Revert preact signals support (#4843)

* Revert "Update preact example to match @astrojs/preact ranges (#4840)"

This reverts commit d650a1161a0288f8f2d35ae67771279d067920e9.

* Revert "[ci] format"

This reverts commit e3c78c5b164c338389c437743ba02a7be64e27fb.

* Revert "Support shared signals in Preact islands (#4763)"

This reverts commit 5e46be54683592773e6dfc2d33825493886114b0.

7 files changed, 0 insertions, 291 deletions

diff --git a/packages/integrations/preact/src/client-dev.ts b/packages/integrations/preact/src/client-dev.ts
deleted file mode 100644
index 9a9edcb3b..000000000
--- a/packages/integrations/preact/src/client-dev.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-// @ts-ignore
-import 'preact/debug';
-import clientFn from './client.js';
-
-export default clientFn;
diff --git a/packages/integrations/preact/src/client.ts b/packages/integrations/preact/src/client.ts
deleted file mode 100644
index 4549e79f4..000000000
--- a/packages/integrations/preact/src/client.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-import { h, render } from 'preact';
-import StaticHtml from './static-html.js';
-import type { SignalLike } from './types';
-
-const sharedSignalMap: Map<string, SignalLike> = new Map();
-
-export default (element: HTMLElement) =>
-	async (
-		Component: any,
-		props: Record<string, any>,
-		{ default: children, ...slotted }: Record<string, any>
-	) => {
-		if (!element.hasAttribute('ssr')) return;
-		for (const [key, value] of Object.entries(slotted)) {
-			props[key] = h(StaticHtml, { value, name: key });
-		}
-		let signalsRaw = element.dataset.preactSignals;
-		if (signalsRaw) {
-			const { signal } = await import('@preact/signals');
-			let signals: Record<string, string> = JSON.parse(element.dataset.preactSignals as string);
-			for (const [propName, signalId] of Object.entries(signals)) {
-				if (!sharedSignalMap.has(signalId)) {
-					const signalValue = signal(props[propName]);
-					sharedSignalMap.set(signalId, signalValue);
-				}
-				props[propName] = sharedSignalMap.get(signalId);
-			}
-		}
-		render(
-			h(Component, props, children != null ? h(StaticHtml, { value: children }) : children),
-			element
-		);
-	};
diff --git a/packages/integrations/preact/src/context.ts b/packages/integrations/preact/src/context.ts
deleted file mode 100644
index c711017c4..000000000
--- a/packages/integrations/preact/src/context.ts
+++ /dev/null
@@ -1,32 +0,0 @@
-import type { PropNameToSignalMap, RendererContext, SignalLike } from './types';
-
-export type Context = {
-	id: string;
-	c: number;
-	signals: Map<SignalLike, string>;
-	propsToSignals: Map<Record<string, any>, PropNameToSignalMap>;
-};
-
-const contexts = new WeakMap<RendererContext['result'], Context>();
-
-export function getContext(result: RendererContext['result']): Context {
-	if (contexts.has(result)) {
-		return contexts.get(result)!;
-	}
-	let ctx = {
-		c: 0,
-		get id() {
-			return 'p' + this.c.toString();
-		},
-		signals: new Map(),
-		propsToSignals: new Map(),
-	};
-	contexts.set(result, ctx);
-	return ctx;
-}
-
-export function incrementId(ctx: Context): string {
-	let id = ctx.id;
-	ctx.c++;
-	return id;
-}
diff --git a/packages/integrations/preact/src/server.ts b/packages/integrations/preact/src/server.ts
deleted file mode 100644
index 212e183cf..000000000
--- a/packages/integrations/preact/src/server.ts
+++ /dev/null
@@ -1,130 +0,0 @@
-import { Component as BaseComponent, h } from 'preact';
-import render from 'preact-render-to-string';
-import { getContext } from './context.js';
-import { restoreSignalsOnProps, serializeSignals } from './signals.js';
-import StaticHtml from './static-html.js';
-import type { AstroPreactAttrs, RendererContext } from './types';
-
-const slotName = (str: string) => str.trim().replace(/[-_]([a-z])/g, (_, w) => w.toUpperCase());
-
-let originalConsoleError: typeof console.error;
-let consoleFilterRefs = 0;
-
-function check(this: RendererContext, Component: any, props: Record<string, any>, children: any) {
-	if (typeof Component !== 'function') return false;
-
-	if (Component.prototype != null && typeof Component.prototype.render === 'function') {
-		return BaseComponent.isPrototypeOf(Component);
-	}
-
-	useConsoleFilter();
-
-	try {
-		try {
-			const { html } = renderToStaticMarkup.call(this, Component, props, children);
-			if (typeof html !== 'string') {
-				return false;
-			}
-
-			// There are edge cases (SolidJS) where Preact *might* render a string,
-			// but components would be <undefined></undefined>
-
-			return !/\<undefined\>/.test(html);
-		} catch (err) {
-			return false;
-		}
-	} finally {
-		finishUsingConsoleFilter();
-	}
-}
-
-function renderToStaticMarkup(
-	this: RendererContext,
-	Component: any,
-	props: Record<string, any>,
-	{ default: children, ...slotted }: Record<string, any>
-) {
-	const ctx = getContext(this.result);
-
-	const slots: Record<string, ReturnType<typeof h>> = {};
-	for (const [key, value] of Object.entries(slotted)) {
-		const name = slotName(key);
-		slots[name] = h(StaticHtml, { value, name });
-	}
-
-	// Restore signals back onto props so that they will be passed as-is to components
-	let propsMap = restoreSignalsOnProps(ctx, props);
-
-	const newProps = { ...props, ...slots };
-
-	const attrs: AstroPreactAttrs = {};
-	serializeSignals(ctx, props, attrs, propsMap);
-
-	const html = render(
