add support for fetch (naive) response type

src/types/Anilist.ts

@@ -1,5 +1,26 @@
 import { type AuthorizationError } from "../utils/AuthorizationError.ts"
 import { ResponseError } from "../utils/ResponseError.ts"
+import { Mutation, Query } from "./generated/graphql.ts"
+
+type Primitive = string | Function | number | boolean | Symbol | undefined | null
+
+/** Deeply omit members of an array of interface or array of type. */
+export type DeepOmitArray<T extends any[], K> = {
+  [P in keyof T]: DeepOmit<T[P], K>
+}
+
+/**
+ * Deeply omit members of an interface or type.
+ * https://gist.github.com/ahuggins-nhs/826906a58e4c1e59306bc0792e7826d1?permalink_comment_id=4498424#gistcomment-4498424
+ */
+type DeepOmit<T, K> = T extends Primitive ? T : {
+  [P in Exclude<keyof T, K>]: //extra level of indirection needed to trigger homomorhic behavior
+    T[P] extends infer TP // distribute over unions
+      ? TP extends Primitive ? TP // leave primitives and functions alone
+      : TP extends any[] ? DeepOmitArray<TP, K> // Array special handling
+      : DeepOmit<TP, K>
+      : never
+}
 
 export type Fields<in Q extends (...args: any) => any> = {
   operation: ReturnType<Q>
@@ -47,6 +68,6 @@ export type Fetch = {
     init: { query: string; token?: string },
   ): Promise<Response | ResponseError>
 }
-export type Response<T = Record<string, any>> = {
-  data: T
+export type Response = {
+  data: DeepOmit<Query & Mutation, "__typename">
 }

src/utils/ResponseError.ts

@@ -4,7 +4,7 @@ export type ResponseError = {
     status: number
     locations: Array<Record<"line" | "column", number>>
   }>
-  data: Record<string, unknown>
+  data: Record<string, null>
 }
 
 export const ResponseError = class extends Error {