TypeError: Cannot read property 'hasOwnProperty' of undefined

[gastonfartek]

I am getting a TypeError: Cannot read property 'hasOwnProperty' of undefined
at

import { Adapter } from "enzyme-adapter-preact"

node_modules/enzyme-adapter-preact/node_modules/react-test-renderer/cjs/react-test-renderer-shallow.development.js:276:27 at Object.<anonymous> (node_modules/enzyme-adapter-preact/node_modules/react-test-renderer/cjs/react-test-renderer-shallow.development.js:943:5) at Object.<anonymous> (node_modules/enzyme-adapter-preact/node_modules/react-test-renderer/shallow.js:6:20) at Object.<anonymous> (node_modules/enzyme-adapter-preact/lib/PreactAdapter.js:20:16) at Object.<anonymous> (node_modules/enzyme-adapter-preact/lib/index.js:7:22)

[gastonfartek]

I noticed that node_modules/enzyme-adapter-preact/lib/PreactAdapter.js:20:16 was requiring react-test-renderer/shallow, so I added this to my jest.config and it seems to have fixed the issue:

 moduleNameMapper: {
  //...
  "^react-test-renderer/shallow$": "preact-test-utils"`
}

However, are there any downsides about that approach?

[ijones922]

Getting the same issue,

TypeError: Cannot read property 'hasOwnProperty' of undefined

      1 | const configure = require('enzyme').configure;
    > 2 | const Adapter = require('enzyme-adapter-preact');
        |               ^
      3 |
      4 | configure({ adapter: new Adapter() });
      5 |

      at node_modules/react-test-renderer/cjs/react-test-renderer-shallow.development.js:276:27
      at Object.<anonymous> (node_modules/react-test-renderer/cjs/react-test-renderer-shallow.development.js:943:5)
      at Object.<anonymous> (node_modules/react-test-renderer/shallow.js:6:20)
      at Object.<anonymous> (node_modules/enzyme-adapter-preact/lib/PreactAdapter.js:20:16)
      at Object.<anonymous> (node_modules/enzyme-adapter-preact/lib/index.js:7:22)
      at Object.<anonymous> (jest.setup.js:2:15)

I added this to my jest.config, but does not resolve the issue:

moduleNameMapper: {
		"react-dom/server": "preact-render-to-string",
		"react-dom/test-utils": "preact-test-utils",
		"react-dom": "preact-compat-enzyme",
		"^react-test-renderer/shallow$": "preact-test-utils"
		"react-test-renderer": "preact-test-utils",
		"react-addons-test-utils": "preact-test-utils",
		"react-addons-transition-group": "preact-transition-group",
		"react": "preact-compat-enzyme"
	}