@silva97/ansi

This package implements a tag function to parse template strings and add ANSI escape sequences to use colors and text styles on terminal. (read about template strings)

// Example
const { ansi } = require('@silva97/ansi');

console.log(ansi`%{f.green}Hello %{f.red;bold;under}World!`);

Output:

Installation

npm install @silva97/ansi
# Or using yarn:
yarn add @silva97/ansi

ansi tags

The ansi tags follows the format %{...}, it's similar to notation ${...} of template strings to expands the content of an expression on the string. But ansi tags is used to output ANSI escapes.

The color name is specified using the format mode.color. Example f.blue will be set the foreground color to blue.

Mode	ANSI code	Description
f	3	Foreground color
F	9	Light foreground color
b	4	Background color

---

Color	ANSI code
black	0
red	1
green	2
yellow	3
blue	4
violet	5
purple	5
cyan	6
white	7

You can also specify styles to text. Example: %{bold;strike}Hello!.

Style	ANSI code	Description
normal	0	Resets to normal style
bold	1	Bold text
italic	3	Italic text
under	4	underline text
blink	5	Blinks the text
invert	7	Inverts background and foreground colors
strike	9	strike text

Warning: Some styles, like blink and strike, will not work on all terminals. (i.e. VS code integrated terminal)

Note: You can also specify the style numbers instead of the names. Example: %{31;1} will be translated to \x1b[31;1m (same as %{f.red;bold}).

It's yet template strings!

Using ansi tag function you can yet use ${} expressions inside yours strings. Example:

const { ansi } = require('@silva97/ansi');

const name = 'Luiz Felipe';

console.log(ansi`Your name is %{f.green;bold}${name}%{normal}!`);

You can easy disable colors!

You can simple disable the colors of the output if you set ansi.enabled to false. For example:

const { ansi } = require('@silva97/ansi');

ansi.enabled = false;
const name = 'Luiz Felipe';

console.log(ansi`Your name is %{f.green;bold}${name}%{normal}!`);
// Output: "Your name is Luiz Felipe!"

It's will print the text without colors.

Purify text from ANSI escapes

If you previous has been escaped an text, but need the raw text back. You just need to use the purify() function and it will remove all ANSI escapes from the text.

const { ansi, purify } = require('@silva97/ansi');

const name = 'Luiz Felipe';
const welcome = ansi`Your name is %{f.green;bold}${name}%{normal}!`;

console.log(welcome);         // Colored text
console.log(purify(welcome)); // Normal text