@tanstack/db
Version:
A reactive client store for building super fast apps on sync
900 lines (899 loc) • 28.9 kB
JavaScript
import { D2, output } from "@tanstack/db-ivm";
import { compileQuery } from "../compiler/index.js";
import { SetWindowRequiresOrderByError, SetWindowReentrancyError, LoadSubsetOperationAbortedError, MissingAliasInputsError } from "../../errors.js";
import { withPublicationContext } from "../../scheduler.js";
import { createDeferred } from "../../deferred.js";
import { deepEquals } from "../../utils.js";
import { runAllCallbacks } from "../../utils/callbacks.js";
import { normalizeError } from "../../utils/error.js";
import { createSourceRecord } from "../../utils/source-record.js";
import { CollectionSubscriber } from "./collection-subscriber.js";
import { getCollectionBuilder } from "./collection-registry.js";
import { LIVE_QUERY_INTERNAL } from "./internal.js";
import { materializeCompilation } from "./materialized-pipeline.js";
import { BucketFacadeAdapter } from "./bucket-facade-adapter.js";
import { scheduleQueryGraphRun } from "./graph-scheduler.js";
import { hasPendingJoinedWork } from "./subset-demand-controller.js";
import { buildQueryFromConfig, extractCollectionsFromQuery, extractCollectionFromSource } from "./utils.js";
import { collectCollectionSources } from "../ir.js";
let liveQueryCollectionCounter = 0;
class CollectionConfigBuilder {
constructor(config) {
this.config = config;
this.fz = /* @__PURE__ */ new WeakMap();
this.cN = /* @__PURE__ */ new WeakMap();
this.br = false;
this.bq = 0;
this.b6 = false;
this.cv = false;
this.cc = /* @__PURE__ */ new Set();
this.bh = /* @__PURE__ */ new Set();
this.subscriptions = createSourceRecord();
this.lazySourcesCallbacks = createSourceRecord();
this.lazySources = /* @__PURE__ */ new Set();
this.aQ = /* @__PURE__ */ new Map();
this.fp = 0;
this.aG = /* @__PURE__ */ new Set();
this.ba = false;
this.dq = false;
this.syncRunGeneration = 0;
this.windowOperationGeneration = 0;
this.optimizableOrderByCollections = createSourceRecord();
this.id = config.id || `live-query-${++liveQueryCollectionCounter}`;
this.query = buildQueryFromConfig({
query: config.query,
requireObjectResult: true
});
this.cV = this.query.orderBy?.length ? {
offset: this.query.offset ?? 0,
limit: this.query.limit ?? Infinity
} : void 0;
this.bD = this.cV;
this.collections = extractCollectionsFromQuery(this.query);
this.ai = collectCollectionSources(this.query);
if (this.query.orderBy && this.query.orderBy.length > 0) {
this.compare = createOrderByComparator(this.cN);
}
this.queryCompareOptions = extractCollectionFromSource(
this.query
).compareOptions;
this.compareOptions = this.config.defaultStringCollation ?? this.queryCompareOptions;
this.ef();
}
/** Direct lexical source Collections, including joins, unions, and includes. */
getSourceCollections() {
return this.ai.map(({ collection }) => collection);
}
/**
* Recursively checks if a query or any of its subqueries contains joins
*/
hasJoins(query) {
if (query.join && query.join.length > 0) {
return true;
}
if (query.from.type === `queryRef`) {
if (this.hasJoins(query.from.query)) {
return true;
}
} else if (query.from.type === `unionFrom`) {
for (const source of query.from.sources) {
if (source.type === `queryRef` && this.hasJoins(source.query)) {
return true;
}
}
} else if (query.from.type === `unionAll`) {
for (const branch of query.from.queries) {
if (this.hasJoins(branch)) {
return true;
}
}
}
return false;
}
getConfig() {
const builder = this;
return {
id: this.id,
getKey: this.config.getKey || ((item) => this.fz.get(item) ?? item.$key),
sync: this.fE(),
compare: this.compare,
defaultStringCollation: this.compareOptions,
gcTime: this.config.gcTime ?? 5e3,
// 5 seconds by default for live queries
schema: this.config.schema,
onInsert: this.config.onInsert,
onUpdate: this.config.onUpdate,
onDelete: this.config.onDelete,
startSync: this.config.startSync,
singleResult: this.query.singleResult,
