JarCastingansi-colors 
Easily add ANSI colors to your text and symbols in the terminal. A faster drop-in replacement for chalk, kleur and turbocolor (without the dependencies and rendering bugs).
Please consider following this project's author, Brian Woodward, and consider starring the project to show your
Install
Install with npm:
$ npm install --save ansi-colors
Why use this?
ansi-colors is the fastest Node.js library for terminal styling. A more performant drop-in replacement for chalk, with no dependencies.
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Blazing fast - Fastest terminal styling library in node.js, 10-20x faster than chalk!
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Drop-in replacement for chalk.
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No dependencies (Chalk has 7 dependencies in its tree!)
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Safe - Does not modify the
String.prototypelike colors. -
Supports nested colors, and does not have the nested styling bug that is present in colorette, chalk, and kleur.
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Supports chained colors.
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Toggle color support on or off.
Usage
const c = require('ansi-colors');
console.log(c.red('This is a red string!'));
console.log(c.green('This is a red string!'));
console.log(c.cyan('This is a cyan string!'));
console.log(c.yellow('This is a yellow string!'));
Chained colors
console.log(c.bold.red('this is a bold red message'));
console.log(c.bold.yellow.italic('this is a bold yellow italicized message'));
console.log(c.green.bold.underline('this is a bold green underlined message'));
Nested colors
console.log(c.yellow(`foo ${c.red.bold('red')} bar ${c.cyan('cyan')} baz`));
Nested styling bug
ansi-colors does not have the nested styling bug found in colorette, chalk, and kleur.
const { bold, red } = require('ansi-styles');
console.log(bold(`foo ${red.dim('bar')} baz`));
const colorette = require('colorette');
console.log(colorette.bold(`foo ${colorette.red(colorette.dim('bar'))} baz`));
const kleur = require('kleur');
console.log(kleur.bold(`foo ${kleur.red.dim('bar')} baz`));
const chalk = require('chalk');
console.log(chalk.bold(`foo ${chalk.red.dim('bar')} baz`));
Results in the following
(sans icons and labels)
Toggle color support
Easily enable/disable colors.
const c = require('ansi-colors');
// disable colors manually
c.enabled = false;
// or use a library to automatically detect support
c.enabled = require('color-support').hasBasic;
console.log(c.red('I will only be colored red if the terminal supports colors'));
Strip ANSI codes
Use the .unstyle method to strip ANSI codes from a string.
console.log(c.unstyle(c.blue.bold('foo bar baz')));
//=> 'foo bar baz'
Available styles
Note that bright and bright-background colors are not always supported.
| Colors | Background Colors | Bright Colors | Bright Background Colors |
|---|---|---|---|
| black | bgBlack | blackBright | bgBlackBright |
| red | bgRed | redBright | bgRedBright |
| green | bgGreen | greenBright | bgGreenBright |
| yellow | bgYellow | yellowBright | bgYellowBright |
| blue | bgBlue | blueBright | bgBlueBright |
| magenta | bgMagenta | magentaBright | bgMagentaBright |
| cyan | bgCyan | cyanBright | bgCyanBright |
| white | bgWhite | whiteBright | bgWhiteBright |
| gray | |||
| grey |
(gray is the U.S. spelling, grey is more commonly used in the Canada and U.K.)
Style modifiers
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dim
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bold
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hidden
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italic
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underline
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inverse
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strikethrough -
reset
Aliases
Create custom aliases for styles.
const colors = require('ansi-colors');
colors.alias('primary', colors.yellow);
colors.alias('secondary', colors.bold);
console.log(colors.primary.secondary('Foo'));
Themes
A theme is an object of custom aliases.
const colors = require('ansi-colors');
colors.theme({
danger: colors.red,
dark: colors.dim.gray,
disabled: colors.gray,
em: colors.italic,
heading: colors.bold.underline,
info: colors.cyan,
muted: colors.dim,
primary: colors.blue,
strong: colors.bold,
success: colors.green,
underline: colors.underline,
warning: colors.yellow
});
// Now, we can use our custom styles alongside the built-in styles!
console.log(colors.danger.strong.em('Error!'));
console.log(colors.warning('Heads up!'));
console.log(colors.info('Did you know...'));
console.log(colors.success.bold('It worked!'));
Performance
Libraries tested
- ansi-colors v3.0.4
- chalk v2.4.1
Mac
MacBook Pro, Intel Core i7, 2.3 GHz, 16 GB.
Load time
Time it takes to load the first time require() is called:
- ansi-colors -
1.915ms - chalk -
12.437ms
Benchmarks
# All Colors
ansi-colors x 173,851 ops/sec ±0.42% (91 runs sampled)
chalk x 9,944 ops/sec ±2.53% (81 runs sampled)))
# Chained colors
ansi-colors x 20,791 ops/sec ±0.60% (88 runs sampled)
chalk x 2,111 ops/sec ±2.34% (83 runs sampled)
# Nested colors
ansi-colors x 59,304 ops/sec ±0.98% (92 runs sampled)
chalk x 4,590 ops/sec ±2.08% (82 runs sampled)
Windows
Windows 10, Intel Core i7-7700k CPU @ 4.2 GHz, 32 GB
Load time
Time it takes to load the first time require() is called:
- ansi-colors -
1.494ms - chalk -
11.523ms
Benchmarks
# All Colors
ansi-colors x 193,088 ops/sec ±0.51% (95 runs sampled))
chalk x 9,612 ops/sec ±3.31% (77 runs sampled)))
# Chained colors
ansi-colors x 26,093 ops/sec ±1.13% (94 runs sampled)
chalk x 2,267 ops/sec ±2.88% (80 runs sampled))
# Nested colors
ansi-colors x 67,747 ops/sec ±0.49% (93 runs sampled)
chalk x 4,446 ops/sec ±3.01% (82 runs sampled))
About
Contributing
Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
Running Tests
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
$ npm install && npm test
Building docs
(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)
To generate the readme, run the following command:
$ npm install -g verbose/verb#dev verb-generate-readme && verb
Related projects
You might also be interested in these projects:
- ansi-wrap: Create ansi colors by passing the open and close codes. | homepage
- strip-color: Strip ANSI color codes from a string. No dependencies. | homepage
Contributors
| Commits | Contributor |
|---|---|
| 48 | jonschlinkert |
| 42 | doowb |
| 6 | lukeed |
| 2 | Silic0nS0ldier |
| 1 | dwieeb |
| 1 | jorgebucaran |
| 1 | madhavarshney |
| 1 | chapterjason |
Author
Brian Woodward
License
Copyright © 2019, Brian Woodward. Released under the MIT License.
This file was generated by verb-generate-readme, v0.8.0, on July 01, 2019.