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class Store {
constructor(reducer, catcher) {
this.reducer = reducer;
this.catcher = catcher;
this.subscribers = [];
try {
this.state = this.reducer(undefined, {});
} catch (e) {
catcher(e);
}
}
dispatch(action, sender) {
if (action instanceof Promise) {
action.then((a) => {
this.transitNext(a, sender);
}).catch((e) => {
this.catcher(e, sender);
});
} else {
try {
this.transitNext(action, sender);
} catch (e) {
this.catcher(e, sender);
}
}
return action;
}
getState() {
return this.state;
}
subscribe(callback) {
this.subscribers.push(callback);
}
transitNext(action, sender) {
let newState = this.reducer(this.state, action);
if (JSON.stringify(this.state) !== JSON.stringify(newState)) {
this.state = newState;
this.subscribers.forEach(f => f(sender));
}
}
}
const empty = () => {};
const createStore = (reducer, catcher = empty) => {
return new Store(reducer, catcher);
};
export { createStore };
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