@morev/console-css

The library to style browser console messages.

Why?

¯\_(ツ)_/¯

Sometimes you may want to warn users of your site like Facebook does:

Perhaps you want to make a prominent message to the developers like BBC does:

Maybe you want to enchance some of your custom dev utilities, etc.

BUT

If you want to print BBC News logotype in the console, you need to write smth like that:

console.log('%cB%c %cB%c %cB%c %cNEWS       %c', 'font-style:bold;font-size:40px;padding:4px 16px;background:#000;color:#fff;', 'background:none', 'font-style:bold;font-size:40px;padding:4px 16px;background:#000;color:#fff;', 'background:none', 'font-style:bold;font-size:40px;padding:4px 16px;background:#000;color:#fff;', 'background:none', 'font-style:bold;font-size:40px;padding:4px 16px;background:#b80000;color:#fff;', 'background:none');

Copy-paste into you browser console and press Enter to see the result.
The code doesn't look friendly, huh?

But there is another way:

import ConsoleCSS from '@morev/console-css';

ConsoleCSS.add(`
  .letter {
    font-style: bold;
    font-size: 40px;
    padding: 4px 16px;
    background: #000000;
    color: #ffffff;
  }
  .bg-red {
    background: #ff0000;
  }
`);

ConsoleCSS.styled.log(`
  <span class="letter">B</span>
  <span class="letter">B</span>
  <span class="letter">C</span>
  <span class="letter bg-red">News</span>
`)

---

Installation

Using yarn

yarn add @morev/console-css

Using npm

npm install @morev/console-css

Using pnpm

pnpm add @morev/console-css

Usage

The package exports the ConsoleCSS class instance that considered singleton.
If used directly in HTML without any bundler - it's available via window.ConsoleCSS.

Important: The package only works in browser. It doesn't fall but does nothing on server side.

Default styles

By default, the package styles only well-known HTML tags:

• <b> - bold text
• <i> - italic text
• <u> - underlined text
• <s> - strikethrough text

Inline style

You may use inline styles:

import ConsoleCSS from '@morev/console-css';

ConsoleCSS.styled.log(`<b style="color: red;">Red bold text</b>`);

Adding custom CSS tokens

The core class has a method .add(rules: string) that accepts a CSS-like string with needed tokens.
You can use .add() method multiple times.

This input string isn't validated, so make sure your CSS syntax is correct.

import ConsoleCSS from '@morev/console-css';

ConsoleCSS.add(`
  .block { color: red; text-decoration: underline; }
`);

ConsoleCSS.styled.log('<span class="block">Red underlined text</span>');

Override the default window.console object

That might be annoying to remember about custom styled messages class, so the library provides a way to replace global window.console

import ConsoleCSS from '@morev/console-css';

// No matters before or after `.override()` call
ConsoleCSS.add(`
  .block { color: red; text-decoration: underline; }
`);

ConsoleCSS.override();

console.log('Wow, <span class="block">a styled message</span> using native `console.log`!');

// Restore the original `window.console`
ConsoleCSS.restore();

console.log('No longer <span class="block">styled</span> messages :(');