Add Redux and reducers.

Load i18n files and add dayjs.

src/redux/reducers/experiments.ts

@@ -0,0 +1,43 @@
+export type Experiments = never;
+export const AVAILABLE_EXPERIMENTS: Experiments[] = [ ];
+
+export interface ExperimentOptions {
+    enabled?: Experiments[]
+}
+
+export type ExperimentsAction =
+    | { type: undefined }
+    | {
+          type: "EXPERIMENTS_ENABLE";
+          key: Experiments;
+      }
+    | {
+          type: "EXPERIMENTS_DISABLE";
+          key: Experiments;
+      };
+
+export function experiments(
+    state = {} as ExperimentOptions,
+    action: ExperimentsAction
+): ExperimentOptions {
+    switch (action.type) {
+        case "EXPERIMENTS_ENABLE":
+            return {
+                ...state,
+                enabled: [
+                    ...(state.enabled ?? [])
+                        .filter(x => AVAILABLE_EXPERIMENTS.includes(x))
+                        .filter(v => v !== action.key),
+                    action.key
+                ]
+            };
+        case "EXPERIMENTS_DISABLE":
+            return {
+                ...state,
+                enabled: state.enabled?.filter(v => v !== action.key)
+                    .filter(x => AVAILABLE_EXPERIMENTS.includes(x))
+            };
+        default:
+            return state;
+    }
+}