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@matyax
Created March 5, 2020 01:01
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Errors with testing-library/react@beta
TypeError: MutationObserver is not a constructor
at node_modules/@testing-library/react/node_modules/@testing-library/dom/dist/wait.js:35:22
at wait (node_modules/@testing-library/react/node_modules/@testing-library/dom/dist/wait.js:28:10)
at node_modules/@testing-library/react/node_modules/@testing-library/dom/dist/wait.js:67:54
at node_modules/@testing-library/react/dist/pure.js:51:22
at batchedUpdates$1 (node_modules/react-dom/cjs/react-dom.development.js:24353:12)
at act (node_modules/react-dom/cjs/react-dom-test-utils.development.js:1090:14)
at asyncAct (node_modules/@testing-library/react/dist/act-compat.js:118:12)
at Object.asyncWrapper (node_modules/@testing-library/react/dist/pure.js:50:35)
at waitWrapper (node_modules/@testing-library/react/node_modules/@testing-library/dom/dist/wait.js:67:35)
ReferenceError: Cannot access 'observer' before initialization
at Immediate.<anonymous> (node_modules/@testing-library/react/node_modules/@testing-library/dom/dist/wait.js:42:49)
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