1 files changed, 56 insertions, 0 deletions
diff --git a/devtools/client/inspector/store.js b/devtools/client/inspector/store.js
new file mode 100644
index 0000000000..d9d7c0f995
--- /dev/null
+++ b/devtools/client/inspector/store.js
@@ -0,0 +1,56 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const createStore = require("resource://devtools/client/shared/redux/create-store.js");
+const {
+  combineReducers,
+} = require("resource://devtools/client/shared/vendor/redux.js");
+// Reducers which need to be available immediately when the Inspector loads.
+const reducers = {
+  // Provide a dummy default reducer.
+  // Redux throws an error when calling combineReducers() with an empty object.
+  default: (state = {}) => state,
+};
+
+function createReducer(laterReducers = {}) {
+  return combineReducers({
+    ...reducers,
+    ...laterReducers,
+  });
+}
+
+module.exports = inspector => {
+  const store = createStore(createReducer(), {
+    // Enable log middleware in tests
+    shouldLog: true,
+    // Pass the client inspector instance so thunks (dispatched functions)
+    // can access it from their arguments
+    thunkOptions: { inspector },
+  });
+
+  // Map of registered reducers loaded on-demand.
+  store.laterReducers = {};
+
+  /**
+   * Augment the current Redux store with a slice reducer.
+   * Call this method to add reducers on-demand after the initial store creation.
+   *
+   * @param {String} key
+   *        Slice name.
+   * @param {Function} reducer
+   *        Slice reducer function.
+   */
+  store.injectReducer = (key, reducer) => {
+    if (store.laterReducers[key]) {
+      console.log(`Already loaded reducer: ${key}`);
+      return;
+    }
+    store.laterReducers[key] = reducer;
+    store.replaceReducer(createReducer(store.laterReducers));
+  };
+
+  return store;
+};