TypeError: this._getEventHandlerFor is not a function

[savv]

Current behavior

This is a duplicate of #2436, but for a different environment. Downgrading to jest@24.9.0 makes this issue go away. Upgrading to >=25, makes this issue surface, but this seems to be because it seems I get an older version of https://github.com/jsdom/jsdom

Your environment

API

• shallow
• mount
• render

Version

library	version
enzyme	^3.11.0
react	16.13.1
react-dom	^16.13.1
react-test-renderer	16.13.1
adapter (below)	^1.15.5

Adapter

• enzyme-adapter-react-16

[ljharb]

What version of jsdom are you using? What exact error are you getting, on what code? What jest config are you using, including any setup code?

[savv]

What version of jsdom are you using?

16.4.0

The thing that causes this is upgrading jest from 24.9.0 to 26.5.2 (or 25..). My guess is that it has to do with the transitive jsdom dependencies.

What exact error are you getting, on what code?

I get the same error as in #2436. It's unclear from the stack trace where it happens, but it seems to be during setup:

  ● Test suite failed to run

    TypeError: this._getEventHandlerFor is not a function

      at Object.get (node_modules/jsdom/lib/jsdom/living/helpers/create-event-accessor.js:86:26)
          at Array.forEach (<anonymous>)

What jest config are you using, including any setup code?

The setup code is exactly the same as in #2436

My jest config is:

{
    "preset": "react-native",
    "transformIgnorePatterns": [
      "/node_modules/(?!native-base)/"
    ],
    "testMatch": [
      "**/test_*.ts",
      "**/test_*.tsx"
    ],
    "coveragePathIgnorePatterns": [
      "/node_modules/",
      "/common/"
    ],
    "setupFiles": [
      "<rootDir>/testing/setup.js",
      "./node_modules/react-native-gesture-handler/jestSetup.js"
    ]
  }

[ljharb]

If you're getting an error from inside jsdom, then that's a bug in jsdom that you should file there.

Specifically for react-native, though, there doesn't yet exist a react-native adapter for enzyme, and you're using a react web adapter. #1436 tracks a proper adapter.

[savv]

Thanks, I'm aware of all this. I would be great to use this new adapter when it's ready, but in the meantime enzyme seems to recommend this approach, here.

I just noticed that the recommended configuration changed. I will try that.