declare class AggregationBuilder {
    private pipeline;
    private lastGroupStage;
    private ensureGroupStage;
    match(field: string, condition: Record<string, any>): this;
    group(groupBy: string | Record<string, any>): this;
    sum(value: string, key: string): this;
    avg(value: string, key: string): this;
    min(value: string, key: string): this;
    max(value: string, key: string): this;
    first(value: string, key: string): this;
    last(value: string, key: string): this;
    push(field: string, key?: string): this;
    addToSet(value: string, key: string): this;
    stdDevPop(value: string, key: string): this;
    stdDevSamp(value: string, key: string): this;
    mergeObjects(value: string, key: string): this;
    count(key?: string): this;
    project(projection: Record<string, any>): this;
    sort(sortFields: Record<string, "asc" | "desc">): this;
    limit(n: number): this;
    skip(n: number): this;
    lookup(from: string, localField: string, foreignField: string, as: string): this;
    unset(...fields: string[]): this;
    addFields(fields: Record<string, any>): this;
    replaceRoot(newRoot: any): this;
    replaceWith(replacement: any): this;
    graphLookup(options: {
        from: string;
        startWith: any;
        connectFromField: string;
        connectToField: string;
        as: string;
        maxDepth?: number;
        depthField?: string;
        restrictSearchWithMatch?: Record<string, any>;
    }): this;
    unwind(field: string | Record<string, any>): this;
    bucket(options: {
        groupBy: any;
        boundaries: any[];
        default?: any;
        output: Record<string, any>;
    }): this;
    bucketAuto(options: {
        groupBy: any;
        buckets: number;
        output?: Record<string, any>;
        granularity?: string;
    }): this;
    facet(facets: Record<string, any[]>): this;
    merge(options: string | Record<string, any>): this;
    out(collectionName: string): this;
    search(searchStage: Record<string, any>): this;
    searchMeta(searchStage: Record<string, any>): this;
    redact(expression: any): this;
    indexStats(): this;
    currentOp(): this;
    collStats(): this;
    planCacheStats(): this;
    listSessions(): this;
    build(): any[];
}
export default AggregationBuilder;