage examples in [docs](/docs/typescript.md). | |
### Deno | |
As of `v16`, `yargs` supports [Deno](https://github.com/denoland/deno): | |
```typescript | |
import yargs from 'https://deno.land/x/yargs/deno.ts' | |
import { Arguments } from 'https://deno.land/x/yargs/deno-types.ts' | |
yargs(Deno.args) | |
.command('download <files...>', 'download a list of files', (yargs: any) => { | |
return yargs.positional('files', { | |
describe: 'a list of files to do something with' | |
}) | |
}, (argv: Arguments) => { | |
console.info(argv) | |
}) | |
.strictCommands() | |
.demandCommand(1) | |
.parse() | |
``` | |
### ESM | |
As of `v16`,`yargs` supports ESM imports: | |
```js | |
import yargs from 'yargs' | |
import { hideBin } from 'yargs/helpers' | |
yargs(hideBin(process.argv)) | |
.command('curl <url>', 'fetch the contents of the URL', () => {}, (argv) => { | |
console.info(argv) | |
}) | |
.demandCommand(1) | |
.parse() | |
``` | |
### Usage in Browser | |
See examples of using yargs in the browser in [docs](/docs/browser.md). | |
## Community | |
Having problems? want to contribute? join our [community slack](http://devtoolscommunity.herokuapp.com). | |
## Documentation | |
### Table of Contents | |
* [Yargs' API](/docs/api.md) | |
* [Examples](/docs/examples.md) | |
* [Parsing Tricks](/docs/tricks.md) | |
* [Stop the Parser](/docs/tricks.md#stop) | |
* [Negating Boolean Arguments](/docs/tricks.md#negate) | |
* [Numbers](/docs/tricks.md#numbers) | |
* [Arrays](/docs/tricks.md#arrays) | |
* [Objects](/docs/tricks.md#objects) | |
* [Quotes](/docs/tricks.md#quotes) | |
* [Advanced Topics](/docs/advanced.md) | |
* [Composing Your App Using Commands](/docs/advanced.md#commands) | |
* [Building Configurable CLI Apps](/docs/advanced.md#configuration) | |
* [Customizing Yargs' Parser](/docs/advanced.md#customizing) | |
* [Bundling yargs](/docs/bundling.md) | |
* [Contributing](/contributing.md) | |
## Supported Node.js Versions | |
Libraries in this ecosystem make a best effort to track | |
[Node.js' release schedule](https://nodejs.org/en/about/releases/). Here's [a | |
post on why we think this is important](https://medium.com/the-node-js-collection/maintainers-should-consider-following-node-js-release-schedule-ab08ed4de71a). | |
[npm-url]: https://www.npmjs.com/package/yargs | |
[npm-image]: https://img.shields.io/npm/v/yargs.svg | |
[standard-image]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg | |
[standard-url]: http://standardjs.com/ | |
[conventional-commits-image]: https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg | |
[conventional-commits-url]: https://conventionalcommits.org/ | |
[slack-image]: http://devtoolscommunity.herokuapp.com/badge.svg | |
[slack-url]: http://devtoolscommunity.herokuapp.com | |
[type-definitions]: https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/yargs | |
[coverage-image]: https://img.shields.io/nycrc/yargs/yargs | |
[coverage-url]: https://github.com/yargs/yargs/blob/main/.nycrc |