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Jest: MutationObserver is not a constructor #724

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jantimon opened this issue May 20, 2020 · 1 comment
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Jest: MutationObserver is not a constructor #724

jantimon opened this issue May 20, 2020 · 1 comment
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kind: support Asking for support with something or a specific use case scope: dependencies Pull requests that update a dependency file solution: duplicate This issue or pull request already exists solution: workaround available There is a workaround available for this issue
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v0.16.0 - TS 4.0,...

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@jantimon
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Can we please upgrade jest to fix this problem?
testing-library/react-testing-library#662
@agilgur5
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agilgur5 commented May 23, 2020 •
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As that issue says, you need to supply some polyfill or configure JSDOM. You can already do that in Jest 24. I do not know what versions of JSDOM support MutationObserver, but if you want to use JSDOM 16, you can install and configure jest-environment-jsdom-sixteen per the docs.

A breaking upgrade for Jest 25 and a few other deps is already slated for v0.14.0 and there is already a PR for it. Jest 25 uses JSDOM 15 by default however, not 16, so I do not know if that supports your use case or not.
Jest 26 is still very recent and support is TBD because it also requires TS 3.8+ which breaks a number of dependencies

@agilgur5 agilgur5 added solution: duplicate This issue or pull request already exists kind: support Asking for support with something or a specific use case labels May 23, 2020
@agilgur5 agilgur5 mentioned this issue Jul 27, 2020
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@agilgur5 agilgur5 added scope: dependencies Pull requests that update a dependency file solution: workaround available There is a workaround available for this issue labels Oct 22, 2020
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kind: support Asking for support with something or a specific use case scope: dependencies Pull requests that update a dependency file solution: duplicate This issue or pull request already exists solution: workaround available There is a workaround available for this issue
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