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// @ts-nocheck
const now = (typeof process !== 'undefined' && process.hrtime)
? () => {
const t = process.hrtime();
return t[0] * 1e3 + t[1] / 1e6;
}
: () => self.performance.now();
interface Timing {
label: string;
start: number;
end: number;
children: Timing[];
}
function collapse_timings(timings) {
const result = {};
timings.forEach(timing => {
result[timing.label] = Object.assign({
total: timing.end - timing.start
}, timing.children && collapse_timings(timing.children));
});
return result;
}
export default class Stats {
start_time: number;
current_timing: Timing;
current_children: Timing[];
timings: Timing[];
stack: Timing[];
constructor() {
this.start_time = now();
this.stack = [];
this.current_children = this.timings = [];
}
start(label) {
const timing = {
label,
start: now(),
end: null,
children: []
};
this.current_children.push(timing);
this.stack.push(timing);
this.current_timing = timing;
this.current_children = timing.children;
}
stop(label) {
if (label !== this.current_timing.label) {
throw new Error(`Mismatched timing labels (expected ${this.current_timing.label}, got ${label})`);
}
this.current_timing.end = now();
this.stack.pop();
this.current_timing = this.stack[this.stack.length - 1];
this.current_children = this.current_timing ? this.current_timing.children : this.timings;
}
render() {
const timings = Object.assign({
total: now() - this.start_time
}, collapse_timings(this.timings));
return {
timings
};
}
}
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