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326 lines
11 KiB
Markdown
326 lines
11 KiB
Markdown
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<h1 align="center">
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<br>
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<br>
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<img width="320" src="media/logo.svg" alt="Chalk">
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<br>
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<br>
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<br>
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</h1>
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> Terminal string styling done right
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[![Coverage Status](https://codecov.io/gh/chalk/chalk/branch/main/graph/badge.svg)](https://codecov.io/gh/chalk/chalk)
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[![npm dependents](https://badgen.net/npm/dependents/chalk)](https://www.npmjs.com/package/chalk?activeTab=dependents)
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[![Downloads](https://badgen.net/npm/dt/chalk)](https://www.npmjs.com/package/chalk)
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[![run on repl.it](https://img.shields.io/badge/Run_on_Replit-f26207?logo=replit&logoColor=white)](https://repl.it/github/chalk/chalk)
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![](media/screenshot.png)
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<br>
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---
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<div align="center">
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<p>
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<p>
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<sup>
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Sindre Sorhus' open source work is supported by the community on <a href="https://github.com/sponsors/sindresorhus">GitHub Sponsors</a>
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</sup>
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</p>
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<sup>Special thanks to:</sup>
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<br>
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<br>
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<a href="https://standardresume.co/tech">
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<img src="https://sindresorhus.com/assets/thanks/standard-resume-logo.svg" width="160">
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</a>
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<br>
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<br>
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<a href="https://retool.com/?utm_campaign=sindresorhus">
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<img src="https://sindresorhus.com/assets/thanks/retool-logo.svg" width="230">
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</a>
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<br>
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<br>
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<a href="https://strapi.io/?ref=sindresorhus">
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<div>
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<img src="https://sindresorhus.com/assets/thanks/strapi-logo-white-bg.png" width="220" alt="Strapi">
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</div>
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<b>Strapi is the leading open-source headless CMS.</b>
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<div>
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<sup>It’s 100% JavaScript, fully customizable, and developer-first.</sup>
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</div>
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</a>
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<br>
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<br>
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<a href="https://www.stackaid.us/?utm_campaign=sindre">
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<div>
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<img src="https://sindresorhus.com/assets/thanks/stackaid-logo.png" width="230" alt="StackAid">
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</div>
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<b>Fund your open source dependencies</b>
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</a>
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<br>
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<br>
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</p>
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</div>
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---
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<br>
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## Highlights
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- Expressive API
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- Highly performant
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- No dependencies
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- Ability to nest styles
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- [256/Truecolor color support](#256-and-truecolor-color-support)
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- Auto-detects color support
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- Doesn't extend `String.prototype`
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- Clean and focused
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- Actively maintained
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- [Used by ~86,000 packages](https://www.npmjs.com/browse/depended/chalk) as of October 4, 2022
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## Install
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```sh
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npm install chalk
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```
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**IMPORTANT:** Chalk 5 is ESM. If you want to use Chalk with TypeScript or a build tool, you will probably want to use Chalk 4 for now. [Read more.](https://github.com/chalk/chalk/releases/tag/v5.0.0)
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## Usage
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```js
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import chalk from 'chalk';
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console.log(chalk.blue('Hello world!'));
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```
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Chalk comes with an easy to use composable API where you just chain and nest the styles you want.
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```js
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import chalk from 'chalk';
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const log = console.log;
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// Combine styled and normal strings
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log(chalk.blue('Hello') + ' World' + chalk.red('!'));
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// Compose multiple styles using the chainable API
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log(chalk.blue.bgRed.bold('Hello world!'));
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// Pass in multiple arguments
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log(chalk.blue('Hello', 'World!', 'Foo', 'bar', 'biz', 'baz'));
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// Nest styles
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log(chalk.red('Hello', chalk.underline.bgBlue('world') + '!'));
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// Nest styles of the same type even (color, underline, background)
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log(chalk.green(
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'I am a green line ' +
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chalk.blue.underline.bold('with a blue substring') +
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' that becomes green again!'
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));
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// ES2015 template literal
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log(`
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CPU: ${chalk.red('90%')}
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RAM: ${chalk.green('40%')}
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DISK: ${chalk.yellow('70%')}
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`);
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// Use RGB colors in terminal emulators that support it.