utils: {
get lastSubsetError() {
return builder.lastSubsetError;
},
setWindow: this.setWindow.bind(this),
getWindow: this.getWindow.bind(this),
[LIVE_QUERY_INTERNAL]: {
getBuilder: () => this,
hasCustomGetKey: !!this.config.getKey,
hasJoins: this.hasJoins(this.query),
hasDistinct: !!this.query.distinct
}
}
};
}
setWindow(options) {
const windowFn = this.f$;
if (!windowFn) {
throw new SetWindowRequiresOrderByError();
}
if (this.ag || this.br || Object.values(this.optimizableOrderByCollections).some(
(info) => info.isRequesting?.()
)) {
throw new SetWindowReentrancyError();
}
const baseWindow = this.L ?? this.bD ?? this.cV;
const requestedWindow = {
offset: options.offset ?? baseWindow?.offset,
limit: options.limit ?? baseWindow?.limit
};
const sourceRecovery = this.eV();
if (sourceRecovery) {
return sourceRecovery.then(async () => {
const settlement2 = this.setWindow(requestedWindow);
if (settlement2 !== true) await settlement2;
});
}
if (this.eF()) {
return Promise.reject(
this.lastSubsetError ?? new Error(`Source recovery failed`)
);
}
const windowOperationGeneration = ++this.windowOperationGeneration;
const loadOperation = this.liveQueryCollection?._sync.beginLoadSubsetOperation();
for (const info of Object.values(this.optimizableOrderByCollections)) {
if (!info.joinedFilterSourceId) continue;
for (const plan of this.lazySourcesCallbacks[info.joinedFilterSourceId]?.plans ?? []) {
const participant = this.aQ.get(plan.id)?.participant;
if (participant?.isPending()) {
this.trackSubsetLoadOperationPromise(participant.promise);
}
}
}
const previousOperation = this.ag;
const operation = { generation: windowOperationGeneration, failed: false };
this.ag = operation;
this.dq = false;
if (this.aG.size === 0) this.ba = false;
try {
this.L = requestedWindow;
withPublicationContext(() => {
windowFn(requestedWindow);
this.bx?.();
});
if (operation.failed) throw operation.error;
} catch (error) {
if (windowOperationGeneration === this.windowOperationGeneration) {
this.dq = true;
this.L = this.bD;
}
loadOperation?.cancel();
throw error;
} finally {
this.ag = previousOperation;
}
const settlement = loadOperation?.wait() ?? true;
if (settlement === true) {
this.bD = requestedWindow;
return true;
}
return settlement.then(
() => {
if (windowOperationGeneration === this.windowOperationGeneration) {
this.bD = requestedWindow;
}
},
(error) => {
if (windowOperationGeneration === this.windowOperationGeneration) {
this.dq = true;
this.L = this.bD;
}
throw error;
}
);
}
getWindow() {
const window = this.bD ?? this.cV;
if (!this.f$ || !window) {
return void 0;
}
return {
offset: window.offset ?? 0,
limit: window.limit ?? 0
};
}
isLazySource(sourceId) {
return this.lazySources.has(sourceId);
}
beginDemand(planId, pending = false) {
const generation = ++this.fp;
const previous = this.aQ.get(planId);
const participant = pending ? createDeferred() : void 0;
if (participant) {
void participant.promise.catch(() => {
});
this.trackSubsetLoadOperationPromise(participant.promise);
}
this.aQ.set(planId, {
generation,
settled: false,
participant
});
previous?.participant?.resolve();
return generation;
}
settleDemand(planId, generation) {
const demand = this.aQ.get(planId);
if (!demand || demand.generation !== generation || demand.settled) return;
demand.settled = true;
try {
this.bx?.();
demand.participant?.resolve();
} catch (error) {
demand.participant?.reject(error);
throw error;
}
}
hasPendingJoinedWork(joinedSourceId) {
return hasPendingJoinedWork(
joinedSourceId,
this.lazySourcesCallbacks,
this.subscriptions,
(planId) => this.aQ.get(planId)?.settled === false
);
}
failDemand(planId, generation, error) {
const demand = this.aQ.get(planId);
if (!demand || demand.generation !== generation) return;
const normalized = this.recordSubsetError(error);
demand.participant?.reject(normalized);
this.cI(
`Subset demand '${planId}' failed: ${normalized.message}`,
normalized
);
}
recordSubsetError(error, fatalBeforeReady = false) {
