JavaScript | Jest - pass env variables into jest.config.js file

In this short article, we would like to show how to pass env variables into jest.config.js file in JavaScript project.

Project configuration

Example jest.config.js file:

// ...
// ...
module.exports = () => {
    const {variable1, variable2, variable3} = process.env;
    // ...
    return {
        // ...
    };
};

Where: jest.config.js should be located directly in the project directory.

Running tests

Using a Bash environment:

1. open command line,
2. go to the project directory,
3. run the command:

   variable1=value1 variable2=value2 variable3=value3 npx jest