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>

1 files changed, 32 insertions, 4 deletions

diff --git a/packages/integrations/svelte/client.js b/packages/integrations/svelte/client.js
index 3f401b544..36a8e8de1 100644
--- a/packages/integrations/svelte/client.js
+++ b/packages/integrations/svelte/client.js
@@ -1,15 +1,43 @@
-import SvelteWrapper from './Wrapper.svelte';
+const noop = () => {};
 
 export default (target) => {
-	return (component, props, children, { client }) => {
+	return (Component, props, slotted, { client }) => {
 		if (!target.hasAttribute('ssr')) return;
 		delete props['class'];
+		const slots = {};
+		for (const [key, value] of Object.entries(slotted)) {
+			slots[key] = createSlotDefinition(key, value);
+		}
 		try {
-			new SvelteWrapper({
+			new Component({
 				target,
-				props: { __astro_component: component, __astro_children: children, ...props },
+				props: { 
+					...props,
+					$$slots: slots,
+					$$scope: { ctx: [] }
+				},
 				hydrate: client !== 'only',
+				$$inline: true,
 			});
 		} catch (e) {}
 	};
 };
+
+function createSlotDefinition(key, children) {
+  return [
+    () => ({
+			// mount
+			m(target) {
+				target.insertAdjacentHTML('beforeend', `<astro-slot${key === 'default' ? '' : ` name="${key}"`}>${children}</astro-slot>`)
+			},
+			// create
+			c: noop,
+			// hydrate
+			l: noop,
+			// destroy
+			d: noop,
+		}),
+    noop,
+    noop,
+  ]
+}