Ensure function arity is preserved after build #31808
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eps1lon
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…act into issue-31578-setter-arity-gcc * 'issue-31578-setter-arity-gcc' of github.com:/davesnx/react: [flags] Clean up scheduler flags (facebook#31814) Enable debugRenderPhaseSideEffectsForStrictMode in test renderers (facebook#31761) Enable disableDefaultPropsExceptForClasses (facebook#31804) Turn on useModernStrictMode in test renderers (facebook#31769) [compiler][ez] Add shape for global Object.keys (facebook#31583) [compiler] Context variables as dependencies (facebook#31582) [compiler] Add fire to known React APIs (facebook#31795) [compiler] Add option for firing effect functions (facebook#31794) [compiler][be] Logger based debug printing in test runner (facebook#31809) [compiler][ez] Clean up duplicate code in propagateScopeDeps (facebook#31581) [compiler] Repro for aliased captures within inner function expressions (facebook#31770) [compiler][be] Playground now compiles entire program (facebook#31774) [Flight] Color and badge non-primary environments (facebook#31738) [Flight] Emit Deduped Server Components Marker (facebook#31737) [Flight] Sort Server Components Track Group ahead of Client Scheduler/Components Tracks (facebook#31736) Clean up context access profiling experiment (facebook#31806) [Flight] Stack Parallel Components in Separate Tracks (facebook#31735) Flag for requestPaint (facebook#31805)
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Co-authored-by: eps1lon <[email protected]> DiffTrain build for [2bd1c75](2bd1c75)
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Co-authored-by: eps1lon <[email protected]> DiffTrain build for [2bd1c75](2bd1c75)
This was referenced Dec 18, 2024
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Closes #31578
Closes #31598
Problem
The google closure compiler has a feature for optimizing function calls. It identifies opportunities to replace the original argument arrays with a more compact representation, such as array or replace constant arguments with their literal values.
In the case of functions that use
argumentsit added an extra parameter and caused the arity (fn.length) to differ (which became different from development to prod due to DEV).This became an issue for reason-react (and maybe other binding systems as well), since we need to bind to the interface and statically how many parameters are expected. reason-react carries the OCaml-way of being a curried language where there's no difference between
let fn = (a, b) => ...andlet fn = (a) => (b) => .... The compiler to JavaScript (Melange) has a small runtime that calls the function with the right number of parameters. This is the related issue: reasonml/reason-react#860.Solution
At first, I made it work with the
// @nocollapseannotation (https://github.com/google/closure-compiler/wiki/Annotating-JavaScript-for-the-Closure-Compiler#nocollapse), but I found out that just adding a reference is more clear on the intention of the gcc to not optimze this bit, rather than using a no-obvious annotation that seems to do the job.Thanks @eps1lon for the help