[Experimental] Add useInsertionEffect #21913
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I’d say effect lists were the usual cause of bugs so you have a higher chance of doing it right with the current approach! |
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packages/react-reconciler/src/__tests__/ReactHooksWithNoopRenderer-test.js
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@rickhanlonii just curious is the point of having this hook is to handle something even earlier than |
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@windmaomao I updated the description with the use case 👍 |
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Overview
Adds back the experimental
useMutationEffecthook asuseInsertionEffect, initially intended for stylesheet libraries.Semantics
This hook is called right before mutations are made to the host, to allow inserting dependencies of the soon-to-be mutated host nodes. The canonical example use case is for inserting styles into the DOM so that they're available before reading layout information from DOM nodes that they apply to (like reading height in
useLayoutEffect). Since this hook is limited in scope, this hook does not have access to refs and cannot schedule updates.The lifecycle of this hook is a little different than other hooks.
useInsertionEffectwill interleave create and destroy while traversing the tree in the beforeMutation phase. This means that as we traverse the tree before mutations (e.g. the same time we callgetSnapshotBeforeUpdate), and for each component we will destroy all of the insertion effects and then create all of the insertion effects for that component.The resulting in ordering is something like:
Contrast this with layout effects, which do a two passes. One to destroy all of the layout effects in every component, and a second to create them: