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readme.md

chalk

Terminal string styling done right

Build Status

colors.js is currently the most popular string styling module, but it has serious deficiencies like extending String.prototype which causes all kinds of problems. Although there are other ones, they either do too much or not enough.

Chalk is a clean and focused alternative.

screenshot

Why

  • Highly performant
  • Doesn’t extend String.prototype
  • Expressive API
  • Ability to nest styles
  • Clean and focused
  • Auto-detects color support
  • Actively maintained
  • Used by 1000+ modules

Install

$ npm install --save chalk

Usage

Chalk comes with an easy to use composable API where you just chain and nest the styles you want.

var chalk = require('chalk');

// style a string
console.log(  chalk.blue('Hello world!')  );

// combine styled and normal strings
console.log(  chalk.blue('Hello'), 'World' + chalk.red('!')  );

// compose multiple styles using the chainable API
console.log(  chalk.blue.bgRed.bold('Hello world!')  );

// pass in multiple arguments
console.log(  chalk.blue('Hello', 'World!', 'Foo', 'bar', 'biz', 'baz')  );

// nest styles
console.log(  chalk.red('Hello', chalk.underline.bgBlue('world') + '!')  );

// nest styles of the same type even (color, underline, background)
console.log(  chalk.green('I am a green line ' + chalk.blue('with a blue substring') + ' that becomes green again!')  );

Easily define your own themes.

var chalk = require('chalk');
var error = chalk.bold.red;
console.log(error('Error!'));

Take advantage of console.log string substitution.

var name = 'Sindre';
console.log(chalk.green('Hello %s'), name);
//=> Hello Sindre

API

chalk.<style>[.<style>...](string, [string...])

Example: chalk.red.bold.underline('Hello', 'world');

Chain styles and call the last one as a method with a string argument. Order doesn’t matter.

Multiple arguments will be separated by space.

chalk.enabled

Color support is automatically detected, but you can override it.

chalk.supportsColor

Detect whether the terminal supports color.

Can be overridden by the user with the flags --color and --no-color.

Used internally and handled for you, but exposed for convenience.

chalk.styles

Exposes the styles as ANSI escape codes.

Generally not useful, but you might need just the .open or .close escape code if you’re mixing externally styled strings with yours.

var chalk = require('chalk');

console.log(chalk.styles.red);
//=> {open: '\u001b[31m', close: '\u001b[39m'}

console.log(chalk.styles.red.open + 'Hello' + chalk.styles.red.close);

chalk.hasColor(string)

Check whether a string has color.

chalk.stripColor(string)

Strip color from a string.

Can be useful in combination with .supportsColor to strip color on externally styled text when it’s not supported.

Example:

var chalk = require('chalk');
var styledString = getText();

if (!chalk.supportsColor) {
	styledString = chalk.stripColor(styledString);
}

Styles

General

  • reset
  • bold
  • dim
  • italic (not widely supported)
  • underline
  • inverse
  • hidden
  • strikethrough (not widely supported)

Text colors

  • black
  • red
  • green
  • yellow
  • blue
  • magenta
  • cyan
  • white
  • gray

Background colors

  • bgBlack
  • bgRed
  • bgGreen
  • bgYellow
  • bgBlue
  • bgMagenta
  • bgCyan
  • bgWhite

License

MIT © Sindre Sorhus