Jest: Jest 25.1.0 Environment setup: SyntaxError: Cannot use import statement outside a module

[Shooshte]

🐛 Bug Report

Jest ^25.1.0 does not transform specified config files using babel-jest. According to this issue the functionality should be supported. Instead I am getting the following error message:

● Test suite failed to run

/Users/shooshte/Work/PersonalProjects/untitled-combat-game/API/src/__tests__/config/environment.js:1
import { MongoClient } from "mongodb";
^^^^^^

SyntaxError: Cannot use import statement outside a module

To Reproduce

Steps to reproduce the behavior:

jest.config.js:

module.exports = {
  transform: {
    "^.+\\.(t|j)s$": "babel-jest"
  },
  globalSetup: "./src/__tests__/config/setup.js",
  globalTeardown: "./src/__tests__/config/teardown.js",
  testEnvironment: "./src/__tests__/config/environment.js",
  testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
  moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"]
};

./src/__tests__/config/setup.js

import { MongoClient } from "mongodb";
import NodeEnvironment from "jest-environment-node";

class MongoEnvironment extends NodeEnvironment {
  async setup() {
    const serverOptions = {
      dbUrl: process.env.dbUrl,
      dbName: process.env.dbName,
      environment: process.env.environment,
      port: process.env.port
    };

    if (!this.global.connection) {
      this.connection.database = await MongoClient.connect(dbUrl, {
        poolSize: 50,
        useNewUrlParser: true,
        useUnifiedTopology: true,
        wtimeout: 2500
      });
      this.global.database = connection.database(serverOptions.dbName);
    }
  }

  async teardown() {
    await this.global.connection.close();
    await super.teardown();
  }

  runScript(script) {
    return super.runScript(script);
  }
}

export default MongoEnvironment;

Run npx jest --config jest.config.js --verbose --watch

Expected behavior

I would expect that the code would get run without errors.

envinfo

  System:
    OS: macOS 10.15.3
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  Binaries:
    Node: 13.7.0 - /usr/local/bin/node
    Yarn: 1.21.1 - /usr/local/bin/yarn
    npm: 6.13.7 - /usr/local/bin/npm
  npmPackages:
    jest: ^25.1.0 => 25.1.0 

[Mowgly777]

experiencing the same issue

[Mowgly777]

Hey, just to let you know, this solution got me up and running https://github.com/facebook/jest/issues/9395#issuecomment-583799300

[ThomasCarca]

Any news on this ? Still having the following similar issue :

import { default as AmplifyCore, I18n } from 'aws-amplify';
^^^^^^

SyntaxError: Cannot use import statement outside a module
import { withOAuth } from 'aws-amplify-react-native'
^

versions :

"aws-amplify": "^3.0.8",
"aws-amplify-react-native": "^4.0.4",

[SimenB]

Transforming custom environment will be fixed by #8751, which will come in Jest 26.

[jarod-legault]

Now it is expected in Jest 27 according to @SimenB here. That's too bad. I've spent hours trying to get my custom environment working with imports.