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export class InitPerformanceTracer {
results: {name: string, dur: number}[] = [];
recordCall(name: string, func: ()=>void) {
const start = performance.now();
func();
this.results.push({name, dur: performance.now() - start});
}
printResults() {
this.results = this.results.sort((a, b) => b.dur - a.dur);
for (let i = 0; i < 20 && i < this.results.length; i++) {
console.info(`performance trace: ${this.results[i].name} ${this.results[i].dur.toFixed(3)}`);
}
}
}
export function callInitFunctions(functions: (() => any)[]): InitPerformanceTracer | null {
// Start performance trace by accessing a URL by "https://localhost/?_ui_performance_trace=1" or "https://localhost/?key=value&_ui_performance_trace=1"
// It is a quick check, no side effect so no need to do slow URL parsing.
const perfTracer = !window.location.search.includes('_ui_performance_trace=1') ? null : new InitPerformanceTracer();
if (perfTracer) {
for (const func of functions) perfTracer.recordCall(func.name, func);
} else {
for (const func of functions) func();
}
return perfTracer;
}
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