adding tests

Author: baseballyama

tests/fixtures/parser/ast/svelte5/ts-event07-input.svelte

@@ -0,0 +1,10 @@
+<script lang="ts">
+	let count = $state(0);
+</script>
+
+<button
+	on:click={(e: MouseEvent) => {
+		const next: number = count + 1;
+		count = next;
+	}}
+>clicks: {count}</button>

tests/fixtures/parser/ast/svelte5/ts-event07-no-unused-vars-result.json

@@ -0,0 +1,8 @@
+[
+  {
+    "ruleId": "no-unused-vars",
+    "code": "e: MouseEvent",
+    "line": 6,
+    "column": 13
+  }
+]