feat(overmind): return instance from send

Author: christianalfoni

packages/node_modules/overmind/src/statemachine.ts

@@ -25,7 +25,7 @@ export interface MachineMethods<States extends TState, Events extends TEvents> {
   ): Statemachine<States extends { current: T} ? States : never, Events> | undefined
   send<T extends Events["type"]>(
     ...args: Events extends { type: T, data: any } ? [T, Events["data"]] : [T]
-  ): Statemachine<States extends { current: T} ? States : never, Events> | undefined
+  ): Statemachine<States extends { current: T} ? States : never, Events>
 }
 
 export type Statemachine<States extends TState, Events extends TEvents> = States & MachineMethods<States, Events>
@@ -63,7 +63,7 @@ export class StateMachine<State extends TState, Events extends TEvents>  {
       if (process.env.NODE_ENV === 'development') {
         console.warn(`Overmind - The statemachine at "${this[PATH]}" has been disposed, but you tried to transition on it`)
       }
-      return
+      return this
     }
 
     const transition = this[VALUE][TRANSITIONS][type]
@@ -74,7 +74,7 @@ export class StateMachine<State extends TState, Events extends TEvents>  {
       this.current = result
     }
 
-    return
+    return this
   }
   matches(state: any) {
     if (this.current === state) {