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{ invariant } from '../../jsutils/invariant.ts';\nimport { isPromise } from '../../jsutils/isPromise.ts';\nimport type { PromiseOrValue } from '../../jsutils/PromiseOrValue.ts';\nimport { promiseWithResolvers } from '../../jsutils/promiseWithResolvers.ts';\n\nimport { withConcurrentAbruptClose } from '../withConcurrentAbruptClose.ts';\n\ntype Settled<T> =\n  | { status: 'fulfilled'; value: T }\n  | { status: 'rejected'; reason: unknown };\n\ninterface ItemEntry<T> {\n  kind: 'item';\n  settled?: Settled<T>;\n}\n\ninterface StopEntry {\n  kind: 'stop';\n}\n\ntype Entry<T> = ItemEntry<T> | StopEntry;\n\ninterface BatchRequest<T> {\n  resolve: (generator: Generator<T> | undefined) => void;\n  reject: (reason: unknown) => void;\n}\n\ninterface QueueExecutorOptions<T> {\n  push: (item: PromiseOrValue<T>) => PromiseOrValue<void>;\n  stop: (reason?: unknown) => PromiseOrValue<void>;\n  onStop: (cleanup: (reason?: unknown) => PromiseOrValue<void>) => void;\n  started: Promise<void>;\n}\n\n/**\n * A Queue is a lightweight async-generator primitive inspired by Brian Kim's\n * Repeater (https://repeater.js.org, https://github.com/repeaterjs/repeater).\n * The ergonomics are similar, but this implementation favors clarity over\n * performance and gives producers flexibility to remain lazy, become eager, or\n * live somewhere in between.\n *\n * The constructor takes an executor function and an optional `initialCapacity`.\n * Executors receive `{ push, stop, onStop, started }` and may return `void` or\n * a promise if they perform asynchronous setup. They call `push` whenever\n * another item is ready, call `stop` when no more values will be produced\n * (optionally supplying an error), register stop-time cleanup via `onStop`,\n * and await `started` when setup should run only after iteration begins.\n * Because `push`, `stop`, and `onStop` are plain functions, executors can\n * hoist them into outside scopes or pass them to helpers. If the executor\n * throws or its returned promise rejects, the queue treats it as `stop(error)`\n * and propagates the failure.\n *\n * The `initialCapacity` argument (default `1`) governs backpressure. Capacity\n * is the maximum number of buffered items allowed before a push must wait.\n * When the backlog reaches capacity, `push` returns a promise that settles\n * once consumption releases space; otherwise it returns `undefined`. Setting\n * capacity to `1` yields a fully lazy queue (every push waits unless a prior\n * item has been consumed); higher capacities buffer that many items eagerly.\n * Capacity can be changed later via `setCapacity` and observed via\n * `getCapacity`.\n *\n * `subscribe(reducer)` returns an async generator whose batches feed a generator\n * of settled values into the reducer; whatever the reducer returns (other than\n * `undefined`) becomes the yielded value for that batch. Calling `return()` on\n * the subscription settles pending `next` calls thanks to `withConcurrent`,\n * providing direct abort semantics rather than leaving `next()` suspended.\n *\n * 'forEachBatch(reducer)` is a convenience method that subscribes with the\n * given reducer and runs it for each batch until the queue stops.\n *\n * Producers can stay lazy by awaiting `started`, using zero capacity, and\n * awaiting each `push`. Skipping those waits while raising capacity makes the\n * queue eager up to its configured limit. The `isStopped()` helper exposes\n * whether the queue has fully stopped, which can be useful when the reducer\n * function actually performs external work and wants to bail early without\n * awaiting another `next`.\n *\n * @internal\n */\nexport class Queue<T> {\n  private _capacity: number;\n  private _backlog = 0;\n  private _waiters: Array<() => void> = [];\n  private _entries: Array<Entry<T>> = [];\n  private _isStopped = false;\n  private _stopRequested = false;\n  private _stopCleanupCallbacks: Array<\n    (reason?: unknown) => PromiseOrValue<void>\n  > = [];\n  private _stopCompletion: Promise<void> | undefined;\n  private _batchRequests = new Set<BatchRequest<T>>();\n\n  private _resolveStarted: () => void;\n\n  constructor(\n    executor: ({\n      push,\n      stop,\n      onStop,\n      started,\n    }: QueueExecutorOptions<T>) => PromiseOrValue<void>,\n    initialCapacity = 1,\n  ) {\n    this._capacity = this._normalizeCapacity(initialCapacity);\n\n    const { promise: started, resolve: resolveStarted } =\n      // eslint-disable-next-line @typescript-eslint/no-invalid-void-type\n      promiseWithResolvers<void>();\n\n    this._resolveStarted = resolveStarted;\n\n    try {\n      const result = executor({\n        push: this._push.bind(this),\n        stop: this._stop.bind(this),\n        onStop: this._onStop.bind(this),\n        started,\n      });\n      if (isPromise(result)) {\n        result.catch(this._stop.bind(this));\n      }\n    } catch (error) {\n      const stopped = this._stop(error);\n      if (isPromise(stopped)) {\n        /* node:coverage ignore next */\n        stopped.catch(() => undefined);\n      }\n    }\n  }\n\n  subscribe<U>(\n    reducer: (\n      generator: Generator<T, void, void>,\n    ) => PromiseOrValue<U | undefined> = (generator) =>\n      Array.from(generator) as U,\n  ): AsyncGenerator<U, void, void> {\n    const generator = this._iteratorLoop(reducer);\n    return withConcurrentAbruptClose(\n      generator,\n      () => this.cancel(),\n      this.abort.bind(this),\n    );\n  }\n\n  cancel(): PromiseOrValue<void> {\n    if (this._stopRequested) {\n      return this._stopCompletion;\n    }\n    return this._terminate(undefined, () => {\n      this._isStopped = true;\n      this._batchRequests.forEach((request) => request.resolve(undefined));\n      this._batchRequests.clear();\n    });\n  }\n\n  abort(reason?: unknown): PromiseOrValue<void> {\n    if (this._stopRequested) {\n      return this._stopCompletion;\n    }\n    return this._terminate(reason, () => {\n      this._isStopped = true;\n      if (this._batchRequests.size) {\n        this._batchRequests.forEach((request) => request.reject(reason));\n        this._batchRequests.clear();\n        return;\n      }\n      // save rejection for later batch requests\n      this._entries.push({\n        kind: 'item',\n        settled: { status: 'rejected', reason },\n      });\n    });\n  }\n\n  async forEachBatch(\n    reducer: (generator: Generator<T, void, void>) => PromiseOrValue<void>,\n  ): Promise<void> {\n    const sub = this.subscribe(async (generator) => {\n      const { promise: drained, resolve } =\n        // eslint-disable-next-line @typescript-eslint/no-invalid-void-type\n        promiseWithResolvers<void>();\n\n      const wrappedBatch = (function* wrapper(): Generator<T> {\n        yield* generator;\n        resolve();\n      })();\n\n      await Promise.all([reducer(wrappedBatch), drained]);\n    });\n\n    // Empty loop body is intentionally used to drain the subscription.\n    /* node:coverage ignore next 3 */\n    for await (const _ of sub) {\n      // intentionally empty\n    }\n  }\n\n  setCapacity(nextCapacity: number): void {\n    this._capacity = this._normalizeCapacity(nextCapacity);\n    this._flush();\n  }\n\n  getCapacity(): number {\n    return this._capacity;\n  }\n\n  isStopped(): boolean {\n    return this._isStopped;\n  }\n\n  private _normalizeCapacity(capacity: number): number {\n    return Math.max(1, Math.floor(capacity));\n  }\n\n  private _flush(): void {\n    while (this._waiters.length > 0 && this._backlog < this._capacity) {\n      this._waiters.shift()?.();\n    }\n  }\n\n  private _reserve(): PromiseOrValue<void> {\n    this._backlog += 1;\n    if (this._backlog < this._capacity) {\n      return undefined;\n    }\n    // eslint-disable-next-line @typescript-eslint/no-invalid-void-type\n    const { promise, resolve } = promiseWithResolvers<void>();\n    this._waiters.push(resolve);\n    return promise;\n  }\n\n  private _release(): void {\n    if (this._backlog > 0) {\n      this._backlog -= 1;\n    }\n    this._flush();\n  }\n\n  private _onStop(cleanup: (reason?: unknown) => PromiseOrValue<void>): void {\n    if (this._stopRequested) {\n      throw new Error(\n        'Cannot register onStop cleanup after stop has been requested.',\n      );\n    }\n    this._stopCleanupCallbacks.push(cleanup);\n  }\n\n  private _runStopCleanup(\n    reason: unknown,\n    afterCleanup: () => void,\n  ): PromiseOrValue<void> {\n    this._stopRequested = true;\n    const cleanupPromises = this._stopCleanupCallbacks.flatMap(\n      (cleanupCallback): Array<Promise<unknown>> => {\n        try {\n          const result = cleanupCallback(reason);\n          return isPromise(result) ? [result] : [];\n        } catch {\n          // ignore errors\n          return [];\n        }\n      },\n    );\n    const cleanup =\n      cleanupPromises.length > 0\n        ? Promise.allSettled(cleanupPromises).then(() => undefined)\n        : undefined;\n    if (isPromise(cleanup)) {\n      this._stopCompletion = cleanup\n        .then(afterCleanup, afterCleanup)\n        .then(() => undefined);\n      return this._stopCompletion;\n    }\n    afterCleanup();\n  }\n\n  private async *_iteratorLoop<U>(\n    reducer: (\n      generator: Generator<T, void, void>,\n    ) => PromiseOrValue<U | undefined>,\n  ): AsyncGenerator<U, void, void> {\n    this._resolveStarted();\n    let nextBatch: Generator<T> | undefined;\n    // eslint-disable-next-line no-await-in-loop\n    while ((nextBatch = await this._waitForNextBatch())) {\n      let reduced = reducer(nextBatch);\n      if (isPromise(reduced)) {\n        // eslint-disable-next-line no-await-in-loop\n        reduced = await reduced;\n      }\n      if (reduced === undefined) {\n        continue;\n      }\n      yield reduced;\n    }\n  }\n\n  private _waitForNextBatch(): Promise<Generator<T> | undefined> {\n    const { promise, resolve, reject } = promiseWithResolvers<\n      Generator<T> | undefined\n    >();\n    this._batchRequests.add({ resolve, reject });\n    this._deliverBatchIfReady();\n    return promise;\n  }\n\n  private _push(item: PromiseOrValue<T>): PromiseOrValue<void> {\n    if (this._stopRequested) {\n      return;\n    }\n    const maybePushPromise = this._reserve();\n    if (isPromise(item)) {\n      const entry: ItemEntry<T> = { kind: 'item' };\n      this._entries.push(entry);\n      item.then(\n        (resolved) => {\n          entry.settled = { status: 'fulfilled', value: resolved };\n          this._deliverBatchIfReady();\n        },\n        (reason: unknown) => {\n          entry.settled = { status: 'rejected', reason };\n          this._deliverBatchIfReady();\n        },\n      );\n    } else {\n      this._entries.push({\n        kind: 'item',\n        settled: { status: 'fulfilled', value: item },\n      });\n      this._deliverBatchIfReady();\n    }\n    return maybePushPromise;\n  }\n\n  private _terminate(\n    reason: unknown,\n    afterCleanup: () => void,\n  ): PromiseOrValue<void> {\n    for (const entry of this._entries) {\n      if (entry.kind === 'item') {\n        this._release();\n      }\n    }\n    this._entries.length = 0;\n    return this._runStopCleanup(reason, afterCleanup);\n  }\n\n  private _stop(reason?: unknown): PromiseOrValue<void> {\n    if (this._stopRequested) {\n      return this._stopCompletion;\n    }\n    const stopCompletion = this._runStopCleanup(reason, () => {\n      if (reason === undefined) {\n        if (this._entries.length === 0) {\n          this._isStopped = true;\n          this._deliverBatchIfReady();\n          return;\n        }\n\n        this._entries.push({ kind: 'stop' });\n        this._deliverBatchIfReady();\n        return;\n      }\n\n      this._entries.push({\n        kind: 'item',\n        settled: { status: 'rejected', reason },\n      });\n      this._entries.push({ kind: 'stop' });\n      this._deliverBatchIfReady();\n    });\n\n    if (isPromise(stopCompletion)) {\n      /* node:coverage ignore next */\n      stopCompletion.catch(() => undefined);\n    }\n    return stopCompletion;\n  }\n\n  private _deliverBatchIfReady(): void {\n    if (!this._batchRequests.size) {\n      return;\n    }\n    const headEntry = this._entries[0];\n    const requests = this._batchRequests;\n    if (headEntry !== undefined) {\n      // stop sentinel always follows other work\n      invariant(headEntry.kind !== 'stop');\n\n      const settled = headEntry.settled;\n      if (settled !== undefined) {\n        if (settled.status === 'fulfilled') {\n          this._batchRequests = new Set();\n          requests.forEach((request) => request.resolve(this._drainBatch()));\n          return;\n        }\n        this._entries.shift();\n        this._release();\n        this._isStopped = true;\n        this._batchRequests = new Set();\n        requests.forEach((request) => request.reject(settled.reason));\n      }\n    } else if (this._isStopped) {\n      this._batchRequests = new Set();\n      requests.forEach((request) => request.resolve(undefined));\n    }\n  }\n\n  private *_drainBatch(): Generator<T> {\n    while (true) {\n      const entry = this._entries[0];\n      if (entry === undefined) {\n        return;\n      }\n      if (entry.kind === 'stop') {\n        this._isStopped = true;\n        this._entries.shift();\n        return;\n      }\n      const settled = entry.settled;\n      if (settled === undefined || settled.status === 'rejected') {\n        return;\n      }\n      this._entries.shift();\n      this._release();\n      yield settled.value;\n    }\n  }\n}\n"]}