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/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ /** * The currently active consumer `ReactiveNode`, if running code in a reactive context. * * Change this via `setActiveConsumer`. */ let activeConsumer = null; let inNotificationPhase = false; /** * Global epoch counter. Incremented whenever a source signal is set. */ let epoch = 1; /** * Symbol used to tell `Signal`s apart from other functions. * * This can be used to auto-unwrap signals in various cases, or to auto-wrap non-signal values. */ export const SIGNAL = /* @__PURE__ */ Symbol('SIGNAL'); export function setActiveConsumer(consumer) { const prev = activeConsumer; activeConsumer = consumer; return prev; } export function getActiveConsumer() { return activeConsumer; } export function isInNotificationPhase() { return inNotificationPhase; } export function isReactive(value) { return value[SIGNAL] !== undefined; } export const REACTIVE_NODE = { version: 0, lastCleanEpoch: 0, dirty: false, producerNode: undefined, producerLastReadVersion: undefined, producerIndexOfThis: undefined, nextProducerIndex: 0, liveConsumerNode: undefined, liveConsumerIndexOfThis: undefined, consumerAllowSignalWrites: false, consumerIsAlwaysLive: false, producerMustRecompute: () => false, producerRecomputeValue: () => { }, consumerMarkedDirty: () => { }, consumerOnSignalRead: () => { }, }; /** * Called by implementations when a producer's signal is read. */ export function producerAccessed(node) { if (inNotificationPhase) { throw new Error(typeof ngDevMode !== 'undefined' && ngDevMode ? `Assertion error: signal read during notification phase` : ''); } if (activeConsumer === null) { // Accessed outside of a reactive context, so nothing to record. return; } activeConsumer.consumerOnSignalRead(node); // This producer is the `idx`th dependency of `activeConsumer`. const idx = activeConsumer.nextProducerIndex++; assertConsumerNode(activeConsumer); if (idx < activeConsumer.producerNode.length && activeConsumer.producerNode[idx] !== node) { // There's been a change in producers since the last execution of `activeConsumer`. // `activeConsumer.producerNode[idx]` holds a stale dependency which will be be removed and // replaced with `this`. // // If `activeConsumer` isn't live, then this is a no-op, since we can replace the producer in // `activeConsumer.producerNode` directly. However, if `activeConsumer` is live, then we need // to remove it from the stale producer's `liveConsumer`s. if (consumerIsLive(activeConsumer)) { const staleProducer = activeConsumer.producerNode[idx]; producerRemoveLiveConsumerAtIndex(staleProducer, activeConsumer.producerIndexOfThis[idx]); // At this point, the only record of `staleProducer` is the reference at // `activeConsumer.producerNode[idx]` which will be overwritten below. } } if (activeConsumer.producerNode[idx] !== node) { // We're a new dependency of the consumer (at `idx`). activeConsumer.producerNode[idx] = node; // If the active consumer is live, then add it as a live consumer. If not, then use 0 as a // placeholder value. activeConsumer.producerIndexOfThis[idx] = consumerIsLive(activeConsumer) ? producerAddLiveConsumer(node, activeConsumer, idx) : 0; } activeConsumer.producerLastReadVersion[idx] = node.version; } /** * Increment the global epoch counter. * * Called by source producers (that is, not computeds) whenever their values change. */ export function producerIncrementEpoch() { epoch++; } /** * Ensure this producer's `version` is up-to-date. */ export function producerUpdateValueVersion(node) { if (consumerIsLive(node) && !node.dirty) { // A live consumer will be marked dirty by producers, so a clean state means that its version // is guaranteed to be up-to-date. return; } if (!node.dirty && node.lastCleanEpoch === epoch) { // Even non-live consumers can skip polling if they previously found themselves to be clean at // the current epoch, since their dependencies could not possibly have changed (such a change // would've increased the epoch). return; } if (!node.producerMustRecompute(node) && !consumerPollProducersForChange(node)) { // None of our producers report a change since the last time they were read, so no // recomputation of our value is necessary, and we can consider ourselves clean. node.dirty = false; node.lastCleanEpoch = epoch; return; } node.producerRecomputeValue(node); // After recomputing the value, we're no longer dirty. node.dirty = false; node.lastCleanEpoch = epoch; } /** * Propagate a dirty notification to live consumers of this producer. */ export function producerNotifyConsumers(node) { if (node.liveConsumerNode === undefined) { return; } // Prevent signal reads when we're updating the graph const prev = inNotificationPhase; inNotificationPhase = true; try { for (const consumer of node.liveConsumerNode) { if (!consumer.dirty) { consumerMarkDirty(consumer); } } } finally { inNotificationPhase = prev; } } /** * Whether this `ReactiveNode` in its producer capacity is currently allowed to initiate updates, * based on the current consumer context. */ export function producerUpdatesAllowed() { return activeConsumer?.consumerAllowSignalWrites !== false; } export function consumerMarkDirty(node) { node.dirty = true; producerNotifyConsumers(node); node.consumerMarkedDirty?.(node); } /** * Prepare this consumer to run a computation in its reactive context. * * Must be called by subclasses which represent reactive computations, before those computations * begin. */ export function consumerBeforeComputation(node) { node && (node.nextProducerIndex = 0); return setActiveConsumer(node); } /** * Finalize this consumer's state after a reactive computation has run. * * Must be called by subclasses which represent reactive computations, after those computations * have finished. */ export function consumerAfterComputation(node, prevConsumer) { setActiveConsumer(prevConsumer); if (!node || node.producerNode === undefined || node.producerIndexOfThis === undefined || node.producerLastReadVersion === undefined) { return; } if (consumerIsLive(node)) { // For live consumers, we need to remove the producer -> consumer edge for any stale producers // which weren't dependencies after the recomputation. for (let i = node.nextProducerIndex; i < node.producerNode.length; i++) { producerRemoveLiveConsumerAtIndex(node.producerNode[i], node.producerIndexOfThis[i]); } } // Truncate the producer tracking arrays. // Perf note: this is essentially truncating the length to `node.nextProducerIndex`, but // benchmarking has shown that individual pop operations are faster. while (node.producerNode.length > node.nextProducerIndex) { node.producerNode.pop(); node.producerLastReadVersion.pop(); node.producerIndexOfThis.pop(); } } /** * Determine whether this consumer has any dependencies which have changed since the last time * they were read. */ export function consumerPollProducersForChange(node) { assertConsumerNode(node); // Poll producers for change. for (let i = 0; i < node.producerNode.length; i++) { const producer = node.producerNode[i]; const seenVersion = node.producerLastReadVersion[i]; // First check the versions. A mismatch means that the producer's value is known to have // changed since the last time we read it. if (seenVersion !== producer.version) { return true; } // The producer's version is the same as the last time we read it, but it might itself be // stale. Force the producer to recompute its version (calculating a new value if necessary). producerUpdateValueVersion(producer); // Now when we do this check, `producer.version` is guaranteed to be up to date, so if the // versions still match then it has not changed since the last time we read it. if (seenVersion !