Adding your own preprocessor config

[wordyallen]

Maybe add an example of adding your own preprocessor config to the docs ?

preproccesor.js:

module.exports = require('babel-jest').createTransformer({
  "plugins": ["transform-es2015-modules-commonjs"]
});

package.json:

  "jest": {
    "transform": {
      "^.+\\.js$": "<rootDir>/preprocessor.js",
      "^.+\\.feature$": "gherkin-jest"
    },

[sjmeverett]

What does this do?

[fullstackwebdev]

updated syntax

    transform: {
      "^.+\\.js$": "babel-jest",
      "^.+\\.feature$": "gherkin-jest"
    },

• Allows non.feature file tests written in babel to run parallel to feature

[noahrc]

I agree that this would be helpful. It took me a while to figure out why babel stopped working for my other tests after adding the transform for gherkin-jest.