fix(mcp): keep McpOptions assignable to OAuthOptions under exactOptionalPropertyTypes (#11635)

.changeset/mcp-options-exact-optional-property-types.md

@@ -0,0 +1,5 @@
+---
+"@better-auth/mcp": patch
+---
+
+Projects that enable `exactOptionalPropertyTypes` with `skipLibCheck: false` no longer get a TS2430 error from the `@better-auth/mcp` type declarations.

packages/mcp/src/plugin.ts

@@ -41,9 +41,9 @@ export interface McpOptions extends OAuthOptions<Scope[]> {
 	 *
 	 * @default 30
 	 */
-	refreshTokenReuseInterval?: OAuthOptions<
-		Scope[]
-	>["refreshTokenReuseInterval"];
+	refreshTokenReuseInterval?: NonNullable<
+		OAuthOptions<Scope[]>["refreshTokenReuseInterval"]
+	>;
 	/**
 	 * The canonical protected resource identifier (RFC 8707 / RFC 9728) for this
 	 * MCP server. Issued tokens are audience-bound to it, and it is published as