docs: add jsdoc

src/components/protected-route/index.tsx

@@ -1,13 +1,40 @@
 import { Navigate, Outlet, useLocation } from "react-router"
 import { useAppSelector } from "@/store"
 
-export const ProtectedRoute = () => {
+/**
+ * Renders child routes if the user is unauthenticated, otherwise redirects authenticated users to
+ * the root path.
+ *
+ * This component's logic allows unauthenticated users to access nested routes rendered
+ * via `Outlet`. Conversely, if a user is authenticated, they are redirected to the application's
+ * root path (`""`). This behaviour is inverse to the typical implementation of a 'protected route',
+ * which usually grants access to authenticated users and redirects unauthenticated users to a
+ * login page.
+ */
+export default function ProtectedRoute() {
+  /**
+   * Retrieves the authentication status from the Redux store.
+   */
   const isAuthenticated = useAppSelector((state) => state.auth.isAuthenticated)
+
+  /**
+   * Retrieves the current location object from React Router.
+   */
   const location = useLocation()
 
   if (isAuthenticated) {
+    /**
+     * Redirects authenticated users to the application's root path (`""`).
+     *
+     * The redirection includes the current location's state, allowing the
+     * target route to know where the user was redirected from. The
+     * `replace` prop ensures the current history entry is replaced.
+     */
     return <Navigate to="" state={{ from: location }} replace />
   }
 
+  /**
+   * Renders the child routes if the user is unauthenticated.
+   */
   return <Outlet />
-}
+}

src/main.tsx

@@ -2,9 +2,9 @@ import { StrictMode } from "react"
 import { createRoot } from "react-dom/client"
 import { Provider } from "react-redux"
 import { BrowserRouter, Route, Routes } from "react-router"
-import { store } from "@/store"
+import store from "@/store"
 import "./index.css"
-import { ProtectedRoute } from "@/components/protected-route"
+import ProtectedRoute from "@/components/protected-route"
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>

src/plugin/datetime/index.ts

@@ -3,8 +3,21 @@ import duration from "dayjs/plugin/duration"
 
 dayjs.extend(duration)
 
+/**
+ * Dayjs with `Duration` plugin.
+ */
 export default dayjs
 
-const formatDatetime = (datetime: string) => dayjs(datetime).format("YYYY-MM-DD HH:mm:ss")
+/**
+ * Formats a given datetime string into a standardised "YYYY-MM-DD HH:mm:ss" format.
+ *
+ * This function utilises the [dayjs](https://day.js.org/) library for parsing and formatting.
+ *
+ * @param {string} datetime the datetime string to format
+ * @returns {string} the formatted datetime string in `YYYY-MM-DD HH:mm:ss` format
+ */
+function formatDatetime (datetime: string): string {
+  return dayjs(datetime).format("YYYY-MM-DD HH:mm:ss")
+}
 
 export { formatDatetime }

src/store/auth-slice.ts

@@ -1,20 +1,63 @@
 import { createSlice } from "@reduxjs/toolkit"
 
+/**
+ * Defines the structure of the authentication state within the Redux store.
+ */
 interface AuthState {
+  /**
+   * Indicates whether a user is currently authenticated.
+   * @type {boolean}
+   */
   isAuthenticated: boolean
 }
 
+/**
+ * The initial state for the authentication slice.
+ *
+ * By default, the user is considered unauthenticated.
+ *
+ * @constant
+ * @type {AuthState}
+ */
 const initialState: AuthState = {
   isAuthenticated: false
 }
 
+/**
+ * A Redux Toolkit slice for managing authentication-related state.
+ *
+ * This slice includes the reducer, actions, and initial state for the authentication feature.
+ * Currently, it only defines the initial state and no specific reducers, meaning it only
+ * holds the `isAuthenticated` flag.
+ */
 const authSlice = createSlice({
+  /**
+   * The name of the slice, used to generate action types.
+   * @type {string}
+   */
   name: "auth",
+  /**
+   * The initial state for this slice.
+   * @type {AuthState}
+   */
   initialState,
+  /**
+   * An object of reducer functions. Currently empty, meaning no actions are explicitly defined for
+   * state modification within this slice.
+   * @type {object}
+   */
   reducers: {
 
   }
 })
 
 // export const {  } = authSlice.actions
+
+/**
+ * The reducer function for the authentication slice.
+ *
+ * This is the default export and should be combined with other reducers in the Redux store.
+ *
+ * @default
+ */
 export default authSlice.reducer

src/store/index.ts

@@ -2,15 +2,23 @@ import { configureStore } from "@reduxjs/toolkit"
 import { useDispatch, useSelector } from "react-redux"
 import authReducer from "./auth-slice.ts"
 
-export const store = configureStore({
+/**
+ * The Redux store instance for the application.
+ *
+ * This store is configured using [`configureStore`](https://redux-toolkit.js.org/api/configureStore)
+ * from <code>@reduxjs/toolkit</code>. It combines various slice reducers into
+ * a single root redux.
+ */
+const store = configureStore({
   reducer: {
     auth: authReducer,
   },
 })
 
+export default store
 export type RootState = ReturnType<typeof store.getState>
 export type AppDispatch = typeof store.dispatch
 export type AppStore = typeof store
 
 export const useAppDispatch = useDispatch.withTypes<AppDispatch>()
-export const useAppSelector = useSelector.withTypes<RootState>()
+export const useAppSelector = useSelector.withTypes<RootState>()