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log(chalk.rgb(123, 45, 67).underline('Underlined reddish color'));
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log(chalk.hex('#DEADED').bold('Bold gray!'));
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```
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Easily define your own themes:
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```js
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import chalk from 'chalk';
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const error = chalk.bold.red;
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const warning = chalk.hex('#FFA500'); // Orange color
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console.log(error('Error!'));
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console.log(warning('Warning!'));
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```
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Take advantage of console.log [string substitution](https://nodejs.org/docs/latest/api/console.html#console_console_log_data_args):
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```js
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import chalk from 'chalk';
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const name = 'Sindre';
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console.log(chalk.green('Hello %s'), name);
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//=> 'Hello Sindre'
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```
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## API
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### chalk.`<style>[.<style>...](string, [string...])`
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Example: `chalk.red.bold.underline('Hello', 'world');`
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Chain [styles](#styles) and call the last one as a method with a string argument. Order doesn't matter, and later styles take precedent in case of a conflict. This simply means that `chalk.red.yellow.green` is equivalent to `chalk.green`.
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Multiple arguments will be separated by space.
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### chalk.level
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Specifies the level of color support.
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Color support is automatically detected, but you can override it by setting the `level` property. You should however only do this in your own code as it applies globally to all Chalk consumers.
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If you need to change this in a reusable module, create a new instance:
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```js
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import {Chalk} from 'chalk';
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const customChalk = new Chalk({level: 0});
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```
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| Level | Description |
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| :---: | :--- |
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| `0` | All colors disabled |
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| `1` | Basic color support (16 colors) |
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| `2` | 256 color support |
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| `3` | Truecolor support (16 million colors) |
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### supportsColor
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Detect whether the terminal [supports color](https://github.com/chalk/supports-color). Used internally and handled for you, but exposed for convenience.
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Can be overridden by the user with the flags `--color` and `--no-color`. For situations where using `--color` is not possible, use the environment variable `FORCE_COLOR=1` (level 1), `FORCE_COLOR=2` (level 2), or `FORCE_COLOR=3` (level 3) to forcefully enable color, or `FORCE_COLOR=0` to forcefully disable. The use of `FORCE_COLOR` overrides all other color support checks.
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Explicit 256/Truecolor mode can be enabled using the `--color=256` and `--color=16m` flags, respectively.
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### chalkStderr and supportsColorStderr
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`chalkStderr` contains a separate instance configured with color support detected for `stderr` stream instead of `stdout`. Override rules from `supportsColor` apply to this too. `supportsColorStderr` is exposed for convenience.
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### modifierNames, foregroundColorNames, backgroundColorNames, and colorNames
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All supported style strings are exposed as an array of strings for convenience. `colorNames` is the combination of `foregroundColorNames` and `backgroundColorNames`.
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This can be useful if you wrap Chalk and need to validate input:
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```js
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import {modifierNames, foregroundColorNames} from 'chalk';
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console.log(modifierNames.includes('bold'));
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//=> true
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console.log(foregroundColorNames.includes('pink'));
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//=> false
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```
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## Styles
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### Modifiers
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- `reset` - Reset the current style.
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- `bold` - Make the text bold.
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- `dim` - Make the text have lower opacity.
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- `italic` - Make the text italic. *(Not widely supported)*
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- `underline` - Put a horizontal line below the text. *(Not widely supported)*
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- `overline` - Put a horizontal line above the text. *(Not widely supported)*
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- `inverse`- Invert background and foreground colors.
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- `hidden` - Print the text but make it invisible.
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- `strikethrough` - Puts a horizontal line through the center of the text. *(Not widely supported)*
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- `visible`- Print the text only when Chalk has a color level above zero. Can be useful for things that are purely cosmetic.
