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