Haxe classNames

Haxe utility for conditionally joining classNames together. Inspired by npm package classnames by JedWatson.

Getting Started

Installing

haxelib install classnames

Usage with React

Example usage with a react component:

class Bar extends ReactComponentOfProps<BarProps> {
	override public function render() {
		var classNames = ClassNames.fast(
			"base",
			props.className,
			{
				disabled: props.disabled,
				checked: !props.disabled && props.checked
			}
		);

		return jsx('<div className=$classNames />');
	}
}

Variant with fastAsObject() for destructuring props:

class Bar extends ReactComponentOfProps<BarProps> {
	override public function render() {
		var classes = ClassNames.fastAsObject(
			"base",
			props.className,
			{
				disabled: props.disabled,
				checked: !props.disabled && props.checked
			}
		);

		return jsx('<div {...classes} />');
	}
}

Usage:

// className="base myclass checked"
jsx('<$Bar className="myclass" checked=$true />');

// className="base myclass1 myclass2 disabled"
jsx('<$Bar className="myclass1 myclass2" disabled=$true />');

// className="base disabled"
jsx('<$Bar className="checked" disabled=$true />');

Simple use cases will be optimized at compile time:

var classNames = ClassNames.fast(
	"base",
	{
		disabled: props.disabled,
		checked: !props.disabled && props.checked
	}
);

// Will be transpiled to:
var classNames = "base" + (props.disabled?" disabled":"") + (!props.disabled && props.checked?" checked":"");

Or even be inlined:

var classNames = ClassNames.fast("btn", "btn--large");
var classNames = ClassNames.fast(["btn", "btn--large"]);
var classNames = ClassNames.fast({"btn": true, "btn--large": true});

// Will all be transpiled to:
var classNames = "btn btn--large";

Running the tests

To run all tests except React-related tests:

npm run test

To run all tests, including React-related tests:

npm run test:including-react

Future releases

There are still some features under way:

• Helpers for working with css modules (see bind() in classnames npm package)
• Helpers for working with BEM
• Better compile-time error messages

License

This project is licensed under the MIT License - see the LICENSE file for details