Revert "Ensure hydration scripts inside of slots render ASAP (#4288)" (#4302)

* Revert "Ensure hydration scripts inside of slots render ASAP (#4288)"

This reverts commit c218100684c90c2b5c490e73b0687ad59d0c58df.

* Create khaki-dots-press.md

16 files changed, 44 insertions, 114 deletions

diff --git a/.changeset/khaki-dots-press.md b/.changeset/khaki-dots-press.md
new file mode 100644
index 000000000..fe47b2608
--- /dev/null
+++ b/.changeset/khaki-dots-press.md
@@ -0,0 +1,5 @@
+---
+"astro": patch
+---
+
+Revert "Ensure hydration scripts inside of slots render ASAP (#4288)" to fix Svelte integration bug
diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
index 5c8473e58..fdb50889e 100644
--- a/packages/astro/src/@types/astro.ts
+++ b/packages/astro/src/@types/astro.ts
@@ -1135,25 +1135,11 @@ export interface SSRElement {
 	children: string;
 }
 
-export interface HydrationMetadata {
-	directive: string;
-	value: string;
-	componentUrl: string;
-	componentExport: { value: string };
-}
-
-export interface SSRRenderInstruction {
-	type: 'directive';
-	result: SSRResult;
-	hydration: HydrationMetadata;
-}
-
 export interface SSRMetadata {
 	renderers: SSRLoadedRenderer[];
 	pathname: string;
 	hasHydrationScript: boolean;
 	hasDirectives: Set<string>;
-	pendingInstructions: Set<SSRRenderInstruction>;
 }
 
 export interface SSRResult {
diff --git a/packages/astro/src/core/render/result.ts b/packages/astro/src/core/render/result.ts
index 37b07cb06..32dcdd916 100644
--- a/packages/astro/src/core/render/result.ts
+++ b/packages/astro/src/core/render/result.ts
@@ -265,7 +265,6 @@ const canonicalURL = new URL(Astro.url.pathname, Astro.site);
 			pathname,
 			hasHydrationScript: false,
 			hasDirectives: new Set(),
-			pendingInstructions: new Set(),
 		},
 		response,
 	};
diff --git a/packages/astro/src/runtime/server/hydration.ts b/packages/astro/src/runtime/server/hydration.ts
index e57b59d1f..d58dc406e 100644
--- a/packages/astro/src/runtime/server/hydration.ts
+++ b/packages/astro/src/runtime/server/hydration.ts
@@ -1,6 +1,5 @@
 import type {
 	AstroComponentMetadata,
-	HydrationMetadata,
 	SSRElement,
 	SSRLoadedRenderer,
 	SSRResult,
@@ -13,7 +12,12 @@ const HydrationDirectivesRaw = ['load', 'idle', 'media', 'visible', 'only'];
 const HydrationDirectives = new Set(HydrationDirectivesRaw);
 export const HydrationDirectiveProps = new Set(HydrationDirectivesRaw.map((n) => `client:${n}`));
 
-export { HydrationMetadata };
+export interface HydrationMetadata {
+	directive: string;
+	value: string;
+	componentUrl: string;
+	componentExport: { value: string };
+}
 
 interface ExtractedProps {
 	isPage: boolean;
diff --git a/packages/astro/src/runtime/server/index.ts b/packages/astro/src/runtime/server/index.ts
index c80811843..1304aca3e 100644
--- a/packages/astro/src/runtime/server/index.ts
+++ b/packages/astro/src/runtime/server/index.ts
@@ -26,7 +26,7 @@ export {
 	stringifyChunk,
 	voidElementNames,
 } from './render/index.js';
-export type { AstroComponentFactory } from './render/index.js';
+export type { AstroComponentFactory, RenderInstruction } from './render/index.js';
 import type { AstroComponentFactory } from './render/index.js';
 
