updated leaflet version and tree-shaked deps

src/utils/reducer.ts

@@ -0,0 +1,13 @@
+// create-reducer.ts
+import { Action } from 'redux';
+
+type Handlers<State, Types extends string, Actions extends Action<Types>> = {
+  readonly [Type in Types]: (state: State, action: Actions) => State
+}
+
+export const createReducer = (
+  initialState,
+  handlers,
+) => (state = initialState, action) => (handlers.hasOwnProperty(action.type)
+  ? handlers[action.type](state, action)
+  : state);