Allow RpcRequest params to be of any type, instead of requiring an array (#2751)

This provides flexibility for APIs that do not use an array of params

Author: mcintyre94

.changeset/unlucky-pumpkins-itch.md

@@ -0,0 +1,5 @@
+---
+"@solana/rpc-spec": patch
+---
+
+Allow Rpc Request params to be any type, instead of requiring an array

packages/rpc-spec/src/rpc-api.ts

@@ -3,7 +3,7 @@ import { Callable } from '@solana/rpc-spec-types';
 import { RpcRequest } from './rpc-request';
 
 export type RpcApiConfig = Readonly<{
-    parametersTransformer?: <T extends unknown[]>(params: T, methodName: string) => unknown[];
+    parametersTransformer?: <T extends unknown[]>(params: T, methodName: string) => unknown;
     responseTransformer?: <T>(response: unknown, methodName: string) => T;
 }>;
 

packages/rpc-spec/src/rpc-request.ts

@@ -1,6 +1,6 @@
 export type RpcRequest<TResponse> = {
     methodName: string;
-    params: unknown[];
+    params: unknown;
     responseTransformer?: (response: unknown, methodName: string) => TResponse;
 };