== producer.version) { return true; } } return false; } /** * Disconnect this consumer from the graph. */ export function consumerDestroy(node) { assertConsumerNode(node); if (consumerIsLive(node)) { // Drop all connections from the graph to this node. for (let i = 0; i < node.producerNode.length; i++) { producerRemoveLiveConsumerAtIndex(node.producerNode[i], node.producerIndexOfThis[i]); } } // Truncate all the arrays to drop all connection from this node to the graph. node.producerNode.length = node.producerLastReadVersion.length = node.producerIndexOfThis.length = 0; if (node.liveConsumerNode) { node.liveConsumerNode.length = node.liveConsumerIndexOfThis.length = 0; } } /** * Add `consumer` as a live consumer of this node. * * Note that this operation is potentially transitive. If this node becomes live, then it becomes * a live consumer of all of its current producers. */ function producerAddLiveConsumer(node, consumer, indexOfThis) { assertProducerNode(node); if (node.liveConsumerNode.length === 0 && isConsumerNode(node)) { // When going from 0 to 1 live consumers, we become a live consumer to our producers. for (let i = 0; i < node.producerNode.length; i++) { node.producerIndexOfThis[i] = producerAddLiveConsumer(node.producerNode[i], node, i); } } node.liveConsumerIndexOfThis.push(indexOfThis); return node.liveConsumerNode.push(consumer) - 1; } /** * Remove the live consumer at `idx`. */ function producerRemoveLiveConsumerAtIndex(node, idx) { assertProducerNode(node); if (typeof ngDevMode !== 'undefined' && ngDevMode && idx >= node.liveConsumerNode.length) { throw new Error(`Assertion error: active consumer index ${idx} is out of bounds of ${node.liveConsumerNode.length} consumers)`); } if (node.liveConsumerNode.length === 1 && isConsumerNode(node)) { // When removing the last live consumer, we will no longer be live. We need to remove // ourselves from our producers' tracking (which may cause consumer-producers to lose // liveness as well). for (let i = 0; i < node.producerNode.length; i++) { producerRemoveLiveConsumerAtIndex(node.producerNode[i], node.producerIndexOfThis[i]); } } // Move the last value of `liveConsumers` into `idx`. Note that if there's only a single // live consumer, this is a no-op. const lastIdx = node.liveConsumerNode.length - 1; node.liveConsumerNode[idx] = node.liveConsumerNode[lastIdx]; node.liveConsumerIndexOfThis[idx] = node.liveConsumerIndexOfThis[lastIdx]; // Truncate the array. node.liveConsumerNode.length--; node.liveConsumerIndexOfThis.length--; // If the index is still valid, then we need to fix the index pointer from the producer to this // consumer, and update it from `lastIdx` to `idx` (accounting for the move above). if (idx < node.liveConsumerNode.length) { const idxProducer = node.liveConsumerIndexOfThis[idx]; const consumer = node.liveConsumerNode[idx]; assertConsumerNode(consumer); consumer.producerIndexOfThis[idxProducer] = idx; } } function consumerIsLive(node) { return node.consumerIsAlwaysLive || (node?.liveConsumerNode?.length ?? 0) > 0; } function assertConsumerNode(node) { node.producerNode ??= []; node.producerIndexOfThis ??= []; node.producerLastReadVersion ??= []; } function assertProducerNode(node) { node.liveConsumerNode ??= []; node.liveConsumerIndexOfThis ??= []; } function isConsumerNode(node) { return node.producerNode !== undefined; } //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\n// Required as the signals library is in a separate package, so we need to explicitly ensure the\n// global `ngDevMode` type is defined.\ndeclare const ngDevMode: boolean | undefined;\n\n/**\n * The currently active consumer `ReactiveNode`, if running code in a reactive context.\n *\n * Change this via `setActiveConsumer`.\n */\nlet activeConsumer: ReactiveNode | null = null;\nlet inNotificationPhase = false;\n\ntype Version = number & {__brand: 'Version'};\n\n/**\n * Global epoch counter. Incremented whenever a source signal is set.\n */\nlet epoch: Version = 1 as Version;\n\n/**\n * Symbol used to tell `Signal`s apart from other functions.\n *\n * This can be used to auto-unwrap signals in various cases, or to auto-wrap non-signal values.\n */\nexport const SIGNAL = /* @__PURE__ */ Symbol('SIGNAL');\n\nexport function setActiveConsumer(consumer: ReactiveNode | null): ReactiveNode | null {\n  const prev = activeConsumer;\n  activeConsumer = consumer;\n  return prev;\n}\n\nexport function getActiveConsumer(): ReactiveNode | null {\n  return activeConsumer;\n}\n\nexport function isInNotificationPhase(): boolean {\n  return inNotificationPhase;\n}\n\nexport interface Reactive {\n  [SIGNAL]: ReactiveNode;\n}\n\nexport function isReactive(value: unknown): value is Reactive {\n  return (value as Partial<Reactive>)[SIGNAL] !