withastro · natemoo-re · Aug 24, 2023 · Aug 23, 2023 · Aug 23, 2023 · Aug 23, 2023
diff --git a/.changeset/five-geese-crash.md b/.changeset/five-geese-crash.md
@@ -0,0 +1,11 @@
+---
+'astro': major
+---
+
+Change the [View Transition built-in animation](https://docs.astro.build/en/guides/view-transitions/#built-in-animation-directives) options.
+
+The `transition:animate` value `morph` has been renamed to `initial`. Also, this is no longer the default animation.
+
+If no `transition:animate` directive is specified, your animations will now default to `fade`.
+
+Astro also supports a new `transition:animate` value, `none`. This value can be used on a page's `<html>` element to disable animated full-page transitions on an entire page.
diff --git a/packages/astro/e2e/fixtures/view-transitions/src/components/Layout.astro b/packages/astro/e2e/fixtures/view-transitions/src/components/Layout.astro
@@ -32,7 +32,7 @@ const { link } = Astro.props as Props;
 		</script>
 	</head>
 	<body>
-		<header transition:animate="morph">
+		<header transition:animate="initial">
 			<h1>testing</h1>
 		</header>
 		<main transition:animate="slide">

diff --git a/packages/astro/package.json b/packages/astro/package.json
@@ -119,7 +119,7 @@
     "test:e2e:match": "playwright test -g"
   },
   "dependencies": {
-    "@astrojs/compiler": "^2.0.0",
+    "@astrojs/compiler": "^2.0.1",
     "@astrojs/internal-helpers": "workspace:*",
     "@astrojs/markdown-remark": "workspace:*",
     "@astrojs/telemetry": "workspace:*",

diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
@@ -77,7 +77,7 @@ export interface TransitionDirectionalAnimations {
 	backwards: TransitionAnimationPair;
 }
 
-export type TransitionAnimationValue = 'morph' | 'slide' | 'fade' | TransitionDirectionalAnimations;
+export type TransitionAnimationValue = 'initial' | 'slide' | 'fade' | 'none' | TransitionDirectionalAnimations;
 
 // Allow users to extend this for astro-jsx.d.ts
 // eslint-disable-next-line @typescript-eslint/no-empty-interface
@@ -93,7 +93,7 @@ export interface AstroBuiltinAttributes {
 	'set:html'?: any;
 	'set:text'?: any;
 	'is:raw'?: boolean;
-	'transition:animate'?: 'morph' | 'slide' | 'fade' | TransitionDirectionalAnimations;
+	'transition:animate'?: TransitionAnimationValue;
 	'transition:name'?: string;
 	'transition:persist'?: boolean | string;
 }

diff --git a/packages/astro/src/core/compile/compile.ts b/packages/astro/src/core/compile/compile.ts
@@ -45,8 +45,6 @@ export async function compile({
 			astroGlobalArgs: JSON.stringify(astroConfig.site),
 			scopedStyleStrategy: astroConfig.scopedStyleStrategy,
 			resultScopedSlot: true,
-			experimentalTransitions: astroConfig.experimental.viewTransitions,
-			experimentalPersistence: astroConfig.experimental.viewTransitions,
 			transitionsAnimationURL: 'astro/components/viewtransitions.css',
 			preprocessStyle: createStylePreprocessor({
 				filename,

diff --git a/packages/astro/src/runtime/server/transition.ts b/packages/astro/src/runtime/server/transition.ts
@@ -2,7 +2,6 @@ import type {
 	SSRResult,
 	TransitionAnimation,
 	TransitionAnimationValue,
-	TransitionDirectionalAnimations,
 } from '../../@types/astro';
 import { fade, slide } from '../../transitions/index.js';
 import { markHTMLString } from './escape.js';
@@ -22,78 +21,80 @@ export function createTransitionScope(result: SSRResult, hash: string) {
 	return `astro-${hash}-${num}`;
 }
 
