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Copy pathcommon.js
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!function(){"use strict";function t(t){this.time=t.time,this.target=t.target,this.rootBounds=t.rootBounds,this.boundingClientRect=t.boundingClientRect,this.intersectionRect=t.intersectionRect||c(),this.isIntersecting=!!t.intersectionRect;var e=this.boundingClientRect,n=e.width*e.height,o=this.intersectionRect,i=o.width*o.height;this.intersectionRatio=n?Number((i/n).toFixed(4)):this.isIntersecting?1:0}function e(t,e){var n=e||{};if("function"!=typeof t)throw new Error("callback must be a function");if(n.root&&1!=n.root.nodeType)throw new Error("root must be an Element");this._checkForIntersections=o(this._checkForIntersections.bind(this),this.THROTTLE_TIMEOUT),this._callback=t,this._observationTargets=[],this._queuedEntries=[],this._rootMarginValues=this._parseRootMargin(n.rootMargin),this.thresholds=this._initThresholds(n.threshold),this.root=n.root||null,this.rootMargin=this._rootMarginValues.map(function(t){return t.value+t.unit}).join(" ")}function n(){return 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