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jest-scss-transform

v1.0.4

Published

jest transform to support variables exported from scss and imported into js

Downloads

82,608

Readme

jest-scss-transform

Branches coverage Functions coverage Lines coverage Statements coverage

Jest transformer for .scss files.

Useful for when you're sharing variables between Sass and JavaScript, and makes your snapshots much nicer.

Install

npm i -D jest-scss-transform

or

yarn add -D jest-scss-transform

Add to your Jest config

Using jest.config.js:

module.exports = {
  // A map from regular expressions to paths to transformers
  transform: {
    "^.+\\.scss$": 'jest-scss-transform',
  },
};

Similarly, using "jest" key in package.json (create-react-app, etc):

{
  "jest": {
    "transform": {
      "^.+\\.scss$": "<rootDir>/node_modules/jest-scss-transform"
     }
  }
}

Example

Assume you have an scss file, e.g. colors.scss--

$brandPrimary: #000000;
$brandSecondary: #ffffff;

:export {
  brandPrimary: $brandPrimary;
  brandSecondary: $brandSecondary;
}

And you're importing those variables for use in your js app, e.g. colors.js--

import colors from 'colors.scss';

export const brandPrimary = colors.brandPrimary;
export const brandSecondary = colors.brandSecondary;

Webpack will compile these nicely, but Jest will not. Most configurations will result in undefined or empty string values for each of those constants.

Using this package, they'll be read-in as the string literal value of the scss variables. For example--

import * as colors from 'colors.js';

console.log(colors.brandPrimary); // $brandPrimary
console.log(colors.brandSecondary); // $brandSecondary

This makes for really nice snapshot tests, where instead of being written as hex codes (#04ae46), undefined, etc, style properties are written as their semantic scss variable names ($brandPrimary).

See the example directory for a demo of some basic snapshot output.