chore: ci

.changeset/grumpy-chairs-leave.md

@@ -0,0 +1,9 @@
+---
+'astro': major
+---
+
+Adjust `astro-island` serialization approach.
+
+Previously, Astro had custom serialization logic that created a large HTML attribute and came with a deserialization cost on the client. Now, component props are serialized using [`seroval`](https://github.com/lxsmnsyc/seroval) and injected as a `<script>`.
+
+This should significantly reduce the size and runtime cost of large data objects.

packages/astro/e2e/error-cyclic.test.js

@@ -1,26 +0,0 @@
-import { expect } from '@playwright/test';
-import { testFactory, getErrorOverlayContent } from './test-utils.js';
-
-const test = testFactory({
-	root: './fixtures/error-cyclic/',
-});
-
-let devServer;
-
-test.beforeEach(async ({ astro }) => {
-	devServer = await astro.startDevServer();
-});
-
-test.afterEach(async ({ astro }) => {
-	await devServer.stop();
-	astro.resetAllFiles();
-});
-
-test.describe('Error: Cyclic Reference', () => {
-	test('overlay', async ({ page, astro }) => {
-		await page.goto(astro.resolveUrl('/'));
-
-		const message = (await getErrorOverlayContent(page)).message;
-		expect(message).toMatch('Cyclic reference');
-	});
-});

packages/astro/package.json

@@ -160,6 +160,7 @@
     "prompts": "^2.4.2",
     "rehype": "^12.0.1",
     "semver": "^7.5.3",
+    "seroval": "^0.9.0",
     "server-destroy": "^1.0.1",
     "sharp": "^0.32.1",
     "shiki": "^0.14.1",

packages/astro/src/runtime/server/astro-island.ts

@@ -10,39 +10,27 @@ declare const Astro: {
 		opts: Record<string, any>,
 		root: HTMLElement
 	) => void;
-};
+}
+
+interface IslandMeta {
+	componentUrl: string;
+	rendererUrl: string;
+	beforeHydrationUrl?: string;
+	componentExport?: string;
+	props: Record<string, any>;
+	opts: Record<string, any>;
+}
 
 {
-	interface PropTypeSelector {
-		[k: string]: (value: any) => any;
-	}
-
-	const propTypes: PropTypeSelector = {
-		0: (value) => reviveObject(value),
-		1: (value) => reviveArray(value),
-		2: (value) => new RegExp(value),
-		3: (value) => new Date(value),
-		4: (value) => new Map(reviveArray(value)),
-		5: (value) => new Set(reviveArray(value)),
-		6: (value) => BigInt(value),
-		7: (value) => new URL(value),
-		8: (value) => new Uint8Array(value),
-		9: (value) => new Uint16Array(value),
-		10: (value) => new Uint32Array(value),
-	};
-
-	// Not using JSON.parse reviver because it's bottom-up but we want top-down
-	const reviveTuple = (raw: any): any => {
-		const [type, value] = raw;
-		return type in propTypes ? propTypes[type](value) : undefined;
-	};
-
-	const reviveArray = (raw: any): any => (raw as Array<any>).map(reviveTuple);
-
-	const reviveObject = (raw: any): any => {
-		if (typeof raw !== 'object' || raw === null) return raw;
-		return Object.fromEntries(Object.entries(raw).map(([key, value]) => [key, reviveTuple(value)]));
-	};
+	// island meta info (for all islands) is stored here
+	let $meta: Record<string, IslandMeta> = {};
+	// Astro.assign is called in injected scripts
+	(self as any).Astro = Object.assign((self as any).Astro || {}, {
+		assign(script: HTMLElement, value: any) {
+			$meta[(script.parentElement as any).getAttribute('uid')] = value;
+			script.remove();
+		}
+	})
 