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### Colors
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- `black`
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- `red`
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- `green`
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- `yellow`
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- `blue`
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- `magenta`
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- `cyan`
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- `white`
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- `blackBright` (alias: `gray`, `grey`)
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- `redBright`
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- `greenBright`
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- `yellowBright`
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- `blueBright`
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- `magentaBright`
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- `cyanBright`
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- `whiteBright`
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### Background colors
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- `bgBlack`
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- `bgRed`
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- `bgGreen`
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- `bgYellow`
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- `bgBlue`
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- `bgMagenta`
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- `bgCyan`
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- `bgWhite`
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- `bgBlackBright` (alias: `bgGray`, `bgGrey`)
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- `bgRedBright`
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- `bgGreenBright`
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- `bgYellowBright`
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- `bgBlueBright`
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- `bgMagentaBright`
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- `bgCyanBright`
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- `bgWhiteBright`
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## 256 and Truecolor color support
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Chalk supports 256 colors and [Truecolor](https://github.com/termstandard/colors) (16 million colors) on supported terminal apps.
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Colors are downsampled from 16 million RGB values to an ANSI color format that is supported by the terminal emulator (or by specifying `{level: n}` as a Chalk option). For example, Chalk configured to run at level 1 (basic color support) will downsample an RGB value of #FF0000 (red) to 31 (ANSI escape for red).
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Examples:
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- `chalk.hex('#DEADED').underline('Hello, world!')`
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- `chalk.rgb(15, 100, 204).inverse('Hello!')`
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Background versions of these models are prefixed with `bg` and the first level of the module capitalized (e.g. `hex` for foreground colors and `bgHex` for background colors).
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- `chalk.bgHex('#DEADED').underline('Hello, world!')`
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- `chalk.bgRgb(15, 100, 204).inverse('Hello!')`
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The following color models can be used:
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- [`rgb`](https://en.wikipedia.org/wiki/RGB_color_model) - Example: `chalk.rgb(255, 136, 0).bold('Orange!')`
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- [`hex`](https://en.wikipedia.org/wiki/Web_colors#Hex_triplet) - Example: `chalk.hex('#FF8800').bold('Orange!')`
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- [`ansi256`](https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit) - Example: `chalk.bgAnsi256(194)('Honeydew, more or less')`
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## Browser support
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Since Chrome 69, ANSI escape codes are natively supported in the developer console.
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## Windows
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If you're on Windows, do yourself a favor and use [Windows Terminal](https://github.com/microsoft/terminal) instead of `cmd.exe`.
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## Origin story
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[colors.js](https://github.com/Marak/colors.js) used to be the most popular string styling module, but it has serious deficiencies like extending `String.prototype` which causes all kinds of [problems](https://github.com/yeoman/yo/issues/68) and the package is unmaintained. Although there are other packages, they either do too much or not enough. Chalk is a clean and focused alternative.
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## Related
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- [chalk-template](https://github.com/chalk/chalk-template) - [Tagged template literals](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals#tagged_templates) support for this module
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- [chalk-cli](https://github.com/chalk/chalk-cli) - CLI for this module
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- [ansi-styles](https://github.com/chalk/ansi-styles) - ANSI escape codes for styling strings in the terminal
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- [supports-color](https://github.com/chalk/supports-color) - Detect whether a terminal supports color
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- [strip-ansi](https://github.com/chalk/strip-ansi) - Strip ANSI escape codes
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- [strip-ansi-stream](https://github.com/chalk/strip-ansi-stream) - Strip ANSI escape codes from a stream
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- [has-ansi](https://github.com/chalk/has-ansi) - Check if a string has ANSI escape codes
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- [ansi-regex](https://github.com/chalk/ansi-regex) - Regular expression for matching ANSI escape codes
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- [wrap-ansi](https://github.com/chalk/wrap-ansi) - Wordwrap a string with ANSI escape codes
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- [slice-ansi](https://github.com/chalk/slice-ansi) - Slice a string with ANSI escape codes
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- [color-convert](https://github.com/qix-/color-convert) - Converts colors between different models
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- [chalk-animation](https://github.com/bokub/chalk-animation) - Animate strings in the terminal
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- [gradient-string](https://github.com/bokub/gradient-string) - Apply color gradients to strings
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- [chalk-pipe](https://github.com/LitoMore/chalk-pipe) - Create chalk style schemes with simpler style strings
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- [terminal-link](https://github.com/sindresorhus/terminal-link) - Create clickable links in the terminal
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## Maintainers
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- [Sindre Sorhus](https://github.com/sindresorhus)
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- [Josh Junon](https://github.com/qix-)
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