fix: allow custom body properties

Author: Bekacru

packages/better-auth/src/client/path-to-object.ts

@@ -6,7 +6,6 @@ import type { Context, Endpoint } from "better-call";
 import type {
 	HasRequiredKeys,
 	Prettify,
-	StripEmptyObjects,
 	UnionToIntersection,
 } from "../types/helper";
 import type {
@@ -76,27 +75,6 @@ export type InferCtx<
 
 export type MergeRoutes<T> = UnionToIntersection<T>;
 
-export type InferReturn<R, O extends ClientOptions> = R extends Record<
-	string,
-	any
->
-	? StripEmptyObjects<
-			{
-				user: R extends { user: any } ? InferUserFromClient<O> : never;
-				users: R extends { users: any[] } ? InferUserFromClient<O>[] : never;
-				session: R extends { session: any } ? InferSessionFromClient<O> : never;
-				sessions: R extends { sessions: any[] }
-					? InferSessionFromClient<O>[]
-					: never;
-			} & {
-				[key in Exclude<
-					keyof R,
-					"user" | "users" | "session" | "sessions"
-				>]: R[key];
-			}
-		>
-	: R;
-
 export type InferRoute<API, COpts extends ClientOptions> = API extends Record<
 	string,
 	infer T
@@ -116,8 +94,8 @@ export type InferRoute<API, COpts extends ClientOptions> = API extends Record<
 						? C extends Context<any, any>
 							? <
 									FetchOptions extends BetterFetchOption<
-										C["body"],
-										C["query"],
+										C["body"] & Record<string, any>,
+										C["query"] & Record<string, any>,
 										C["params"]
 									>,
 								>(