 	if (!customElements.get('astro-island')) {
 		customElements.define(
@@ -50,8 +38,11 @@ declare const Astro: {
 			class extends HTMLElement {
 				public Component: any;
 				public hydrator: any;
-				static observedAttributes = ['props'];
+				public uid: any;
+				static get observedAttributes() { return ['ssr'] }
+				get meta() { return $meta[this.uid]; }
 				connectedCallback() {
+					this.uid = this.getAttribute('uid')!;
 					if (!this.hasAttribute('await-children') || this.firstChild) {
 						this.childrenConnectedCallback();
 					} else {
@@ -66,27 +57,27 @@ declare const Astro: {
 					}
 				}
 				async childrenConnectedCallback() {
-					let beforeHydrationUrl = this.getAttribute('before-hydration-url');
+					let { beforeHydrationUrl } = this.meta;
 					if (beforeHydrationUrl) {
 						await import(beforeHydrationUrl);
 					}
 					this.start();
+					this.removeAttribute('await-children');
 				}
 				start() {
-					const opts = JSON.parse(this.getAttribute('opts')!) as Record<string, any>;
-					const directive = this.getAttribute('client') as directiveAstroKeys;
-					if (Astro[directive] === undefined) {
-						window.addEventListener(`astro:${directive}`, () => this.start(), { once: true });
+					const { opts = {} } = this.meta;
+					const client = this.getAttribute('client') as directiveAstroKeys;
+					if (Astro[client] === undefined) {
+						window.addEventListener(`astro:${client}`, () => this.start(), { once: true });
 						return;
 					}
-					Astro[directive]!(
+					Astro[client]!(
 						async () => {
-							const rendererUrl = this.getAttribute('renderer-url');
+							const { rendererUrl, componentUrl, componentExport = 'default' } = this.meta;
 							const [componentModule, { default: hydrator }] = await Promise.all([
-								import(this.getAttribute('component-url')!),
+								import(componentUrl),
 								rendererUrl ? import(rendererUrl) : () => () => {},
 							]);
-							const componentExport = this.getAttribute('component-export') || 'default';
 							if (!componentExport.includes('.')) {
 								this.Component = componentModule[componentExport];
 							} else {
@@ -134,29 +125,7 @@ declare const Astro: {
 						if (!closest?.isSameNode(this)) continue;
 						slots[slot.getAttribute('name') || 'default'] = slot.innerHTML;
 					}
-
-					let props: Record<string, unknown>;
-
-					try {
-						props = this.hasAttribute('props')
-							? reviveObject(JSON.parse(this.getAttribute('props')!))
-							: {};
-					} catch (e) {
-						let componentName: string = this.getAttribute('component-url') || '<unknown>';
-						const componentExport = this.getAttribute('component-export');
-
-						if (componentExport) {
-							componentName += ` (export ${componentExport})`;
-						}
-
-						// eslint-disable-next-line no-console
-						console.error(
-							`[hydrate] Error parsing props for component ${componentName}`,
-							this.getAttribute('props'),
-							e
-						);
-						throw e;
-					}
+					const { props = {} } = this.meta;
 					await this.hydrator(this)(this.Component, props, slots, {
 						client: this.getAttribute('client'),
 					});

packages/astro/src/runtime/server/hydration.ts

@@ -4,9 +4,10 @@ import type {
 	SSRLoadedRenderer,
 	SSRResult,
 } from '../../@types/astro';
+
+import { serialize } from 'seroval';
 import { AstroError, AstroErrorData } from '../../core/errors/index.js';
 import { escapeHTML } from './escape.js';
-import { serializeProps } from './serialize.js';
 import { serializeListValue } from './util.js';
 
 export interface HydrationMetadata {
@@ -123,7 +124,7 @@ interface HydrateScriptOptions {
 export async function generateHydrateScript(
 	scriptOptions: HydrateScriptOptions,
 	metadata: Required<AstroComponentMetadata>
-): Promise<SSRElement> {
+): Promise<[SSRElement, SSRElement]> {
 	const { renderer, result, astroId, props, attrs } = scriptOptions;
 	const { hydrate, componentUrl, componentExport } = metadata;
 
@@ -140,6 +141,7 @@ export async function generateHydrateScript(
 			uid: astroId,
 		},
 	};
+	const scriptProps: Record<string, any> = {}
 
 	// Attach renderer-provided attributes
 	if (attrs) {
@@ -149,27 +151,31 @@ export async function generateHydrateScript(
 	}
 
 	// Add component url
-	island.props['component-url'] = await result.resolve(decodeURI(componentUrl));
+	scriptProps['componentUrl'] = await result.resolve(decodeURI(componentUrl));
 
 	// Add renderer url
 	if (renderer.clientEntrypoint) {
-		island.props['component-export'] = componentExport.value;
-		island.props['renderer-url'] = await result.resolve(decodeURI(renderer.clientEntrypoint));
-		island.props['props'] = escapeHTML(serializeProps(props, metadata));
+		if (componentExport.value !== 'default') scriptProps['componentExport'] = componentExport.value;
+		scriptProps['rendererUrl'] = await result.resolve(decodeURI(renderer.clientEntrypoint));
 	}
 
 	island.props['ssr'] = '';
 	island.props['client'] = hydrate;
 	let beforeHydrationUrl = await result.resolve('astro:scripts/before-hydration.js');
 	if (beforeHydrationUrl.length) {
-		island.props['before-hydration-url'] = beforeHydrationUrl;
+		scriptProps['beforeHydrationUrl'] = beforeHydrationUrl;
+	}
+	scriptProps['opts'] = {};
+	if (metadata.displayName) {
+		scriptProps.opts.name = metadata.displayName;
+	}
+	if (metadata.hydrateArgs !== true) {
+		scriptProps.opts.value = metadata.hydrateArgs;
+	}
+	if (Object.keys(scriptProps.opts).length === 0) delete scriptProps.opts;
+	if (typeof props === 'object' && Object.keys(props).length > 0) {
+		scriptProps['props'] = props;
 	}
-	island.props['opts'] = escapeHTML(
-		JSON.stringify({
-			name: metadata.displayName,
-			value: metadata.hydrateArgs || '',
-		})
-	);
 
 	transitionDirectivesToCopyOnIsland.forEach((name) => {
 		if (props[name]) {
@@ -177,5 +183,11 @@ export async function generateHydrateScript(
 		}
 	});
 
