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index.cjs
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index.cjs
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const { PerformanceObserver, performance } = require('node:perf_hooks');
class TraceEvents {
_eventObjects;
_observer;
constructor() {
this._eventObjects = [];
this._observer = new PerformanceObserver((perfEntryList) => {
const measures = perfEntryList.getEntriesByType('measure');
measures.forEach((measure) => {
this._eventObjects.push({
name: measure.name,
cat: measure.entryType,
ph: "X",
pid: 1,
ts: Math.round(measure.startTime * 1000),
dur: Math.round(measure.duration * 1000),
});
});
});
this._observer.observe({ type: 'measure', buffered: true });
}
destroy() {
this._observer.disconnect();
}
getEvents() {
return this._eventObjects;
}
}
// Monkey patching require().
// Refs: https://stackoverflow.com/a/42883538
const Module = require('module');
const originalRequire = Module.prototype.require;
function trackRequires(shouldTrackRequires) {
if (shouldTrackRequires) {
Module.prototype.require = function () {
performance.mark(`require("${arguments[0]}")`);
const ret = originalRequire.apply(this, arguments);
performance.measure(`require("${arguments[0]}")`, `require("${arguments[0]}")`);
return ret;
};
} else {
Module.prototype.require = originalRequire;
}
}
module.exports = {
TraceEvents,
trackRequires,
};