29 lines
753 B
JavaScript
29 lines
753 B
JavaScript
import { memoize } from 'lodash';
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import { uuids } from './uuids';
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export const create = memoize((options = {}) => {
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const id = uuids()[0];
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return {
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id,
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observer: new IntersectionObserver((entries) => {
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entries.forEach((entry) => {
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entry.target.dispatchEvent(
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new CustomEvent(`IntersectionUpdate`, { detail: { entry, observer: id } }),
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);
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if (entry.isIntersecting) {
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entry.target.dispatchEvent(
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new CustomEvent(`IntersectionAppear`, { detail: { observer: id } }),
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);
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} else {
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entry.target.dispatchEvent(
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new CustomEvent(`IntersectionDisappear`, { detail: { observer: id } }),
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);
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}
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});
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}, options),
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};
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});
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