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Virtual props implementation (#1213)
* feat: add virtual properties core support * test: update expectations for virtual props * ci: apply automated fixes * Fix virtual props semantics and types * ci: apply automated fixes * Deduplicate test helpers and emit synced flips Co-authored-by: sam.willis <[email protected]> * ci: apply automated fixes * Fix tests for virtual props helpers * Fix type constraints in tests * Update local-only and test typings * ci: apply automated fixes * Fix type expectations for virtual props * Align query key types in tests * Adjust key types in type tests * Update query type tests for virtual props * Align query types with expectations * Use string in query type tests * Expect numeric in query types * Use union in query type tests * Relax query type assertions for * Loosen join query key expectations * ci: apply automated fixes * Default OutputWithVirtual key to union * Update query tests for virtual props * test: strip virtual props in query expectations * test: normalize virtual props in truncate/group/indexes * ci: apply automated fixes * test: strip virtual props in collection/local-only * ci: apply automated fixes * test: fix remaining virtual props expectations * fix: preserve local origin across sync confirmation * ci: apply automated fixes * fix: account for virtual sync confirmations * ci: apply automated fixes * fix: keep optimistic state until sync * fix: track pending local origins * fix: persist direct optimistic state * fix: handle virtual prop filters and origins * fix: carry virtual props through query output * feat: cache virtual props with WeakMap * ci: apply automated fixes * fix: restore virtual props helper import * chore: reuse db test utils in query-db * test: align electric type tests with virtual props * ci: apply automated fixes * test: normalize electric tag state for virtual props * ci: apply automated fixes * test: strip virtual props in electric integration assertions * test: normalize electric collection state comparisons * test: strip virtual props in rxdb assertions * test: align react useLiveQuery types with virtual props * test: strip virtual props in query-db-collection tests * test: strip virtual props in query-db cache comparisons * test: strip virtual props in trailbase state assertions * test: align vue useLiveQuery types with virtual props * fix query select types include virtual props * ci: apply automated fixes * update subquery type tests for virtual props * loosen select result key type for virtual props * relax join and group-by type assertions * align subscribeChanges options with virtual props * document virtual props in live query docs * document virtual props in live queries guide * add changeset for virtual props updates * ci: apply automated fixes * update changeset summary for virtual props * fix tests for virtual props and queryOnce typing Align local-only and group-by expectations with virtual props on returned rows, and make queryOnce's array return cast explicit for the updated type constraints. Made-with: Cursor * refactor group-by aggregate setup Reuse the per-query virtual aggregate map directly instead of copying it before adding select aggregates. Made-with: Cursor * ci: apply automated fixes * fix angular live query type assertions Align Angular injectLiveQuery type tests with current live query result shapes, including virtual props and single-result inference. Made-with: Cursor * ci: apply automated fixes * fix package test suites across frameworks Update stale React assertions for virtual props, switch PowerSync tests to the supported sqlite backend with its test dependency, and add DOM libs for TrailBase package typechecking. Made-with: Cursor * ci: apply automated fixes * make powersync test backend selection robust Use a supported sqlite backend when available and skip the PowerSync integration suites on runtimes that do not support either backend path. Made-with: Cursor * ci: apply automated fixes * fix powersync sqlite backend probe Verify that better-sqlite3 can actually open a database before selecting it for PowerSync tests so CI can fall back cleanly when native bindings are unavailable. Made-with: Cursor * fix db virtual prop edge cases Address truncate and failed-transaction virtual prop cleanup, preserve previousValue snapshots for optimistic changes, and tighten the virtual prop typing/tests. Made-with: Cursor * fix lockfile for powersync sqlite peer Regenerate pnpm-lock.yaml so the powersync package manifest and frozen-lockfile installs agree in CI. Made-with: Cursor * ci: apply automated fixes * ci: apply automated fixes --------- Co-authored-by: Cursor Agent <[email protected]> Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
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‎.changeset/shiny-planes-laugh.md‎

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---
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'@tanstack/db': patch
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---
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Implement virtual properties end-to-end, including live query behavior and
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typing support for virtual metadata on rows.

