fix(overmind): fix derived typing and rename statemachine class

Author: christianalfoni

packages/node_modules/overmind/src/statemachine.ts

@@ -18,7 +18,7 @@ export type Statemachine<States extends string> = {
 
 const CURRENT_EXIT = Symbol('CURRENT_EXIT')
 
-class Machine<States extends string>  {
+class StateMachine<States extends string>  {
   current: States
   private [CURRENT_EXIT]: (() => void) | undefined
   constructor(definition: StatemachineDefinition<States>) {
@@ -47,5 +47,5 @@ class Machine<States extends string>  {
 }
 
 export function statemachine<States extends string>(definition: StatemachineDefinition<States>): Statemachine<States> {
-  return new Machine(definition) as any
+  return new StateMachine(definition) as any
 }

packages/node_modules/overmind/src/types.ts

@@ -81,7 +81,7 @@ export type IDerive<
   Value
 > = (
   parent: ResolveState<Parent>,
-  state: ResolveState<ThisConfig['state'] & {}>
+  state: ResolveState<ThisConfig['state']>
 ) => Value
 
 export interface IOnInitialize<ThisConfig extends IConfiguration> {