Snapshot queries

SnapshotQueryClient<S,FIELDS>(apiMetadata?) queries materialized snapshots. Every query method is POST. The final optional controller allows cancellation; attributes are execution metadata, not JSON body fields. Request projection can make a result partial: the generic T must honestly describe selected fields rather than asserting missing fields exist.

Method	Relative endpoint	Promise result
single / singleState	snapshot/single, snapshot/single/state	MaterializedSnapshot<S> / S
list / listState	snapshot/list, snapshot/list/state	Snapshot[] / S[]
listStream / listStateStream	Same list endpoints, SSE Accept	ReadableStream of JSON SSE snapshots / states
paged / pagedState	snapshot/paged, snapshot/paged/state	PagedList with total/list
count	snapshot/count	number; body is Condition or FilterExpression directly
cursor / cursorState	snapshot/cursor, snapshot/cursor/state	CursorPage with list/nextCursor
aggregate / aggregateStream	snapshot/aggregation	DynamicDocument[] or JSON SSE rows

Each concrete method takes (query, attributes?, abortController?); getById/getStateById take an id instead of a query, construct a legacy aggregateId condition and use single/singleState. getByIds/getStateByIds take string[], use the new aggregateIds filter and limit equal to input length. Empty IDs return Promise.resolve([]) without a request. Do not assume the server preserves input ID order.

MaterializedSnapshot combines state S with context/aggregate/tenant/owner/space identity, version, event/time/operator data, tags and deleted. MediumMaterializedSnapshot omits some full snapshot fields; SmallMaterializedSnapshot retains state, named aggregate, version and firstEventTime. They are structural models, not converters. SnapshotMetadataFields provides exact logical metadata names; state paths typically live below state.

No result cache or consistency wait is added by these clients. Read-after-command visibility depends on the server projection and requested wait stage. A missing single result is still typed Promise<T>; this package does not normalize absence into T | null. Handle the actual endpoint's HTTP/result contract and Fetcher errors. Stream consumption/reader cleanup belongs to the caller. See query options, cursor, aggregation.

Complete example

import {
  SnapshotQueryClient,
  pagedQuery,
  filter,
  asc,
} from '@ahoo-wang/fetcher-wow';
interface User {
  id: string;
  name: string;
}
const client = new SnapshotQueryClient<User>({ basePath: '/users' });
export async function firstPage(controller = new AbortController()) {
  return client.pagedState(
    pagedQuery({
      filter: filter.eq('state.active', true),
      pagination: { index: 1, size: 20 },
      sort: [asc('state.name')],
    }),
    undefined,
    controller,
  );
}

Service URLs in examples require application endpoints; type checking does not imply an external service was contacted.

Public signatures and types

These signatures follow declarations reachable from the current root entry. ? marks optional input; generics/interfaces only constrain compile-time types. Locate inherited and related types through the symbol index. Runtime defaults and failure behavior are described above.

QueryApi

Expand all fields and members

export interface QueryApi<R, FIELDS extends string = string> {
  cursor<T extends Partial<R> = R>(
    query: CursorQuery<FIELDS>,
    attributes?: Record<string, unknown>,
    abortController?: AbortController,
  ): Promise<CursorPage<T>>;
  aggregate<
    Row extends DynamicDocument = DynamicDocument,
    AGGREGATION_FIELDS extends string = string,
  >(
    query: AggregationQuery<FIELDS, AGGREGATION_FIELDS>,
    attributes?: Record<string, any>,
    abortController?: AbortController,
  ): Promise<Row[]>;
  aggregateStream<
    Row extends DynamicDocument = DynamicDocument,
    AGGREGATION_FIELDS extends string = string,
  >(
    query: AggregationQuery<FIELDS, AGGREGATION_FIELDS>,
    attributes?: Record<string, any>,
    abortController?: AbortController,
  ): Promise<ReadableStream<JsonServerSentEvent<Row>>>;
  single<T extends Partial<R> = R>(
    singleQuery: SingleQueryRequest<FIELDS>,
    attributes?: Record<string, any>,
  ): Promise<T>;
  list<T extends Partial<R> = R>(
    listQuery: ListQueryRequest<FIELDS>,
    attributes?: Record<string, any>,
  ): Promise<T[]>;
  listStream<T extends Partial<R> = R>(
    listQuery: ListQueryRequest<FIELDS>,
    attributes?: Record<string, any>,
  ): Promise<ReadableStream<JsonServerSentEvent<T>>>;
  paged<T extends Partial<R> = R>(
    pagedQuery: PagedQueryRequest<FIELDS>,
    attributes?: Record<string, any>,
  ): Promise<PagedList<T>>;
  count(
    filter: FilterExpression<FIELDS> | Condition<FIELDS>,
    attributes?: Record<string, any>,
  ): Promise<number>;
}