== undefined;\n}\n\nexport const REACTIVE_NODE: ReactiveNode = {\n  version: 0 as Version,\n  lastCleanEpoch: 0 as Version,\n  dirty: false,\n  producerNode: undefined,\n  producerLastReadVersion: undefined,\n  producerIndexOfThis: undefined,\n  nextProducerIndex: 0,\n  liveConsumerNode: undefined,\n  liveConsumerIndexOfThis: undefined,\n  consumerAllowSignalWrites: false,\n  consumerIsAlwaysLive: false,\n  producerMustRecompute: () => false,\n  producerRecomputeValue: () => {},\n  consumerMarkedDirty: () => {},\n  consumerOnSignalRead: () => {},\n};\n\n/**\n * A producer and/or consumer which participates in the reactive graph.\n *\n * Producer `ReactiveNode`s which are accessed when a consumer `ReactiveNode` is the\n * `activeConsumer` are tracked as dependencies of that consumer.\n *\n * Certain consumers are also tracked as \"live\" consumers and create edges in the other direction,\n * from producer to consumer. These edges are used to propagate change notifications when a\n * producer's value is updated.\n *\n * A `ReactiveNode` may be both a producer and consumer.\n */\nexport interface ReactiveNode {\n  /**\n   * Version of the value that this node produces.\n   *\n   * This is incremented whenever a new value is produced by this node which is not equal to the\n   * previous value (by whatever definition of equality is in use).\n   */\n  version: Version;\n\n  /**\n   * Epoch at which this node is verified to be clean.\n   *\n   * This allows skipping of some polling operations in the case where no signals have been set\n   * since this node was last read.\n   */\n  lastCleanEpoch: Version;\n\n  /**\n   * Whether this node (in its consumer capacity) is dirty.\n   *\n   * Only live consumers become dirty, when receiving a change notification from a dependency\n   * producer.\n   */\n  dirty: boolean;\n\n  /**\n   * Producers which are dependencies of this consumer.\n   *\n   * Uses the same indices as the `producerLastReadVersion` and `producerIndexOfThis` arrays.\n   */\n  producerNode: ReactiveNode[] | undefined;\n\n  /**\n   * `Version` of the value last read by a given producer.\n   *\n   * Uses the same indices as the `producerNode` and `producerIndexOfThis` arrays.\n   */\n  producerLastReadVersion: Version[] | undefined;\n\n  /**\n   * Index of `this` (consumer) in each producer's `liveConsumers` array.\n   *\n   * This value is only meaningful if this node is live (`liveConsumers.length > 0`). Otherwise\n   * these indices are stale.\n   *\n   * Uses the same indices as the `producerNode` and `producerLastReadVersion` arrays.\n   */\n  producerIndexOfThis: number[] | undefined;\n\n  /**\n   * Index into the producer arrays that the next dependency of this node as a consumer will use.\n   *\n   * This index is zeroed before this node as a consumer begins executing. When a producer is read,\n   * it gets inserted into the producers arrays at this index. There may be an existing dependency\n   * in this location which may or may not match the incoming producer, depending on whether the\n   * same producers were read in the same order as the last computation.\n   */\n  nextProducerIndex: number;\n\n  /**\n   * Array of consumers of this producer that are \"live\" (they require push notifications).\n   *\n   * `liveConsumerNode.length` is effectively our reference count for this node.\n   */\n  liveConsumerNode: ReactiveNode[] | undefined;\n\n  /**\n   * Index of `this` (producer) in each consumer's `producerNode` array.\n   *\n   * Uses the same indices as the `liveConsumerNode` array.\n   */\n  liveConsumerIndexOfThis: number[] | undefined;\n\n  /**\n   * Whether writes to signals are allowed when this consumer is the `activeConsumer`.\n   *\n   * This is used to enforce guardrails such as preventing writes to writable signals in the\n   * computation function of computed signals, which is supposed to be pure.