Implement STATE_DELTA for partial state updates#52
Merged
MarcosBrendonDePaula merged 2 commits intomainfrom Feb 12, 2026
Merged
Implement STATE_DELTA for partial state updates#52MarcosBrendonDePaula merged 2 commits intomainfrom
MarcosBrendonDePaula merged 2 commits intomainfrom
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Instead of sending the entire state object on every mutation, Live Components now emit STATE_DELTA with only the changed properties. This reduces WebSocket payload size and bandwidth usage, especially for components with large state objects. - Server proxy set trap: emits delta with single changed property - Server setState(): emits delta with partial updates - Client: merges STATE_DELTA into existing state via shallow merge - Full STATE_UPDATE preserved for mount/rehydrate scenarios https://claude.ai/code/session_01HB4ENmFebWTsco9UMa1z3D
16 tests covering: - Proxy set emits STATE_DELTA with only changed property - setState emits STATE_DELTA with partial updates (single message) - No emit when value is unchanged - Function updater form support - Internal state consistency after delta mutations - Action-driven state changes via proxy and setState - Message format (componentId, timestamp) https://claude.ai/code/session_01HB4ENmFebWTsco9UMa1z3D
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Summary
This PR introduces a new
STATE_DELTAmessage type to optimize WebSocket payload size by sending only changed state properties instead of the full state object on every mutation.Key Changes
STATE_DELTAtoLiveMessageandWebSocketResponsetypes intypes.tsLiveComponentto emitSTATE_DELTAwith only the changed property instead of fullSTATE_UPDATEsetState()method to emitSTATE_DELTAcontaining only the properties that were actually modifiedSTATE_DELTAcase inuseLiveComponenthook to merge delta updates with existing stateImplementation Details
setState()emits a singleSTATE_DELTAmessage with all batch updates, reducing message count for multi-property changescomponentIdandtimestampfor proper routing and debugginghttps://claude.ai/code/session_01HB4ENmFebWTsco9UMa1z3D