Remove @astrojs/lit (#11680)

* Remove @astrojs/lit

This removes the Lit integration as an official integration. The reasons
for doing so in 5.0:

- Only 1% of Astro users use this integration.
- SSR support in Lit is at a lower-level of support due to be a Labs
project: https://lit.dev/docs/libraries/labs/, and has been in this
state since we added support a couple of years ago.
- The maintenance cost of fixing bugs in this integration is too high
given the low usage. Some PRs for upgrading Lit versions have taken
quite a long time. We can't justify the core team being responsible for
this going forward.
- There used to be community contributions to fix bugs but this has
fallen off for various reasons.

Given that, this PR removes the integration as one that is officially
supported by the Astro core team. Interested community members are
encouraged to fork the integration and continue the development in
another repository.

* Remove e2e tests and examples

* Update lockfile

* Remove ssr-lit.test.js

* Remove error for no client entrypoint

* Remove auto selection of the Lit renderer

* Remove lit package.json

* Remove lit fixture

1 files changed, 0 insertions, 118 deletions

diff --git a/packages/integrations/lit/server.js b/packages/integrations/lit/server.js
deleted file mode 100644
index d1da3c6c9..000000000
--- a/packages/integrations/lit/server.js
+++ /dev/null
@@ -1,118 +0,0 @@
-// Separate import from the rest so it doesn't get re-organized after other imports
-import './server-shim.js';
-
-import { LitElementRenderer } from '@lit-labs/ssr/lib/lit-element-renderer.js';
-import * as parse5 from 'parse5';
-
-function isCustomElementTag(name) {
-	return typeof name === 'string' && name.includes('-');
-}
-
-function getCustomElementConstructor(name) {
-	if (typeof customElements !== 'undefined' && isCustomElementTag(name)) {
-		return customElements.get(name) || null;
-	} else if (typeof name === 'function') {
-		return name;
-	}
-	return null;
-}
-
-async function isLitElement(Component) {
-	const Ctr = getCustomElementConstructor(Component);
-	return !!Ctr?._$litElement$;
-}
-
-async function check(Component) {
-	// Lit doesn't support getting a tagName from a Constructor at this time.
-	// So this must be a string at the moment.
-	return !!(await isLitElement(Component));
-}
-
-function* render(Component, attrs, slots) {
-	let tagName = Component;
-	if (typeof tagName !== 'string') {
-		tagName = Component[Symbol.for('tagName')];
-	}
-	const instance = new LitElementRenderer(tagName);
-
-	// LitElementRenderer creates a new element instance, so copy over.
-	const Ctr = getCustomElementConstructor(tagName);
-	let shouldDeferHydration = false;
-
-	if (attrs) {
-		for (let [name, value] of Object.entries(attrs)) {
-			const isReactiveProperty = name in Ctr.prototype;
-			const isReflectedReactiveProperty = Ctr.elementProperties.get(name)?.reflect;
-
-			// Only defer hydration if we are setting a reactive property that cannot
-			// be reflected / serialized as a property.
-			shouldDeferHydration ||= isReactiveProperty && !isReflectedReactiveProperty;
-
-			if (isReactiveProperty) {
-				instance.setProperty(name, value);
-			} else {
-				instance.setAttribute(name, value);
-			}
-		}
-	}
-
-	instance.connectedCallback();
-
-	yield `<${tagName}${shouldDeferHydration ? ' defer-hydration' : ''}`;
-	yield* instance.renderAttributes();
-	yield `>`;
-	const shadowContents = instance.renderShadow({
-		elementRenderers: [LitElementRenderer],
-		customElementInstanceStack: [instance],
-		customElementHostStack: [instance],
-		deferHydration: false,
-	});
-	if (shadowContents !== undefined) {
-		const { mode = 'open', delegatesFocus } = instance.shadowRootOptions ?? {};
-		// `delegatesFocus` is intentionally allowed to coerce to boolean to
-		// match web platform behavior.
-		const delegatesfocusAttr = delegatesFocus ? ' shadowrootdelegatesfocus' : '';
-		yield `<template shadowroot="${mode}" shadowrootmode="${mode}"${delegatesfocusAttr}>`;
-		yield* shadowContents;
-		yield '</template>';
-	}
-	if (slots) {
-		for (let [slot, value = ''] of Object.entries(slots)) {
-			if (slot !== 'default' && value) {
-				// Parse the value as a concatenated string
-				const fragment = parse5.parseFragment(`${value}`);
-
-				// Add the missing slot attribute to child Element nodes
-				for (const node of fragment.childNodes) {
-					if (node.tagName && !node.attrs.some(({ name }) => name === 'slot')) {
-						node.attrs.push({ name: 'slot', value: slot });
-					}
-				}
-
-				value = parse5.serialize(fragment);
-			}
-
-			yield value;
-		}
-	}
-	yield `</${tagName}>`;
-}
-
-async function renderToStaticMarkup(Component, props, slots) {
-	let tagName = Component;
-
-	let out = '';
-	for (let chunk of render(tagName, props, slots)) {
-		out += chunk;
-	}
-
-	return {
-		html: out,
-	};
-}
-
-export default {
-	name: '@astrojs/lit',
-	check,
-	renderToStaticMarkup,
-};