[SamChou19815]

Flow's experimental.require_function_type_param_name option requires every function type param to be named, as TypeScript does:

type T = (string) => void; // error
type T = (v: string) => void; // ok

This names the two unnamed params that end up in the package's published .js.flow files: useElementCallback's callback and ReactRef. Param names don't affect type checking.

Test plan

flow full-check with Flow 0.338.0, using a copy of .flowconfig updated for 0.338 with the option turned on: the two missing-function-type-param-name errors in useElementCallback.js and Utilities.js are gone, and no other errors change.

[github-actions]

workflow: benchmarks/perf (native)

Comparison of performance test results, measured in operations per second. Larger is better.

Results	Base	Patch	Ratio
css.create
· small	1,876,738	1,918,826	1.02	+
· small with units	888,088	920,408	1.04	+
· small with variables	1,121,222	1,176,409	1.05	+
· several small	623,447	642,878	1.03	+
· large	350,816	357,938	1.02	+
· large with polyfills	255,475	266,158	1.04	+
· complex	179,262	181,770	1.01	+
· unsupported	386,905	386,939	1.00	+
css.createTheme
· simple theme	403,902	424,833	1.05	!!
· polyfill theme	405,124	394,781	0.97	-

[github-actions]

workflow: benchmarks/size

Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.

Results	Base	Patch	Ratio
react-strict-dom/dist/web/index.js
· compressed	3,251	3,251	1.00
· minified	10,375	10,375	1.00
react-strict-dom/dist/web/runtime.js
· compressed	1,645	1,645	1.00
· minified	4,131	4,131	1.00
react-strict-dom/dist/native/index.js
· compressed	16,850	16,850	1.00
· minified	65,487	65,487	1.00
react-strict-animated/dist/web/index.js
· compressed	6,861	6,861	1.00
· minified	23,486	23,486	1.00
react-strict-animated/dist/native/index.js
· compressed	797	797	1.00
· minified	2,518	2,518	1.00