diff --git a/package.json b/package.json
index 2ff94818..e92fd235 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
         "pull": "node scripts/setup_assets.js",
         "build": "rimraf build && node scripts/setup_assets.js --check && vite build",
         "preview": "vite preview",
-        "lint": "eslint 'src/**/*.{js,jsx,ts,tsx}'",
+        "lint": "eslint src/**/*.{js,jsx,ts,tsx}",
         "fmt": "prettier --write 'src/**/*.{js,jsx,ts,tsx}'",
         "typecheck": "tsc --noEmit",
         "start": "sirv dist --cors --single --host",
@@ -37,6 +37,18 @@
                 {
                     "varsIgnorePattern": "^_"
                 }
+            ],
+            "require-jsdoc": [
+                "error",
+                {
+                    "require": {
+                        "FunctionDeclaration": true,
+                        "MethodDefinition": true,
+                        "ClassDeclaration": true,
+                        "ArrowFunctionExpression": false,
+                        "FunctionExpression": false
+                    }
+                }
             ]
         }
     },
diff --git a/src/components/common/messaging/MessageBox.tsx b/src/components/common/messaging/MessageBox.tsx
index 409f2439..8b4d5b15 100644
--- a/src/components/common/messaging/MessageBox.tsx
+++ b/src/components/common/messaging/MessageBox.tsx
@@ -20,6 +20,7 @@ import {
     SMOOTH_SCROLL_ON_RECEIVE,
 } from "../../../lib/renderer/Singleton";
 
+import { useApplicationState } from "../../../mobx/State";
 import { dispatch, getState } from "../../../redux";
 import { Reply } from "../../../redux/reducers/queue";
 
@@ -115,7 +116,7 @@ const RE_SED = new RegExp("^s/([^])*/([^])*$");
 export const CAN_UPLOAD_AT_ONCE = 4;
 
 export default observer(({ channel }: Props) => {
-    const [draft, setDraft] = useState(getState().drafts[channel._id] ?? "");
+    const drafts = useApplicationState().draft;
 
     const [uploadState, setUploadState] = useState<UploadState>({
         type: "none",
@@ -150,7 +151,7 @@ export default observer(({ channel }: Props) => {
 
     const setMessage = useCallback(
         (content?: string) => {
-            setDraft(content ?? "");
+            drafts.set(channel._id, content);
 
             if (content) {
                 dispatch({
@@ -165,10 +166,15 @@ export default observer(({ channel }: Props) => {
                 });
             }
         },
-        [channel._id],
+        [drafts, channel._id],
     );
 
     useEffect(() => {
+        /**
+         *
+         * @param content
+         * @param action
+         */
         function append(content: string, action: "quote" | "mention") {
             const text =
                 action === "quote"
@@ -178,10 +184,10 @@ export default observer(({ channel }: Props) => {
                           .join("\n")}\n\n`
                     : `${content} `;
 
-            if (!draft || draft.length === 0) {
+            if (!drafts.has(channel._id)) {
                 setMessage(text);
             } else {
-                setMessage(`${draft}\n${text}`);
+                setMessage(`${drafts.get(channel._id)}\n${text}`);
             }
         }
 
@@ -190,13 +196,16 @@ export default observer(({ channel }: Props) => {
             "append",
             append as (...args: unknown[]) => void,
         );
-    }, [draft, setMessage]);
+    }, [drafts, channel._id, setMessage]);
 
+    /**
+     * Trigger send message.
+     */
     async function send() {
         if (uploadState.type === "uploading" || uploadState.type === "sending")
             return;
 
-        const content = draft?.trim() ?? "";
+        const content = drafts.get(channel._id)?.trim() ?? "";
         if (uploadState.type === "attached") return sendFile(content);
         if (content.length === 0) return;
 
@@ -281,6 +290,11 @@ export default observer(({ channel }: Props) => {
         }
     }
 
+    /**
+     *
+     * @param content
+     * @returns
+     */
     async function sendFile(content: string) {
         if (uploadState.type !== "attached") return;
         const attachments: string[] = [];
@@ -372,6 +386,10 @@ export default observer(({ channel }: Props) => {
         }
     }
 
+    /**
+     *
+     * @returns
+     */
     function startTyping() {
         if (typeof typing === "number" && +new Date() < typing) return;
 