‎docs/guides/live-queries.md‎

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The result types are automatically inferred from your query structure, providing full TypeScript support. When you use a `select` clause, the result type matches your projection. Without `select`, you get the full schema with proper join optionality.
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## Virtual properties
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Live query results include computed, read-only virtual properties on every row:
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- `$synced`: `true` when the row is confirmed by sync; `false` when it is still optimistic.
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- `$origin`: `"local"` if the last confirmed change came from this client, otherwise `"remote"`.
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- `$key`: the row key for the result.
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- `$collectionId`: the source collection ID.
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These props can be used in `where`, `select`, and `orderBy` clauses. They are added to
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query outputs automatically and should not be persisted back to storage.
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## Table of Contents
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- [Creating Live Query Collections](#creating-live-query-collections)

‎packages/angular-db/tests/inject-live-query.test-d.ts‎

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@@ -7,6 +7,7 @@ import {
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liveQueryCollectionOptions,
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} from '../../db/src/query/index'
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import { injectLiveQuery } from '../src/index'
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import type { OutputWithVirtual } from '../../db/tests/utils'
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import type { SingleResult } from '../../db/src/types'
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type Person = {
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.findOne(),
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)
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// findOne returns a single result or undefined
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expectTypeOf(data()).toEqualTypeOf<Person | undefined>()
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expectTypeOf(data()).toMatchTypeOf<OutputWithVirtual<Person> | undefined>()
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})
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it(`should type findOne config object to return a single row`, () => {
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.findOne(),
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})
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// findOne returns a single result or undefined
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expectTypeOf(data()).toEqualTypeOf<Person | undefined>()
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expectTypeOf(data()).toMatchTypeOf<OutputWithVirtual<Person> | undefined>()
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})
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it(`should type findOne collection using liveQueryCollectionOptions to return a single row`, () => {
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const { data } = injectLiveQuery(liveQueryCollection)
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// findOne returns a single result or undefined
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expectTypeOf(data()).toEqualTypeOf<Person | undefined>()
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expectTypeOf(data()).toMatchTypeOf<OutputWithVirtual<Person> | undefined>()
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})
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it(`should type findOne collection using createLiveQueryCollection to return a single row`, () => {
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const { data } = injectLiveQuery(liveQueryCollection)
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// findOne returns a single result or undefined
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expectTypeOf(data()).toEqualTypeOf<Person | undefined>()
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expectTypeOf(data()).toMatchTypeOf<OutputWithVirtual<Person> | undefined>()
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})
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it(`should type regular query to return an array`, () => {
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})),
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)
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// Regular queries should return an array
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expectTypeOf(data()).toEqualTypeOf<Array<{ id: string; name: string }>>()
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expectTypeOf(data()).toMatchTypeOf<
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Array<OutputWithVirtual<{ id: string; name: string }>>
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>()
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})
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})

‎packages/db/src/collection/change-events.ts‎

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import type { CollectionImpl } from './index.js'
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import type { SingleRowRefProxy } from '../query/builder/ref-proxy'
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import type { BasicExpression, OrderBy } from '../query/ir.js'
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import type { WithVirtualProps } from '../virtual-props.js'
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/**
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* Returns the current state of the collection as an array of changes
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T extends object,
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TKey extends string | number,
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>(
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collection: CollectionLike<T, TKey>,
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collection: CollectionLike<WithVirtualProps<T, TKey>, TKey>,
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options: CurrentStateAsChangesOptions = {},
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): Array<ChangeMessage<T>> | void {
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): Array<ChangeMessage<WithVirtualProps<T, TKey>, TKey>> | void {
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// Helper function to collect filtered results
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const collectFilteredResults = (
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filterFn?: (value: T) => boolean,
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): Array<ChangeMessage<T>> => {
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const result: Array<ChangeMessage<T>> = []
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filterFn?: (value: WithVirtualProps<T, TKey>) => boolean,
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): Array<ChangeMessage<WithVirtualProps<T, TKey>, TKey>> => {
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const result: Array<ChangeMessage<WithVirtualProps<T, TKey>, TKey>> = []
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for (const [key, value] of collection.entries()) {
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// If no filter function is provided, include all items
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if (filterFn?.(value) ?? true) {
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}
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// Convert keys to change messages
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const result: Array<ChangeMessage<T>> = []
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const result: Array<ChangeMessage<WithVirtualProps<T, TKey>, TKey>> = []
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for (const key of orderedKeys) {
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const value = collection.get(key)
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if (value !== undefined) {
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if (optimizationResult.canOptimize) {
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// Use index optimization
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const result: Array<ChangeMessage<T>> = []
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const result: Array<ChangeMessage<WithVirtualProps<T, TKey>, TKey>> = []
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for (const key of optimizationResult.matchingKeys) {
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const value = collection.get(key)
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if (value !== undefined) {
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* @param options - The subscription options containing the where clause
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* @returns A filtered callback function
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*/
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export function createFilteredCallback<T extends object>(
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export function createFilteredCallback<
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T extends object,
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TKey extends string | number = string | number,
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>(
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originalCallback: (changes: Array<ChangeMessage<T>>) => void,
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options: SubscribeChangesOptions,
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options: SubscribeChangesOptions<T, TKey>,
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): (changes: Array<ChangeMessage<T>>) => void {
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const filterFn = createFilterFunctionFromExpression(options.whereExpression!)
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‎packages/db/src/collection/changes.ts‎