 import { markHTMLString } from './escape.js';
diff --git a/packages/astro/src/runtime/server/jsx.ts b/packages/astro/src/runtime/server/jsx.ts
index 665f67348..f7f566788 100644
--- a/packages/astro/src/runtime/server/jsx.ts
+++ b/packages/astro/src/runtime/server/jsx.ts
@@ -1,15 +1,16 @@
 /* eslint-disable no-console */
-import { SSRRenderInstruction, SSRResult } from '../../@types/astro.js';
+import { SSRResult } from '../../@types/astro.js';
 import { AstroJSX, isVNode } from '../../jsx-runtime/index.js';
 import {
 	escapeHTML,
 	HTMLString,
 	markHTMLString,
 	renderComponent,
+	RenderInstruction,
 	renderToString,
 	spreadAttributes,
 	stringifyChunk,
-	voidElementNames,
+	voidElementNames
 } from './index.js';
 
 const ClientOnlyPlaceholder = 'astro-client-only';
@@ -121,7 +122,7 @@ export async function renderJSX(result: SSRResult, vnode: any): Promise<any> {
 			}
 			await Promise.all(slotPromises);
 
-			let output: string | AsyncIterable<string | SSRRenderInstruction>;
+			let output: string | AsyncIterable<string | RenderInstruction>;
 			if (vnode.type === ClientOnlyPlaceholder && vnode.props['client:only']) {
 				output = await renderComponent(
 					result,
diff --git a/packages/astro/src/runtime/server/render/any.ts b/packages/astro/src/runtime/server/render/any.ts
index 62d4f5a0c..af55ac099 100644
--- a/packages/astro/src/runtime/server/render/any.ts
+++ b/packages/astro/src/runtime/server/render/any.ts
@@ -1,7 +1,7 @@
-import { SSRRenderInstruction, SSRResult } from '../../../@types/astro';
 import { escapeHTML, HTMLString, markHTMLString } from '../escape.js';
 import { AstroComponent, renderAstroComponent } from './astro.js';
-
+import { stringifyChunk } from './common.js';
+	
 export async function* renderChild(child: any): AsyncIterable<any> {
 	child = await child;
 	if (child instanceof HTMLString) {
@@ -34,19 +34,13 @@ export async function* renderChild(child: any): AsyncIterable<any> {
 	}
 }
 
-export async function renderSlot(
-	result: SSRResult,
-	slotted: string,
-	fallback?: any
-): Promise<string> {
+export async function renderSlot(result: any, slotted: string, fallback?: any): Promise<string> {
 	if (slotted) {
 		let iterator = renderChild(slotted);
 		let content = '';
 		for await (const chunk of iterator) {
 			if ((chunk as any).type === 'directive') {
-				// Do not render directives scripts in a slot, instead mark them as pending
-				// so that renderPage includes them ASAP.
-				result._metadata.pendingInstructions.add(chunk as SSRRenderInstruction);
+				content += stringifyChunk(result, chunk);
 			} else {
 				content += chunk;
 			}
diff --git a/packages/astro/src/runtime/server/render/astro.ts b/packages/astro/src/runtime/server/render/astro.ts
index f328ce973..b7e47a68c 100644
--- a/packages/astro/src/runtime/server/render/astro.ts
+++ b/packages/astro/src/runtime/server/render/astro.ts
@@ -1,5 +1,6 @@
-import type { SSRRenderInstruction, SSRResult } from '../../../@types/astro';
+import type { SSRResult } from '../../../@types/astro';
 import type { AstroComponentFactory } from './index';
+import type { RenderInstruction } from './types';
 
 import { markHTMLString } from '../escape.js';
 import { HydrationDirectiveProps } from '../hydration.js';
@@ -57,7 +58,7 @@ export function isAstroComponent(obj: any): obj is AstroComponent {
 
 export async function* renderAstroComponent(
 	component: InstanceType<typeof AstroComponent>
-): AsyncIterable<string | SSRRenderInstruction> {
+): AsyncIterable<string | RenderInstruction> {
 	for await (const value of component) {
 		if (value || value === 0) {
 			for await (const chunk of renderChild(value)) {
@@ -103,7 +104,7 @@ export async function renderToIterable(
 	displayName: string,
 	props: any,
 	children: any
-): Promise<AsyncIterable<string | SSRRenderInstruction>> {
+): Promise<AsyncIterable<string | RenderInstruction>> {
 	validateComponentProps(props, displayName);
 	const Component = await componentFactory(result, props, children);
 