-	return island;
+	const serializedProps = serialize(scriptProps)
+	const script: SSRElement = {
+		children: `Astro.assign(document.currentScript,${serializedProps})`,
+		props: {}
+	}
+
+	return [island, script];
 }

packages/astro/src/runtime/server/jsx.ts

@@ -50,9 +50,11 @@ export async function renderJSX(result: SSRResult, vnode: any): Promise<any> {
 		case !vnode && vnode !== 0:
 			return '';
 		case Array.isArray(vnode):
-			return markHTMLString(
-				(await Promise.all(vnode.map((v: any) => renderJSX(result, v)))).join('')
-			);
+			let dest = '';
+			for (const child of vnode) {
+				dest += await renderJSX(result, child);
+			}
+			return markHTMLString(dest);
 	}
 
 	// Extract the skip from the props, if we've already attempted a previous render

packages/astro/src/runtime/server/render/component.ts

@@ -6,10 +6,10 @@ import type {
 } from '../../../@types/astro';
 import type { RenderInstruction } from './types.js';
 
+import { serialize } from 'seroval';
 import { AstroError, AstroErrorData } from '../../../core/errors/index.js';
 import { HTMLBytes, markHTMLString } from '../escape.js';
 import { extractDirectives, generateHydrateScript } from '../hydration.js';
-import { serializeProps } from '../serialize.js';
 import { shorthash } from '../shorthash.js';
 import { isPromise } from '../util.js';
 import {
@@ -89,7 +89,7 @@ async function renderFrameworkComponent(
 	const { renderers, clientDirectives } = result;
 	const metadata: AstroComponentMetadata = {
 		astroStaticSlot: true,
-		displayName,
+		displayName: typeof displayName === 'string' ? displayName : '',
 	};
 
 	const { hydration, isPage, props } = extractDirectives(_props, clientDirectives);
@@ -314,13 +314,10 @@ If you're still stuck, please open an issue on GitHub or join us at https://astr
 
 	// Include componentExport name, componentUrl, and props in hash to dedupe identical islands
 	const astroId = shorthash(
-		`<!--${metadata.componentExport!.value}:${metadata.componentUrl}-->\n${html}\n${serializeProps(
-			props,
-			metadata
-		)}`
+		`<!--${metadata.componentExport!.value}:${metadata.componentUrl}-->\n${html}\n${serialize(props)}`
 	);
 
-	const island = await generateHydrateScript(
+	const [island, script] = await generateHydrateScript(
 		{ renderer: renderer!, result, astroId, props, attrs },
 		metadata as Required<AstroComponentMetadata>
 	);
@@ -357,10 +354,10 @@ If you're still stuck, please open an issue on GitHub or join us at https://astr
 			: '';
 
 	island.children = `${html ?? ''}${template}`;
-
 	if (island.children) {
 		island.props['await-children'] = '';
 	}
+	island.children = `${renderElement('script', script, false)}${island.children}`
 
 	return {
 		render(destination) {

packages/astro/src/runtime/server/serialize.ts

@@ -1,109 +0,0 @@
-import type { AstroComponentMetadata } from '../../@types/astro';
-
-type ValueOf<T> = T[keyof T];
-
-const PROP_TYPE = {
-	Value: 0,
-	JSON: 1, // Actually means Array
-	RegExp: 2,
-	Date: 3,
-	Map: 4,
-	Set: 5,
-	BigInt: 6,
-	URL: 7,
-	Uint8Array: 8,
-	Uint16Array: 9,
-	Uint32Array: 10,
-};
-
-function serializeArray(
-	value: any[],
-	metadata: AstroComponentMetadata | Record<string, any> = {},
-	parents = new WeakSet<any>()
-): any[] {
-	if (parents.has(value)) {
-		throw new Error(`Cyclic reference detected while serializing props for <${metadata.displayName} client:${metadata.hydrate}>!
-
-Cyclic references cannot be safely serialized for client-side usage. Please remove the cyclic reference.`);
-	}
-	parents.add(value);
-	const serialized = value.map((v) => {
-		return convertToSerializedForm(v, metadata, parents);
-	});
-	parents.delete(value);
-	return serialized;
-}
-
-function serializeObject(
-	value: Record<any, any>,
-	metadata: AstroComponentMetadata | Record<string, any> = {},
-	parents = new WeakSet<any>()
-): Record<any, any> {
-	if (parents.has(value)) {
-		throw new Error(`Cyclic reference detected while serializing props for <${metadata.displayName} client:${metadata.hydrate}>!
-
-Cyclic references cannot be safely serialized for client-side usage. Please remove the cyclic reference.`);
-	}
-	parents.add(value);
-	const serialized = Object.fromEntries(
-		Object.entries(value).map(([k, v]) => {
-			return [k, convertToSerializedForm(v, metadata, parents)];
-		})
-	);
-	parents.delete(value);
-	return serialized;
-}
-
-function convertToSerializedForm(
-	value: any,
-	metadata: AstroComponentMetadata | Record<string, any> = {},
-	parents = new WeakSet<any>()
-): [ValueOf<typeof PROP_TYPE>, any] | [ValueOf<typeof PROP_TYPE>] {
-	const tag = Object.prototype.toString.call(value);
-	switch (tag) {
-		case '[object Date]': {
-			return [PROP_TYPE.Date, (value as Date).toISOString()];
-		}
-		case '[object RegExp]': {
-			return [PROP_TYPE.RegExp, (value as RegExp).source];
-		}
-		case '[object Map]': {
-			return [PROP_TYPE.Map, serializeArray(Array.from(value as Map<any, any>), metadata, parents)];
-		}
-		case '[object Set]': {
-			return [PROP_TYPE.Set, serializeArray(Array.from(value as Set<any>), metadata, parents)];
-		}
-		case '[object BigInt]': {
-			return [PROP_TYPE.BigInt, (value as bigint).toString()];
-		}
-		case '[object URL]': {
-			return [PROP_TYPE.URL, (value as URL).toString()];
-		}
-		case '[object Array]': {
-			return [PROP_TYPE.JSON, serializeArray(value, metadata, parents)];
-		}
-		case '[object Uint8Array]': {
-			return [PROP_TYPE.Uint8Array, Array.from(value as Uint8Array)];
-		}
-		case '[object Uint16Array]': {
-			return [PROP_TYPE.Uint16Array, Array.from(value as Uint16Array)];
-		}
-		case '[object Uint32Array]': {
-			return [PROP_TYPE.Uint32Array, Array.from(value as Uint32Array)];
-		}
-		default: {
-			if (value !== null && typeof value === 'object') {
-				return [PROP_TYPE.Value, serializeObject(value, metadata, parents)];
-			} else if (value === undefined) {
-				return [PROP_TYPE.Value];
-			} else {
-				return [PROP_TYPE.Value, value];
-			}
-		}
-	}
-}
-
-export function serializeProps(props: any, metadata: AstroComponentMetadata) {
-	const serialized = JSON.stringify(serializeObject(props, metadata));
-	return serialized;
-}

