Enable named slots in renderers (#3652)

* feat: pass all slots to renderers

* refactor: pass `slots` as top-level props

* test: add named slot test for frameworks

* fix: nested hydration, slots that are not initially rendered

* test: add nested-recursive e2e test

* fix: render unmatched custom element children

* chore: update lockfile

* fix: unrendered slots for client:only

* fix(lit): ensure lit integration uses new slots API

* chore: add changeset

* chore: add changesets

* fix: lit slots

* feat: convert dash-case or snake_case slots to camelCase for JSX

* feat: remove tmpl special logic

* test: add slot components-in-markdown test

* refactor: prefer Object.entries.map() to for/of loop

Co-authored-by: Nate Moore <nate@astro.build>

3 files changed, 9 insertions, 8 deletions

diff --git a/packages/integrations/vue/client.js b/packages/integrations/vue/client.js
index c6206fe51..648a69658 100644
--- a/packages/integrations/vue/client.js
+++ b/packages/integrations/vue/client.js
@@ -2,15 +2,15 @@ import { h, createSSRApp, createApp } from 'vue';
 import StaticHtml from './static-html.js';
 
 export default (element) =>
-	(Component, props, children, { client }) => {
+	(Component, props, slotted, { client }) => {
 		delete props['class'];
 		if (!element.hasAttribute('ssr')) return;
 
 		// Expose name on host component for Vue devtools
 		const name = Component.name ? `${Component.name} Host` : undefined;
 		const slots = {};
-		if (children != null) {
-			slots.default = () => h(StaticHtml, { value: children });
+		for (const [key, value] of Object.entries(slotted)) {
+			slots[key] = () => h(StaticHtml, { value, name: key === 'default' ? undefined : key });
 		}
 		if (client === 'only') {
 			const app = createApp({ name, render: () => h(Component, props, slots) });
diff --git a/packages/integrations/vue/server.js b/packages/integrations/vue/server.js
index 1ae2b757b..883aa4de0 100644
--- a/packages/integrations/vue/server.js
+++ b/packages/integrations/vue/server.js
@@ -6,10 +6,10 @@ function check(Component) {
 	return !!Component['ssrRender'];
 }
 
-async function renderToStaticMarkup(Component, props, children) {
+async function renderToStaticMarkup(Component, props, slotted) {
 	const slots = {};
-	if (children != null) {
-		slots.default = () => h(StaticHtml, { value: children });
+	for (const [key, value] of Object.entries(slotted)) {
+		slots[key] = () => h(StaticHtml, { value, name: key === 'default' ? undefined : key });
 	}
 	const app = createSSRApp({ render: () => h(Component, props, slots) });
 	const html = await renderToString(app);
diff --git a/packages/integrations/vue/static-html.js b/packages/integrations/vue/static-html.js
index ff1459b6f..a7f09eace 100644
--- a/packages/integrations/vue/static-html.js
+++ b/packages/integrations/vue/static-html.js
@@ -9,10 +9,11 @@ import { h, defineComponent } from 'vue';
 const StaticHtml = defineComponent({
 	props: {
 		value: String,
+		name: String,
 	},
-	setup({ value }) {
+	setup({ name, value }) {
 		if (!value) return () => null;
-		return () => h('astro-fragment', { innerHTML: value });
+		return () => h('astro-slot', { name, innerHTML: value });
 	},
 });