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@@ -10,6 +10,8 @@ import type { CollectionLifecycleManager } from './lifecycle.js'
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import type { CollectionSyncManager } from './sync.js'
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import type { CollectionEventsManager } from './events.js'
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import type { CollectionImpl } from './index.js'
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import type { CollectionStateManager } from './state.js'
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import type { WithVirtualProps } from '../virtual-props.js'
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export class CollectionChangesManager<
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TOutput extends object = Record<string, unknown>,
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private sync!: CollectionSyncManager<TOutput, TKey, TSchema, TInput>
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private events!: CollectionEventsManager
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private collection!: CollectionImpl<TOutput, TKey, any, TSchema, TInput>
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private state!: CollectionStateManager<TOutput, TKey, TSchema, TInput>
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public activeSubscribersCount = 0
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public changeSubscriptions = new Set<CollectionSubscription>()
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sync: CollectionSyncManager<TOutput, TKey, TSchema, TInput>
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events: CollectionEventsManager
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collection: CollectionImpl<TOutput, TKey, any, TSchema, TInput>
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state: CollectionStateManager<TOutput, TKey, TSchema, TInput>
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}) {
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this.lifecycle = deps.lifecycle
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this.sync = deps.sync
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this.events = deps.events
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this.collection = deps.collection
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this.state = deps.state
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}
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/**
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}
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}
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/**
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* Enriches a change message with virtual properties ($synced, $origin, $key, $collectionId).
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* Uses the "add-if-missing" pattern to preserve virtual properties from upstream collections.
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*/
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private enrichChangeWithVirtualProps(
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change: ChangeMessage<TOutput, TKey>,
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): ChangeMessage<WithVirtualProps<TOutput, TKey>, TKey> {
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return this.state.enrichChangeMessage(change)
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}
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/**
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* Emit events either immediately or batch them for later emission
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*/
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// Either we're not batching, or we're forcing emission (user action or ending batch cycle)
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let eventsToEmit = changes
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let rawEvents = changes
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if (forceEmit) {
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// Force emit is used to end a batch (e.g. after a sync commit). Combine any
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// buffered optimistic events with the final changes so subscribers see the
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// whole picture, even if the sync diff is empty.
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if (this.batchedEvents.length > 0) {
80-
eventsToEmit = [...this.batchedEvents, ...changes]
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rawEvents = [...this.batchedEvents, ...changes]
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}
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this.batchedEvents = []
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this.shouldBatchEvents = false
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}
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if (eventsToEmit.length === 0) {
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if (rawEvents.length === 0) {
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return
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}
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// Enrich all change messages with virtual properties
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// This uses the "add-if-missing" pattern to preserve pass-through semantics
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const enrichedEvents: Array<
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ChangeMessage<WithVirtualProps<TOutput, TKey>, TKey>
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> = rawEvents.map((change) => this.enrichChangeWithVirtualProps(change))
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// Emit to all listeners
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for (const subscription of this.changeSubscriptions) {
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subscription.emitEvents(eventsToEmit)
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subscription.emitEvents(enrichedEvents)
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}
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}
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/**
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* Subscribe to changes in the collection
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*/
99120
public subscribeChanges(
100-
callback: (changes: Array<ChangeMessage<TOutput>>) => void,
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options: SubscribeChangesOptions<TOutput> = {},
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callback: (
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changes: Array<ChangeMessage<WithVirtualProps<TOutput, TKey>>>,
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) => void,
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options: SubscribeChangesOptions<TOutput, TKey> = {},
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): CollectionSubscription {
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// Start sync and track subscriber
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this.addSubscriber()
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const { where, ...opts } = options
114137
let whereExpression = opts.whereExpression
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if (where) {
116-
const proxy = createSingleRowRefProxy<TOutput>()
139+
const proxy = createSingleRowRefProxy<WithVirtualProps<TOutput, TKey>>()
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const result = where(proxy)
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whereExpression = toExpression(result)
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}

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