(fix) sourcemap when no script tag

packages/language-server/src/plugins/typescript/DocumentSnapshot.ts

@@ -287,12 +287,14 @@ export class SvelteDocumentSnapshot implements DocumentSnapshot {
     private async getMapper(uri: string) {
         const scriptInfo = this.parent.scriptInfo || this.parent.moduleScriptInfo;
 
-        if (!scriptInfo) {
-            return new IdentityMapper(uri);
-        }
         if (!this.tsxMap) {
+            if (!scriptInfo) {
+                return new IdentityMapper(uri);
+            }
+
             return new FragmentMapper(this.parent.getText(), scriptInfo, uri);
         }
+
         return new ConsumerDocumentMapper(
             await new SourceMapConsumer(this.tsxMap),
             uri,

packages/language-server/test/plugins/typescript/features/diagnostics/fixtures/checkjs/no-script-tag/expected.json

@@ -0,0 +1,19 @@
+[
+    {
+        "code": 2304,
+        "message": "Cannot find name 'hi'.",
+        "range": {
+            "end": {
+                "character": 7,
+                "line": 1
+            },
+            "start": {
+                "character": 5,
+                "line": 1
+            }
+        },
+        "severity": 1,
+        "source": "js",
+        "tags": []
+    }
+]

packages/language-server/test/plugins/typescript/features/diagnostics/fixtures/checkjs/no-script-tag/input.svelte

@@ -0,0 +1,3 @@
+<div>
+    {hi}
+</div>