fix(client): a client with more plugins fits a narrower client type again (#10907)

Co-authored-by: Taesu <bytaesu@gmail.com>

.changeset/hydrate-session-variance.md

@@ -0,0 +1,5 @@
+---
+"better-auth": patch
+---
+
+A client created with more plugins is again assignable to a client type declaring fewer plugins, as in 1.6.

packages/better-auth/src/client/client.test.ts

@@ -17,6 +17,7 @@ import {
 	organizationClient,
 	twoFactorClient,
 } from "./plugins";
+import type { ReactAuthClient } from "./react";
 import { createAuthClient as createReactClient } from "./react";
 import { createAuthClient as createSolidClient } from "./solid";
 import { createAuthClient as createSvelteClient } from "./svelte";
@@ -419,6 +420,19 @@ describe("run time proxy", async () => {
 });
 
 describe("type", () => {
+	/**
+	 * @see https://github.com/better-auth/better-auth/issues/10897
+	 */
+	it("keeps a client with more plugins assignable to a client type with fewer plugins", () => {
+		type EmailOtpClient = ReactAuthClient<{
+			plugins: [ReturnType<typeof emailOTPClient>];
+		}>;
+		const client = createReactClient({
+			plugins: [emailOTPClient(), adminClient()],
+		});
+		expectTypeOf(client).toMatchTypeOf<EmailOtpClient>();
+	});
+
 	it("should not infer non-action endpoints", () => {
 		const client = createReactClient({
 			plugins: [testClientPlugin()],

packages/better-auth/src/client/lynx/index.ts

@@ -60,9 +60,7 @@ export type LynxAuthClient<Option extends BetterAuthClientOptions> =
 	UnionToIntersection<InferResolvedHooks<Option>> &
 		InferClientAPI<Option> &
 		InferActions<Option> & {
-			hydrateSession: (
-				session: NonNullable<ClientSession<Option>> | null,
-			) => void;
+			hydrateSession(session: NonNullable<ClientSession<Option>> | null): void;
 			useSession: () => {
 				data: ClientSession<Option>;
 				isPending: boolean;

packages/better-auth/src/client/react/index.ts

@@ -60,9 +60,7 @@ export type ReactAuthClient<Option extends BetterAuthClientOptions> =
 	UnionToIntersection<InferResolvedHooks<Option>> &
 		InferClientAPI<Option> &
 		InferActions<Option> & {
-			hydrateSession: (
-				session: NonNullable<ClientSession<Option>> | null,
-			) => void;
+			hydrateSession(session: NonNullable<ClientSession<Option>> | null): void;
 			useSession: () => {
 				data: ClientSession<Option>;
 				isPending: boolean;

packages/better-auth/src/client/solid/index.ts

@@ -61,9 +61,7 @@ export type SolidAuthClient<Option extends BetterAuthClientOptions> =
 	UnionToIntersection<InferResolvedHooks<Option>> &
 		InferClientAPI<Option> &
 		InferActions<Option> & {
-			hydrateSession: (
-				session: NonNullable<ClientSession<Option>> | null,
-			) => void;
+			hydrateSession(session: NonNullable<ClientSession<Option>> | null): void;
 			useSession: () => Accessor<{
 				data: ClientSession<Option>;
 				isPending: boolean;

packages/better-auth/src/client/svelte/index.ts

@@ -56,9 +56,7 @@ export type SvelteAuthClient<Option extends BetterAuthClientOptions> =
 	UnionToIntersection<InferResolvedHooks<Option>> &
 		InferClientAPI<Option> &
 		InferActions<Option> & {
-			hydrateSession: (
-				session: NonNullable<ClientSession<Option>> | null,
-			) => void;
+			hydrateSession(session: NonNullable<ClientSession<Option>> | null): void;
 			useSession: () => Atom<{
 				data: ClientSession<Option>;
 				error: BetterFetchError | null;

packages/better-auth/src/client/vanilla.ts

@@ -56,9 +56,7 @@ export type AuthClient<Option extends BetterAuthClientOptions> =
 	UnionToIntersection<InferResolvedHooks<Option>> &
 		InferClientAPI<Option> &
 		InferActions<Option> & {
-			hydrateSession: (
-				session: NonNullable<ClientSession<Option>> | null,
-			) => void;
+			hydrateSession(session: NonNullable<ClientSession<Option>> | null): void;
 			useSession: Atom<{
 				data: ClientSession<Option>;
 				error: BetterFetchError | null;

packages/better-auth/src/client/vue/index.ts

@@ -88,9 +88,7 @@ export type VueAuthClient<Option extends BetterAuthClientOptions> =
 	UnionToIntersection<InferResolvedHooks<Option>> &
 		InferClientAPI<Option> &
 		InferActions<Option> & {
-			hydrateSession: (
-				session: NonNullable<ClientSession<Option>> | null,
-			) => void;
+			hydrateSession(session: NonNullable<ClientSession<Option>> | null): void;
 			useSession: VueUseSession<Option>;
 			$Infer: {
 				Session: NonNullable<ClientSession<Option>>;