Jest SyntaxError: Unexpected token export

[toddsampson]

I know an issue isn't the best place for this, but I thought it should be documented somewhere.

Vue-timers was working as a global import or mixin in my app. However, it completely broke all my Jest tests. The errors thrown varied from TypeError: Cannot read property 'setData' of undefined to SyntaxError: Unexpected token export depending on what I tried to fix it.

I finally realized that I needed to update my jest.config.js from:

  transformIgnorePatterns: [
    'node_modules/',
  ],

to

  transformIgnorePatterns: [
    'node_modules/?!(vue-timers)',
  ],

This is probably obvious for someone with more Jest experience, but I figured I should document what I found since it took me way too long to track down.

[pattrickrice]

Unfortunately this did not solve the problem on my project.

[naomiaro]

@pattrickrice I had to also add, was missing this before.

transform: {
  '^.+\\.js$': 'babel-jest'
}