mirror of https://github.com/sveltejs/svelte
add a stats object with timings (#1257)
parent
0f5912f316
commit
75c1fbcf7b
@ -0,0 +1,73 @@
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const now = (typeof process !== 'undefined' && process.hrtime)
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? () => {
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const t = process.hrtime();
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return t[0] * 1e3 + t[1] / 1e6;
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}
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: () => window.performance.now();
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type Timing = {
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label: string;
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start: number;
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end: number;
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children: Timing[];
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}
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function collapseTimings(timings) {
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const result = {};
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timings.forEach(timing => {
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result[timing.label] = Object.assign({
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total: timing.end - timing.start
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}, timing.children && collapseTimings(timing.children));
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});
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return result;
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}
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export default class Stats {
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startTime: number;
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currentTiming: Timing;
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currentChildren: Timing[];
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timings: Timing[];
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stack: Timing[];
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constructor() {
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this.startTime = now();
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this.stack = [];
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this.currentChildren = this.timings = [];
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}
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start(label) {
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const timing = {
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label,
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start: now(),
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end: null,
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children: []
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};
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this.currentChildren.push(timing);
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this.stack.push(timing);
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this.currentTiming = timing;
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this.currentChildren = timing.children;
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}
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stop(label) {
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if (label !== this.currentTiming.label) {
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throw new Error(`Mismatched timing labels`);
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}
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this.currentTiming.end = now();
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this.stack.pop();
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this.currentTiming = this.stack[this.stack.length - 1];
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this.currentChildren = this.currentTiming ? this.currentTiming.children : this.timings;
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}
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toJSON() {
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const timings = Object.assign({
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total: now() - this.startTime
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}, collapseTimings(this.timings));
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return {
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timings
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};
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}
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}
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