fix: undefined string is returned as base path if server object is incorrect (has no url property)

Author: b41ex

src/utils.ts

@@ -324,6 +324,10 @@ export const extractOperationBasePath = (servers?: OpenAPIV3.ServerObject[]): st
   try {
     const [firstServer] = servers
     let serverUrl = firstServer.url
+    if(!serverUrl) {
+      return ''
+    }
+    
     const { variables = {} } = firstServer
 
     for (const param of Object.keys(variables)) {

test/utils.test.ts

@@ -50,5 +50,12 @@ describe('Unit test for extractOperationBasePath', () => {
     expect(extractOperationBasePath([{ url: '/v1/' }])).toEqual('/v1')
     expect(extractOperationBasePath([{ url: '/' }])).toEqual('')
   })
+
+  // todo: should really handle this case in api-unifier, it returns incorrect object in this case,
+  // since url is required for server object
+  test('Should handle Servers with empty url correctly', () => {
+    // @ts-expect-error - Testing edge case with missing url property
+    expect(extractOperationBasePath([{ }])).toEqual('')
+  })
 })