@trpc/server/dist/observable-CkXWrCsV.mjs.map

The tRPC server library

{"version":3,"file":"observable-CkXWrCsV.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    // True while `source.subscribe` runs, so subscribers added by a synchronous\n    // `next` join the starting source instead of starting another one\n    let isConnecting = false;\n    let observers = new Set<Partial<Observer<TValue, TError>>>();\n\n    function startIfNeeded() {\n      if (subscription || isConnecting) {\n        return;\n      }\n      isConnecting = true;\n      let isDone = false;\n      let sourceSubscription: Unsubscribable;\n      try {\n        sourceSubscription = source.subscribe({\n          next(value) {\n            notify(observers, (observer) => observer.next?.(value));\n          },\n          error(error) {\n            isDone = true;\n            terminate((observer) => observer.error?.(error));\n          },\n          complete() {\n            isDone = true;\n            terminate((observer) => observer.complete?.());\n          },\n        });\n      } finally {\n        isConnecting = false;\n      }\n      // A synchronous terminal event fires before `subscribe` returns, and its\n      // callbacks may already have started a new source\n      if (isDone) {\n        sourceSubscription.unsubscribe();\n      } else {\n        subscription = sourceSubscription;\n      }\n    }\n    function notify(\n      targets: Set<Partial<Observer<TValue, TError>>>,\n      callback: (observer: Partial<Observer<TValue, TError>>) => void,\n    ) {\n      for (const observer of [...targets]) {\n        if (targets.has(observer)) {\n          callback(observer);\n        }\n      }\n    }\n    function terminate(\n      callback: (observer: Partial<Observer<TValue, TError>>) => void,\n    ) {\n      // Cleared before notifying so a subscriber added during the callback\n      // starts a fresh source whose events reach only the observers that\n      // joined it; the old source is torn down only after every observer has\n      // been notified, mirroring subscription order.\n      const _sub = subscription;\n      const terminatedObservers = observers;\n      subscription = null;\n      observers = new Set();\n      isConnecting = false;\n      try {\n        notify(terminatedObservers, callback);\n      } finally {\n        _sub?.unsubscribe();\n      }\n    }\n    function resetSource() {\n      const _sub = subscription;\n      subscription = null;\n      _sub?.unsubscribe();\n    }\n    function resetIfNeeded() {\n      // \"resetOnRefCountZero\"\n      if (refCount === 0 && subscription) {\n        resetSource();\n      }\n    }\n\n    return observable((subscriber) => {\n      refCount++;\n\n      const subscriberObservers = observers;\n      subscriberObservers.add(subscriber);\n      startIfNeeded();\n      return {\n        unsubscribe() {\n          refCount--;\n          resetIfNeeded();\n\n          subscriberObservers.delete(subscriber);\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      observer.next(nextValue);\n    }\n  };\n\n  obs.get = () => value;\n\n  return 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