const normalized = normalizeError(error);
this.lastSubsetError = normalized;
if (this.ag) {
this.ag.failed = true;
this.ag.error = normalized;
this.ba = true;
}
if (fatalBeforeReady) {
this.cI(
`Initial subset load failed: ${normalized.message}`,
normalized
);
}
return normalized;
}
trackSubsetLoadPromise(promise) {
this.liveQueryCollection._sync.trackLoadPromise(promise);
}
trackSubsetLoadOperationPromise(promise) {
this.liveQueryCollection._sync.trackLoadSubsetOperationPromise(promise);
}
hasActiveWindowOperation() {
return this.ag !== void 0;
}
getActiveWindowOperationGeneration() {
return this.ag?.generation;
}
scheduleGraphRunIfSyncRunCurrent(syncRunGeneration) {
if (syncRunGeneration !== this.syncRunGeneration || !this.currentSyncConfig || !this.currentSyncState) {
return;
}
this.scheduleGraphRun();
}
trackOrderedLoadPromise(promise, holdPublication = false) {
if (!holdPublication && !this.ag && this.liveQueryCollection?.status !== `loading` && this.aG.size === 0) {
return;
}
const syncRunGeneration = this.syncRunGeneration;
if (this.aG.size === 0) this.ba = false;
this.aG.add(promise);
const finish = (succeeded) => {
if (syncRunGeneration !== this.syncRunGeneration || !this.aG.delete(promise)) {
return;
}
if (!succeeded) this.ba = true;
if (!this.ba && this.aG.size === 0) {
this.scheduleGraphRun();
}
};
void promise.then(
() => finish(true),
() => finish(false)
);
}
retireDemand(planId) {
const demand = this.aQ.get(planId);
this.aQ.delete(planId);
demand?.participant?.resolve();
}
hasPendingSourceRecovery() {
return Object.values(this.subscriptions).some(
(subscription) => subscription.hasPendingTruncateReplacement
);
}
eV() {
const pending = Object.values(this.subscriptions).flatMap(
(subscription) => subscription.pendingTruncateReplacement ? [subscription.pendingTruncateReplacement] : []
);
return pending.length > 0 ? Promise.all(pending).then(() => void 0) : void 0;
}
eF() {
return Object.values(this.subscriptions).some(
(subscription) => subscription.hasFailedTruncateReplacement
);
}
getSyncRunGeneration() {
return this.syncRunGeneration;
}
advanceGraphInputRevision() {
this.bq++;
}
getGraphInputRevision() {
return this.bq;
}
// Every graph turn checks ordered demand after D2 reaches a checkpoint.
// The source loader owns the fixed-point latches that prevent repeat requests.
maybeRunGraph() {
if (this.br) {
return;
}
if (!this.currentSyncConfig || !this.currentSyncState) {
throw new Error(
`maybeRunGraph called without active sync run. This should not happen.`
);
}
this.br = true;
try {
const syncRunGeneration = this.syncRunGeneration;
const config = this.currentSyncConfig;
const { begin, commit } = config;
const syncState = this.currentSyncState;
const isCurrentSyncRun = () => syncRunGeneration === this.syncRunGeneration && this.currentSyncConfig === config && this.currentSyncState === syncState;
if (this.b6) {
return;
}
if (syncState.subscribedToAllCollections) {
let checkedLoaders = false;
while (syncState.graph.pendingWork() || !checkedLoaders) {
if (syncState.graph.pendingWork()) {
try {
syncState.graph.run();
} catch (error) {
if (isCurrentSyncRun()) {
this.cI(`Live query graph failed`, error);
}
throw error;
}
if (!isCurrentSyncRun()) return;
}
this.e_?.();
if (!isCurrentSyncRun()) return;
checkedLoaders = true;
}
syncState.flushPendingChanges?.();
if (!isCurrentSyncRun()) return;
if (syncState.messagesCount === 0) {
begin();
commit();
}
this.bS(config);
}
} finally {
this.br = false;
}
}
/**
* Schedules a graph run with the transaction-scoped scheduler.
* Ensures each builder runs at most once per transaction, with automatic dependency tracking
* to run parent queries before child queries. Outside a transaction, runs immediately.
*
* Multiple calls during a transaction are coalesced into a single execution.
* Dependencies are discovered from subscribed live queries.
*
* Uses the current sync run's config and syncState from instance properties.
