Ole-Morten Duesund
e8428de775
Vite + TypeScript PWA that mirrors the Android app's core features: - Pre-processed shelter data (build-time UTM33N→WGS84 conversion) - Leaflet map with shelter markers, user location, and offline tiles - Canvas compass arrow (ported from DirectionArrowView.kt) - IndexedDB shelter cache with 7-day staleness check - Service worker with CacheFirst tiles and precached app shell - i18n for en, nb, nn (ported from Android strings.xml) - iOS/Android compass handling with low-pass filter - Respects user map interaction (no auto-snap on pan/zoom) - Build revision cache-breaker for reliable SW updates Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
37 lines
941 B
JavaScript
37 lines
941 B
JavaScript
/** Used to detect hot functions by number of calls within a span of milliseconds. */
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var HOT_COUNT = 800,
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HOT_SPAN = 16;
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeNow = Date.now;
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/**
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* Creates a function that'll short out and invoke `identity` instead
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* of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
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* milliseconds.
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*
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* @private
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* @param {Function} func The function to restrict.
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* @returns {Function} Returns the new shortable function.
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*/
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function shortOut(func) {
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var count = 0,
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lastCalled = 0;
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return function() {
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var stamp = nativeNow(),
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remaining = HOT_SPAN - (stamp - lastCalled);
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lastCalled = stamp;
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if (remaining > 0) {
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if (++count >= HOT_COUNT) {
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return arguments[0];
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}
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} else {
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count = 0;
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}
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return func.apply(undefined, arguments);
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};
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}
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module.exports = shortOut;
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