use different babel preset when running mocha tests

babeljs, mocha.js, npm

Solution

You could create a file named `babel-hook.js` and put in it:

require("babel-register")({
  presets: [ /* whatever values you want here */ ],
});

then run Mocha like this:

mocha --require babel-hook

This will register Babel and you can use any configuration option you want with it, separate from anything in `package.json`.

Problem

My npm package build runs with babel and I configured a babel preset in my `package.json` with `"babel": { "presets": ["es2015"] }` I also configured a mocha test script with `"test": "mocha --compilers js:babel-core/register"` However, I would like to run my tests using a different babel preset than that one specified for my build. Is it possible? I would you achieve that?

Original source