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The function returned by this module helps you define Stilr styles within a component definition.

var stilrcx = require('stilr-classnames');
<button className={stilrcx({color: 'red'})}>Hello</button>
// -> <button className="_a39va">Hello</button>

What the function does under the hood

Every argument passed into the function is processed in a certain way and gets passed into Jed Watson's classnames functions.

If an argument is not a plain object, no processing occurs.

If an argument is a plain object, each of its key/value pairs gets checked as follows. If the value is a finite number or a string or a plain object, the pair is moved out of the object and into a new one - call it objA. (The plain object case takes care of pseudoclasses and media queries.) Otherwise, the pair is moved out and into objB.

When every argument has been processed, all the objAs are merged into one big object - call it OBJ_A.

Finally, the following is returned:

require('classnames')(objB_1, objB_2, objB_3, ...,
require('stilr').create({x: OBJ_A}).x)

More examples

For starters, you should understand that the following two are equivalent.

stilrcx({float: 'left'}, 'yo1', {yo2: false})
var cx = require('classnames');
cx('_v092z', 'yo1', {yo2: false})

Second, third, and so on, parameters can define classNames that will be included in the final className.

<button className={stilrcx({color: 'red'}, 'yo1', 'yo2')}>Hello</button>
// -> <button className="_a39va yo1 yo2">Hello</button>

This is particularly helpful when you embed components within other components.

class ButtonWithRedText extends React.Component {
  render() {
    return (
      <button className={stilrcx({color: 'red'}, this.props.className)}>
class ButtonWithRedTextAndBlueBackground extends React.Component {
  render() {
    return (
      <Foo className={stilrcx({backgroundColor: 'blue'})} />

Thanks to classnames's handling of falsy values, you can comfortably disregard falsy values being passed into the function.

<div className={stilrcx({float: 'left'}, false, undefined)} />
// -> <div className="_xo3r3" />

Also note that you can also use stilr-classnames for extending your styles prototypally.

var commonStyle = {width: 200};
var divWithRedText = <div className={stilrcx({color: 'red'}, commonStyle})} />
// -> <div className="_2nvzs" />
var divWithBlueText = <div className={stilrcx({color: 'blue'}, commonStyle})} />
// -> <div className="_y39vz" />