clsx 
A tiny (239B) utility for constructing
classNamestrings conditionally.
Also serves as a faster & smaller drop-in replacement for theclassnamesmodule.
This module is available in three formats:
- ES Module:
dist/clsx.mjs - 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);
//=> ''Modes
There are multiple "versions" of clsx available, which allows you to bring only the functionality you need!
clsx
Size (gzip): 239 bytes
Availability: CommonJS, ES Module, UMD
The default clsx module; see API for info.
import { clsx } from 'clsx';
// or
import clsx from 'clsx';clsx/lite
Size (gzip): 140 bytes
Availability: CommonJS, ES Module
CAUTION: Accepts ONLY string arguments!
Ideal for applications that only use the string-builder pattern.
Any non-string arguments are ignored!
import { clsx } from 'clsx/lite';
// or
import clsx from 'clsx/lite';
// string
clsx('hello', true && 'foo', false && 'bar');
// => "hello foo"
// NOTE: Any non-string input(s) ignored
clsx({ foo: true });
//=> ""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.xand beware of #17.
Tailwind Support
Here some additional (optional) steps to enable classes autocompletion using clsx with Tailwind CSS.
Visual Studio Code
-
Install the "Tailwind CSS IntelliSense" Visual Studio Code extension
-
Add the following to your
settings.json:
{
"tailwindCSS.experimental.classRegex": [
["clsx\\(([^)]*)\\)", "(?:'|\"|`)([^']*)(?:'|\"|`)"]
]
}You may find the clsx/lite module useful within Tailwind contexts. This is especially true if/when your application only composes classes in this pattern:
clsx('text-base', props.active && 'text-primary', props.className);Related
- obj-str - A smaller (96B) and similiar utility that only works with Objects.
License
MIT © Luke Edwards