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This lifecycle is invoked after an error has been thrown by a descendant component.
Error boundaries catch errors during rendering, in lifecycle methods,
and in constructors of the whole tree under them. For a visual reference,
check out this lifecycle diagram. This lifecycle was beforehand named componentWillUpdate.
It assumes you’re acquainted with fundamental React concepts, resembling Elements and Props,
as well as State and Lifecycle. You may be taught more about migrating away from legacy lifecycle strategies
in this weblog submit. Read our blog post on avoiding derived state to learn about
what to do when you think you need some state to depend upon the props.
If it is advisable to set the state primarily based on the previous
state, read concerning the updater argument under.
It should return an object to update the state,
or null to replace nothing. Use this as a chance to carry out preparation earlier than an update happens.
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