import type { Aggregator } from './../interfaces/aggregator.interface';
export declare class SumAggregator implements Aggregator {
    private _sum;
    private _field;
    private _type;
    constructor(field: number | string);
    get field(): number | string;
    get type(): string;
    init(): void;
    accumulate(item: any): void;
    storeResult(groupTotals: any): void;
}
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