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readme.md

clsx

A tiny (229B) 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';

// 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.

obj-str - Similar utility that is faster and smaller (96B) but only works with Objects.