rxdb
Version:
A local-first realtime NoSQL Database for JavaScript applications - https://rxdb.info/
47 lines (46 loc) • 1.51 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.now = now;
/**
* Returns the current unix time in milliseconds (with two decimals!)
* Because the accuracy of getTime() in javascript is bad,
* and we cannot rely on performance.now() on all platforms,
* this method implements a way to never return the same value twice.
* This ensures that when now() is called often, we do not loose the information
* about which call came first and which came after.
*
* We had to move from having no decimals, to having two decimal
* because it turned out that some storages are such fast that
* calling this method too often would return 'the future'.
*
* Tracks the current millisecond and a sub-millisecond counter (1-99)
* separately as integers to avoid floating point rounding errors
* and eliminate the need for Math.round().
*/
var _lastNowMs = 0;
var _lastNowSub = 0;
/**
* Returns the current time in milliseconds,
* also ensures to not return the same value twice.
*/
function now() {
var dateNow = Date.now();
if (dateNow > _lastNowMs) {
_lastNowMs = dateNow;
/**
* Start at 1 (not 0) so the returned value is always
* dateNow + 0.01 at minimum, matching the original behavior
* of always adding 0.01 to Date.now().
*/
_lastNowSub = 1;
} else {
if (++_lastNowSub === 100) {
_lastNowMs++;
_lastNowSub = 1;
}
}
return _lastNowMs + _lastNowSub * 0.01;
}
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