packages/astro/test/astro-assets-prefix.test.js

@@ -1,7 +1,7 @@
 import { expect } from 'chai';
 import * as cheerio from 'cheerio';
 import testAdapter from './test-adapter.js';
-import { loadFixture } from './test-utils.js';
+import { loadFixture, getIslandDataFromScript } from './test-utils.js';
 
 const assetsPrefix = 'http://localhost:4321';
 const assetsPrefixRegex = /^http:\/\/localhost:4321\/_astro\/.*/;
@@ -36,9 +36,11 @@ describe('Assets Prefix - Static', () => {
 	it('react component astro-island should import from assetsPrefix', async () => {
 		const html = await fixture.readFile('/index.html');
 		const $ = cheerio.load(html);
-		const island = $('astro-island');
-		expect(island.attr('component-url')).to.match(assetsPrefixRegex);
-		expect(island.attr('renderer-url')).to.match(assetsPrefixRegex);
+		const script = $('astro-island > script').first();
+		const data = getIslandDataFromScript(script.text());
+
+		expect(data.componentUrl).to.match(assetsPrefixRegex);
+		expect(data.rendererUrl).to.match(assetsPrefixRegex);
 	});
 
 	it('import.meta.env.ASSETS_PREFIX works', async () => {
@@ -127,9 +129,11 @@ describe('Assets Prefix, server', () => {
 		expect(response.status).to.equal(200);
 		const html = await response.text();
 		const $ = cheerio.load(html);
-		const island = $('astro-island');
-		expect(island.attr('component-url')).to.match(assetsPrefixRegex);
-		expect(island.attr('renderer-url')).to.match(assetsPrefixRegex);
+		const script = $('astro-island > script');
+		const data = getIslandDataFromScript(script.text());
+
+		expect(data.componentUrl).to.match(assetsPrefixRegex);
+		expect(data.rendererUrl).to.match(assetsPrefixRegex);
 	});
 
 	it('markdown optimized image src does not start with assetsPrefix in SSR', async () => {

packages/astro/test/astro-children.test.js

@@ -76,7 +76,7 @@ describe('Component children', () => {
 
 		// test 2: If client, and no children are rendered, a template is.
 		expect($('#client').parent().children()).to.have.lengthOf(
-			2,
+			3,
 			'rendered the client component and a template'
 		);
 		expect($('#client').parent().find('template[data-astro-template]')).to.have.lengthOf(
@@ -85,11 +85,11 @@ describe('Component children', () => {
 		);
 
 		// test 3: If client, and children are rendered, no template is.
-		expect($('#client-render').parent().children()).to.have.lengthOf(1);
+		expect($('#client-render').parent().children()).to.have.lengthOf(2);
 		expect($('#client-render').parent().find('template')).to.have.lengthOf(0);
 
 		// test 4: If client and no children are provided, no template is.
-		expect($('#client-no-children').parent().children()).to.have.lengthOf(1);
+		expect($('#client-no-children').parent().children()).to.have.lengthOf(2);
 		expect($('#client-no-children').parent().find('template')).to.have.lengthOf(0);
 	});
 });

packages/astro/test/astro-client-only.test.js

@@ -1,6 +1,6 @@
 import { expect } from 'chai';
 import { load as cheerioLoad } from 'cheerio';
-import { loadFixture } from './test-utils.js';
+import { loadFixture, getIslandDataFromScript } from './test-utils.js';
 
 describe('Client only components', () => {
 	/** @type {import('./test-utils').Fixture} */
@@ -18,12 +18,14 @@ describe('Client only components', () => {
 	it('Loads pages using client:only hydrator', async () => {
 		const html = await fixture.readFile('/index.html');
 		const $ = cheerioLoad(html);
+		const script = $('astro-island > script').first();
+		const data = getIslandDataFromScript(script.text());
 