\n   */\n  consumerAllowSignalWrites: boolean;\n\n  readonly consumerIsAlwaysLive: boolean;\n\n  /**\n   * Tracks whether producers need to recompute their value independently of the reactive graph (for\n   * example, if no initial value has been computed).\n   */\n  producerMustRecompute(node: unknown): boolean;\n  producerRecomputeValue(node: unknown): void;\n  consumerMarkedDirty(node: unknown): void;\n\n  /**\n   * Called when a signal is read within this consumer.\n   */\n  consumerOnSignalRead(node: unknown): void;\n}\n\ninterface ConsumerNode extends ReactiveNode {\n  producerNode: NonNullable<ReactiveNode['producerNode']>;\n  producerIndexOfThis: NonNullable<ReactiveNode['producerIndexOfThis']>;\n  producerLastReadVersion: NonNullable<ReactiveNode['producerLastReadVersion']>;\n}\n\ninterface ProducerNode extends ReactiveNode {\n  liveConsumerNode: NonNullable<ReactiveNode['liveConsumerNode']>;\n  liveConsumerIndexOfThis: NonNullable<ReactiveNode['liveConsumerIndexOfThis']>;\n}\n\n/**\n * Called by implementations when a producer's signal is read.\n */\nexport function producerAccessed(node: ReactiveNode): void {\n  if (inNotificationPhase) {\n    throw new Error(\n      typeof ngDevMode !== 'undefined' && ngDevMode\n        ? `Assertion error: signal read during notification phase`\n        : '',\n    );\n  }\n\n  if (activeConsumer === null) {\n    // Accessed outside of a reactive context, so nothing to record.\n    return;\n  }\n\n  activeConsumer.consumerOnSignalRead(node);\n\n  // This producer is the `idx`th dependency of `activeConsumer`.\n  const idx = activeConsumer.nextProducerIndex++;\n\n  assertConsumerNode(activeConsumer);\n\n  if (idx < activeConsumer.producerNode.length && activeConsumer.producerNode[idx] !== node) {\n    // There's been a change in producers since the last execution of `activeConsumer`.\n    // `activeConsumer.producerNode[idx]` holds a stale dependency which will be be removed and\n    // replaced with `this`.\n    //\n    // If `activeConsumer` isn't live, then this is a no-op, since we can replace the producer in\n    // `activeConsumer.producerNode` directly. However, if `activeConsumer` is live, then we need\n    // to remove it from the stale producer's `liveConsumer`s.\n    if (consumerIsLive(activeConsumer)) {\n      const staleProducer = activeConsumer.producerNode[idx];\n      producerRemoveLiveConsumerAtIndex(staleProducer, activeConsumer.producerIndexOfThis[idx]);\n\n      // At this point, the only record of `staleProducer` is the reference at\n      // `activeConsumer.producerNode[idx]` which will be overwritten below.\n    }\n  }\n\n  if (activeConsumer.producerNode[idx] !== node) {\n    // We're a new dependency of the consumer (at `idx`).\n    activeConsumer.producerNode[idx] = node;\n\n    // If the active consumer is live, then add it as a live consumer. If not, then use 0 as a\n    // placeholder value.\n    activeConsumer.producerIndexOfThis[idx] = consumerIsLive(activeConsumer)\n      ? producerAddLiveConsumer(node, activeConsumer, idx)\n      : 0;\n  }\n  activeConsumer.producerLastReadVersion[idx] = node.version;\n}\n\n/**\n * Increment the global epoch counter.\n *\n * Called by source producers (that is, not computeds) whenever their values change.\n */\nexport function producerIncrementEpoch(): void {\n  epoch++;\n}\n\n/**\n * Ensure this producer's `version` is up-to-date.\n */\nexport function producerUpdateValueVersion(node: ReactiveNode): void {\n  if (consumerIsLive(node) && !node.dirty) {\n    // A live consumer will be marked dirty by producers, so a clean state means that its version\n    // is guaranteed to be up-to-date.\n    return;\n  }\n\n  if (!node.dirty && node.lastCleanEpoch === epoch) {\n    // Even non-live consumers can skip polling if they previously found themselves to be clean at\n    // the current epoch, since their dependencies could not possibly have changed (such a change\n    // would've increased the epoch).