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placed the redux-utils goop in a different directory

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Ken
2019-01-31 13:34:19 -08:00
parent 6da255c206
commit 2ecb667b3a
4 changed files with 49 additions and 36 deletions
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33
playground/src/reducers/createReducer.ts
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@@ -1,30 +1,9 @@
import { Reducer } from 'redux';
import { ActionTypes, TodoAction, TodoActionLookup } from '../actions';
import { Draft, produce } from 'immer';
import { ActionTypes, TodoActionLookup } from '../actions';
import { createGenericReducer, HandlerMap, ImmerReducer } from '../redux-utils/reducer';
export type ImmerReducer<T, A = any> = (state: Draft<T>, action?: A) => T;
export type HandlerMap<T> = { [actionType in ActionTypes]?: ImmerReducer<T, TodoActionLookup[actionType]> };
function isHandlerFunction<T>(handlerOrMap: HandlerMap<T> | ImmerReducer<T>): handlerOrMap is ImmerReducer<T> {
if (typeof handlerOrMap === 'function') {
return true;
}
return false;
}
export function createReducer<T, AType extends ActionTypes | never = never>(
export function createReducer<T, AT extends ActionTypes | never = never>(
initialState: T,
handlerOrMap: HandlerMap<T> | ImmerReducer<T, TodoActionLookup[AType]>
): Reducer<T> {
return function reducer(state = initialState, action: TodoAction | TodoActionLookup[AType]): T {
if (isHandlerFunction(handlerOrMap)) {
return produce(state, draft => handlerOrMap(draft, action as TodoActionLookup[AType]));
} else if (handlerOrMap.hasOwnProperty(action.type)) {
const handler = handlerOrMap[action.type] as ImmerReducer<T>;
return produce(state, draft => handler(draft, action));
} else {
return state;
}
};
handlerOrMap: HandlerMap<T, ActionTypes, TodoActionLookup> | ImmerReducer<T, TodoActionLookup[AT]>
) {
return createGenericReducer(initialState, handlerOrMap);
}