first commit

node_modules/motion-dom/dist/es/view/index.mjs

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+import { noop } from 'motion-utils';
+import { addToQueue } from './queue.mjs';
+
+class ViewTransitionBuilder {
+    constructor(update, options = {}) {
+        this.currentSubject = "root";
+        this.targets = new Map();
+        this.notifyReady = noop;
+        this.readyPromise = new Promise((resolve) => {
+            this.notifyReady = resolve;
+        });
+        this.update = update;
+        this.options = {
+            interrupt: "wait",
+            ...options,
+        };
+        addToQueue(this);
+    }
+    get(subject) {
+        this.currentSubject = subject;
+        return this;
+    }
+    layout(keyframes, options) {
+        this.updateTarget("layout", keyframes, options);
+        return this;
+    }
+    new(keyframes, options) {
+        this.updateTarget("new", keyframes, options);
+        return this;
+    }
+    old(keyframes, options) {
+        this.updateTarget("old", keyframes, options);
+        return this;
+    }
+    enter(keyframes, options) {
+        this.updateTarget("enter", keyframes, options);
+        return this;
+    }
+    exit(keyframes, options) {
+        this.updateTarget("exit", keyframes, options);
+        return this;
+    }
+    crossfade(options) {
+        this.updateTarget("enter", { opacity: 1 }, options);
+        this.updateTarget("exit", { opacity: 0 }, options);
+        return this;
+    }
+    updateTarget(target, keyframes, options = {}) {
+        const { currentSubject, targets } = this;
+        if (!targets.has(currentSubject)) {
+            targets.set(currentSubject, {});
+        }
+        const targetData = targets.get(currentSubject);
+        targetData[target] = { keyframes, options };
+    }
+    then(resolve, reject) {
+        return this.readyPromise.then(resolve, reject);
+    }
+}
+function animateView(update, defaultOptions = {}) {
+    return new ViewTransitionBuilder(update, defaultOptions);
+}
+
+export { ViewTransitionBuilder, animateView };

node_modules/motion-dom/dist/es/view/queue.mjs

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+import { removeItem } from 'motion-utils';
+import { microtask } from '../frameloop/microtask.mjs';
+import { startViewAnimation } from './start.mjs';
+
+let builders = [];
+let current = null;
+function next() {
+    current = null;
+    const [nextBuilder] = builders;
+    if (nextBuilder)
+        start(nextBuilder);
+}
+function start(builder) {
+    removeItem(builders, builder);
+    current = builder;
+    startViewAnimation(builder).then((animation) => {
+        builder.notifyReady(animation);
+        animation.finished.finally(next);
+    });
+}
+function processQueue() {
+    /**
+     * Iterate backwards over the builders array. We can ignore the
+     * "wait" animations. If we have an interrupting animation in the
+     * queue then we need to batch all preceeding animations into it.
+     * Currently this only batches the update functions but will also
+     * need to batch the targets.
+     */
+    for (let i = builders.length - 1; i >= 0; i--) {
+        const builder = builders[i];
+        const { interrupt } = builder.options;
+        if (interrupt === "immediate") {
+            const batchedUpdates = builders.slice(0, i + 1).map((b) => b.update);
+            const remaining = builders.slice(i + 1);
+            builder.update = () => {
+                batchedUpdates.forEach((update) => update());
+            };
+            // Put the current builder at the front, followed by any "wait" builders
+            builders = [builder, ...remaining];
+            break;
+        }
+    }
+    if (!current || builders[0]?.options.interrupt === "immediate") {
+        next();
+    }
+}
+function addToQueue(builder) {
+    builders.push(builder);
+    microtask.render(processQueue);
+}
+
+export { addToQueue };