*
* @param options - Optional scheduling configuration
* @param options.contextId - Transaction ID to group work; defaults to active transaction
*/
scheduleGraphRun(options) {
if (!this.currentSyncConfig || !this.currentSyncState) {
throw new Error(
`scheduleGraphRun called without active sync run. This should not happen.`
);
}
const syncRunGeneration = this.syncRunGeneration;
scheduleQueryGraphRun(
this,
this.bh,
() => {
if (syncRunGeneration === this.syncRunGeneration && this.currentSyncConfig && this.currentSyncState) {
this.maybeRunGraph();
}
},
options?.contextId
);
}
fE() {
return {
rowUpdateMode: `full`,
sync: this.fP.bind(this)
};
}
fP(config) {
const syncRunGeneration = ++this.syncRunGeneration;
this.liveQueryCollection = config.collection;
this.b6 = false;
this.cv = false;
this.cc.clear();
this.lastSubsetError = void 0;
this.currentSyncConfig = config;
const syncState = {
messagesCount: 0,
subscribedToAllCollections: false,
unsubscribeCallbacks: /* @__PURE__ */ new Set()
};
let tornDown = false;
const teardown = () => {
if (tornDown) return;
tornDown = true;
if (this.syncRunGeneration === syncRunGeneration) {
this.syncRunGeneration++;
}
try {
runAllCallbacks(syncState.unsubscribeCallbacks);
} finally {
syncState.unsubscribeCallbacks.clear();
this.fl();
}
};
try {
const fullSyncState = this.dC(
config,
syncState
);
this.currentSyncState = fullSyncState;
const loadingSubsetUnsubscribe = config.collection.on(
`loadingSubset:change`,
(event) => {
if (!event.isLoadingSubset) {
this.bS(config);
if (this.hasPendingSourceRecovery()) this.bx?.();
}
}
);
syncState.unsubscribeCallbacks.add(loadingSubsetUnsubscribe);
this.e_ = this.ev(config, fullSyncState);
this.bx = () => this.scheduleGraphRun();
this.scheduleGraphRun();
} catch (error) {
try {
teardown();
} catch {
}
throw error;
}
return teardown;
}
fl() {
this.windowOperationGeneration++;
this.currentSyncConfig = void 0;
this.currentSyncState = void 0;
this.bx = void 0;
this.e_ = void 0;
this.L = void 0;
this.bD = this.cV;
this.b6 = false;
this.cv = false;
this.cc.clear();
this.d3 = void 0;
this.cY = void 0;
this.dL = void 0;
this.sourceWhereClausesCache = void 0;
this.dg = void 0;
this.lazySources.clear();
for (const demand of this.aQ.values()) {
demand.participant?.reject(new LoadSubsetOperationAbortedError());
}
this.aQ.clear();
this.aG.clear();
this.ba = false;
this.dq = false;
this.optimizableOrderByCollections = createSourceRecord();
this.lazySourcesCallbacks = createSourceRecord();
Object.keys(this.subscriptions).forEach(
(key) => delete this.subscriptions[key]
);
}
/**
* Compiles the query pipeline with all declared aliases.
*/
ef() {
this.d3 = new D2();
const inputs = createSourceRecord();
for (const source of this.ai) {
inputs[source.sourceId] = this.d3.newInput();
}
this.cY = inputs;
const compilation = compileQuery(
this.query,
this.cY,
this.collections,
this.subscriptions,
this.lazySourcesCallbacks,
this.lazySources,
this.optimizableOrderByCollections,
(windowFn) => {
this.f$ = windowFn;
if (this.L) {
windowFn(this.L);
}
}
);
const materialized = materializeCompilation(
compilation,
this.config.getKey,
this.hasJoins(this.query)
);
this.dL = materialized.pipeline;
this.sourceWhereClausesCache = compilation.sourceWhereClauses;
this.dg = materialized.facades;
const missingSources = this.ai.map((source) => source.sourceId).filter((sourceId) => !Object.hasOwn(this.cY, sourceId));
if (missingSources.length > 0) {
throw new MissingAliasInputsError(missingSources);
}
}
eA() {
if (!this.d3 || !this.cY || !this.dL) {
this.ef();
}
return {
graph: this.d3,
inputs: this.cY,
pipeline: this.dL
};
}
dC(config, syncState) {
const { begin, commit } = config;
const { graph, inputs, pipeline } = this.eA();
let pendingChanges = /* @__PURE__ */ new Map();
pipeline.pipe(
output((data) => {
const messages = data.getInner();
syncState.messagesCount += messages.length;
messages.reduce(accumulateChanges, pendingChanges);
})
);
const facadeCompilations = this.dg;
const bucketFacades = facadeCompilations ? new BucketFacadeAdapter(this.id, facadeCompilations, (count) => {
syncState.messagesCount += count;
}) : void 0;
if (bucketFacades) {
syncState.unsubscribeCallbacks.add(() => bucketFacades.cleanup());
}
syncState.flushPendingChanges = () => {
const hasParentChanges = pendingChanges.size > 0;
const hasChildChanges = bucketFacades?.hasPendingChanges() ?? false;
if (!hasParentChanges && !hasChildChanges) {
return;
}
