clsx

A tiny (234B) utility for constructing className strings conditionally.
Also serves as a faster & smaller drop-in replacement for the classnames module.

This module is available in three formats:

• ES Module: dist/clsx.m.js
• CommonJS: dist/clsx.js
• UMD: dist/clsx.min.js

Install

$ npm install --save clsx

Usage

import clsx from 'clsx';
// or
import { clsx } from 'clsx';

// Strings (variadic)
clsx('foo', true && 'bar', 'baz');
//=> 'foo bar baz'

// Objects
clsx({ foo:true, bar:false, baz:isTrue() });
//=> 'foo baz'

// Objects (variadic)
clsx({ foo:true }, { bar:false }, null, { '--foobar':'hello' });
//=> 'foo --foobar'

// Arrays
clsx(['foo', 0, false, 'bar']);
//=> 'foo bar'

// Arrays (variadic)
clsx(['foo'], ['', 0, false, 'bar'], [['baz', [['hello'], 'there']]]);
//=> 'foo bar baz hello there'

// Kitchen sink (with nesting)
clsx('foo', [1 && 'bar', { baz:false, bat:null }, ['hello', ['world']]], 'cya');
//=> 'foo bar hello world cya'

API

clsx(...input)

Returns: String

input

Type: Mixed

The clsx function can take any number of arguments, each of which can be an Object, Array, Boolean, or String.

Important: Any falsey values are discarded!
Standalone Boolean values are discarded as well.

clsx(true, false, '', null, undefined, 0, NaN);
//=> ''

Benchmarks

For snapshots of cross-browser results, check out the bench directory~!

Support

All versions of Node.js are supported.

All browsers that support Array.isArray are supported (IE9+).

Note: For IE8 support and older, please install clsx@1.0.x and beware of #17.

Tailwind Support

Here some additional (optional) steps to enable classes autocompletion using clsx with Tailwind CSS.

Visual Studio Code

1. Install the "Tailwind CSS IntelliSense" Visual Studio Code extension

2. Add the following to your settings.json:

 {
  "tailwindCSS.experimental.classRegex": [
    ["clsx\\(([^)]*)\\)", "(?:'|\"|`)([^']*)(?:'|\"|`)"]
  ]
 }

Related

• obj-str - A smaller (96B) and similiar utility that only works with Objects.

License

MIT © Luke Edwards