Return empty string if no server provided (#2878)

.changeset/chatty-apricots-laugh.md

@@ -0,0 +1,5 @@
+---
+'@gitbook/react-openapi': patch
+---
+
+Return empty string if no server provided

packages/react-openapi/src/util/server.test.ts

@@ -50,9 +50,9 @@ describe('#getDefaultServerURL', () => {
         expect(result).toBe('https://user.example.com/v1');
     });
 
-    it('returns null if no servers are provided', () => {
+    it('returns empty string if no servers are provided', () => {
         const servers: OpenAPIV3.ServerObject[] = [];
         const result = getDefaultServerURL(servers);
-        expect(result).toBeNull();
+        expect(result).toBe('');
     });
 });

packages/react-openapi/src/util/server.ts

@@ -3,10 +3,11 @@ import { OpenAPIV3 } from '@gitbook/openapi-parser';
 /**
  * Get the default URL for the server.
  */
-export function getDefaultServerURL(servers: OpenAPIV3.ServerObject[]): null | string {
+export function getDefaultServerURL(servers: OpenAPIV3.ServerObject[]): string {
     const server = servers[0];
     if (!server) {
-        return null;
+        // Return empty string if no server is found to display nothing
+        return '';
     }
 
     return interpolateServerURL(server);