import type { Model } from './model';
import type { AggregationPipeline } from './aggregation';
import type { Database } from './database';
type AggregationResult = Record<string, unknown>;
export declare class AggregationEngine<T extends object = Record<string, unknown>> {
    private model;
    private database?;
    constructor(model: Model<T>, database?: Database | undefined);
    execute(pipeline: AggregationPipeline<T>): Promise<AggregationResult[]>;
    private executeStage;
    private match;
    private vectorSearch;
    private atlasSearch;
    private group;
    private initAccumulator;
    private applyAccumulator;
    private calculateStdDev;
    private project;
    private evaluateExpression;
    private getISOWeek;
    private getISOWeekYear;
    private formatDate;
    private addToDate;
    private dateDiff;
    private truncateDate;
    private evaluateCondition;
    private lookup;
    private unwind;
    private sort;
    private addFields;
    private replaceRoot;
    private sample;
    private resolveFieldPath;
    private bucket;
    private bucketAuto;
    private calculateGranularBoundaries;
    private facet;
    private out;
    private merge;
}
export {};
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