new EventEmitter() instanceof Object returns false when run by Jest

Do you want to request a feature or report a bug? bug

What is the current behavior?

On node an instance of EventEmitter are instances of Object

const { EventEmitter } = require('events');
const eventEmitter = new EventEmitter();
eventEmitter instanceof Object; //true

Running the same code inside a Jest run will report that this is false.

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

https://repl.it/@Aigeec/Jest-thinks-EventEmitter-is-not-an-object https://repl.it/@Aigeec/Node-thinks-EventEmitter-is-an-object

What is the expected behavior? In a Node env it should evaluate the same as Node.

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system. Jest Config:

{
  "testRegex": ".*-test\\.js$",
  "testEnvironment": "node"
}

Using the repl versions: node v7.4 linux/amd64 Jest v20.0.4 node v7.4.0 linux/amd64

[jwbay]

Looks like a duplicate of #2549

[Aigeec]

In the repl.it you do typeof EventEmiter === ‘object’ but it’s a function in both environments

I think it was a little ‘e’ typeof eventEmitter === 'object' referring to the eventEmitter instance.

In either case EventEmitter instanceof Object or new EventEmitter() instanceof Object will return false in a Jest environment but true in Node.