-
Notifications
You must be signed in to change notification settings - Fork 0
/
SideEffect.ts
47 lines (43 loc) · 1.18 KB
/
SideEffect.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
import {Signal, State, Transition} from "./Automaton";
/**
* Side effect implementation function.
*/
type SideEffectImplementation = ((...args: any) => void);
/**
* Class that represents a special side effect transition.
*/
class SideEffect extends Transition {
constructor(
state: State,
signal: Signal | undefined,
implementation: SideEffectImplementation,
) {
super(state, signal, (...args: any[]) => {
implementation(...args);
return state;
});
}
}
/**
* Creates a [[SideEffect]] that is an empty transition returning the previous state.
*
* @param state - target state
* @param implementation - side effect function
*/
export function sideEffect(state: State, implementation: SideEffectImplementation): SideEffect;
export function sideEffect(state: State, signal: Signal, implementation: SideEffectImplementation): SideEffect;
export function sideEffect(
state: State,
signalOrImpl: Signal | SideEffectImplementation,
implementation?: SideEffectImplementation,
): SideEffect {
if (typeof signalOrImpl === "function") {
implementation = signalOrImpl;
signalOrImpl = void 0;
}
return new SideEffect(
state,
signalOrImpl as Signal,
implementation,
);
}