cli-dye

Lightweight and minimal method to dye and color logs in the node CLI. Zero dependencies, tiny file-size, flexible use.

Install

npm i cli-dye

Imports

cli-dye comes with four imports

• color - Converts strings to an ANSI escape color sequence
• dyeStr - Adds ANSI escape color sequence before string then appends a reset color at the end of the string
• dyeLog - Combines dyeStr with a console.log
• Dye - Contains methods to create color logs with a similar syntax to the chalk node package like new Dye().red('text')

color

First Parameter string

The first parameter is a string that determines the color part of the ANSI escape code. The strings are not case sensitive. The following color options are available:

• "black"
• "red"
• "green"
• "yellow"
• "blue"
• "magenta"
• "cyan"
• "white"

The string can also include "background", abbreviated "bg", as well as "bright" / "bold", abbreviated as "br." This allows combinations like "boldblack", "brightred", "brgreen", "backgroundyellow", and "bgblue."

If the color code is invalid, the escape code will fall back on a reset.

Second Parameter string | Array

The second parameter is additional decorations that can be added to text that are not included in the ANSI color escape code. The additional options are "bold", "underline" / "und", and "reversed" / "rev." The decorations parameter can be either a string like "underrev" and "bold,underline" or an array like ["rev", "und"].

Sometimes these decorations are not needed or redundant, so this is an optional parameter.

Example

import { color } from 'cli-dye';

const red = color('red');

console.log(red + 'Red is my favorite color');
// warning: In some terminals the color will persist until you use the reset code, "\u001b[0m"

const underlineBlue = color('blue', 'und');

console.log(underlineBlue + 'I like to underline the color blue');

dyeStr

Builds on top of the color funciton by introducing a first parameter for text (the text you would actually want to be a different color) and then ends the entire string with an ANSI reset color escape code.

import { dyeStr } from 'cli-dye';

const error = ['brred', 'und'];

console.log(dyeStr('There was an error in this program', ...error));

const success = 'brightgreen';

console.log(dyeStr('You were successful', success));

dyeLog

Has the same parameters as color string, but calls console.log.

import { dyeLog } from 'cli-dye';

const warning = 'bryellow';

dyeLog('Warning: Show the user a cool warning', warning);

Dye

Creates a class with methods that are the names of colors from the color list. Each method calls a dyeLog function.

import { Dye } from 'cli-dye';

const dye = new Dye();

dye.green('Green machine');

Code Examples

import { dyeLog } from 'cli-dye';

dyeLog(`Text to display in bright cyan`, 'brcyan');

dyeLog(`Text to display in red with an underline`, 'red', 'underline');

dyeLog(
  `Text to display in bright green with an underline, reversed`,
  'brgreen',
  'underline,reversed',
);

const readline = require('readline');
const { dyeLog, color, dyeStr } = require('cli-dye');

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});

const theme = {
  error: 'bold-red',
  warn: 'bold-yellow',
  prompt: 'bold-cyan',
  success: 'bold-green',
  input: 'bold-white',
};

rl.question(
  dyeStr('What do you think of Node.js? ', theme.prompt) + color(theme.input),
  (answer) => {
    dyeLog(
      `Thank you for your valuable feedback: ${dyeStr(answer, theme.input)}`,
      theme.success,
    );

    rl.close();
  },
);