@pujansrt/data-genie/dist/transformers/group-by-reader.d.ts

High performant ETL engine written in TypeScript

import { DataReader, DataRecord } from '../core/interfaces';
import { DataTransformer } from '../transformers/transformers';
export declare class GroupByReader extends DataTransformer {
    private groupByField;
    private aggregations;
    constructor(reader: DataReader, groupByField: string);
    count(outputField: string): this;
    sum(sourceField: string, outputField: string): this;
    max(sourceField: string, outputField: string): this;
    min(sourceField: string, outputField: string): this;
    avg(sourceField: string, outputField: string): this;
    read(): AsyncIterableIterator<DataRecord>;
}