| # clsx [](https://github.com/lukeed/clsx/actions?query=workflow%3ACI) [](https://codecov.io/gh/lukeed/clsx) [](https://licenses.dev/npm/clsx) | |
| > A tiny (239B) utility for constructing `className` strings conditionally.<Br>Also serves as a [faster](bench) & smaller drop-in replacement for the `classnames` module. | |
| 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 | |
| ```js | |
| 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!<br>Standalone Boolean values are discarded as well. | |
| ```js | |
| 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<br> | |
| > **Availability:** CommonJS, ES Module, UMD | |
| The default `clsx` module; see [API](#API) for info. | |
| ```js | |
| import { clsx } from 'clsx'; | |
| // or | |
| import clsx from 'clsx'; | |
| ``` | |
| #### `clsx/lite` | |
| > **Size (gzip):** 140 bytes<br> | |
| > **Availability:** CommonJS, ES Module<br> | |
| > **CAUTION:** Accepts **ONLY** string arguments! | |
| Ideal for applications that ***only*** use the string-builder pattern. | |
| Any non-string arguments are ignored! | |
| ```js | |
| 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`](bench) directory~! | |
| ## Support | |
| All versions of Node.js are supported. | |
| All browsers that support [`Array.isArray`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray#Browser_compatibility) are supported (IE9+). | |
| >**Note:** For IE8 support and older, please install `clsx@1.0.x` and beware of [#17](https://github.com/lukeed/clsx/issues/17). | |
| ## Tailwind Support | |
| Here some additional (optional) steps to enable classes autocompletion using `clsx` with Tailwind CSS. | |
| <details> | |
| <summary> | |
| Visual Studio Code | |
| </summary> | |
| 1. [Install the "Tailwind CSS IntelliSense" Visual Studio Code extension](https://marketplace.visualstudio.com/items?itemName=bradlc.vscode-tailwindcss) | |
| 2. Add the following to your [`settings.json`](https://code.visualstudio.com/docs/getstarted/settings): | |
| ```json | |
| { | |
| "tailwindCSS.experimental.classRegex": [ | |
| ["clsx\\(([^)]*)\\)", "(?:'|\"|`)([^']*)(?:'|\"|`)"] | |
| ] | |
| } | |
| ``` | |
| </details> | |
| You may find the [`clsx/lite`](#clsxlite) module useful within Tailwind contexts. This is especially true if/when your application **only** composes classes in this pattern: | |
| ```js | |
| clsx('text-base', props.active && 'text-primary', props.className); | |
| ``` | |
| ## Related | |
| - [obj-str](https://github.com/lukeed/obj-str) - A smaller (96B) and similiar utility that only works with Objects. | |
| ## License | |
| MIT © [Luke Edwards](https://lukeed.com) | |