@electric-sql/d2ts/dist/sqlite/operators/reduce.d.ts

D2TS is a TypeScript implementation of Differential Dataflow.

import { IStreamBuilder, KeyValue } from '../../types.js';
import { DifferenceStreamReader, DifferenceStreamWriter, UnaryOperator } from '../../graph.js';
import { Antichain } from '../../order.js';
import { SQLiteDb } from '../database.js';
/**
 * SQLite version of the ReduceOperator
 */
export declare class ReduceOperatorSQLite<K, V1, V2> extends UnaryOperator<[
    K,
    V1 | V2
]> {
    #private;
    constructor(id: number, inputA: DifferenceStreamReader<[K, V1]>, output: DifferenceStreamWriter<[K, V2]>, f: (values: [V1, number][]) => [V2, number][], initialFrontier: Antichain, db: SQLiteDb);
    run(): void;
    destroy(): void;
}
/**
 * Reduces the elements in the stream by key
 * Persists state to SQLite
 *
 * @param f - The reduction function
 * @param db - Optional SQLite database (can be injected via context)
 */
export declare function reduce<K extends T extends KeyValue<infer K, infer _V> ? K : never, V1 extends T extends KeyValue<K, infer V> ? V : never, R, T>(f: (values: [V1, number][]) => [R, number][], db?: SQLiteDb): (stream: IStreamBuilder<T>) => IStreamBuilder<KeyValue<K, R>>;