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fix(react): prevent error when an outlet unmounts before it's ready - #31517
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OS-jacobbell
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Oct 2, 2026
| import { ionPageVisible, withTestingMode } from './utils/test-utils'; | ||
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| test.describe('Outlet Unmount Before Ready', () => { | ||
| test('does not throw when an ionPage outlet unmounts before it is ready', async ({ page }, testInfo) => { |
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These usually say "should," right?
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Issue number: resolves #31513
What is the current behavior?
Currently, an
IonRouterOutletwithionPagethat unmounts before itscomponentOnReadycallback fires throwsCannot read properties of null (reading 'classList'), because React has already cleared the ref the callback reads inOutletPageManager.What is the new behavior?
We now capture the outlet element when the callback is scheduled and skip the callback if the ref no longer points to it, so an unmounted outlet doesn't touch its classes or register with the parent stack.
Does this introduce a breaking change?
Other information
The new test page mounts an outlet and removes it in a layout effect, which reproduces the error on every tap on
main.Current dev build