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node_modules/framer-motion/dist/es/motion/features/viewport/index.mjs

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+import { Feature } from '../Feature.mjs';
+import { observeIntersection } from './observers.mjs';
+
+const thresholdNames = {
+    some: 0,
+    all: 1,
+};
+class InViewFeature extends Feature {
+    constructor() {
+        super(...arguments);
+        this.hasEnteredView = false;
+        this.isInView = false;
+    }
+    startObserver() {
+        this.unmount();
+        const { viewport = {} } = this.node.getProps();
+        const { root, margin: rootMargin, amount = "some", once } = viewport;
+        const options = {
+            root: root ? root.current : undefined,
+            rootMargin,
+            threshold: typeof amount === "number" ? amount : thresholdNames[amount],
+        };
+        const onIntersectionUpdate = (entry) => {
+            const { isIntersecting } = entry;
+            /**
+             * If there's been no change in the viewport state, early return.
+             */
+            if (this.isInView === isIntersecting)
+                return;
+            this.isInView = isIntersecting;
+            /**
+             * Handle hasEnteredView. If this is only meant to run once, and
+             * element isn't visible, early return. Otherwise set hasEnteredView to true.
+             */
+            if (once && !isIntersecting && this.hasEnteredView) {
+                return;
+            }
+            else if (isIntersecting) {
+                this.hasEnteredView = true;
+            }
+            if (this.node.animationState) {
+                this.node.animationState.setActive("whileInView", isIntersecting);
+            }
+            /**
+             * Use the latest committed props rather than the ones in scope
+             * when this observer is created
+             */
+            const { onViewportEnter, onViewportLeave } = this.node.getProps();
+            const callback = isIntersecting ? onViewportEnter : onViewportLeave;
+            callback && callback(entry);
+        };
+        return observeIntersection(this.node.current, options, onIntersectionUpdate);
+    }
+    mount() {
+        this.startObserver();
+    }
+    update() {
+        if (typeof IntersectionObserver === "undefined")
+            return;
+        const { props, prevProps } = this.node;
+        const hasOptionsChanged = ["amount", "margin", "root"].some(hasViewportOptionChanged(props, prevProps));
+        if (hasOptionsChanged) {
+            this.startObserver();
+        }
+    }
+    unmount() { }
+}
+function hasViewportOptionChanged({ viewport = {} }, { viewport: prevViewport = {} } = {}) {
+    return (name) => viewport[name] !== prevViewport[name];
+}
+
+export { InViewFeature };

node_modules/framer-motion/dist/es/motion/features/viewport/observers.mjs

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+/**
+ * Map an IntersectionHandler callback to an element. We only ever make one handler for one
+ * element, so even though these handlers might all be triggered by different
+ * observers, we can keep them in the same map.
+ */
+const observerCallbacks = new WeakMap();
+/**
+ * Multiple observers can be created for multiple element/document roots. Each with
+ * different settings. So here we store dictionaries of observers to each root,
+ * using serialised settings (threshold/margin) as lookup keys.
+ */
+const observers = new WeakMap();
+const fireObserverCallback = (entry) => {
+    const callback = observerCallbacks.get(entry.target);
+    callback && callback(entry);
+};
+const fireAllObserverCallbacks = (entries) => {
+    entries.forEach(fireObserverCallback);
+};
+function initIntersectionObserver({ root, ...options }) {
+    const lookupRoot = root || document;
+    /**
+     * If we don't have an observer lookup map for this root, create one.
+     */
+    if (!observers.has(lookupRoot)) {
+        observers.set(lookupRoot, {});
+    }
+    const rootObservers = observers.get(lookupRoot);
+    const key = JSON.stringify(options);
+    /**
+     * If we don't have an observer for this combination of root and settings,
+     * create one.
+     */
+    if (!rootObservers[key]) {
+        rootObservers[key] = new IntersectionObserver(fireAllObserverCallbacks, { root, ...options });
+    }
+    return rootObservers[key];
+}
+function observeIntersection(element, options, callback) {
+    const rootInteresectionObserver = initIntersectionObserver(options);
+    observerCallbacks.set(element, callback);
+    rootInteresectionObserver.observe(element);
+    return () => {
+        observerCallbacks.delete(element);
+        rootInteresectionObserver.unobserve(element);
+    };
+}
+
+export { observeIntersection };