keeweb/app/scripts/comp/app/start-profiler.js

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import { Logger } from 'util/logger';
const logger = new Logger('start-profiler');
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const networkTime = getNetworkTime();
let lastTs = window.htmlLoadTime;
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const operations = [
{ name: 'fetching', elapsed: networkTime },
{ name: 'parsing', elapsed: lastTs - networkTime }
];
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const StartProfiler = {
milestone(name) {
const ts = logger.ts();
const elapsed = ts - lastTs;
lastTs = ts;
operations.push({ name, elapsed });
},
report() {
const time = Math.round(performance.now());
const details = operations.map(op => `${op.name}: ${Math.round(op.elapsed)}ms`).join(', ');
logger.info(`Started in ${time}ms. Details: ${details}`);
}
};
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function getNetworkTime() {
let perfEntry;
if (performance.getEntriesByType) {
[perfEntry] = performance.getEntriesByType('navigation');
}
if (!perfEntry || !perfEntry.responseEnd || !perfEntry.fetchStart) {
perfEntry = performance.timing;
}
return perfEntry.responseEnd - perfEntry.fetchStart;
}
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StartProfiler.milestone('pre-init');
export { StartProfiler };