wip: add tests and allow top level await

Author: baseballyama

tests/fixtures/parser/ast/issue338-eslint-plugin-svelte-output.json

@@ -940,7 +940,7 @@
       }
     },
     {
-      "type": "Keyword",
+      "type": "Null",
       "value": "null",
       "range": [
         46,
@@ -976,7 +976,7 @@
       }
     },
     {
-      "type": "Keyword",
+      "type": "Null",
       "value": "null",
       "range": [
         53,
@@ -1516,7 +1516,7 @@
       }
     },
     {
-      "type": "Keyword",
+      "type": "Null",
       "value": "null",
       "range": [
         136,

tests/fixtures/parser/ast/svelte5/async/_config.json

@@ -0,0 +1,13 @@
+{
+  "svelteConfig": {
+    "compilerOptions": {
+      "experimental": {
+        "async": true
+      }
+    }
+  },
+  "parserOptions": {
+    "ecmaVersion": 2022,
+    "sourceType": "module"
+  }
+}

tests/fixtures/parser/ast/svelte5/async/boundaries-input.svelte

@@ -0,0 +1,11 @@
+<script>
+	import MyApp from './MyApp.svelte';
+</script>
+
+<svelte:boundary>
+	<MyApp />
+
+	{#snippet pending()}
+		<p>loading...</p>
+	{/snippet}
+</svelte:boundary>