 		// test 1: <astro-island> is empty
-		expect($('astro-island').html()).to.equal('');
+		expect($('astro-island').first().children().length).to.equal(1);
 
 		// test 2: svelte renderer is on the page
-		expect($('astro-island').attr('renderer-url')).to.be.ok;
+		expect(data.rendererUrl).to.be.ok;
 	});
 
 	it('Adds the CSS to the page', async () => {
@@ -83,12 +85,14 @@ describe('Client only components subpath', () => {
 	it('Loads pages using client:only hydrator', async () => {
 		const html = await fixture.readFile('/index.html');
 		const $ = cheerioLoad(html);
+		const script = $('astro-island > script').first();
+		const data = getIslandDataFromScript(script.text());
 
 		// test 1: <astro-island> is empty
-		expect($('astro-island').html()).to.equal('');
+		expect($('astro-island').first().children.length).to.equal(1);
 
 		// test 2: svelte renderer is on the page
-		expect($('astro-island').attr('renderer-url')).to.be.ok;
+		expect(data.rendererUrl).to.be.ok;
 	});
 
 	it('Adds the CSS to the page', async () => {

packages/astro/test/astro-dynamic.test.js

@@ -1,6 +1,6 @@
 import { expect } from 'chai';
 import * as cheerio from 'cheerio';
-import { loadFixture } from './test-utils.js';
+import { loadFixture, getIslandDataFromScript } from './test-utils.js';
 
 describe('Dynamic components', () => {
 	let fixture;
@@ -16,7 +16,7 @@ describe('Dynamic components', () => {
 		const html = await fixture.readFile('/index.html');
 
 		const $ = cheerio.load(html);
-		expect($('script').length).to.eq(1);
+		expect($('script').length).to.eq(3);
 	});
 
 	it('Loads pages using client:media hydrator', async () => {
@@ -24,18 +24,19 @@ describe('Dynamic components', () => {
 		const $ = cheerio.load(html);
 
 		// test 1: static value rendered
-		expect($('script').length).to.equal(1);
+		expect($('script').length).to.equal(3);
 	});
 
 	it('Loads pages using client:only hydrator', async () => {
 		const html = await fixture.readFile('/client-only/index.html');
 		const $ = cheerio.load(html);
+		const script = $('astro-island > script').first();
+		const data = getIslandDataFromScript(script.text());
 
 		// test 1: <astro-island> is empty.
-		expect($('astro-island').html()).to.equal('');
+		expect($('astro-island').first().children().length).to.equal(1);
 		// test 2: component url
-		const href = $('astro-island').attr('component-url');
-		expect(href).to.include(`/PersistentCounter`);
+		expect(data.componentUrl).to.include(`/PersistentCounter`);
 	});
 });
 
@@ -55,7 +56,7 @@ describe('Dynamic components subpath', () => {
 		const html = await fixture.readFile('/index.html');
 
 		const $ = cheerio.load(html);
-		expect($('script').length).to.eq(1);
+		expect($('script').length).to.eq(3);
 	});
 
 	it('Loads pages using client:media hydrator', async () => {
@@ -63,17 +64,18 @@ describe('Dynamic components subpath', () => {
 		const $ = cheerio.load(html);
 
 		// test 1: static value rendered
-		expect($('script').length).to.equal(1);
+		expect($('script').length).to.equal(3);
 	});
 
 	it('Loads pages using client:only hydrator', async () => {
 		const html = await fixture.readFile('/client-only/index.html');
 		const $ = cheerio.load(html);
+		const script = $('astro-island > script').first();
+		const data = getIslandDataFromScript(script.text());
 
 		// test 1: <astro-island> is empty.
-		expect($('astro-island').html()).to.equal('');
-		// test 2: has component url
-		const attr = $('astro-island').attr('component-url');
-		expect(attr).to.include(`blog/_astro/PersistentCounter`);
+		expect($('astro-island').first().children().length).to.equal(1);
+		// test 2: component url
+		expect(data.componentUrl).to.include(`blog/_astro/PersistentCounter`);
 	});
 });

packages/astro/test/astro-slot-with-client.test.js

@@ -14,7 +14,7 @@ describe('Slots with client: directives', () => {
 	it('Tags of dynamic tags works', async () => {
 		const html = await fixture.readFile('/index.html');
 		const $ = cheerio.load(html);
-		expect($('script')).to.have.a.lengthOf(1);
+		expect($('script')).to.have.a.lengthOf(2);
 	});
 
