@americanexpress/css-to-js v1.0.1

Tool for transforming CSS into JS

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//Input CSS string, Outputs JS Object
convert(.myClass { color: 'red' });

//Input CSS string, Output file exporting JS Object
convert(.myClass { color: 'red' }, { outputType: 'file', outputPath: 'outPath' });

//Input CSS file path, Output file exporting JS Object
convert('absolute-path-to-css-file', { outputType: 'file', outputPath: 'outPath' });

//Input CSS file path, Output file exporting multiple JS Objects
convert('absolute-path-to-css-file', { outputType: 'shakeFile', outputPath: 'outPath' });

//Input CSS file path, Outputs dir of files exporting single JS Objects (If treeshaking not supported)
convert('absolute-path-to-css-file', { outputType: 'splitFile', outputPath: 'outPath' });

//Input Dir path of CSS files, Output array of JS Objects
convert('absolute-path-to-dir');

//Input Dir path of CSS files, Output dir of converted files exporting JS Object
convert('absolute-path-to-dir'', { outputType: 'file', outputPath: 'outPath' });

## 🎛️ API  
  
#### Input and Output type options

##### *Ensure paths are absolute or relative to the root only*

  
| Convert Function                                                              | Input Type                                     | Output Type(s)                                                                                                                                  |
|-------------------------------------------------------------------------------|------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------|
| convert(css);                                                                 | Path to single CSS file or string of CSS code  | JS style object                                                                                                                         |
| convert(css, { outputType: 'file', outputPath: 'example.js' });               | Path to single CSS file or string of CSS code  | Generated JS file 'example.js' with a default export of a JS style object                                                               |
| convert(css, { outputType: 'shakeFile', outputPath: 'shakeExample.js' });     | Path to single CSS file or string of CSS code  | Generated JS file 'shakeExample.js' with multiple named exports of JS style objects                                                     |
| convert(css, { outputType: 'splitFile', outputPath: 'splitExample' });        | Path to single CSS file or string of CSS code  | Generated directory 'splitExample' with multiple files each with a default export of a JS style object                                  |
| convert(dirPath);                                                             | Path to directory of CSS files                 | Array of JS style objects                                                                                                               |
| convert(dirPath, { outputType: 'file', outputPath: 'exampleDir' });           | Path to directory of CSS files                 | Generated directory of JS files; Each file has a default export of a JS style object and is named after the corresponding css file      |
| convert(dirPath, { outputType: 'shakeFile', outputPath: 'shakeExample.js' }); | Path to directory of CSS files                 | Generated directory of JS files; Each file has multiple named exports of JS style objects and is named after the corresponding css file |
| convert(dirPath, { outputType: 'splitFile', outputPath: 'splitExample' });    | Path to directory of CSS files                 | Generated directory of directories; Each file has a default export of a JS style object and is named after the corresponding css file   |
 
 
#### File conversion examples
 
  
**Sample Input: `nav.css`**  
```css  
.class1 {    
  color: 'red';  
}  
.class2 {
  color: 'blue'; 
}

Example 1: File - Creates a file with a single object export representing tree of full converted css

convert(
   path.resolve(__dirname, './nav.css'), 
   { 
     outputType: 'file', 
     outputPath: path.resolve(__dirname, '../example1.js') 
   }
);

Output: Example1.js

export default {   
  class1: { color: 'red' },   
  class2: { color: 'blue' } 
}  

Example 2: ShakeFile - Create file with multiple exports representing each selector of converted css
(Useful for tree-shaking style objects that do not get used)

convert(
   path.resolve(__dirname, './nav.css'), 
   { 
     outputType: 'shakeFile', 
     outputPath: path.resolve(__dirname, '../example2.js') 
   }
);

Output: Example2.js

export const class1 = { color: 'red' };  
export const class2 = { color: 'blue' };  

Example 3: SplitFile - Create multiple files with exports representing each selector of converted css
(Useful for excluding style objects that do not get used if tree-shaking is not implemented)

convert(
   path.resolve(__dirname, './nav.css'), 
   { 
     outputType: 'splitFile', 
     outputPath: path.resolve(__dirname, '../example3') 
   }
);

Output: Example3/

class1.js

export default { color: 'red' };  

class2.js

export default { color: 'blue' }; 

Media Reverse

Note: mediaReverse is always true if output type is shakeFile or splitFile

Sometimes it's useful to have the styles located in media queries distributed into the selector properties rather than be their own property.
If the mediaReverse flag is set to true, reverse the positioning of media queries to be inside the property.

nav.css

.class1 { color: 'red'; }  
  
@media (min-width:500px) {    
  .class1 { color: 'blue'; } 
}  
@media (min-width:1000px) {    
  .class1 { color: 'green'; } 
}  

If mediaReverse is not set:

convert(
   path.resolve(__dirname, './nav.css'), 
   { 
     outputType: 'file', 
     outputPath: path.resolve(__dirname, '../example4.js') 
   }
);

Example4.js

export default {   
  class1: { color: 'red' },   
  '@media (min-width:500px)': {  
    class2: { color: 'blue' }   
  },  
  '@media (min-width:1000px)': {
    class2: { color: 'green' }   
  }  
}  

If mediaReverse is set to true:

convert(
   path.resolve(__dirname, './nav.css'), 
   { 
     outputType: 'file', 
     outputPath: path.resolve(__dirname, '../example4.js'),
     mediaReverse: true 
   }
);

Example4.js

export default {   
 class1: { color: 'red' },   
 class2: {   
   '@media (min-width:500px)': {  
     color: 'blue'   
   },  
   '@media (min-width:1000px)': {
     color: 'green'   
   }    
 }  
}  

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