[flow] Upgrade from 0.282 -> 0.286 #35332
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Flow 0.280 introduced stricter type checking for `incompatible-type` errors, requiring additional $FlowFixMe suppressions alongside existing ones. Changes: - Made `QueuingStrategy` properties optional in streams.js - Made all properties optional in Web Animations API types (EffectTiming, KeyframeAnimationOptions, etc.) - Added `$FlowFixMe[incompatible-type]` alongside existing suppressions in multiple files where Flow now reports additional type mismatches
Major changes in Flow 0.281: - $FlowFixMe comments now require explicit error codes (e.g., $FlowFixMe[incompatible-type]) - Changed all bare $FlowFixMe to include appropriate error codes - Changed $FlowIgnore to $FlowFixMe where needed - Fixed stream types to have cancel() return Promise<void> instead of void - Added pseudoElement property to KeyframeEffect type - Added suppressions for Proxy handler variance issues - Fixed various type errors across the codebase
Add suppression for React\$Element incompatibility with ReactNodeList in ReactDOMRootFB.js render function. Flow 0.282 has stricter type checking for the React\$Node union type.
Flow 0.286 introduced stricter constant-condition detection that flags build-time feature flags (supportsMutation, supportsHydration, isPrimaryRenderer, enableProfiling, etc.) and narrowed null checks. Added inline $FlowFixMe suppressions to preserve existing runtime behavior.
This was referenced Dec 8, 2025
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Flow 0.286 introduced stricter constant-condition detection that flags build-time feature flags (supportsMutation, supportsHydration, isPrimaryRenderer, enableProfiling, etc.) and narrowed null checks. Added inline $FlowFixMe suppressions to preserve existing runtime behavior.
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