51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
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"use strict";
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/*
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This is https://github.com/cabinjs/browser-hrtime/blob/master/src/index.ts
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but modified to not use window, since I want to use this in a WebWorker.
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Upstream is MIT license.
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This also doesn't define any global variables.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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const _perfomancePolyfill = () => {
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// based on https://gist.github.com/paulirish/5438650 copyright Paul Irish 2015.
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if (!("performance" in self)) {
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self.performance = {};
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}
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Date.now =
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Date.now ||
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(() => {
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// thanks IE8
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return new Date().getTime();
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});
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if ("now" in self.performance === false) {
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let nowOffset = Date.now();
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if (performance.timing && performance.timing.navigationStart) {
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nowOffset = performance.timing.navigationStart;
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}
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self.performance.now = () => Date.now() - nowOffset;
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}
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};
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const _hrtime = (previousTimestamp) => {
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_perfomancePolyfill();
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const baseNow = Math.floor((Date.now() - performance.now()) * 1e-3);
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const clocktime = performance.now() * 1e-3;
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let seconds = Math.floor(clocktime) + baseNow;
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let nanoseconds = Math.floor((clocktime % 1) * 1e9);
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if (previousTimestamp) {
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seconds = seconds - previousTimestamp[0];
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nanoseconds = nanoseconds - previousTimestamp[1];
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if (nanoseconds < 0) {
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seconds--;
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nanoseconds += 1e9;
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}
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}
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return [seconds, nanoseconds];
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};
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const NS_PER_SEC = 1e9;
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_hrtime.bigint = (time) => {
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const diff = _hrtime(time);
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return (diff[0] * NS_PER_SEC + diff[1]);
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};
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exports.default = _hrtime;
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//# sourceMappingURL=browser-hrtime.js.map
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