🎨 Use a color theme for your code's terminal output.

A color theme enforces consistency and simplifies updating styles.

Your code specifies the default theme: styles and categories associated to them. Users can then optionally override it.

This supports 256 colors, Truecolor and terminal colors detection, thanks to chalk.

Example

import terminalTheme from 'terminal-theme'

// Any category/key is possible
const defaultTheme = {
  error: 'red bold',
  success: 'green',
  title: 'white bold',
  // Truecolor is supported
  subtitle: 'rgb-150-100-100',
}
const { error, success, title, subtitle } = await terminalTheme(defaultTheme)
console.log(success('example')) // Print in green color

User theme

Users can override the defaultTheme by creating a terminal-theme.yml in the current or any parent directory.

error: yellow bold
success: cyan

Or programmatically:

const { error, success, title, subtitle } = await terminalTheme({
  ...defaultTheme,
  ...userTheme,
})
console.log(success('example'))

Install

npm install terminal-theme

This package works in Node.js >=18.18.0.

This is an ES module. It must be loaded using an import or import() statement, not require(). If TypeScript is used, it must be configured to output ES modules, not CommonJS.

API

terminalTheme(defaultTheme, options?)

defaultTheme: object
options: object
Return value: Promise<object>

defaultTheme

The defaultTheme argument is an object where each:

• Key is a category with consistent styles. Examples include error, success, link, header, etc.
• Value is a space-separated list of styles. Some styles require dash-separated arguments.

const defaultTheme = {
  // Single style, without arguments
  success: 'green',
  // Single style, with arguments
  warning: 'rgb-226-126-26',
  // Multiple styles
  error: 'red bold',
}

Return value

The return value is a promise resolving to an object where each:

• Key is a category defined in the theme.
• Value is a function applying styles to a string.

const { error, success } = await terminalTheme({
  error: 'red',
  success: 'green',
})
console.log(success('example'))

options

colors

Type: boolean
Default: undefined

Whether colors should be enabled/disabled, regardless of terminal support. Colors support is automatically detected, so this is only meant to override that default behavior.

stream

Type: Stream
Default: process.stdout

Stream used to detect colors support. This should be the file or terminal where the colors are output.

cwd

Type: string
Default: process.cwd()

Current directory. Used when looking for terminal-theme.yml.

Available styles

# Standard styles
bold underline inverse reset

# Those styles do not always work on Windows
dim italic hidden strikethrough

# Hidden when the terminal does not support colors
visible

# Basic colors
black red green yellow blue magenta cyan white gray
blackBright redBright greenBright yellowBright blueBright
magentaBright cyanBright whiteBright

# Advanced colors
hex-ffffff
rgb-255-255-255

# Background colors
bgBlack bgRed bgGreen bgYellow bgBlue bgMagenta bgCyan bgWhite bgGray
bgBlackBright bgRedBright bgGreenBright bgYellowBright bgBlueBright
bgMagentaBright bgCyanBright bgWhiteBright
bgHex-* bgRgb-*

Related projects

• colors-option: Let users toggle colors.
• chalk-string: Chalk with style strings.

Support

For any question, don't hesitate to submit an issue on GitHub.

Everyone is welcome regardless of personal background. We enforce a Code of conduct in order to promote a positive and inclusive environment.

Contributing

This project was made with ❤️. The simplest way to give back is by starring and sharing it online.

If the documentation is unclear or has a typo, please click on the page's Edit button (pencil icon) and suggest a correction.

If you would like to help us fix a bug or add a new feature, please check our guidelines. Pull requests are welcome!