devtools/client/inspector/store.js

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 "use strict";
   6
   7 const createStore = require("resource://devtools/client/shared/redux/create-store.js");
   8 const {
   9   combineReducers,
  10 } = require("resource://devtools/client/shared/vendor/redux.js");
  11 // Reducers which need to be available immediately when the Inspector loads.
  12 const reducers = {
  13   // Provide a dummy default reducer.
  14   // Redux throws an error when calling combineReducers() with an empty object.
  15   default: (state = {}) => state,
  16 };
  17
  18 function createReducer(laterReducers = {}) {
  19   return combineReducers({
  20     ...reducers,
  21     ...laterReducers,
  22   });
  23 }
  24
  25 module.exports = inspector => {
  26   const store = createStore(createReducer(), {
  27     // Enable log middleware in tests
  28     shouldLog: true,
  29     // Pass the client inspector instance so thunks (dispatched functions)
  30     // can access it from their arguments
  31     thunkOptions: { inspector },
  32   });
  33
  34   // Map of registered reducers loaded on-demand.
  35   store.laterReducers = {};
  36
  37   /**
  38    * Augment the current Redux store with a slice reducer.
  39    * Call this method to add reducers on-demand after the initial store creation.
  40    *
  41    * @param {String} key
  42    *        Slice name.
  43    * @param {Function} reducer
  44    *        Slice reducer function.
  45    */
  46   store.injectReducer = (key, reducer) => {
  47     if (store.laterReducers[key]) {
  48       console.log(`Already loaded reducer: ${key}`);
  49       return;
  50     }
  51     store.laterReducers[key] = reducer;
  52     store.replaceReducer(createReducer(store.laterReducers));
  53   };
  54
  55   return store;
  56 };