packages/wow/src/query/queryApi.ts:36

MaterializedSnapshot

export interface MaterializedSnapshot<S>
  extends
    StateCapable<S>,
    AggregateId,
    TenantId,
    OwnerId,
    SpaceIdCapable,
    Version,
    EventIdCapable,
    FirstOperatorCapable,
    OperatorCapable,
    FirstEventTimeCapable,
    EventTimeCapable,
    SnapshotTimeCapable,
    AbacTaggable,
    DeletedCapable {}

packages/wow/src/query/snapshot/snapshot.ts:35

MediumMaterializedSnapshot

export interface MediumMaterializedSnapshot<S>
  extends
    StateCapable<S>,
    NamedAggregate,
    TenantId,
    OwnerId,
    SpaceIdCapable,
    Version,
    EventIdCapable,
    FirstOperatorCapable,
    OperatorCapable,
    FirstEventTimeCapable,
    EventTimeCapable,
    AbacTaggable {}

packages/wow/src/query/snapshot/snapshot.ts:60

SmallMaterializedSnapshot

export interface SmallMaterializedSnapshot<S>
  extends StateCapable<S>, NamedAggregate, Version, FirstEventTimeCapable {}

packages/wow/src/query/snapshot/snapshot.ts:80

SnapshotMetadataFields

export class SnapshotMetadataFields {
  static readonly VERSION = 'version';
  static readonly TENANT_ID = 'tenantId';
  static readonly OWNER_ID = 'ownerId';
  static readonly SPACE_ID = 'spaceId';
  static readonly EVENT_ID = 'eventId';
  static readonly FIRST_EVENT_TIME = 'firstEventTime';
  static readonly EVENT_TIME = 'eventTime';
  static readonly FIRST_OPERATOR = 'firstOperator';
  static readonly OPERATOR = 'operator';
  static readonly SNAPSHOT_TIME = 'snapshotTime';
  static readonly TAGS = 'tags';
  static readonly DELETED = 'deleted';
  static readonly STATE = 'state';
}

packages/wow/src/query/snapshot/snapshot.ts:89

SnapshotQueryApi

Expand all fields and members

export interface SnapshotQueryApi<
  S,
  FIELDS extends string = string,
> extends QueryApi<MaterializedSnapshot<S>, FIELDS> {
  cursorState<T extends Partial<S> = S>(
    query: CursorQuery<FIELDS>,
    attributes?: Record<string, unknown>,
    abortController?: AbortController,
  ): Promise<CursorPage<T>>;
  singleState<T extends Partial<S> = S>(
    singleQuery: SingleQueryRequest<FIELDS>,
    attributes?: Record<string, any>,
    abortController?: AbortController,
  ): Promise<T>;
  listState<T extends Partial<S> = S>(
    listQuery: ListQueryRequest<FIELDS>,
    attributes?: Record<string, any>,
    abortController?: AbortController,
  ): Promise<T[]>;
  listStateStream<T extends Partial<S> = S>(
    listQuery: ListQueryRequest<FIELDS>,
    attributes?: Record<string, any>,
    abortController?: AbortController,
  ): Promise<ReadableStream<JsonServerSentEvent<T>>>;
  pagedState<T extends Partial<S> = S>(
    pagedQuery: PagedQueryRequest<FIELDS>,
    attributes?: Record<string, any>,
    abortController?: AbortController,
  ): Promise<PagedList<T>>;
}