diff --git a/packages/astro/src/runtime/server/render/common.ts b/packages/astro/src/runtime/server/render/common.ts
index 61a2377cc..cbb342e68 100644
--- a/packages/astro/src/runtime/server/render/common.ts
+++ b/packages/astro/src/runtime/server/render/common.ts
@@ -1,11 +1,12 @@
-import type { SSRRenderInstruction, SSRResult } from '../../../@types/astro';
+import type { SSRResult } from '../../../@types/astro';
+import type { RenderInstruction } from './types.js';
 
 import { markHTMLString } from '../escape.js';
 import {
 	determineIfNeedsHydrationScript,
 	determinesIfNeedsDirectiveScript,
 	getPrescripts,
-	PrescriptType,
+	PrescriptType
 } from '../scripts.js';
 
 export const Fragment = Symbol.for('astro:fragment');
@@ -14,10 +15,10 @@ export const Renderer = Symbol.for('astro:renderer');
 // Rendering produces either marked strings of HTML or instructions for hydration.
 // These directive instructions bubble all the way up to renderPage so that we
 // can ensure they are added only once, and as soon as possible.
-export function stringifyChunk(result: SSRResult, chunk: string | SSRRenderInstruction) {
+export function stringifyChunk(result: SSRResult, chunk: string | RenderInstruction) {
 	switch ((chunk as any).type) {
 		case 'directive': {
-			const { hydration } = chunk as SSRRenderInstruction;
+			const { hydration } = chunk as RenderInstruction;
 			let needsHydrationScript = hydration && determineIfNeedsHydrationScript(result);
 			let needsDirectiveScript =
 				hydration && determinesIfNeedsDirectiveScript(result, hydration.directive);
diff --git a/packages/astro/src/runtime/server/render/component.ts b/packages/astro/src/runtime/server/render/component.ts
index 34740ab24..ea1c3a9ed 100644
--- a/packages/astro/src/runtime/server/render/component.ts
+++ b/packages/astro/src/runtime/server/render/component.ts
@@ -1,9 +1,8 @@
 import type {
 	AstroComponentMetadata,
-	SSRLoadedRenderer,
-	SSRRenderInstruction,
-	SSRResult,
+	SSRLoadedRenderer, SSRResult
 } from '../../../@types/astro';
+import type { RenderInstruction } from './types.js';
 
 import { markHTMLString } from '../escape.js';
 import { extractDirectives, generateHydrateScript } from '../hydration.js';
@@ -53,7 +52,7 @@ export async function renderComponent(
 	Component: unknown,
 	_props: Record<string | number, any>,
 	slots: any = {}
-): Promise<string | AsyncIterable<string | SSRRenderInstruction>> {
+): Promise<string | AsyncIterable<string | RenderInstruction>> {
 	Component = await Component;
 
 	switch (getComponentType(Component)) {
@@ -83,7 +82,7 @@ export async function renderComponent(
 
 		case 'astro-factory': {
 			async function* renderAstroComponentInline(): AsyncGenerator<
-				string | SSRRenderInstruction,
+				string | RenderInstruction,
 				void,
 				undefined
 			> {
diff --git a/packages/astro/src/runtime/server/render/index.ts b/packages/astro/src/runtime/server/render/index.ts
index 1567307d5..a7de515e2 100644
--- a/packages/astro/src/runtime/server/render/index.ts
+++ b/packages/astro/src/runtime/server/render/index.ts
@@ -7,6 +7,7 @@ export { renderComponent } from './component.js';
 export { renderHTMLElement } from './dom.js';
 export { maybeRenderHead, renderHead } from './head.js';
 export { renderPage } from './page.js';
+export type { RenderInstruction } from './types';
 export { addAttribute, defineScriptVars, voidElementNames } from './util.js';
 
 // The callback passed to to $$createComponent
diff --git a/packages/astro/src/runtime/server/render/page.ts b/packages/astro/src/runtime/server/render/page.ts
index 85dbec01e..9e2c0fd2b 100644
--- a/packages/astro/src/runtime/server/render/page.ts
+++ b/packages/astro/src/runtime/server/render/page.ts
@@ -49,28 +49,13 @@ export async function renderPage(
 		let headers = new Headers(init.headers);
 		let body: BodyInit;
 
