ansi-es6

A small ES6 module utility library for creating ANSI escaped strings. Primarily useful for highlighting text with colors. Which colors are displayed and which codes are actually supported depends on the terminal being used.

Installing

The module can be installed from npm:

npm install ansi-es6

Usage

The main function exposed by the module is modify, which takes a string and a list of modifiers as arguments and returns a new string in which the modifiers are applied at the beginning and all modifiers are reset at the end (this means the output cannot easily be nested in an already modified string).

Many of the common codes are provided as constants:

• Foreground colors, e.g. FgGreen, FgBrightRed, etc.
• Background colors, e.g. BgGreen, BgBrightRed, etc.
• Styles, e.g. Italic, Bold, Underline, etc.

import { modify, FgGreen } from 'ansi-es6';

console.log(modify('Hello Green World', FgGreen));

There also is the function code which creates arbitrary escaped strings from numerical codes; most relevant codes should already exist in the form of the various constants however.

Custom Colors

The functions FgRgb and BgRgb create foreground/background modifiers which correspond to arbitrary RGB color values. There are equivalent functions for HSL (which ultimately is converted to RGB).

import { modify, FgHsl } from 'ansi-es6';

// Print a rainbow
for (let h = 0; h < 359; h++)
	console.log(modify("Hello Console", FgHsl(h, 1, 0.5)));

Types and API Documentation

Type declarations (.d.ts) are provided by the module; these also contain function/argument descriptions. The constants for the most part are currently not documented but you can look up the codes on Wikipedia for example.