Unable to instrument expo app with istanbul or cypress/instrument

Question

I have been trying this for a while now, without success.

I have an expo app and I am using cypress to test some use cases using the web version of the app (generated by expo).

However, I would like to generate some code coverage as well. I have read the official documentation for it, that recommends to babel-plugin-istanbul do to so, but it does not seem to work with expo.

I am not sure why this would not work.

Edit

I removed the files previously pointed here as they were not important.

Answer 1

Thanks for a wonderful documentation provided by a hero without a cape, I figured that my settings were wrong.

All I needed to do was:

1. install babel-plugin-istanbul
2. Update babel.config.js

module.exports = {
  presets: ['babel-preset-expo'],
  plugins: [
    'istanbul',
    [
      'module-resolver',
      {
        root: ['.'],
        extensions: [
          '.js',
        ],
        alias: {
          '@': './',
        },
      },
    ],
  ],
};

3. update cypress/support/index.js

import '@cypress/code-coverage/support';

4. update cypress/plugins/index.js

module.exports = (on, config) => {
  require('@cypress/code-coverage/task')(on, config);

  // add other tasks to be registered here

  // IMPORTANT to return the config object
  // with the any changed environment variables
  return config;
};

and voilà!