fix: support TS satisfies operator (#10068)

fixes #9606

Author: dummdidumm

.changeset/light-humans-hang.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: support TypeScript's `satisfies` operator

packages/svelte/package.json

@@ -117,7 +117,7 @@
     "@ampproject/remapping": "^2.2.1",
     "@jridgewell/sourcemap-codec": "^1.4.15",
     "acorn": "^8.10.0",
-    "acorn-typescript": "^1.4.11",
+    "acorn-typescript": "^1.4.13",
     "aria-query": "^5.3.0",
     "axobject-query": "^4.0.0",
     "esm-env": "^1.0.0",

packages/svelte/src/compiler/phases/1-parse/acorn.js

@@ -2,7 +2,7 @@ import * as acorn from 'acorn';
 import { walk } from 'zimmerframe';
 import { tsPlugin } from 'acorn-typescript';
 
-const ParserWithTS = acorn.Parser.extend(tsPlugin());
+const ParserWithTS = acorn.Parser.extend(tsPlugin({ allowSatisfies: true }));
 
 /**
  * @param {string} source

packages/svelte/src/compiler/phases/3-transform/typescript.js

@@ -41,13 +41,16 @@ export const remove_types = {
 	TSAsExpression(node, context) {
 		return context.visit(node.expression);
 	},
+	TSSatisfiesExpression(node, context) {
+		return context.visit(node.expression);
+	},
 	TSNonNullExpression(node, context) {
 		return context.visit(node.expression);
 	},
-	TSInterfaceDeclaration(node, context) {
+	TSInterfaceDeclaration() {
 		return b.empty;
 	},
-	TSTypeAliasDeclaration(node, context) {
+	TSTypeAliasDeclaration() {
 		return b.empty;
 	}
 };

packages/svelte/tests/runtime-runes/samples/typescript/main.svelte

@@ -10,6 +10,9 @@
 	import { type Bar, type Baz } from './types';
 
 	let count = $state(0);
+	const person = {
+		message: 'goodbye'
+	} satisfies Goodbye;
 </script>
 
 <button