@lodestar/beacon-node/lib/metrics/utils/gauge.js

A Typescript implementation of the beacon chain

import { Gauge } from "prom-client";
/**
 * Extends the prom-client Gauge to be able to add multiple collect functions after instantiation
 */
export class GaugeExtra extends Gauge {
    constructor() {
        super(...arguments);
        this.collectFns = [];
    }
    addCollect(collectFn) {
        this.collectFns.push(collectFn);
    }
    /**
     * @override Metric.collect
     */
    collect() {
        for (const collectFn of this.collectFns) {
            collectFn(this);
        }
    }
}
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