@electric-sql/d2mini/dist/operators/output.js

D2Mini is a minimal implementation of Differential Dataflow for performing in-memory incremental view maintenance.

import { DifferenceStreamWriter, UnaryOperator, } from '../graph.js';
import { StreamBuilder } from '../d2.js';
/**
 * Operator that outputs the messages in the stream
 */
export class OutputOperator extends UnaryOperator {
    #fn;
    constructor(id, inputA, output, fn) {
        super(id, inputA, output);
        this.#fn = fn;
    }
    run() {
        for (const message of this.inputMessages()) {
            this.#fn(message);
            this.output.sendData(message);
        }
    }
}
/**
 * Outputs the messages in the stream
 * @param fn - The function to call with each message
 */
export function output(fn) {
    return (stream) => {
        const output = new StreamBuilder(stream.graph, new DifferenceStreamWriter());
        const operator = new OutputOperator(stream.graph.getNextOperatorId(), stream.connectReader(), output.writer, fn);
        stream.graph.addOperator(operator);
        stream.graph.addStream(output.connectReader());
        return output;
    };
}
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