 	it('Astro slot tags are cleaned', async () => {

packages/astro/test/astro-slots-nested.test.js

@@ -14,15 +14,16 @@ describe('Nested Slots', () => {
 	it('Hidden nested slots see their hydration scripts hoisted', async () => {
 		const html = await fixture.readFile('/hidden-nested/index.html');
 		const $ = cheerio.load(html);
-		expect($('script')).to.have.a.lengthOf(1, 'script rendered');
+		expect($('script')).to.have.a.lengthOf(3, 'script rendered');
+		// Astro Island scripts are, so this will only find other types of scripts
 		const scriptInTemplate = $($('template')[0].children[0]).find('script');
-		expect(scriptInTemplate).to.have.a.lengthOf(0, 'script defined outside of the inner template');
+		expect(scriptInTemplate).to.have.a.lengthOf(1, 'script defined outside of the inner template');
 	});
 
 	it('Slots rendered via Astro.slots.render have the hydration script', async () => {
 		const html = await fixture.readFile('/component-slot/index.html');
 		const $ = cheerio.load(html);
-		expect($('script')).to.have.a.lengthOf(1, 'script rendered');
+		expect($('script')).to.have.a.lengthOf(2, 'script rendered');
 	});
 
 	describe('Client components nested inside server-only framework components', () => {

packages/astro/test/before-hydration.test.js

@@ -1,6 +1,6 @@
 import { expect } from 'chai';
 import * as cheerio from 'cheerio';
-import { loadFixture } from './test-utils.js';
+import { loadFixture, getIslandDataFromScript } from './test-utils.js';
 import { preact } from './fixtures/before-hydration/deps.mjs';
 import testAdapter from './test-adapter.js';
 
@@ -43,7 +43,8 @@ describe('Astro Scripts before-hydration', () => {
 					let res = await fixture.fetch('/');
 					let html = await res.text();
 					let $ = cheerio.load(html);
-					expect($('astro-island[before-hydration-url]')).has.a.lengthOf(1);
+					const data = getIslandDataFromScript($('astro-island > script').first().text())
+					expect(data.beforeHydrationUrl).to.be.ok;
 				});
 			});
 
@@ -55,7 +56,8 @@ describe('Astro Scripts before-hydration', () => {
 				it('Is included in the astro-island', async () => {
 					let html = await fixture.readFile('/index.html');
 					let $ = cheerio.load(html);
-					expect($('astro-island[before-hydration-url]')).has.a.lengthOf(1);
+					const data = getIslandDataFromScript($('astro-island > script').first().text())
+					expect(data.beforeHydrationUrl).to.be.ok;
 				});
 			});
 		});
@@ -86,7 +88,8 @@ describe('Astro Scripts before-hydration', () => {
 					let res = await fixture.fetch('/');
 					let html = await res.text();
 					let $ = cheerio.load(html);
-					expect($('astro-island[before-hydration-url]')).has.a.lengthOf(1);
+					const data = getIslandDataFromScript($('astro-island > script').first().text())
+					expect(data.beforeHydrationUrl).to.be.ok;
 				});
 			});
 
@@ -98,7 +101,8 @@ describe('Astro Scripts before-hydration', () => {
 				it('Does not include before-hydration-url on the astro-island', async () => {
 					let html = await fixture.readFile('/index.html');
 					let $ = cheerio.load(html);
-					expect($('astro-island[before-hydration-url]')).has.a.lengthOf(0);
+					const data = getIslandDataFromScript($('astro-island > script').first().text())
+					expect(data.beforeHydrationUrl).not.to.be.ok;
 				});
 			});
 		});
@@ -139,7 +143,8 @@ describe('Astro Scripts before-hydration', () => {
 					let response = await app.render(request);
 					let html = await response.text();
 					let $ = cheerio.load(html);
-					expect($('astro-island[before-hydration-url]')).has.a.lengthOf(1);
+					const data = getIslandDataFromScript($('astro-island > script').first().text())
+					expect(data.beforeHydrationUrl).to.be.ok;
 				});
 			});
 		});
@@ -167,7 +172,8 @@ describe('Astro Scripts before-hydration', () => {
 					let response = await app.render(request);
 					let html = await response.text();
 					let $ = cheerio.load(html);
-					expect($('astro-island[before-hydration-url]')).has.a.lengthOf(0);
+					const data = getIslandDataFromScript($('astro-island > script').first().text())
+					expect(data.beforeHydrationUrl).not.to.be.ok;
 				});
 			});
 		});

packages/astro/test/build-assets.test.js

@@ -1,6 +1,6 @@
 import { expect } from 'chai';
 import * as cheerio from 'cheerio';
-import { loadFixture } from './test-utils.js';
+import { loadFixture, getIslandDataFromScript } from './test-utils.js';
 import { preact } from './fixtures/before-hydration/deps.mjs';
 import testAdapter from './test-adapter.js';
 
@@ -44,8 +44,9 @@ describe('build assets (static)', () => {
 
 			const island = $('astro-island');
 			expect(island.length).to.eq(1);
-			expect(island.attr('component-url')).to.match(/^\/_astro\//);
-			expect(island.attr('renderer-url')).to.match(/^\/_astro\//);
+			const data = getIslandDataFromScript(island.children('script').text())
+			expect(data.componentUrl).to.match(/^\/_astro\//);
+			expect(data.rendererUrl).to.match(/^\/_astro\//);
 		});
 	});
 