if (this.dq || this.ba || this.hasPendingSourceRecovery() || this.aG.size > 0 || Object.values(this.optimizableOrderByCollections).some(
(info) => info.joinedFilterSourceId !== void 0 && this.hasPendingJoinedWork(info.joinedFilterSourceId)
)) {
return;
}
for (const [key, { inserts, deletes }] of pendingChanges) {
if (Math.abs(inserts - deletes) > 1) {
throw new Error(
`Live query result key ${String(key)} changed by ${inserts - deletes} rows in one flush; a key has at most one result row.`
);
}
}
let facadePublication;
let rootPublication;
try {
facadePublication = bucketFacades?.flush();
rootPublication = hasParentChanges ? config.collection._deferPublication() : void 0;
const changesToApply = bucketFacades ? new Map(
[...pendingChanges].map(([key, changes]) => {
const resolved = {
...changes,
value: bucketFacades.resolve(changes.value)
};
if (changes.previousValue !== void 0) {
resolved.previousValue = bucketFacades.resolve(
changes.previousValue
);
}
return [key, resolved];
})
) : pendingChanges;
facadePublication?.prepare();
if (hasParentChanges) {
begin();
let lookup;
const hasSyncedKey = (key) => {
lookup ??= config.collection._state.createSyncedKeyLookup();
return lookup(key);
};
changesToApply.forEach(
this.fG.bind(this, config, hasSyncedKey)
);
if (hasOrderOnlyMove(changesToApply)) {
markLayoutChange(config.collection);
}
commit();
}
} catch (error) {
rootPublication?.discard();
facadePublication?.rollback();
throw error;
}
pendingChanges = /* @__PURE__ */ new Map();
let publicationError;
for (const publish of [
rootPublication?.publish,
facadePublication?.publish
]) {
if (!publish) continue;
try {
publish();
} catch (error) {
publicationError ??= error;
}
}
if (publicationError !== void 0) throw publicationError;
};
graph.finalize();
syncState.graph = graph;
syncState.inputs = inputs;
syncState.pipeline = pipeline;
return syncState;
}
fG(config, hasSyncedKey, changes, key) {
const { write, collection } = config;
const { deletes, inserts, value, orderByIndex } = changes;
this.fz.set(value, key);
if (orderByIndex !== void 0) {
this.cN.set(value, orderByIndex);
}
if (inserts && deletes === 0) {
write({
value,
type: `insert`
});
} else if (
// Insert & update(s) (updates are a delete & insert)
inserts > deletes || // A balanced delta updates an existing authoritative row, even if an
// optimistic delete hides it or its earlier insert is still queued.
inserts === deletes && hasSyncedKey(collection.getKeyFromItem(value))
) {
write({
value,
type: `update`
});
} else if (deletes > 0) {
write({
value,
type: `delete`
});
} else {
throw new Error(
`Could not apply changes: ${JSON.stringify(changes)}. This should never happen.`
);
}
}
/**
* Handle status changes from source collections
*/
dj(config, sourceId, collectionId, event) {
const { status } = event;
if (status === `error`) {
this.cc.add(sourceId);
this.e8(
`Source collection '${collectionId}' entered error state`
);
return;
}
if (status === `cleaned-up`) {
this.di(collectionId);
return;
}
if (status === `ready`) {
const recovered = this.cc.delete(sourceId);
if (recovered && !this.cv && this.cc.size === 0) {
this.b6 = false;
this.bx?.();
}
if (Object.values(this.optimizableOrderByCollections).some(
(info) => info.joinedFilterSourceId === sourceId
)) {
this.bx?.();
}
}
this.bS(config);
}
di(collectionId) {
if (this.cv) return;
const error = new Error(
`Source collection '${collectionId}' was manually cleaned up while live query '${this.id}' depends on it. Live queries prevent automatic GC, so this was likely a manual cleanup() call.`
);
this.cI(error.message, error);
return error;
}
/**
* Update the live query status based on source collection statuses
*/
bS(config) {
const { markReady } = config;
if (this.b6) {
return;
}
const subscribedToAll = this.currentSyncState?.subscribedToAllCollections;
const allReady = this.eD();
const allDemandsSettled = [...this.aQ.values()].every(
(demand) => demand.settled
);
const isLoading = this.liveQueryCollection?.isLoadingSubset;
if (subscribedToAll && allReady && allDemandsSettled && !isLoading) {
markReady();
}
}
/**
* Transition the live query to error state
*/
cI(message, error) {
this.cv = true;
this.e8(message, error);
}
e8(message, error) {
this.b6 = true;
console.error(`[Live Query Error] ${message}`);
this.liveQueryCollection?._lifecycle.markError(error ?? new Error(message));
}
eD() {
return this.ai.every(
(source) => (
// Only on-demand sources settle through route demand. Eager
// loadSubset calls return immediately, so they must reach ready.
