next/dist/esm/lib/memory/gc-observer.js

The React Framework

import { PerformanceObserver } from 'perf_hooks';
import { warn } from '../../build/output/log';
import { bold } from '../picocolors';
const LONG_RUNNING_GC_THRESHOLD_MS = 15;
const gcEvents = [];
const obs = new PerformanceObserver((list)=>{
    const entry = list.getEntries()[0];
    gcEvents.push(entry);
    if (entry.duration > LONG_RUNNING_GC_THRESHOLD_MS) {
        warn(bold(`Long running GC detected: ${entry.duration.toFixed(2)}ms`));
    }
});
/**
 * Starts recording garbage collection events in the process and warn on long
 * running GCs. To disable, call `stopObservingGc`.
 */ export function startObservingGc() {
    obs.observe({
        entryTypes: [
            'gc'
        ]
    });
}
export function stopObservingGc() {
    obs.disconnect();
}
/**
 * Returns all recorded garbage collection events. This function will only
 * return information from when `startObservingGc` was enabled and before
 * `stopObservingGc` was called.
 */ export function getGcEvents() {
    return gcEvents;
}

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