refactor: create the IClientVerifyingProvider child interface and add rpcCall to the client Client instead of exposing the provider in a getter

src/client/client.ts

@@ -13,10 +13,11 @@ import {
   optimisticUpdateVerify,
 } from "#util.js";
 import { equalBytes } from "@noble/curves/abstract/utils.js";
+import { IClientVerifyingProvider } from "#client/verifyingProvider.js";
 
 interface Config extends BaseClientOptions {
   prover: IClientProver;
-  provider: IVerifyingProviderConstructor;
+  provider: IVerifyingProviderConstructor<IClientVerifyingProvider>;
   rpcHandler: Function;
 }
 
@@ -27,16 +28,12 @@ export default class Client extends BaseClient {
     super(options);
   }
 
-  private _provider?: IVerifyingProvider;
-
-  get provider(): IVerifyingProvider {
-    return this._provider as IVerifyingProvider;
-  }
+  private provider?: IClientVerifyingProvider;
 
   async sync(): Promise<void> {
     await super.sync();
 
-    if (!this._provider) {
+    if (!this.provider) {
       const { blockHash, blockNumber } = await this.getNextValidExecutionInfo();
       const factory = this.options.provider;
       const provider = new factory(
@@ -51,7 +48,7 @@ export default class Client extends BaseClient {
         provider.update(ei.blockNumber, ei.blockHash);
       });
 
-      this._provider = provider;
+      this.provider = provider;
       this.booted = true;
     }
   }
@@ -123,4 +120,8 @@ export default class Client extends BaseClient {
 
     return committee;
   }
+
+  public async rpcCall(method: string, params: any) {
+    return this.provider?.rpcMethod(method, params);
+  }
 }

src/client/verifyingProvider.ts

@@ -48,7 +48,11 @@ import { keccak256 } from "ethereum-cryptography/keccak";
 import { fromHexString } from "@chainsafe/ssz";
 import { RPC } from "#client/rpc.js";
 
-export default class VerifyingProvider implements IVerifyingProvider {
+export interface IClientVerifyingProvider extends IVerifyingProvider {
+  rpcMethod(method: string, params: any);
+}
+
+export default class VerifyingProvider implements IClientVerifyingProvider {
   common: Common;
   vm: VM | null = null;
   private blockHashes: { [blockNumberHex: string]: Bytes32 } = {};