State Reactions

Comparable to: Firebase onSnapshot, Convex mutations

Key Concepts

Use the concepts below when they fit the task. Not every state reaction needs all of them.

• A state trigger fires whenever a value changes within a watched scope
• The handler receives { new_value, old_value, key, event_type } describing the change
• condition_function_id gates execution — the reaction only fires if the condition returns truthy
• Multiple reactions can independently watch the same scope
• Reactions fire on state::set, state::update, and state::delete operations

Architecture