What are the steps to integrate HJSON with Jest in a create-react-app development environment?

Currently, I am utilizing HJSON within a create-react-app project (view answer here). However, Jest does not utilize the same webpack configuration, resulting in a failed import of HJSON - for instance,

import options from '../assets/options.hjson'; 

simply assigns options as the string '../assets/options.hjson'.

Therefore, the question remains: how can one successfully import an HJSON file using Jest?

Answer №1

If you want Jest to handle HJSON and convert it to JSON, you'll need to create a transformer module. You can find more information in the documentation here.

To do this, create a file called jest-hjson-transformer.js in your main directory with the following code:

const hjson = require('hjson');

function process(src, path, config, transformOptions) {
  const json = hjson.parse(src);
  const jsonStr = JSON.stringify(json, null, 2);
  const out = `module.exports = ${jsonStr}`;
  return out;
}
exports.process = process;

Next, make sure to update your package.json with the following configuration:

  "jest": {
    "moduleFileExtensions": [
      "js",
      "jsx",
      "hjson"
    ],
    "transform": {
      "^.+\\.hjson$": "<rootDir>/jest-hjson-transformer.js"
    }
  },

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