+// Ensure animationName is a valid CSS identifier
+function toValidIdent(name: string): string {
+	return name.replace(/[^a-zA-Z0-9\-\_]/g, '_').replace(/^\_+|\_+$/g, '')
+}
+
+type Entries<T extends Record<string, any>> = Iterable<[keyof T, T[keyof T]]>
+
+const getAnimations = (name: TransitionAnimationValue) => {
+	if (name === 'fade') return fade();
+	if (name === 'slide') return slide();
+	if (typeof name === 'object') return name;
+}
+
 export function renderTransition(
 	result: SSRResult,
 	hash: string,
 	animationName: TransitionAnimationValue | undefined,
 	transitionName: string
 ) {
-	let animations: TransitionDirectionalAnimations | null = null;
-	switch (animationName) {
-		case 'fade': {
-			animations = fade();
-			break;
-		}
-		case 'slide': {
-			animations = slide();
-			break;
-		}
-		default: {
-			if (typeof animationName === 'object') {
-				animations = animationName;
+	// Default to `fade` (similar to `initial`, but snappier)
+	if (!animationName) animationName = 'fade';
+	const scope = createTransitionScope(result, hash);
+	const name = transitionName ? toValidIdent(transitionName) : scope;
+	const sheet = new ViewTransitionStyleSheet(scope, name);
+
+	const animations = getAnimations(animationName);
+	if (animations) {
+		for (const [direction, images] of Object.entries(animations) as Entries<typeof animations>) {
+			for (const [image, rules] of Object.entries(images) as Entries<typeof animations[typeof direction]>) {
+				sheet.addAnimationPair(direction, image, rules);
 			}
 		}
+	} else if (animationName === 'none') {
+		sheet.addAnimationRaw('old', 'animation: none; opacity: 0; mix-blend-mode: normal;')
+		sheet.addAnimationRaw('new', 'animation: none; mix-blend-mode: normal;')
 	}
 
-	const scope = createTransitionScope(result, hash);
+	result._metadata.extraHead.push(markHTMLString(`<style>${sheet.toString()}</style>`));
+	return scope;
+}
 
-	// Default transition name is the scope of the element, ie HASH-1
-	if (!transitionName) {
-		transitionName = scope;
-	}
+class ViewTransitionStyleSheet {
+	private modern: string[] = []
+	private fallback: string[] = []
 
-	const styles = markHTMLString(`<style>[data-astro-transition-scope="${scope}"] {
-	view-transition-name: ${transitionName};
-}
-	${
-		!animations
-			? ``
-			: // Regular animations
-			  `
-::view-transition-old(${transitionName}) {
-	${stringifyAnimation(animations.forwards.old)}
-}
-[data-astro-transition-fallback=old] [data-astro-transition-scope="${scope}"] {
-	${stringifyAnimation(animations.forwards.old)}
-}
+	constructor(private scope: string, private name: string) {}
 
-::view-transition-new(${transitionName}) {
-	${stringifyAnimation(animations.forwards.new)}
-}
-[data-astro-transition-fallback=new] [data-astro-transition-scope="${scope}"] {
-	${stringifyAnimation(animations.forwards.new)}
-}
+	toString() {
+		const { scope, name } = this;
+		const [modern, fallback] = [this.modern, this.fallback].map(rules => rules.join(''));
+		return [`[data-astro-transition-scope="${scope}"] { view-transition-name: ${name}; }`, this.layer(modern), fallback].join('')
+	}
 
-[data-astro-transition=back]::view-transition-old(${transitionName}) {
-	${stringifyAnimation(animations.backwards.old)}
-}
-[data-astro-transition=back][data-astro-transition-fallback=old] [data-astro-transition-scope="${scope}"] {
-	${stringifyAnimation(animations.backwards.old)}
-}
+	private layer(cssText: string) {
+		return cssText ? `@layer astro { ${cssText} }` : '';
+	}
 
-[data-astro-transition=back]::view-transition-new(${transitionName}) {
-	${stringifyAnimation(animations.backwards.new)}
-}
-[data-astro-transition=back][data-astro-transition-fallback=new] [data-astro-transition-scope="${scope}"] {
-	${stringifyAnimation(animations.backwards.new)}
-}
-	`.trim()
+	private addRule(target: 'modern' | 'fallback', cssText: string) {
+		this[target].push(cssText);
 	}
-	</style>`);
 
