@electric-sql/d2mini/dist/operators/debug.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 logs debug information about the stream
 */
export class DebugOperator extends UnaryOperator {
    #name;
    #indent;
    constructor(id, inputA, output, name, indent = false) {
        super(id, inputA, output);
        this.#name = name;
        this.#indent = indent;
    }
    run() {
        for (const message of this.inputMessages()) {
            // eslint-disable-next-line no-console
            console.log(`debug ${this.#name} data: ${message.toString(this.#indent)}`);
            this.output.sendData(message);
        }
    }
}
/**
 * Logs debug information about the stream using console.log
 * @param name - The name to prefix debug messages with
 * @param indent - Whether to indent the debug output
 */
export function debug(name, indent = false) {
    return (stream) => {
        const output = new StreamBuilder(stream.graph, new DifferenceStreamWriter());
        const operator = new DebugOperator(stream.graph.getNextOperatorId(), stream.connectReader(), output.writer, name, indent);
        stream.graph.addOperator(operator);
        stream.graph.addStream(output.connectReader());
        return output;
    };
}
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