-		h(Component, newProps, children != null ? h(StaticHtml, { value: children }) : children)
-	);
-	return {
-		attrs,
-		html,
-	};
-}
-
-/**
- * Reduces console noise by filtering known non-problematic errors.
- *
- * Performs reference counting to allow parallel usage from async code.
- *
- * To stop filtering, please ensure that there always is a matching call
- * to `finishUsingConsoleFilter` afterwards.
- */
-function useConsoleFilter() {
-	consoleFilterRefs++;
-
-	if (!originalConsoleError) {
-		// eslint-disable-next-line no-console
-		originalConsoleError = console.error;
-
-		try {
-			// eslint-disable-next-line no-console
-			console.error = filteredConsoleError;
-		} catch (error) {
-			// If we're unable to hook `console.error`, just accept it
-		}
-	}
-}
-
-/**
- * Indicates that the filter installed by `useConsoleFilter`
- * is no longer needed by the calling code.
- */
-function finishUsingConsoleFilter() {
-	consoleFilterRefs--;
-
-	// Note: Instead of reverting `console.error` back to the original
-	// when the reference counter reaches 0, we leave our hook installed
-	// to prevent potential race conditions once `check` is made async
-}
-
-/**
- * Hook/wrapper function for the global `console.error` function.
- *
- * Ignores known non-problematic errors while any code is using the console filter.
- * Otherwise, simply forwards all arguments to the original function.
- */
-function filteredConsoleError(msg: string, ...rest: any[]) {
-	if (consoleFilterRefs > 0 && typeof msg === 'string') {
-		// In `check`, we attempt to render JSX components through Preact.
-		// When attempting this on a React component, React may output
-		// the following error, which we can safely filter out:
-		const isKnownReactHookError =
-			msg.includes('Warning: Invalid hook call.') &&
-			msg.includes('https://reactjs.org/link/invalid-hook-call');
-		if (isKnownReactHookError) return;
-	}
-	originalConsoleError(msg, ...rest);
-}
-
-export default {
-	check,
-	renderToStaticMarkup,
-};
diff --git a/packages/integrations/preact/src/signals.ts b/packages/integrations/preact/src/signals.ts
deleted file mode 100644
index 3fa1529f4..000000000
--- a/packages/integrations/preact/src/signals.ts
+++ /dev/null
@@ -1,53 +0,0 @@
-import type { Context } from './context';
-import { incrementId } from './context.js';
-import type { AstroPreactAttrs, PropNameToSignalMap, SignalLike } from './types';
-
-function isSignal(x: any): x is SignalLike {
-	return x != null && typeof x === 'object' && typeof x.peek === 'function' && 'value' in x;
-}
-
-export function restoreSignalsOnProps(ctx: Context, props: Record<string, any>) {
-	// Restore signal props that were mutated for serialization
-	let propMap: PropNameToSignalMap;
-	if (ctx.propsToSignals.has(props)) {
-		propMap = ctx.propsToSignals.get(props)!;
-	} else {
-		propMap = new Map();
-		ctx.propsToSignals.set(props, propMap);
-	}
-	for (const [key, signal] of propMap) {
-		props[key] = signal;
-	}
-	return propMap;
-}
-
-export function serializeSignals(
-	ctx: Context,
-	props: Record<string, any>,
-	attrs: AstroPreactAttrs,
-	map: PropNameToSignalMap
-) {
-	// Check for signals
-	const signals: Record<string, string> = {};
-	for (const [key, value] of Object.entries(props)) {
-		if (isSignal(value)) {
-			// Set the value to the current signal value
-			// This mutates the props on purpose, so that it will be serialized correct.
-			props[key] = value.peek();
-			map.set(key, value);
-
-			let id: string;
-			if (ctx.signals.has(value)) {
-				id = ctx.signals.get(value)!;
-			} else {
-				id = incrementId(ctx);
-				ctx.signals.set(value, id);
-			}
-			signals[key] = id;
-		}
-	}
-
-	if (Object.keys(signals).length) {
-		attrs['data-preact-signals'] = JSON.stringify(signals);
-	}
-}
diff --git a/packages/integrations/preact/src/static-html.ts b/packages/integrations/preact/src/static-html.ts
deleted file mode 100644
index e1127d226..000000000
--- a/packages/integrations/preact/src/static-html.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-import { h } from 'preact';
-
-/**
- * Astro passes `children` as a string of HTML, so we need
- * a wrapper `div` to render that content as VNodes.
- *
- * As a bonus, we can signal to Preact that this subtree is
- * entirely static and will never change via `shouldComponentUpdate`.
- */
-const StaticHtml = ({ value, name }: { value: string; name?: string }) => {
-	if (!value) return null;
-	return h('astro-slot', { name, dangerouslySetInnerHTML: { __html: value } });
-};
-
-/**
- * This tells Preact to opt-out of re-rendering this subtree,
- * In addition to being a performance optimization,
- * this also allows other frameworks to attach to `children`.
- *
- * See https://preactjs.com/guide/v8/external-dom-mutations
- */
-StaticHtml.shouldComponentUpdate = () => false;
-
-export default StaticHtml;
diff --git a/packages/integrations/preact/src/types.ts b/packages/integrations/preact/src/types.ts
deleted file mode 100644
index 93f65bbc2..000000000
--- a/packages/integrations/preact/src/types.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import type { SSRResult } from 'astro';
-export type RendererContext = {
-	result: SSRResult;
-};
-
-export type SignalLike = {
-	peek(): any;
-};
-
-export type PropNameToSignalMap = Map<string, SignalLike>;
-
-export type AstroPreactAttrs = {
-	['data-preact-signals']?: string;
-};