fix/correctly-infer-optional-query-parameters

Author: johannesmartikkala

src/types.ts

@@ -124,10 +124,16 @@ type _CreateFetch<OP, Q = never> = [Q] extends [never]
   : (query: Q) => TypedFetch<OP>
 
 export type CreateFetch<M, OP> = M extends 'post' | 'put' | 'patch' | 'delete'
-  ? OP extends { parameters: { query: infer Q } }
-    ? _CreateFetch<OP, { [K in keyof Q]: true | 1 }>
+  ? OP extends {
+      parameters: {
+          query?: infer Q;
+      };
+  }
+    ? [keyof Q] extends [never]
+      ? _CreateFetch<OP>
+      : _CreateFetch<OP, { [K in keyof Q]: true | 1; }>
     : _CreateFetch<OP>
-  : _CreateFetch<OP>
+  : _CreateFetch<OP>;
 
 export type Middleware = (
   url: string,