import { AggregateField } from 'firebase-admin/firestore';
import type { ProjectContext } from '../../../project';
import { Task } from '../../../task';
import type { OperationSchema } from '../../build-tool';
import type { FirestorePropKey } from '../properties';
import { QueryFilter } from '../utils/types';
export declare class FirestoreAggregateError extends Error {
    readonly cause?: unknown | undefined;
    readonly _tag: "FirestoreAggregateError";
    constructor(message: string, cause?: unknown | undefined);
}
export declare const AGGREGATE_COLLECTION: "aggregate_collection";
export declare const aggregateCollectionOp: OperationSchema<FirestorePropKey>;
export interface AggregationSpec {
    alias: string;
    type: 'sum' | 'avg' | 'count';
    field?: string;
}
export interface AggregateCollectionArgs {
    collection: string;
    aggregations: AggregationSpec[];
    filters?: QueryFilter[];
}
export declare const aggregateCollection: (ctx: ProjectContext, input: AggregateCollectionArgs) => Task<{
    collection: string;
    result: FirebaseFirestore.AggregateSpecData<{
        [k: string]: AggregateField<number>;
    }>;
}, import("../../../project").AccessDeniedError | FirestoreAggregateError>;
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