this.lazySources.has(source.sourceId) && source.collection.config.syncMode === `on-demand` || source.collection.isReady()
)
);
}
/**
* Creates one subscription per lexical collection source.
* Each source gets independent filters, even when aliases or collections repeat.
* Example: `{ employee: col, manager: col }` creates two separate subscriptions.
*/
ev(config, syncState) {
if (this.ai.length === 0) {
throw new Error(
`Query '${this.id}' has no collection sources. This should not happen; please report.`
);
}
const loaders = this.ai.map((source) => {
const { sourceId, alias, collection } = source;
const collectionId = collection.id;
const dependencyBuilder = getCollectionBuilder(collection);
if (dependencyBuilder && dependencyBuilder !== this) {
this.bh.add(dependencyBuilder);
}
const collectionSubscriber = new CollectionSubscriber(
sourceId,
alias,
collection,
this
);
const statusUnsubscribe = collection.on(`status:change`, (event) => {
this.dj(config, sourceId, collectionId, event);
});
let cleanupStartError;
const cleanupStartUnsubscribe = collection._onCleanupStart(() => {
cleanupStartError = this.di(collectionId);
});
if (cleanupStartError) {
cleanupStartUnsubscribe();
statusUnsubscribe();
throw cleanupStartError;
}
syncState.unsubscribeCallbacks.add(statusUnsubscribe);
syncState.unsubscribeCallbacks.add(cleanupStartUnsubscribe);
if (collection.status === `error`) {
this.dj(config, sourceId, collectionId, {
type: `status:change`,
collection,
status: `error`,
previousStatus: `error`
});
}
const subscription = collectionSubscriber.subscribe();
this.subscriptions[sourceId] = subscription;
const lazyCallbacks = this.lazySourcesCallbacks[sourceId];
if (lazyCallbacks) {
lazyCallbacks.setDemand = (plan, keys) => collectionSubscriber.setDemand(subscription, plan, keys);
for (const plan of lazyCallbacks.plans ?? []) {
if (plan.initialKeys.size > 0) {
lazyCallbacks.setDemand(plan, plan.initialKeys);
}
}
}
const loadMore = collectionSubscriber.loadMoreIfNeeded.bind(
collectionSubscriber,
subscription
);
return loadMore;
});
syncState.subscribedToAllCollections = true;
return () => runAllCallbacks(loaders);
}
}
function createOrderByComparator(orderByIndices) {
return (val1, val2) => {
const index1 = orderByIndices.get(val1);
const index2 = orderByIndices.get(val2);
if (index1 && index2) {
if (index1 < index2) {
return -1;
} else if (index1 > index2) {
return 1;
} else {
return 0;
}
}
return 0;
};
}
function accumulateChanges(acc, [[key, tupleData], multiplicity]) {
const [value, orderByIndex] = tupleData;
const changes = acc.get(key) || {
deletes: 0,
inserts: 0,
value,
orderByIndex
};
if (multiplicity < 0) {
if (changes.deletes === 0) {
changes.previousValue = value;
changes.previousOrderByIndex = orderByIndex;
}
changes.deletes += Math.abs(multiplicity);
} else if (multiplicity > 0) {
changes.inserts += multiplicity;
changes.value = value;
if (orderByIndex !== void 0) {
changes.orderByIndex = orderByIndex;
}
}
acc.set(key, changes);
return acc;
}
function hasOrderOnlyMove(changesToApply) {
for (const changes of changesToApply.values()) {
const isUpdate = changes.inserts > 0 && changes.deletes > 0;
if (isUpdate && changes.previousValue !== void 0 && deepEquals(changes.previousValue, changes.value) && changes.orderByIndex !== changes.previousOrderByIndex) {
return true;
}
}
return false;
}
function markLayoutChange(collection) {
collection._markLayoutChange();
}
export {
CollectionConfigBuilder
};
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