microsoft/frontend-bootcamp
1
0
Fork 0
mirror of https://github.com/microsoft/frontend-bootcamp.git synced 2026-01-26 14:56:42 +08:00
Code Issues Packages Projects Releases Wiki Activity

removing docs from master branch

Browse Source
This commit is contained in:
Micah Godbolt
2019-02-25 10:12:40 -08:00
parent ca136c95b5
commit 54f3c205f4
364 changed files with 0 additions and 10581 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
docs/playground/src/redux-utils/reducer.ts
View File

@@ -1,34 +0,0 @@
import { Reducer } from 'redux';
import { Draft, produce } from 'immer';
import { GenericActionLookup, GenericActionMapping } from './action';
export type ImmerReducer<T, A> = (state: Draft<T>, action?: A) => T;
export type HandlerMap<T, A extends GenericActionMapping<A>> = {
[actionType in keyof A]?: ImmerReducer<T, GenericActionLookup<A>[actionType]>
};
function isHandlerFunction<T, A extends GenericActionMapping<A>>(
handlerOrMap: HandlerMap<T, A> | ImmerReducer<T, A>
): handlerOrMap is ImmerReducer<T, A> {
if (typeof handlerOrMap === 'function') {
return true;
}
return false;
}
export function createGenericReducer<T, A extends GenericActionMapping<A>, AM = keyof GenericActionMapping<A>>(
initialState: T,
handlerOrMap: HandlerMap<T, A> | ImmerReducer<T, GenericActionLookup<A>[AM]>
): Reducer<T> {
return function reducer(state = initialState, action: GenericActionLookup<A>[AM]): T {
if (isHandlerFunction(handlerOrMap)) {
return produce(state, draft => handlerOrMap(draft, action as GenericActionLookup<A>[AM]));
} else if (handlerOrMap.hasOwnProperty(action.type)) {
const handler = (handlerOrMap as any)[action.type] as ImmerReducer<T, GenericActionLookup<A>[AM]>;
return produce(state, draft => handler(draft, action));
} else {
return state;
}
};
}