{
  "version": 3,
  "sources": ["../../src/editorbar/engine/OnPageEngineSignals.ts"],
  "sourcesContent": ["import { assert } from \"@framerjs/shared\"\nimport {\n\tcomputed as createComputed,\n\teffect as createEffect,\n\tsignal as createSignal,\n\tendBatch,\n\tstartBatch,\n} from \"alien-signals\"\nimport type { BaseEngineScheduler } from \"document/base-engine/BaseEngine.ts\"\nimport { type DependencyList, useMemo, useSyncExternalStore } from \"react\"\nimport { isUndefined } from \"utils/typeChecks.ts\"\n\ntype Equals<Value> = (a: Value, b: Value) => boolean\n\ninterface EngineClass {\n\tscheduler: Pick<BaseEngineScheduler, \"signalChanges\">\n}\n\ntype State<Value> = ReturnType<typeof createSignal<Value>>\n\n/**\n * A decorator to create a state signal. Optionally accepts a custom equality function to avoid\n * unnecessary updates.\n */\nexport function state<This extends EngineClass, Value>(equals: Equals<Value> = Object.is) {\n\treturn (\n\t\t_target: ClassAccessorDecoratorTarget<This, Value>,\n\t\t_context: ClassAccessorDecoratorContext<This, Value>,\n\t): ClassAccessorDecoratorResult<This, Value> => {\n\t\tconst signals = new WeakMap<This, State<Value>>()\n\n\t\treturn {\n\t\t\tget(): Value {\n\t\t\t\tconst signal = signals.get(this)\n\t\t\t\tassert(signal, \"Signal must exist\")\n\t\t\t\treturn signal()\n\t\t\t},\n\n\t\t\tset(value: Value) {\n\t\t\t\tconst signal = signals.get(this)\n\t\t\t\tassert(signal, \"Signal must exist\")\n\n\t\t\t\tconst current = signal()\n\t\t\t\tif (equals(current, value)) return\n\n\t\t\t\tthis.scheduler.signalChanges(this)\n\n\t\t\t\treturn signal(value)\n\t\t\t},\n\n\t\t\tinit(value) {\n\t\t\t\tconst signal = createSignal(value)\n\t\t\t\tsignals.set(this, signal)\n\t\t\t\treturn undefined as Value\n\t\t\t},\n\t\t}\n\t}\n}\n\ntype Computed<Value> = ReturnType<typeof createComputed<Value>>\n\ntype ClassGetterDecoratorTarget<This, Value> = (this: This) => Value\ntype ClassGetterDecoratorResult<This, Value> = (this: This) => Value\n\n/**\n * A decorator to create a computed signal. Can be used to create derived state based on other\n * signals. Optionally accepts a custom equality function to avoid unnecessary updates.\n */\nexport function computed<This extends EngineClass, Value>(equals: Equals<Value> = Object.is) {\n\treturn (\n\t\ttarget: ClassGetterDecoratorTarget<This, Value>,\n\t\t_context: ClassGetterDecoratorContext<This, Value>,\n\t): ClassGetterDecoratorResult<This, Value> => {\n\t\tconst signals = new WeakMap<This, Computed<Value>>()\n\n\t\treturn function (this: This): Value {\n\t\t\tconst existing = signals.get(this)\n\t\t\tif (existing) return existing()\n\n\t\t\tconst signal = createComputed<Value>(previous => {\n\t\t\t\tconst value = target.call(this)\n\n\t\t\t\tif (isUndefined(previous)) return value\n\t\t\t\tif (equals(previous, value)) return previous\n\n\t\t\t\treturn value\n\t\t\t})\n\n\t\t\tsignals.set(this, signal)\n\t\t\treturn signal()\n\t\t}\n\t}\n}\n\n/**\n * A hook to listen to store state created with the `@state` and `@computed` decorators. Optionally\n * accepts a custom equality function to avoid unnecessary re-renders.\n *\n * @example\n * const value = useSignalState(() => engine.stores.store.value, [])\n *\n * @example\n * const value = useSignalState(() => engine.stores.store.value, [], isShallowEqual)\n *\n * @example\n * const value = useSignalState(() => engine.stores.store.value + value, [value])\n */\nexport function useSignalState<Value>(\n\tcompute: () => Value,\n\tdependencies: DependencyList,\n\tequals: Equals<NoInfer<Value>> = Object.is,\n): Value {\n\t// biome-ignore lint/correctness/useExhaustiveDependencies: Covered by dependencies.\n\tconst store = useMemo(() => {\n\t\tconst signal = createComputed<Value>(previous => {\n\t\t\tconst value = compute()\n\n\t\t\tif (isUndefined(previous)) return value\n\t\t\tif (equals(previous, value)) return previous\n\n\t\t\treturn value\n\t\t})\n\n\t\treturn {\n\t\t\tsubscribe(callback: () => void) {\n\t\t\t\treturn createEffect(() => {\n\t\t\t\t\tsignal()\n\t\t\t\t\tcallback()\n\t\t\t\t})\n\t\t\t},\n\n\t\t\tgetSnapshot() {\n\t\t\t\treturn signal()\n\t\t\t},\n\t\t}\n\t}, [...dependencies, equals])\n\n\treturn useSyncExternalStore(store.subscribe, store.getSnapshot)\n}\n\n/**\n * Starts a batch of signal changes. Should be called once per engine frame inside `signalChanges`.\n * Without this all signals will notify their subscribers immediately causing `useSignalState` to\n * render outside of the engine frame.\n */\nexport function startSignalBatch() {\n\tstartBatch()\n}\n\n/**\n * Ends a batch of signal changes. Should be called once at the end of the engine frame to render\n * all pending `useSignalState` hooks.\n */\nexport function endSignalBatch() {\n\tendBatch()\n}\n"],
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