@@ -190,6 +190,10 @@ export const appearStartedState = stateFunc(StateID.AppearStarted, "appear");
190190export const enterStartedState = stateFunc ( StateID . EnterStarted , "enter" ) ;
191191export const leaveStartedState = stateFunc ( StateID . LeaveStarted , "leave" ) ;
192192
193+ const invalidTransitionError = ( stateID : StateID , actionID : ActionID ) => {
194+ return new Error ( `invalid state transition from ${ StateID [ stateID ] } ${ ActionID [ actionID ] } ) ;
195+ } ;
196+ 193197export type Reducer = ( stateID : StateID , action : Action ) =>
194198 { state : TransitionState , pending ?: ActionID , completed ?: boolean } ;
195199
@@ -236,7 +240,7 @@ export const reducer: Reducer = (stateID, action) => {
236240 nextState = appearInitState ( props ) ;
237241 break ;
238242 default :
239- throw new Error ( `invalid state transition from ${ StateID [ stateID ] } ` ) ;
243+ throw invalidTransitionError ( stateID , action . kind ) ;
240244 } ;
241245 return { state : nextState , pending : ActionID . TransitionPrepare } ;
242246 case ActionID . TransitionPrepare :
@@ -254,7 +258,7 @@ export const reducer: Reducer = (stateID, action) => {
254258 nextState = appearPrepareState ( props ) ;
255259 break ;
256260 default :
257- throw new Error ( `invalid state transition from ${ StateID [ stateID ] } ` ) ;
261+ throw invalidTransitionError ( stateID , action . kind ) ;
258262 } ;
259263 return { state : nextState , pending : ActionID . TransitionTrigger } ;
260264 case ActionID . TransitionStart :
@@ -281,7 +285,7 @@ export const reducer: Reducer = (stateID, action) => {
281285 case StateID . LeaveStarted :
282286 return { state : defaultState ( props ) , completed : true } ;
283287 default :
284- throw new Error ( `invalid state transition from ${ StateID [ stateID ] } ` ) ;
288+ throw invalidTransitionError ( stateID , action . kind ) ;
285289 }
286290 case ActionID . TransitionTrigger :
287291 switch ( stateID ) {
@@ -318,7 +322,7 @@ export const reducer: Reducer = (stateID, action) => {
318322 case StateID . LeaveStarted :
319323 return { state : enterStartedState ( props ) } ;
320324 default :
321- throw new Error ( `invalid state transition from ${ StateID [ stateID as any ] } ` ) ;
325+ throw invalidTransitionError ( stateID , action . kind ) ;
322326 }
323327 case ActionID . Timeout :
324328 switch ( stateID ) {
@@ -331,7 +335,7 @@ export const reducer: Reducer = (stateID, action) => {
331335 case StateID . LeaveStarted :
332336 return { state : defaultState ( props ) , completed : true } ;
333337 default :
334- throw new Error ( `invalid state transition from ${ StateID [ stateID ] } ` ) ;
338+ throw invalidTransitionError ( stateID , action . kind ) ;
335339 }
336340 default :
337341 }
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