Jest - CKEditorError: ckeditor-duplicated-modules

[DuIIDa]

I had this problem when running tests(Jest) after migrating from ckeditor4 to ckeditor5.

package.json

"dependencies": { ... "@ckeditor/ckeditor5-react": "^8.0.0", "ckeditor5": "^42.0.0", ... } "jest": { "resetMocks": false, "collectCoverageFrom": [ "/*.{js,jsx,ts,tsx}", "!/integration-tests/", "!/node_modules/", "!/vendor/", "!src/old/", "!src/stories/**" ], "watchPathIgnorePatterns": [ "\integration-tests\" ], "transformIgnorePatterns": [ "!node_modules/" ], "moduleNameMapper": { "\.(css|less|scss|sass)$": "identity-obj-proxy" } },

My imports:

import { Bold, Essentials, Italic, Mention, Paragraph, Undo, Underline, Strikethrough, RemoveFormat, List, BlockQuote, Link, Table, TableToolbar, Heading, } from 'ckeditor5'; import ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor'; import { CKEditor } from '@ckeditor/ckeditor5-react'; // eslint-disable-next-line import/no-unresolved import 'ckeditor5/ckeditor5.css';

I also tried importing ClassicEditor from ckeditor5.

[Witoso]

Hi! ClassicEditor should be pulled from ckeditor5 as well. What error did you see then?

[DuIIDa]

Hi! When import directly from ckeditor5 I get the same error. Imports: import { ClassicEditor, Bold, Essentials, Italic, Mention, Paragraph, Undo, Underline, Strikethrough, RemoveFormat, List, BlockQuote, Link, Table, TableToolbar, Heading, } from 'ckeditor5'; import { CKEditor } from '@ckeditor/ckeditor5-react';

[Reinmar]

Which version of @ckeditor/ckeditor5-react and ckeditor5 packages do you use? Are you sure that both are installed in the latest available versions?

Second thing to check: You should have no imports from @ckeditor/* packages expect the react one. In other words, the only imports should happen from @ckeditor/ckeditor5-react and ckeditor5.

[DuIIDa]

I tihs version:

I found a solution for myself. But I'm not sure it's correct Inside the test: jest.mock('File with CKEditor');

[Reinmar]

Based on the snippets that you provided, all seems to be correct. I have no idea why you get the dup-modules error. But it's a one that can be triggered by things that are hard to spot.

Would you be able to compile a small sample project where this issue is reproducible?

[CKEditorBot]

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[CKEditorBot]

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