The module factory of `jest.mock()` is not allowed to reference any out-of-scope variables

I’m using the snippet from #1960 to mock Picker in RN

import React, {Component} from 'react';

jest.mock(`Picker`, () => {
 // ...etc
});

Works fine in Jest 17, throws following error in Jest 18:

/Users/simonsmith/Sites/new-look/newlookapp/test/unit/setup.js: babel-plugin-jest-hoist: The module factory of `jest.mock()` is not allowed to reference any out-of-scope variables.
    Invalid variable access: React
    Whitelisted objects: Array, ArrayBuffer, ..... etc

I’m using React 15.4.2 and RN 0.40

I tried babel-jest@test and they run as expected but all my snapshots fail, looks like more props are coming through which is probably unrelated to this.

Anything I can do to fix this now or should I wait for the next release for babel-jest?

Thanks 😃

Issue Analytics

State:
Created 7 years ago
Reactions:4
Comments:37 (5 by maintainers)

Top GitHub Comments

208reactions

faucctcommented, Jan 31, 2018

Using jest.doMock instead of jest.mock has helped me.

151reactions

cpojercommented, Mar 19, 2019

you need to do this:

jest.mock(`Picker`, () => {
  const React = require('react');
});

This used to be a bug that we fixed. In a mock you can only require things locally and you aren’t allowed to access external variables.

Top Results From Across the Web

Service mocked with Jest causes "The module factory of jest ...

mock() is not allowed to reference any out-of-scope variables. I'm using babel with ES6 syntax, jest and enzyme. I have a simple component ......

Two ways to fix the Jest test error “the module factory of `jest ...

The module factory of “jest.mock()” is not allowed to reference any out-of-scope variables. Fix 1. Prepend your jest.fn() variable ...

Two ways to fix the Jest test error "the module factory of `jest ...

Jest will complain that the module factory of "jest.mock()" is not allowed to reference any out-of-scope variables . Fix 1. Prepend your jest.fn ......

Jest.mock is not allowed to reference variables - JS-HowTo

Service mocked with Jest causes "The module factory of jest.mock() is not allowed to reference any out-of-scope variables"

ES6 Class Mocks - Jest

Jest can be used to mock ES6 classes that are imported into files you want to test. ES6 classes are constructor functions with...