feat(overmind): return transition object instead of string

Author: christianalfoni

packages/node_modules/overmind/src/statemachine.test.ts

@@ -184,7 +184,7 @@ describe('Statemachine', () => {
 
     const state = statemachine<States>({
       FOO: ['BAR'],
-      BAR: () => 'FOO'
+      BAR: () => ({ current: 'FOO' })
     }).create({
       current: 'FOO'
     })

packages/node_modules/overmind/src/statemachine.ts

@@ -1,3 +1,4 @@
+import isPlainObject from 'is-plain-obj'
 import { PATH, PROXY_TREE, VALUE } from 'proxy-state-tree'
 
 import { deepCopy } from './utils'
@@ -10,7 +11,7 @@ type TStates = {
 }
 
 export type StatemachineTransitions<States extends TStates, BaseState extends IState> = {
-  [State in States["current"]]: Array<States["current"]> | ((payload: Omit<States extends { current: State } ? States & Partial<BaseState> : never, 'current'>, state: Statemachine<States, BaseState>) =>  States["current"] | Array<States["current"]> | boolean)
+  [State in States["current"]]: Array<States["current"]> | ((payload: Omit<States extends { current: State } ? States & Partial<BaseState> : never, 'current'>, state: Statemachine<States, BaseState>) =>  States | Array<States["current"]> | boolean)
 }
 
 export interface MachineMethods<States extends TStates, Base extends IState> {
@@ -96,9 +97,9 @@ export class StateMachine<Base extends IState, States extends TStates>  {
       }
 
 
-      if (typeof dynamicResult === 'string') {
-        this[VALUE][CURRENT_DYNAMIC_TRANSITION] = [dynamicResult]
-        return this.transition({ current: dynamicResult })
+      if (isPlainObject(dynamicResult)) {
+        this[VALUE][CURRENT_DYNAMIC_TRANSITION] = [dynamicResult.current]
+        return this.transition(dynamicResult)
       }
 
       if (dynamicResult === true) {