node_modules/motion-dom/dist/es/view/start.mjs

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+import { secondsToMilliseconds } from 'motion-utils';
+import { GroupAnimation } from '../animation/GroupAnimation.mjs';
+import { NativeAnimation } from '../animation/NativeAnimation.mjs';
+import { NativeAnimationWrapper } from '../animation/NativeAnimationWrapper.mjs';
+import { getValueTransition } from '../animation/utils/get-value-transition.mjs';
+import { mapEasingToNativeEasing } from '../animation/waapi/easing/map-easing.mjs';
+import { applyGeneratorOptions } from '../animation/waapi/utils/apply-generator.mjs';
+import { chooseLayerType } from './utils/choose-layer-type.mjs';
+import { css } from './utils/css.mjs';
+import { getViewAnimationLayerInfo } from './utils/get-layer-info.mjs';
+import { getViewAnimations } from './utils/get-view-animations.mjs';
+import { hasTarget } from './utils/has-target.mjs';
+
+const definitionNames = ["layout", "enter", "exit", "new", "old"];
+function startViewAnimation(builder) {
+    const { update, targets, options: defaultOptions } = builder;
+    if (!document.startViewTransition) {
+        return new Promise(async (resolve) => {
+            await update();
+            resolve(new GroupAnimation([]));
+        });
+    }
+    // TODO: Go over existing targets and ensure they all have ids
+    /**
+     * If we don't have any animations defined for the root target,
+     * remove it from being captured.
+     */
+    if (!hasTarget("root", targets)) {
+        css.set(":root", {
+            "view-transition-name": "none",
+        });
+    }
+    /**
+     * Set the timing curve to linear for all view transition layers.
+     * This gets baked into the keyframes, which can't be changed
+     * without breaking the generated animation.
+     *
+     * This allows us to set easing via updateTiming - which can be changed.
+     */
+    css.set("::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*)", { "animation-timing-function": "linear !important" });
+    css.commit(); // Write
+    const transition = document.startViewTransition(async () => {
+        await update();
+        // TODO: Go over new targets and ensure they all have ids
+    });
+    transition.finished.finally(() => {
+        css.remove(); // Write
+    });
+    return new Promise((resolve) => {
+        transition.ready.then(() => {
+            const generatedViewAnimations = getViewAnimations();
+            const animations = [];
+            /**
+             * Create animations for each of our explicitly-defined subjects.
+             */
+            targets.forEach((definition, target) => {
+                // TODO: If target is not "root", resolve elements
+                // and iterate over each
+                for (const key of definitionNames) {
+                    if (!definition[key])
+                        continue;
+                    const { keyframes, options } = definition[key];
+                    for (let [valueName, valueKeyframes] of Object.entries(keyframes)) {
+                        if (!valueKeyframes)
+                            continue;
+                        const valueOptions = {
+                            ...getValueTransition(defaultOptions, valueName),
+                            ...getValueTransition(options, valueName),
+                        };
+                        const type = chooseLayerType(key);
+                        /**
+                         * If this is an opacity animation, and keyframes are not an array,
+                         * we need to convert them into an array and set an initial value.
+                         */
+                        if (valueName === "opacity" &&
+                            !Array.isArray(valueKeyframes)) {
+                            const initialValue = type === "new" ? 0 : 1;
+                            valueKeyframes = [initialValue, valueKeyframes];
+                        }
+                        /**
+                         * Resolve stagger function if provided.
+                         */
+                        if (typeof valueOptions.delay === "function") {
+                            valueOptions.delay = valueOptions.delay(0, 1);
+                        }
+                        valueOptions.duration && (valueOptions.duration = secondsToMilliseconds(valueOptions.duration));
+                        valueOptions.delay && (valueOptions.delay = secondsToMilliseconds(valueOptions.delay));
+                        const animation = new NativeAnimation({
+                            ...valueOptions,
+                            element: document.documentElement,
+                            name: valueName,
+                            pseudoElement: `::view-transition-${type}(${target})`,
+                            keyframes: valueKeyframes,
+                        });
+                        animations.push(animation);
+                    }
+                }
+            });
+            /**
+             * Handle browser generated animations
+             */
+            for (const animation of generatedViewAnimations) {
+                if (animation.playState === "finished")
+                    continue;
+                const { effect } = animation;
+                if (!effect || !(effect instanceof KeyframeEffect))
+                    continue;
+                const { pseudoElement } = effect;
+                if (!pseudoElement)
+                    continue;
+                const name = getViewAnimationLayerInfo(pseudoElement);
+                if (!name)
+                    continue;
+                const targetDefinition = targets.get(name.layer);
+                if (!targetDefinition) {
+                    /**
+                     * If transition name is group then update the timing of the animation
+                     * whereas if it's old or new then we could possibly replace it using
+                     * the above method.
+                     */
+                    const transitionName = name.type === "group" ? "layout" : "";
+                    let animationTransition = {
+                        ...getValueTransition(defaultOptions, transitionName),
+                    };
+                    animationTransition.duration && (animationTransition.duration = secondsToMilliseconds(animationTransition.duration));
+                    animationTransition =
+                        applyGeneratorOptions(animationTransition);
+                    const easing = mapEasingToNativeEasing(animationTransition.ease, animationTransition.duration);
+                    effect.updateTiming({
+                        delay: secondsToMilliseconds(animationTransition.delay ?? 0),
+                        duration: animationTransition.duration,
+                        easing,
+                    });
+                    animations.push(new NativeAnimationWrapper(animation));
+                }
+                else if (hasOpacity(targetDefinition, "enter") &&
+                    hasOpacity(targetDefinition, "exit") &&
+                    effect
+                        .getKeyframes()
+                        .some((keyframe) => keyframe.mixBlendMode)) {
+                    animations.push(new NativeAnimationWrapper(animation));
+                }
+                else {
+                    animation.cancel();
+                }
+            }
+            resolve(new GroupAnimation(animations));
+        });
+    });
+}
+function hasOpacity(target, key) {
+    return target?.[key]?.keyframes.opacity;
+}
+
+export { startViewAnimation };

