initial work on create slice

Author: neurosnap

src/createSlice.js

@@ -0,0 +1,45 @@
+import createNextState from 'immer';
+
+const defaultReducer = (state) => state;
+const getType = (slice, action) =>
+  slice ? `${slice}/${action}` : action;
+
+export default function createSlice({
+  slice = '',
+  actions = {},
+  initialState,
+}) {
+  const actionKeys = Object.keys(actions);
+
+  const reducerMap = actionKeys.reduce(
+    (map, action) => {
+      map[getType(slice, action)] = actions[action];
+      return map;
+    },
+    {},
+  );
+
+  const reducer = (state = initialState, { type, payload }) => {
+    const actionReducer = reducerMap[type] || defaultReducer;
+    const produce = (draft) => actionReducer(draft, payload);
+    return createNextState(state, produce);
+  };
+
+  const actionMap = actionKeys.reduce(
+    (map, action) => {
+      map[action] = (payload) => ({
+        type: getType(slice, action),
+        payload,
+      });
+
+      return map;
+    },
+    {},
+  );
+
+  return {
+    actions: actionMap,
+    reducer,
+    slice,
+  };
+}

src/index.js

@@ -1,5 +1,6 @@
 export { configureStore, getDefaultMiddleware } from './configureStore'
 export { createReducer } from './createReducer'
+export { default as createSlice } from './createSlice';
 
 export { default as createNextState } from 'immer'
 export { combineReducers, compose } from 'redux'