cssx-transpiler

CSSX-Transpiler

Transpile <style> tags to valid JavaScript.

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Installation

npm install cssx-transpiler -D

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Simple usage

var cssxTranspiler = require('cssx-transpiler');

var code = require('fs').readFileSync('./file.js', { encoding: 'utf8' }).toString();
/* let's say that the file contains =

  var styles = function (margin) {
    return <style>
      body {
        margin: `margin`px;
        padding: 0;
      }
    </style>
  };

*/

var transpiled = cssxTranspiler(code, { minified: false });
console.log(transpiled);
/*

  var styles = function (margin) {
    return (function () {
      var _2 = {},
          _3 = {};
      _3['margin'] = margin + "px";
      _3['padding'] = '0';
      _2['body'] = _3;
      return _2;
    }.apply(this));
  };

*/

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API

cssxTranspiler(<code>, <options>)

• code - string
• options - key-value pairs. The available options are: minified, compact, concise, quotes. All the options are booleans.

Returns a transpiled version of the code;

cssxTranspiler.ast(<code>)

• code - string

Returns abstract syntax tree.

cssxTranspiler.reset()

While transpiling the module is creating bunch of unique ids in the format of _<number>. This method resets the number to 0.

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Transformations

CSSX transpiler is basically CSS to JSON process:

.container {
  margin: 10px;
  padding: 20px;
}

is transformed to

{
  ".container": {
    "margin": "10px",
    "padding": "20px"
  }
}

Nested styles like media queries:

@media (max-width: 450px) {
  .container {
    width: 100%;
  }
}

results to:

{
  "@media (max-width: 450px)": {
    ".container": {
      "width": "100%"
    }
  }
}

The libraries deals with same name properties in the following way:

body {
  background: red;
  background: url(../img/image.png);
}

results to:

{
  "body": {
    "background": [
      "red",
      "url(../img/image.png)"
    ]
  }
}

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Where to go from here

• CSSX language
• CSSX client-side library