[compiler] Rewrite effect dep arrays that use fire #31811
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Config flag for `fire` --
Makes `fire` a known export for type-based analysis --
This was referenced Dec 16, 2024
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jbrown215
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Config flag for `fire` -- --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/31794). * #31811 * #31798 * #31797 * #31796 * #31795 * __->__ #31794
jbrown215
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Makes `fire` a known export for type-based analysis -- --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/31795). * #31811 * #31798 * #31797 * #31796 * __->__ #31795 * #31794
This is the diff with the meaningful changes. The approach is: 1. Collect fire callees and remove fire() calls, create a new binding for the useFire result 2. Update LoadLocals for captured callees to point to the useFire result 3. Update function context to reference useFire results 4. Insert useFire calls after getting to the component scope This approach aims to minimize the amount of new bindings we introduce for the function expressions to minimize bookkeeping for dependency arrays. We keep all of the LoadLocals leading up to function calls as they are and insert new instructions to load the originally captured function, call useFire, and store the result in a new promoted temporary. The lvalues that referenced the original callee are changed to point to the new useFire result. This is the minimal diff to implement the expected behavior (up to importing the useFire call, next diff) and further stacked diffs implement error handling. The rules for fire are: 1. If you use fire for a callee in the effect once you must use it for every time you call it in that effect 2. You can only use fire in a useEffect lambda/functions defined inside the useEffect lambda There is still more work to do here, like updating the effect dependency array and handling object methods --
Summary:
Adds import {useFire} from 'react' when fire syntax is used.
This is experimentation and may not become a stable feature in the compiler.
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…tion Traverse the compiled functions to ensure there are no lingering fires and that all fire calls are inside an effect lambda. --
If an effect uses a dep array, also rewrite the dep array to use the fire binding --
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If an effect uses a dep array, also rewrite the dep array to use the fire binding
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Stack created with Sapling. Best reviewed with ReviewStack.