fix: allow accessing snippet in script tag

Author: paoloricciuti

.changeset/few-horses-wink.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: allow accessing snippet in script tag

packages/svelte/src/compiler/phases/3-transform/server/visitors/SnippetBlock.js

@@ -1,4 +1,4 @@
-/** @import { ArrowFunctionExpression, BlockStatement, CallExpression } from 'estree' */
+/** @import { ArrowFunctionExpression, BlockStatement, CallExpression, Statement } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
 import { dev } from '../../../../state.js';
@@ -15,21 +15,24 @@ export function SnippetBlock(node, context) {
 		body.body.unshift(b.stmt(b.call('$.validate_snippet_args', b.id('$$payload'))));
 	}
 
-	/** @type {ArrowFunctionExpression | CallExpression} */
-	let fn = b.arrow([b.id('$$payload'), ...node.parameters], body);
+	let fn = b.function_declaration(
+		node.expression,
+		[b.id('$$payload'), ...node.parameters],
+		/** @type {BlockStatement} */ (context.visit(node.body))
+	);
+
+	const push_to = node.metadata.can_hoist ? context.state.hoisted : context.state.init;
 
 	if (dev) {
-		fn = b.call('$.prevent_snippet_stringification', fn);
+		push_to.push(b.stmt(b.call('$.prevent_snippet_stringification', fn.id)));
 	}
 
-	const declaration = b.declaration('const', [b.declarator(node.expression, fn)]);
-
 	// @ts-expect-error - TODO remove this hack once $$render_inner for legacy bindings is gone
 	fn.___snippet = true;
 
 	if (node.metadata.can_hoist) {
-		context.state.hoisted.push(declaration);
+		push_to.push(fn);
 	} else {
-		context.state.init.push(declaration);
+		push_to.push(fn);
 	}
 }

packages/svelte/tests/runtime-runes/samples/access-snippet-in-script/_config.js

@@ -0,0 +1,7 @@
+import { test } from '../../test';
+
+export default test({
+	compileOptions: {
+		dev: true
+	}
+});

packages/svelte/tests/runtime-runes/samples/access-snippet-in-script/fn.js

@@ -0,0 +1,3 @@
+export function fn(snippet) {
+	return snippet;
+}

packages/svelte/tests/runtime-runes/samples/access-snippet-in-script/main.svelte

@@ -0,0 +1,10 @@
+<script>
+	import { fn } from "./fn.js";
+	let variable = $state("var");
+
+	fn(test);
+</script>
+
+{#snippet test()}
+	{variable}
+{/snippet}

svelte-renderer-api

@@ -0,0 +1 @@
+Subproject commit 97817a95d6fa2d3f72c03f04a1e0882a7650cd16