node_modules/motion-dom/dist/es/view/utils/choose-layer-type.mjs

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+function chooseLayerType(valueName) {
+    if (valueName === "layout")
+        return "group";
+    if (valueName === "enter" || valueName === "new")
+        return "new";
+    if (valueName === "exit" || valueName === "old")
+        return "old";
+    return "group";
+}
+
+export { chooseLayerType };

node_modules/motion-dom/dist/es/view/utils/css.mjs

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+let pendingRules = {};
+let style = null;
+const css = {
+    set: (selector, values) => {
+        pendingRules[selector] = values;
+    },
+    commit: () => {
+        if (!style) {
+            style = document.createElement("style");
+            style.id = "motion-view";
+        }
+        let cssText = "";
+        for (const selector in pendingRules) {
+            const rule = pendingRules[selector];
+            cssText += `${selector} {\n`;
+            for (const [property, value] of Object.entries(rule)) {
+                cssText += `  ${property}: ${value};\n`;
+            }
+            cssText += "}\n";
+        }
+        style.textContent = cssText;
+        document.head.appendChild(style);
+        pendingRules = {};
+    },
+    remove: () => {
+        if (style && style.parentElement) {
+            style.parentElement.removeChild(style);
+        }
+    },
+};
+
+export { css };

node_modules/motion-dom/dist/es/view/utils/get-layer-info.mjs

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+function getViewAnimationLayerInfo(pseudoElement) {
+    const match = pseudoElement.match(/::view-transition-(old|new|group|image-pair)\((.*?)\)/);
+    if (!match)
+        return null;
+    return { layer: match[2], type: match[1] };
+}
+
+export { getViewAnimationLayerInfo };

node_modules/motion-dom/dist/es/view/utils/get-view-animations.mjs

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+function filterViewAnimations(animation) {
+    const { effect } = animation;
+    if (!effect)
+        return false;
+    return (effect.target === document.documentElement &&
+        effect.pseudoElement?.startsWith("::view-transition"));
+}
+function getViewAnimations() {
+    return document.getAnimations().filter(filterViewAnimations);
+}
+
+export { getViewAnimations };

node_modules/motion-dom/dist/es/view/utils/has-target.mjs

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+function hasTarget(target, targets) {
+    return targets.has(target) && Object.keys(targets.get(target)).length > 0;
+}
+
+export { hasTarget };