@@ -83,8 +84,9 @@ describe('build assets (static)', () => {
 
 			const island = $('astro-island');
 			expect(island.length).to.eq(1);
-			expect(island.attr('component-url')).to.match(/^\/custom-assets\//);
-			expect(island.attr('renderer-url')).to.match(/^\/custom-assets\//);
+			const data = getIslandDataFromScript(island.children('script').text())
+			expect(data.componentUrl).to.match(/^\/custom-assets\//);
+			expect(data.rendererUrl).to.match(/^\/custom-assets\//);
 		});
 	});
 });
@@ -130,8 +132,9 @@ describe('build assets (server)', () => {
 
 			const island = $('astro-island');
 			expect(island.length).to.eq(1);
-			expect(island.attr('component-url')).to.match(/^\/_astro\//);
-			expect(island.attr('renderer-url')).to.match(/^\/_astro\//);
+			const data = getIslandDataFromScript(island.children('script').text())
+			expect(data.componentUrl).to.match(/^\/_astro\//);
+			expect(data.rendererUrl).to.match(/^\/_astro\//);
 		});
 	});
 
@@ -170,8 +173,9 @@ describe('build assets (server)', () => {
 
 			const island = $('astro-island');
 			expect(island.length).to.eq(1);
-			expect(island.attr('component-url')).to.match(/^\/custom-assets\//);
-			expect(island.attr('renderer-url')).to.match(/^\/custom-assets\//);
+			const data = getIslandDataFromScript(island.children('script').text())
+			expect(data.componentUrl).to.match(/^\/custom-assets\//);
+			expect(data.rendererUrl).to.match(/^\/custom-assets\//);
 		});
 	});
 });

packages/astro/test/fixtures/astro-dynamic/src/pages/index.astro

@@ -6,8 +6,6 @@ import SvelteCounter from '../components/SvelteCounter.svelte';
 <head><title>Dynamic pages</title></head>
 <body>
   <Counter client:load />
-
-  <!-- Including the original hydration syntax to test backwards compatibility -->
   <SvelteCounter client:load />
 </body>
-</html>
+</html>

packages/astro/test/hydration-race.test.js

@@ -24,6 +24,6 @@ describe('Hydration script ordering', async () => {
 
 		// Sanity check that we're only rendering them once.
 		expect($('style')).to.have.a.lengthOf(1, 'hydration style added once');
-		expect($('script')).to.have.a.lengthOf(1, 'only one hydration script needed');
+		expect($('script')).to.have.a.lengthOf(4, 'only one hydration script needed');
 	});
 });

packages/astro/test/reexport-astro-containing-client-component.test.js

@@ -1,6 +1,6 @@
 import { expect } from 'chai';
 import * as cheerio from 'cheerio';
-import { loadFixture } from './test-utils.js';
+import { loadFixture, getIslandDataFromScript } from './test-utils.js';
 
 describe('Re-exported astro components with client components', () => {
 	let fixture;
@@ -14,6 +14,7 @@ describe('Re-exported astro components with client components', () => {
 		const html = await fixture.readFile('/index.html');
 		const $ = cheerio.load(html);
 		expect($('astro-island').length).to.equal(1);
-		expect($('astro-island').attr('component-export')).to.equal('One');
+		const data = getIslandDataFromScript($('astro-island > script').text())
+		expect(data.componentExport).to.equal('One');
 	});
 });

packages/astro/test/serialize.test.js

@@ -1,113 +0,0 @@
-import { expect } from 'chai';
-import { serializeProps } from '../dist/runtime/server/serialize.js';
-
-describe('serialize', () => {
-	it('serializes undefined', () => {
-		const input = { a: undefined };
-		const output = `{"a":[0]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes null', () => {
-		const input = { a: null };
-		const output = `{"a":[0,null]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a boolean', () => {
-		const input = { a: false };
-		const output = `{"a":[0,false]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a number', () => {
-		const input = { a: 1 };
-		const output = `{"a":[0,1]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a string', () => {
-		const input = { a: 'b' };
-		const output = `{"a":[0,"b"]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes an object', () => {
-		const input = { a: { b: 'c' } };
-		const output = `{"a":[0,{"b":[0,"c"]}]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes an array', () => {
-		const input = { a: [0] };
-		const output = `{"a":[1,[[0,0]]]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('can serialize deeply nested data without quadratic quote escaping', () => {
-		const input = { a: [{ b: [{ c: [{ d: [{ e: [{ f: [{ g: ['leaf'] }] }] }] }] }] }] };
-		const output =
-			'{"a":[1,[[0,{"b":[1,[[0,{"c":[1,[[0,{"d":[1,[[0,{"e":[1,[[0,{"f":[1,[[0,{"g":[1,[[0,"leaf"]]]}]]]}]]]}]]]}]]]}]]]}]]]}';
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a regular expression', () => {
-		const input = { a: /b/ };
-		const output = `{"a":[2,"b"]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a Date', () => {
-		const input = { a: new Date(0) };
-		const output = `{"a":[3,"1970-01-01T00:00:00.000Z"]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a Map', () => {
-		const input = { a: new Map([[0, 1]]) };
-		const output = `{"a":[4,[[1,[[0,0],[0,1]]]]]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a Set', () => {
-		const input = { a: new Set([0, 1, 2, 3]) };
-		const output = `{"a":[5,[[0,0],[0,1],[0,2],[0,3]]]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a BigInt', () => {
-		const input = { a: BigInt('1') };
-		const output = `{"a":[6,"1"]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a URL', () => {
-		const input = { a: new URL('https://example.com/') };
-		const output = `{"a":[7,"https://example.com/"]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a Uint8Array', () => {
-		const input = { a: new Uint8Array([1, 2, 3]) };
-		const output = `{"a":[8,[1,2,3]]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a Uint16Array', () => {
-		const input = { a: new Uint16Array([1, 2, 3]) };
-		const output = `{"a":[9,[1,2,3]]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('serializes a Uint32Array', () => {
-		const input = { a: new Uint32Array([1, 2, 3]) };
-		const output = `{"a":[10,[1,2,3]]}`;
-		expect(serializeProps(input)).to.equal(output);
-	});
-	it('cannot serialize a cyclic reference', () => {
-		const a = {};
-		a.b = a;
-		const input = { a };
-		expect(() => serializeProps(input)).to.throw(/cyclic/);
-	});
-	it('cannot serialize a cyclic array', () => {
-		const input = { foo: ['bar'] };
-		input.foo.push(input);
-		expect(() => serializeProps(input)).to.throw(/cyclic/);
-	});
-	it('cannot serialize a deep cyclic reference', () => {
-		const a = { b: {} };
-		a.b.c = a;
-		const input = { a };
-		expect(() => serializeProps(input)).to.throw(/cyclic/);
-	});
-	it('can serialize shared references that are not cyclic', () => {
-		const b = {};
-		const input = { a: { b, b }, b };
-		expect(() => serializeProps(input)).not.to.throw();
-	});
-});

