jestjs - jest global variable example

Question

Can someone give an example on how to use jest globals?

{
  ...
  "jest": {
    "globals": {
      "__DEV__": true,
    }
  }
  ...
}

Do I specify the globals in the package.json file or do I create a folder with a js file where the globals should be defined?

Thanks

Answer 1

Yep. You put the globals in the package.json. For example, here's an excerpt from the default react-native jest configuration:

"jest": {
    "globals": {
       "__DEV__": true,
       "__RCTProfileIsProfiling": false
     },
     ...
},

This will make the variables available globally when the tests are run.