-	result._metadata.extraHead.push(styles);
+	addAnimationRaw(image: 'old' | 'new' | 'group', animation: string) {
+		const { scope, name } = this;
+		this.addRule('modern', `::view-transition-${image}(${name}) { ${animation} }`)
+		this.addRule('fallback', `[data-astro-transition-fallback="${image}"] [data-astro-transition-scope="${scope}"] { ${animation} }`)
+	}
 
-	return scope;
+	addAnimationPair(direction: 'forwards' | 'backwards', image: 'old' | 'new', rules: TransitionAnimation | TransitionAnimation[]) {
+		const { scope, name } = this;
+		const animation = stringifyAnimation(rules);
+		const prefix = direction === 'backwards' ? `[data-astro-transition=back]` : '';
+		this.addRule('modern', `${prefix}::view-transition-${image}(${name}) { ${animation} }`)
+		this.addRule('fallback', `${prefix}[data-astro-transition-fallback="${image}"] [data-astro-transition-scope="${scope}"] { ${animation} }`)
+	}
 }
 
 type AnimationBuilder = {
@@ -137,7 +138,6 @@ function stringifyAnimations(anims: TransitionAnimation[]): string {
 	const builder = animationBuilder();
 
 	for (const anim of anims) {
-		/*300ms cubic-bezier(0.4, 0, 0.2, 1) both astroSlideFromRight;*/
 		if (anim.duration) {
 			addAnimationProperty(builder, 'animation-duration', toTimeValue(anim.duration));
 		}

diff --git a/packages/astro/src/transitions/index.ts b/packages/astro/src/transitions/index.ts
@@ -1,5 +1,7 @@
 import type { TransitionAnimationPair, TransitionDirectionalAnimations } from '../@types/astro';
 
+const EASE_IN_OUT_QUART = 'cubic-bezier(0.76, 0, 0.24, 1)';
+
 export function slide({
 	duration,
 }: {
@@ -11,28 +13,28 @@ export function slide({
 				{
 					name: 'astroFadeOut',
 					duration: duration ?? '90ms',
-					easing: 'cubic-bezier(0.4, 0, 1, 1)',
+					easing: EASE_IN_OUT_QUART,
 					fillMode: 'both',
 				},
 				{
 					name: 'astroSlideToLeft',
-					duration: duration ?? '300ms',
-					easing: 'cubic-bezier(0.4, 0, 0.2, 1)',
+					duration: duration ?? '220ms',
+					easing: EASE_IN_OUT_QUART,
 					fillMode: 'both',
 				},
 			],
 			new: [
 				{
 					name: 'astroFadeIn',
 					duration: duration ?? '210ms',
-					easing: 'cubic-bezier(0, 0, 0.2, 1)',
-					delay: '90ms',
+					easing: EASE_IN_OUT_QUART,
+					delay: duration ? undefined : '30ms',
 					fillMode: 'both',
 				},
 				{
 					name: 'astroSlideFromRight',
-					duration: duration ?? '300ms',
-					easing: 'cubic-bezier(0.4, 0, 0.2, 1)',
+					duration: duration ?? '220ms',
+					easing: EASE_IN_OUT_QUART,
 					fillMode: 'both',
 				},
 			],
@@ -45,22 +47,22 @@ export function slide({
 }
 
 export function fade({
-	duration,
+	duration
 }: {
 	duration?: string | number;
 } = {}): TransitionDirectionalAnimations {
 	const anim = {
 		old: {
-			name: 'astroFadeInOut',
-			duration: duration ?? '0.2s',
-			easing: 'linear',
-			fillMode: 'forwards',
+			name: 'astroFadeOut',
+			duration: duration ?? 180,
+			easing: EASE_IN_OUT_QUART,
+			fillMode: 'both',
 		},
 		new: {
-			name: 'astroFadeInOut',
-			duration: duration ?? '0.3s',
-			easing: 'linear',
-			fillMode: 'backwards',
+			name: 'astroFadeIn',
+			duration: duration ?? 180,
+			easing: EASE_IN_OUT_QUART,
+			fillMode: 'both',
 		},
 	} satisfies TransitionAnimationPair;
 

diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml