sgauthier
6e64e138e2
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31 lines
1.0 KiB
JavaScript
31 lines
1.0 KiB
JavaScript
/* eslint-disable no-bitwise */
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/**
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* Generate a unique key for any set of event options
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*/
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export default function eventOptionsKey(normalizedEventOptions) {
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if (!normalizedEventOptions) {
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return 0;
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}
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// If the browser does not support passive event listeners, the normalized
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// event options will be a boolean.
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if (normalizedEventOptions === true) {
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return 100;
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}
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// At this point, the browser supports passive event listeners, so we expect
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// the event options to be an object with possible properties of capture,
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// passive, and once.
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//
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// We want to consistently return the same value, regardless of the order of
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// these properties, so let's use binary maths to assign each property to a
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// bit, and then add those together (with an offset to account for the
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// booleans at the beginning of this function).
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const capture = normalizedEventOptions.capture << 0;
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const passive = normalizedEventOptions.passive << 1;
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const once = normalizedEventOptions.once << 2;
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return capture + passive + once;
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}
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