Minor readability enhancements (#1313)

* Minor readability enhancements

* Split unwieldly ApiBase

* Fix import case

* Some movements, init in root

* Simplify overloaded functions

* Some more reworks

* Hoist non-class functions

* Flatten

* Split decorate and init

* Split meta from chain

* getNext cleanup

packages/rpc-core/src/index.ts

@@ -269,7 +269,7 @@ export default class Rpc implements RpcInterface {
   }
 
   private formatOutput (method: RpcMethod, params: Codec[], result?: any): Codec | (Codec | null | undefined)[] {
-    const base = createTypeUnsafe(method.type as string, [result]);
+    const base = createTypeUnsafe(method.type, [result]);
 
     if (method.type === 'StorageData') {
       const key = params[0] as StorageKey;