\n    return;\n  }\n\n  if (!node.producerMustRecompute(node) && !consumerPollProducersForChange(node)) {\n    // None of our producers report a change since the last time they were read, so no\n    // recomputation of our value is necessary, and we can consider ourselves clean.\n    node.dirty = false;\n    node.lastCleanEpoch = epoch;\n    return;\n  }\n\n  node.producerRecomputeValue(node);\n\n  // After recomputing the value, we're no longer dirty.\n  node.dirty = false;\n  node.lastCleanEpoch = epoch;\n}\n\n/**\n * Propagate a dirty notification to live consumers of this producer.\n */\nexport function producerNotifyConsumers(node: ReactiveNode): void {\n  if (node.liveConsumerNode === undefined) {\n    return;\n  }\n\n  // Prevent signal reads when we're updating the graph\n  const prev = inNotificationPhase;\n  inNotificationPhase = true;\n  try {\n    for (const consumer of node.liveConsumerNode) {\n      if (!consumer.dirty) {\n        consumerMarkDirty(consumer);\n      }\n    }\n  } finally {\n    inNotificationPhase = prev;\n  }\n}\n\n/**\n * Whether this `ReactiveNode` in its producer capacity is currently allowed to initiate updates,\n * based on the current consumer context.\n */\nexport function producerUpdatesAllowed(): boolean {\n  return activeConsumer?.consumerAllowSignalWrites !== false;\n}\n\nexport function consumerMarkDirty(node: ReactiveNode): void {\n  node.dirty = true;\n  producerNotifyConsumers(node);\n  node.consumerMarkedDirty?.(node);\n}\n\n/**\n * Prepare this consumer to run a computation in its reactive context.\n *\n * Must be called by subclasses which represent reactive computations, before those computations\n * begin.\n */\nexport function consumerBeforeComputation(node: ReactiveNode | null): ReactiveNode | null {\n  node && (node.nextProducerIndex = 0);\n  return setActiveConsumer(node);\n}\n\n/**\n * Finalize this consumer's state after a reactive computation has run.\n *\n * Must be called by subclasses which represent reactive computations, after those computations\n * have finished.\n */\nexport function consumerAfterComputation(\n  node: ReactiveNode | null,\n  prevConsumer: ReactiveNode | null,\n): void {\n  setActiveConsumer(prevConsumer);\n\n  if (\n    !node ||\n    node.producerNode === undefined ||\n    node.producerIndexOfThis === undefined ||\n    node.producerLastReadVersion === undefined\n  ) {\n    return;\n  }\n\n  if (consumerIsLive(node)) {\n    // For live consumers, we need to remove the producer -> consumer edge for any stale producers\n    // which weren't dependencies after the recomputation.\n    for (let i = node.nextProducerIndex; i < node.producerNode.length; i++) {\n      producerRemoveLiveConsumerAtIndex(node.producerNode[i], node.producerIndexOfThis[i]);\n    }\n  }\n\n  // Truncate the producer tracking arrays.\n  // Perf note: this is essentially truncating the length to `node.nextProducerIndex`, but\n  // benchmarking has shown that individual pop operations are faster.\n  while (node.producerNode.length > node.nextProducerIndex) {\n    node.producerNode.pop();\n    node.producerLastReadVersion.pop();\n    node.producerIndexOfThis.pop();\n  }\n}\n\n/**\n * Determine whether this consumer has any dependencies which have changed since the last time\n * they were read.\n */\nexport function consumerPollProducersForChange(node: ReactiveNode): boolean {\n  assertConsumerNode(node);\n\n  // Poll producers for change.\n  for (let i = 0; i < node.producerNode.length; i++) {\n    const producer = node.producerNode[i];\n    const seenVersion = node.producerLastReadVersion[i];\n\n    // First check the versions. A mismatch means that the producer's value is known to have\n    // changed since the last time we read it.\n    if (seenVersion !== producer.version) {\n      return true;\n    }\n\n    // The producer's version is the same as the last time we read it, but it might itself be\n    // stale. Force the producer to recompute its version (calculating a new value if necessary).