stargate: Update PrivateStargateClient type

packages/stargate/src/stargateclient.spec.ts

@@ -45,7 +45,7 @@ describe("StargateClient", () => {
       pendingWithoutSimapp();
       const client = await StargateClient.connect(simapp.tendermintUrl);
       const openedClient = (client as unknown) as PrivateStargateClient;
-      const getCodeSpy = spyOn(openedClient.tmClient, "status").and.callThrough();
+      const getCodeSpy = spyOn(openedClient.tmClient!, "status").and.callThrough();
 
       expect(await client.getChainId()).toEqual(simapp.chainId); // from network
       expect(await client.getChainId()).toEqual(simapp.chainId); // from cache

packages/stargate/src/stargateclient.ts

@@ -110,7 +110,7 @@ export function coinFromProto(input: Coin): Coin {
 
 /** Use for testing only */
 export interface PrivateStargateClient {
-  readonly tmClient: Tendermint34Client;
+  readonly tmClient: Tendermint34Client | undefined;
 }
 
 export class StargateClient {