Jest: Typing error on jest-haste-map HastMap class

[naimkhalifa]

🐛 Bug Report

Hello,

I just updated my project dependencies today on a VueJS project. It resulted in following jest dependencies update in my package.json: "ts-jest": "^25.0.0" (previously ^24.1.0) and @types/jest": "^24.9.1"(previously ^24.0.21).

Now, when I run yarn serve and yarn build I get the following typing error:

ERROR in .../node_modules/jest-haste-map/build/index.d.ts(125,32):

125:32 Type 'typeof EventEmitter' is not a constructor function type.
    123 |  *
    124 |  */
  > 125 | declare class HasteMap extends EventEmitter {
        |                                ^
    126 |     private _buildPromise;
    127 |     private _cachePath;
    128 |     private _changeInterval?;
Version: typescript 3.7.5
Time: 13756ms

  App running at:
  - Local:   http://localhost:3000/ 
  - Network: http://192.168.11.62:3000/

  Note that the development build is not optimized.
  To create a production build, run yarn build.

To Reproduce

Update "ts-jest" and "@types/jest" to the latest version.

Expected behavior

Application builds normally as it did with previous versions of those packages.

[SimenB]

It is a class: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/2a7deeea29c4806f6e77a6bbfff9a2801152aecf/types/node/events.d.ts#L41

Which version of @types/node do you have installed?

[dmpe]

Facing same issue here. My @types/node is 13.5 - i.e. latest available.

├─ @types/[email protected]
└─ [email protected]

[SimenB]

Did you update jest at all? Neither ts-jest or @types/jest are maintained in this repo, so if you only updated those deps you should open up an issue with them.

Regardless, this needs a reproduction

[dmpe]

Yes, I did. After downgrading jest packages, including types/node from 13.5 to 13.1.8, it seems that something with @types/node made jest error.

According to https://www.npmjs.com/package/@types/node, time difference is just ~ 1 Week.

History of nodejs commits:
https://github.com/DefinitelyTyped/DefinitelyTyped/commits/master/types/node

Maybe relevant commits:
https://github.com/DefinitelyTyped/DefinitelyTyped/commit/19826ba267c2203e61d28b87f56ca28eac23a994#diff-320a69421ec88a833298a68535bea54a
https://github.com/DefinitelyTyped/DefinitelyTyped/pull/41353

[SimenB]

I don't get this error.

$ yarn init -y
$ yarn add @types/node typescript jest-haste-map
$ yarn tsc --init
$ vim index.ts
$ yarn tsc -b .

contents of index.ts:

import { EventEmitter } from 'events';
import HasteMap = require('jest-haste-map');

export default class OurEventEmitter extends EventEmitter {}

export { HasteMap };

I get no errors. Can you provide a reproduction?

[snelg]

@naimkhalifa and @dmpe It's a package conflict with @vue/cli-plugin-unit-jest
That package still uses jest 24.9.0, which breaks with @types/node 13.5.0

What worked for me (for now, at least) :
After yarn upgrade --latest, I did yarn add @types/[email protected] , forcing that downgraded version of @types/node to also be available

[SimenB]

Right, so this is an issue with jest 24. We won't be releasing a patch for 24, so if you're impacted please upgrade to Jest 25

[Chris2011]

Thx @snelg, that worked for me too :)

[bradleat]

Shouldn't the jest-haste-map line read declare class HasteMap extends EventEmitter.EventEmitter?

or the import be import {EventEmitter} from 'events';