@angular/core
Version:
Angular - the core framework
318 lines • 46.9 kB
JavaScript
/**
* @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"]}