The fastest Node.js library for formatting terminal text with ANSI colors~!
Features
As of v3.0
the Chalk-style syntax (magical getter) is no longer used.
If you need or require that syntax, consider using ansi-colors
, which maintains chalk
parity.
Install
$ npm install --save kleur
Usage
const { red, white, blue, bold } = require('kleur');
red('red text');
blue().bold().underline('howdy partner');
bold(`${ white().bgRed('[ERROR]') } ${ red().italic('Something happened')}`);
Chained Methods
console.log(bold().red('this is a bold red message'));
console.log(bold().italic('this is a bold italicized message'));
console.log(bold().yellow().bgRed().italic('this is a bold yellow italicized message'));
console.log(green().bold().underline('this is a bold green underlined message'));
Nested Methods
const { yellow, red, cyan } = require('kleur');
console.log(yellow(`foo ${red().bold('red')} bar ${cyan('cyan')} baz`));
console.log(yellow('foo ' + red().bold('red') + ' bar ' + cyan('cyan') + ' baz'));
Conditional Support
Toggle color support as needed; kleur
includes simple auto-detection which may not cover all cases.
const kleur = require('kleur');
kleur.enabled = false;
kleur.enabled = require('color-support').level;
console.log(kleur.red('I will only be colored red if the terminal supports colors'));
API
Any kleur
method returns a String
when invoked with input; otherwise chaining is expected.
It's up to the developer to pass the output to destinations like console.log
, process.stdout.write
, etc.
The methods below are grouped by type for legibility purposes only. They each can be chained or nested with one another.
Colors:
black — red — green — yellow — blue — magenta — cyan — white — gray
Backgrounds:
bgBlack — bgRed — bgGreen — bgYellow — bgBlue — bgMagenta — bgCyan — bgWhite
Modifiers:
reset — bold — dim — italic* — underline — inverse — hidden — strikethrough*
* Not widely supported
Benchmarks
Using Node v10.13.0
Load time
chalk: 9.397ms
kleur: 0.525ms
ansi-colors: 1.200ms
Performance
# All Colors
ansi-colors x 210,244 ops/sec ±0.36% (94 runs sampled)
chalk x 11,999 ops/sec ±2.08% (84 runs sampled)
kleur x 442,028 ops/sec ±0.26% (95 runs sampled)
# Stacked colors
ansi-colors x 25,117 ops/sec ±0.33% (92 runs sampled)
chalk x 2,602 ops/sec ±1.87% (84 runs sampled)
kleur x 40,395 ops/sec ±0.41% (95 runs sampled)
# Nested colors
ansi-colors x 77,423 ops/sec ±0.26% (95 runs sampled)
chalk x 5,705 ops/sec ±1.48% (87 runs sampled)
kleur x 114,039 ops/sec ±0.44% (95 runs sampled)
Credits
This project originally forked Brian Woodward's awesome ansi-colors
library.
Beginning with kleur@3.0
, the Chalk-style syntax (magical getter) has been replaced with function calls per key:
c.red.bold.underline('old');
c.red().bold().underline('new');
As I work more with Rust, the newer syntax feels so much better & more natural!
If you prefer the old syntax, you may migrate to ansi-colors
... or suffer the deprecation notice on older kleur
versions :sweat_smile:
License
MIT © Luke Edwards