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@trpc/server

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The tRPC server library

trpc.io

trpc/trpc

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{"version":3,"file":"observable-CSprJVOf.mjs","names":[],"sources":["../src/observable/operators.ts","../src/observable/behaviorSubject.ts"],"sourcesContent":["import { observable } from './observable';\nimport type {\n MonoTypeOperatorFunction,\n Observer,\n OperatorFunction,\n Unsubscribable,\n} from './types';\n\nexport function map<TValueBefore, TError, TValueAfter>(\n project: (value: TValueBefore, index: number) => TValueAfter,\n): OperatorFunction<TValueBefore, TError, TValueAfter, TError> {\n return (source) => {\n return observable((destination) => {\n let index = 0;\n const subscription = source.subscribe({\n next(value) {\n destination.next(project(value, index++));\n },\n error(error) {\n destination.error(error);\n },\n complete() {\n destination.complete();\n },\n });\n return subscription;\n });\n };\n}\n\ninterface ShareConfig {}\nexport function share<TValue, TError>(\n _opts?: ShareConfig,\n): MonoTypeOperatorFunction<TValue, TError> {\n return (source) => {\n let refCount = 0;\n\n let subscription: Unsubscribable | null = null;\n const observers: Partial<Observer<TValue, TError>>[] = [];\n\n function startIfNeeded() {\n if (subscription) {\n return;\n }\n subscription = source.subscribe({\n next(value) {\n for (const observer of observers) {\n observer.next?.(value);\n }\n },\n error(error) {\n for (const observer of observers) {\n observer.error?.(error);\n }\n },\n complete() {\n for (const observer of observers) {\n observer.complete?.();\n }\n },\n });\n }\n function resetIfNeeded() {\n // \"resetOnRefCountZero\"\n if (refCount === 0 && subscription) {\n const _sub = subscription;\n subscription = null;\n _sub.unsubscribe();\n }\n }\n\n return observable((subscriber) => {\n refCount++;\n\n observers.push(subscriber);\n startIfNeeded();\n return {\n unsubscribe() {\n refCount--;\n resetIfNeeded();\n\n const index = observers.findIndex((v) => v === subscriber);\n\n if (index > -1) {\n observers.splice(index, 1);\n }\n },\n };\n });\n };\n}\n\nexport function tap<TValue, TError>(\n observer: Partial<Observer<TValue, TError>>,\n): MonoTypeOperatorFunction<TValue, TError> {\n return (source) => {\n return observable((destination) => {\n return source.subscribe({\n next(value) {\n observer.next?.(value);\n destination.next(value);\n },\n error(error) {\n observer.error?.(error);\n destination.error(error);\n },\n complete() {\n observer.complete?.();\n destination.complete();\n },\n });\n });\n };\n}\n\nconst distinctUnsetMarker = Symbol();\nexport function distinctUntilChanged<TValue, TError>(\n compare: (a: TValue, b: TValue) => boolean = (a, b) => a === b,\n): MonoTypeOperatorFunction<TValue, TError> {\n return (source) => {\n return observable((destination) => {\n let lastValue: TValue | typeof distinctUnsetMarker = distinctUnsetMarker;\n\n return source.subscribe({\n next(value) {\n if (lastValue !== distinctUnsetMarker && compare(lastValue, value)) {\n return;\n }\n lastValue = value;\n destination.next(value);\n },\n error(error) {\n destination.error(error);\n },\n complete() {\n destination.complete();\n },\n });\n });\n };\n}\n\nconst isDeepEqual = <T>(a: T, b: T): boolean => {\n if (a === b) {\n return true;\n }\n const bothAreObjects =\n a && b && typeof a === 'object' && typeof b === 'object';\n\n return (\n !!bothAreObjects &&\n Object.keys(a).length === Object.keys(b).length &&\n Object.entries(a).every(([k, v]) => isDeepEqual(v, b[k as keyof T]))\n );\n};\nexport function distinctUntilDeepChanged<\n TValue,\n TError,\n>(): MonoTypeOperatorFunction<TValue, TError> {\n return distinctUntilChanged(isDeepEqual);\n}\n","import { observable } from './observable';\nimport type { Observable, Observer } from './types';\n\nexport interface BehaviorSubject<TValue> extends Observable<TValue, never> {\n observable: Observable<TValue, never>;\n next: (value: TValue) => void;\n get: () => TValue;\n}\n\nexport interface ReadonlyBehaviorSubject<TValue> extends Omit<\n BehaviorSubject<TValue>,\n 'next'\n> {}\n\n/**\n * @internal\n * An observable that maintains and provides a \"current value\" to subscribers\n * @see https://www.learnrxjs.io/learn-rxjs/subjects/behaviorsubject\n */\nexport function behaviorSubject<TValue>(\n initialValue: TValue,\n): BehaviorSubject<TValue> {\n let value: TValue = initialValue;\n\n const observerList: Observer<TValue, never>[] = [];\n\n const addObserver = (observer: Observer<TValue, never>) => {\n if (value !== undefined) {\n observer.next(value);\n }\n observerList.push(observer);\n };\n const removeObserver = (observer: Observer<TValue, never>) => {\n observerList.splice(observerList.indexOf(observer), 1);\n };\n\n const obs = observable<TValue, never>((observer) => {\n addObserver(observer);\n return () => {\n removeObserver(observer);\n };\n }) as BehaviorSubject<TValue>;\n\n obs.next = (nextValue: TValue) => {\n if (value === nextValue) {\n return;\n }\n value = nextValue;\n for (const observer of observerList) {\n 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