Add Redux and reducers.

Load i18n files and add dayjs.

src/redux/reducers/drafts.ts

@@ -0,0 +1,33 @@
+export type Drafts = { [key: string]: string };
+
+export type DraftAction =
+    | { type: undefined }
+    | {
+          type: "SET_DRAFT";
+          channel: string;
+          content: string;
+      }
+    | {
+          type: "CLEAR_DRAFT";
+          channel: string;
+      }
+    | {
+          type: "RESET";
+      };
+
+export function drafts(state: Drafts = {}, action: DraftAction): Drafts {
+    switch (action.type) {
+        case "SET_DRAFT":
+            return {
+                ...state,
+                [action.channel]: action.content
+            };
+        case "CLEAR_DRAFT":
+            const { [action.channel]: _, ...newState } = state;
+            return newState;
+        case "RESET":
+            return {};
+        default:
+            return state;
+    }
+}