packages/astro/test/test-utils.js

@@ -242,6 +242,21 @@ export async function loadFixture(inlineConfig) {
 	};
 }
 
+/**
+ * 
+ * @param {string} text
+ * @returns {{ componentUrl: string, componentExport: string, rendererUrl: string, beforeHydrationUrl?: string, opts: Record<string, unknown>, props: Record<string, unknown> }}
+ */
+export function getIslandDataFromScript(text) {
+	const Astro = { assign: (_, props) => props };
+	const document = {};
+	const args = { Astro, document }
+
+	// Yes, I know, `eval` is bad! But our data is embedded as JS on purpose.
+	// eslint-disable-next-line @typescript-eslint/no-implied-eval
+	return new Function(Object.keys(args), `return ${text}`)(...Object.values(args));
+}
+
 /**
  * @param {string} [address]
  */

pnpm-lock.yaml

@@ -605,6 +605,9 @@ importers:
       semver:
         specifier: ^7.5.3
         version: 7.5.3
+      seroval:
+        specifier: ^0.9.0
+        version: 0.9.0
       server-destroy:
         specifier: ^1.0.1
         version: 1.0.1
@@ -15869,6 +15872,11 @@ packages:
     resolution: {integrity: sha512-ZfhQVB59hmIauJG5Ydynupy8KHyr5imGNtdDhbZG68Ufh1Ynkv9KOYOAABf71oVbQxJ8VkWnMHAjEHE7fWkH5g==}
     engines: {node: '>=10'}
 
+  /seroval@0.9.0:
+    resolution: {integrity: sha512-Ttr96/8czi3SXjbFFzpRc2Xpp1wvBufmaNuTviUL8eGQhUr1mdeiQ6YYSaLnMwMc4YWSeBggq72bKEBVu6/IFA==}
+    engines: {node: '>=10'}
+    dev: false
+
   /server-destroy@1.0.1:
     resolution: {integrity: sha512-rb+9B5YBIEzYcD6x2VKidaa+cqYBJQKnU4oe4E3ANwRRN56yk/ua1YCJT1n21NTS8w6CcOclAKNP3PhdCXKYtQ==}
     dev: false
@@ -18158,25 +18166,21 @@ packages:
   file:packages/astro/test/fixtures/css-assets/packages/font-awesome:
     resolution: {directory: packages/astro/test/fixtures/css-assets/packages/font-awesome, type: directory}
     name: '@test/astro-font-awesome-package'
-    version: 0.0.1
     dev: false
 
   file:packages/astro/test/fixtures/multiple-renderers/renderers/one:
     resolution: {directory: packages/astro/test/fixtures/multiple-renderers/renderers/one, type: directory}
     name: '@test/astro-renderer-one'
-    version: 1.0.0
     dev: false
 
   file:packages/astro/test/fixtures/multiple-renderers/renderers/two:
     resolution: {directory: packages/astro/test/fixtures/multiple-renderers/renderers/two, type: directory}
     name: '@test/astro-renderer-two'
-    version: 1.0.0
     dev: false
 
   file:packages/astro/test/fixtures/solid-component/deps/solid-jsx-component:
     resolution: {directory: packages/astro/test/fixtures/solid-component/deps/solid-jsx-component, type: directory}
     name: '@test/solid-jsx-component'
-    version: 0.0.0
     dependencies:
       solid-js: 1.7.6
     dev: false