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Showing content from https://github.com/pwmckenna/react-transform-style below:

pwmckenna/react-transform-style: React Transform adding support for 'className' and 'style' props on all components

This is a react-transform that makes React components support className and style props, even if they don't explicity apply them to the outermost element in their render function.

Without this, you'd need to make each React component explicity consume className and style and apply them to the outermost component. With this transform it is unnecessary (though this transform will play nicely with components that already do something like this).

import React, { Component } from 'react';

class HelloWorld extends Component {
  render() {
    return <div className="hello-world">Hello World</div>;
  }
}

<HelloWorld className="custom-class" style={{ color: 'red' }}/>

generates the following

<div style="color:red;" class="custom-class hello-world">Hello World</div>

import React, { Component } from 'react';

class HelloWorld extends Component {
  render() {
    return (
      <div
        className={classNames(this.props.className, 'hello-world')}
        style={this.props.style}
      >
        Hello World
      </div>
    );
  }
}

<HelloWorld className="custom-class" style={{ color: 'red' }}/>

still generates the following (same as above)

<div style="color:red;" class="custom-class hello-world">Hello World</div>

.babelrc

{
  "presets": [
    "react"
  ],
  "plugins": [
    ["react-transform", {
      "transforms": [{
        "transform": "react-transform-style"
      }]
    }]
  ]
}

• This will style the outermost element returned by your component's render function. Styling something deeper in the tree is not supported (and probably much harder) using this transform.
• style props are combined, with the passed in style prop taking precendence. This makes it easier to override the default styling, but there's no way to guarentee your components style won't be overridden.

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