fix: definition request crashing on getting span (#574)

typescript-language-server · Aug 25, 2022 · 4e1c82b · 4e1c82b
1 parent f1b5270
commit 4e1c82b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/lsp-server.ts b/src/lsp-server.ts
@@ -558,7 +558,8 @@ export class LspServer {
             if (response.type !== 'response' || !response.body) {
                 return undefined;
             }
-            const span = Range.fromTextSpan(response.body.textSpan);
+            // `textSpan` can be undefined in older TypeScript versions, despite type saying otherwise.
+            const span = response.body.textSpan ? Range.fromTextSpan(response.body.textSpan) : undefined;
             return response.body.definitions
                 .map((location): lsp.DefinitionLink => {
                     const target = toLocation(location, this.documents);