\n    producerUpdateValueVersion(producer);\n\n    // Now when we do this check, `producer.version` is guaranteed to be up to date, so if the\n    // versions still match then it has not changed since the last time we read it.\n    if (seenVersion !== producer.version) {\n      return true;\n    }\n  }\n\n  return false;\n}\n\n/**\n * Disconnect this consumer from the graph.\n */\nexport function consumerDestroy(node: ReactiveNode): void {\n  assertConsumerNode(node);\n  if (consumerIsLive(node)) {\n    // Drop all connections from the graph to this node.\n    for (let i = 0; i < node.producerNode.length; i++) {\n      producerRemoveLiveConsumerAtIndex(node.producerNode[i], node.producerIndexOfThis[i]);\n    }\n  }\n\n  // Truncate all the arrays to drop all connection from this node to the graph.\n  node.producerNode.length =\n    node.producerLastReadVersion.length =\n    node.producerIndexOfThis.length =\n      0;\n  if (node.liveConsumerNode) {\n    node.liveConsumerNode.length = node.liveConsumerIndexOfThis!.length = 0;\n  }\n}\n\n/**\n * Add `consumer` as a live consumer of this node.\n *\n * Note that this operation is potentially transitive. If this node becomes live, then it becomes\n * a live consumer of all of its current producers.\n */\nfunction producerAddLiveConsumer(\n  node: ReactiveNode,\n  consumer: ReactiveNode,\n  indexOfThis: number,\n): number {\n  assertProducerNode(node);\n  if (node.liveConsumerNode.length === 0 && isConsumerNode(node)) {\n    // When going from 0 to 1 live consumers, we become a live consumer to our producers.\n    for (let i = 0; i < node.producerNode.length; i++) {\n      node.producerIndexOfThis[i] = producerAddLiveConsumer(node.producerNode[i], node, i);\n    }\n  }\n  node.liveConsumerIndexOfThis.push(indexOfThis);\n  return node.liveConsumerNode.push(consumer) - 1;\n}\n\n/**\n * Remove the live consumer at `idx`.\n */\nfunction producerRemoveLiveConsumerAtIndex(node: ReactiveNode, idx: number): void {\n  assertProducerNode(node);\n\n  if (typeof ngDevMode !== 'undefined' && ngDevMode && idx >= node.liveConsumerNode.length) {\n    throw new Error(\n      `Assertion error: active consumer index ${idx} is out of bounds of ${node.liveConsumerNode.length} consumers)`,\n    );\n  }\n\n  if (node.liveConsumerNode.length === 1 && isConsumerNode(node)) {\n    // When removing the last live consumer, we will no longer be live. We need to remove\n    // ourselves from our producers' tracking (which may cause consumer-producers to lose\n    // liveness as well).\n    for (let i = 0; i < node.producerNode.length; i++) {\n      producerRemoveLiveConsumerAtIndex(node.producerNode[i], node.producerIndexOfThis[i]);\n    }\n  }\n\n  // Move the last value of `liveConsumers` into `idx`. Note that if there's only a single\n  // live consumer, this is a no-op.\n  const lastIdx = node.liveConsumerNode.length - 1;\n  node.liveConsumerNode[idx] = node.liveConsumerNode[lastIdx];\n  node.liveConsumerIndexOfThis[idx] = node.liveConsumerIndexOfThis[lastIdx];\n\n  // Truncate the array.\n  node.liveConsumerNode.length--;\n  node.liveConsumerIndexOfThis.length--;\n\n  // If the index is still valid, then we need to fix the index pointer from the producer to this\n  // consumer, and update it from `lastIdx` to `idx` (accounting for the move above).\n  if (idx < node.liveConsumerNode.length) {\n    const idxProducer = node.liveConsumerIndexOfThis[idx];\n    const consumer = node.liveConsumerNode[idx];\n    assertConsumerNode(consumer);\n    consumer.producerIndexOfThis[idxProducer] = idx;\n  }\n}\n\nfunction consumerIsLive(node: ReactiveNode): boolean {\n  return node.consumerIsAlwaysLive || (node?.liveConsumerNode?.length ?? 0) > 0;\n}\n\nfunction assertConsumerNode(node: ReactiveNode): asserts node is ConsumerNode {\n  node.producerNode ??= [];\n  node.producerIndexOfThis ??= [];\n  node.producerLastReadVersion ??= [];\n}\n\nfunction assertProducerNode(node: ReactiveNode): asserts node is ProducerNode {\n  node.liveConsumerNode ??= [];\n  node.liveConsumerIndexOfThis ??= [];\n}\n\nfunction isConsumerNode(node: ReactiveNode): node is ConsumerNode {\n  return node.producerNode !== undefined;\n}\n"]}