packages/wow/src/query/snapshot/snapshotQueryApi.ts:31

SnapshotQueryEndpointPaths

export class SnapshotQueryEndpointPaths {
  static readonly SNAPSHOT_RESOURCE_NAME = 'snapshot';
  static readonly AGGREGATION = `${SnapshotQueryEndpointPaths.SNAPSHOT_RESOURCE_NAME}/aggregation`;
  static readonly COUNT = `${SnapshotQueryEndpointPaths.SNAPSHOT_RESOURCE_NAME}/count`;
  static readonly LIST = `${SnapshotQueryEndpointPaths.SNAPSHOT_RESOURCE_NAME}/list`;
  static readonly LIST_STATE = `${SnapshotQueryEndpointPaths.LIST}/state`;
  static readonly PAGED = `${SnapshotQueryEndpointPaths.SNAPSHOT_RESOURCE_NAME}/paged`;
  static readonly PAGED_STATE = `${SnapshotQueryEndpointPaths.PAGED}/state`;
  static readonly CURSOR = `${SnapshotQueryEndpointPaths.SNAPSHOT_RESOURCE_NAME}/cursor`;
  static readonly CURSOR_STATE = `${SnapshotQueryEndpointPaths.CURSOR}/state`;
  static readonly SINGLE = `${SnapshotQueryEndpointPaths.SNAPSHOT_RESOURCE_NAME}/single`;
  static readonly SINGLE_STATE = `${SnapshotQueryEndpointPaths.SINGLE}/state`;
}

packages/wow/src/query/snapshot/snapshotQueryApi.ts:118

SnapshotQueryClient

Expand all fields and members

export class SnapshotQueryClient<S, FIELDS extends string = string> implements SnapshotQueryApi<S, FIELDS>, ApiMetadataCapable {
    constructor(public readonly apiMetadata?: ApiMetadata);
    aggregate<Row extends DynamicDocument = DynamicDocument, AGGREGATION_FIELDS extends string = string>(query: AggregationQuery<FIELDS, AGGREGATION_FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<Row[]>;
    aggregateStream<Row extends DynamicDocument = DynamicDocument, AGGREGATION_FIELDS extends string = string>(query: AggregationQuery<FIELDS, AGGREGATION_FIELDS>, attributes?: Record<string, unknown>, abortController?: AbortController): Promise<ReadableStream<JsonServerSentEvent<Row>>>;
    cursor<T extends Partial<MaterializedSnapshot<S>> = MaterializedSnapshot<S>>(query: CursorQuery<FIELDS>, attributes?: Record<string, unknown>, abortController?: AbortController): Promise<CursorPage<T>>;
    cursorState<T extends Partial<S> = S>(query: CursorQuery<FIELDS>, attributes?: Record<string, unknown>, abortController?: AbortController): Promise<CursorPage<T>>;
    count(filter: FilterExpression<FIELDS> | Condition<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<number>;
    list<T extends Partial<MaterializedSnapshot<S>> = MaterializedSnapshot<S>>(listQuery: ListQueryRequest<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<T[]>;
    listStream<T extends Partial<MaterializedSnapshot<S>> = MaterializedSnapshot<S>>(listQuery: ListQueryRequest<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<ReadableStream<JsonServerSentEvent<T>>>;
    listState<T extends Partial<S> = S>(listQuery: ListQueryRequest<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<T[]>;
    listStateStream<T extends Partial<S> = S>(listQuery: ListQueryRequest<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<ReadableStream<JsonServerSentEvent<T>>>;
    paged<T extends Partial<MaterializedSnapshot<S>> = MaterializedSnapshot<S>>(pagedQuery: PagedQueryRequest<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<PagedList<T>>;
    pagedState<T extends Partial<S> = S>(pagedQuery: PagedQueryRequest<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<PagedList<T>>;
    single<T extends Partial<MaterializedSnapshot<S>> = MaterializedSnapshot<S>>(singleQuery: SingleQueryRequest<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<T>;
    singleState<T extends Partial<S> = S>(singleQuery: SingleQueryRequest<FIELDS>, attributes?: Record<string, any>, abortController?: AbortController): Promise<T>;
    getById(id: string, attributes?: Record<string, any>, abortController?: AbortController): Promise<MaterializedSnapshot<S>>;
    getStateById(id: string, attributes?: Record<string, any>, abortController?: AbortController): Promise<S>;
    getByIds(ids: string[], attributes?: Record<string, any>, abortController?: AbortController): Promise<MaterializedSnapshot<S>[]>;
    getStateByIds(ids: string[], attributes?: Record<string, any>, abortController?: AbortController): Promise<S[]>;
}

packages/wow/src/query/snapshot/snapshotQueryClient.ts:121

Related topics

Client configuration and metadata · Commands and wait results · Filter expressions and legacy conditions · Projection, sorting and pagination · Cursor queries · Aggregation builders · Events and historical state · Identity and resource attribution