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| 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 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | 1x 1x 1x 1x 3x 2x 6x 2x 2x 4x 2x 6x 6x 6x 9x 2x 2x 9x 2x 4x 2x 2x 1x 4x 4x 4x 2x 2x 1x 1x 2x 2x | import { Observable, merge, Subject, BehaviorSubject } from 'rxjs';
import { map, scan, distinctUntilChanged } from 'rxjs/operators';
import { AnyAction, wrapDispatchSubject } from './utils';
type GenericInputT = Observable<any> | Subject<any>;
type StateRxInputT = {
name: string;
_dispatchers$: Subject<Subject<AnyAction<any>>>;
state$: Subject<any>;
action$: Observable<any>;
};
type ObservableInputT = GenericInputT | StateRxInputT;
export const createStore = (
observables: { [key: string]: ObservableInputT },
initialState = {}
) => {
const stateRxBranches = Object.values(observables).filter(
(branch) => 'state$' in branch
) as StateRxInputT[];
// Create dispatch function and add to all of our branches
const dispatch$ = new Subject<AnyAction<any>>();
stateRxBranches.forEach((branch) => {
branch._dispatchers$.next(dispatch$);
});
// Create Normalized State {[stateKey]: observable}
const normalizedObservables = Object.entries(observables).map(
([key, input]) => {
const obs = 'state$' in input ? input.state$ : input;
return obs.pipe(
distinctUntilChanged(),
map((val) => ({ [key]: val }))
);
}
);
const state$ = new BehaviorSubject(initialState);
const reducer$ = merge(...normalizedObservables).pipe(
scan((acc, val) => {
return {
...acc,
...val
};
}, initialState)
);
const action$ = merge(
dispatch$,
...stateRxBranches.map((state) => state.action$)
).pipe(distinctUntilChanged());
reducer$.subscribe(state$);
const setState = (newState: { [key: string]: any }) => {
for (const key in newState) {
const obs = observables[key];
const newValue = newState[key];
if ('state$' in obs) {
obs.state$.next(newValue);
} else if ('next' in obs) {
obs.next(newValue);
} else {
console.warn(
`Cannot set store value of ${key}. It is not a StateRx Objects or subject.`
);
}
}
};
const getState = () => state$.getValue();
return {
state$,
action$,
dispatch: wrapDispatchSubject(dispatch$),
initialState,
setState,
getState
};
};
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