-		// Combines HTML chunks coming from the iterable with rendering instructions
-		// added to metadata. These instructions need to go out first to ensure
-		// the scripts exist before the islands that need them.
-		async function* eachChunk() {
-			for await (const chunk of iterable) {
-				if (result._metadata.pendingInstructions.size) {
-					for (const instr of result._metadata.pendingInstructions) {
-						result._metadata.pendingInstructions.delete(instr);
-						yield instr;
-					}
-				}
-				yield chunk;
-			}
-		}
-
 		if (streaming) {
 			body = new ReadableStream({
 				start(controller) {
 					async function read() {
 						let i = 0;
 						try {
-							for await (const chunk of eachChunk()) {
+							for await (const chunk of iterable) {
 								let html = stringifyChunk(result, chunk);
 
 								if (i === 0) {
@@ -92,7 +77,7 @@ export async function renderPage(
 		} else {
 			body = '';
 			let i = 0;
-			for await (const chunk of eachChunk()) {
+			for await (const chunk of iterable) {
 				let html = stringifyChunk(result, chunk);
 				if (i === 0) {
 					if (!/<!doctype html/i.test(html)) {
diff --git a/packages/astro/src/runtime/server/render/types.ts b/packages/astro/src/runtime/server/render/types.ts
new file mode 100644
index 000000000..a9e1afe65
--- /dev/null
+++ b/packages/astro/src/runtime/server/render/types.ts
@@ -0,0 +1,8 @@
+import type { SSRResult } from '../../../@types/astro';
+import type { HydrationMetadata } from '../hydration.js';
+
+export interface RenderInstruction {
+	type: 'directive';
+	result: SSRResult;
+	hydration: HydrationMetadata;
+}
diff --git a/packages/astro/test/fixtures/hydration-race/src/components/Layout.astro b/packages/astro/test/fixtures/hydration-race/src/components/Layout.astro
deleted file mode 100644
index 8ee14c08f..000000000
--- a/packages/astro/test/fixtures/hydration-race/src/components/Layout.astro
+++ /dev/null
@@ -1,6 +0,0 @@
----
-import Wrapper from './Wrapper.astro';
----
-
-<Wrapper />
-<slot />
diff --git a/packages/astro/test/fixtures/hydration-race/src/pages/slot.astro b/packages/astro/test/fixtures/hydration-race/src/pages/slot.astro
deleted file mode 100644
index 7f054d45f..000000000
--- a/packages/astro/test/fixtures/hydration-race/src/pages/slot.astro
+++ /dev/null
@@ -1,15 +0,0 @@
----
-import Layout from '../components/Layout.astro';
-import Wrapper from '../components/Wrapper.astro';
-import One from '../components/One.jsx';
----
-<html>
-<head>
-	<title>Testing</title>
-</head>
-<body>
-	<Layout>
-		<One name="Three" client:idle />
-	</Layout>
-</body>
-</html>
diff --git a/packages/astro/test/hydration-race.test.js b/packages/astro/test/hydration-race.test.js
index 803a65a00..d35681557 100644
--- a/packages/astro/test/hydration-race.test.js
+++ b/packages/astro/test/hydration-race.test.js
@@ -26,37 +26,4 @@ describe('Hydration script ordering', async () => {
 		expect($('style')).to.have.a.lengthOf(1, 'hydration style added once');
 		expect($('script')).to.have.a.lengthOf(1, 'only one hydration script needed');
 	});
-
-	it('Hydration placed in correct location when there is slots used', async () => {
-		let html = await fixture.readFile('/slot/index.html');
-		let $ = cheerio.load(html);
-		//console.log(html);
-
-		// First, let's make sure all islands rendered (or test is bad)
-		expect($('astro-island')).to.have.a.lengthOf(3);
-
-		// Now let's make sure the hydration script is placed before the first component
-		let firstIsland = $($('astro-island').get(0));
-		let el = firstIsland.prev();
-		let foundScript = false;
-
-		// Traverse the DOM going backwards until we find a script, if there is one.
-		while (el.length) {
-			let last = el;
-			while (el.length) {
-				if (el.prop('tagName') === 'SCRIPT') {
-					foundScript = true;
-				}
-				last = el;
-				el = el.prev();
-			}
-			el = last.parent();
-		}
-
-		expect(foundScript).to.be.true;
-
-		// 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');
-	});
 });