@@ -385,6 +403,10 @@ export default observer(({ channel }: Props) => {
         }
     }
 
+    /**
+     *
+     * @param force
+     */
     function stopTyping(force?: boolean) {
         if (force || typing) {
             const ws = client.websocket;
@@ -503,7 +525,7 @@ export default observer(({ channel }: Props) => {
                     id="message"
                     maxLength={2000}
                     onKeyUp={onKeyUp}
-                    value={draft ?? ""}
+                    value={drafts.get(channel._id) ?? ""}
                     padding="var(--message-box-padding)"
                     onKeyDown={(e) => {
                         if (e.ctrlKey && e.key === "Enter") {
@@ -513,10 +535,7 @@ export default observer(({ channel }: Props) => {
 
                         if (onKeyDown(e)) return;
 
-                        if (
-                            e.key === "ArrowUp" &&
-                            (!draft || draft.length === 0)
-                        ) {
+                        if (e.key === "ArrowUp" && !drafts.has(channel._id)) {
                             e.preventDefault();
                             internalEmit("MessageRenderer", "edit_last");
                             return;
diff --git a/src/context/index.tsx b/src/context/index.tsx
index 0abdbdb8..e7e2cab8 100644
--- a/src/context/index.tsx
+++ b/src/context/index.tsx
@@ -9,6 +9,10 @@ import Theme from "./Theme";
 import Intermediate from "./intermediate/Intermediate";
 import Client from "./revoltjs/RevoltClient";
 
+/**
+ * This component provides all of the application's context layers.
+ * @param param0 Provided children
+ */
 export default function Context({ children }: { children: Children }) {
     return (
         <Router basename={import.meta.env.BASE_URL}>
diff --git a/src/mobx/Persistent.ts b/src/mobx/Persistent.ts
new file mode 100644
index 00000000..576e6133
--- /dev/null
+++ b/src/mobx/Persistent.ts
@@ -0,0 +1,16 @@
+/**
+ * A data store which is persistent and should cache its data locally.
+ */
+export default interface Persistent<T> {
+    /**
+     * Override toJSON to serialise this data store.
+     * This will also force all subclasses to implement this method.
+     */
+    toJSON(): unknown;
+
+    /**
+     * Hydrate this data store using given data.
+     * @param data Given data
+     */
+    hydrate(data: T): void;
+}
diff --git a/src/mobx/State.ts b/src/mobx/State.ts
new file mode 100644
index 00000000..ca112b37
--- /dev/null
+++ b/src/mobx/State.ts
@@ -0,0 +1,37 @@
+import { makeAutoObservable } from "mobx";
+
+import { createContext } from "preact";
+import { useContext } from "preact/hooks";
+
+import Auth from "./stores/Auth";
+import Draft from "./stores/Draft";
+
+/**
+ * Handles global application state.
+ */
+export default class State {
+    auth: Auth;
+    draft: Draft;
+
+    /**
+     * Construct new State.
+     */
+    constructor() {
+        this.auth = new Auth();
+        this.draft = new Draft();
+
+        makeAutoObservable(this);
+    }
+}
+
+const StateContext = createContext<State>(null!);
+
+export const StateContextProvider = StateContext.Provider;
+
+/**
+ * Get the application state
+ * @returns Application state
+ */
+export function useApplicationState() {
+    return useContext(StateContext);
+}
diff --git a/src/mobx/TODO b/src/mobx/TODO
new file mode 100644
index 00000000..63d63932
--- /dev/null
+++ b/src/mobx/TODO
@@ -0,0 +1,14 @@
+auth
+drafts
+experiments
+last opened
+locale
+notifications
+queue
+section toggle
+serevr config
+settings
+sync
+themes
+trusted links
+unreads
diff --git a/src/mobx/objectUtil.ts b/src/mobx/objectUtil.ts
new file mode 100644
index 00000000..2de0fa1a
--- /dev/null
+++ b/src/mobx/objectUtil.ts
@@ -0,0 +1,6 @@
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export function deleteKey(object: any, key: string) {
+    const newObject = { ...object };
+    delete newObject[key];
+    return newObject;
+}
diff --git a/src/mobx/stores/Auth.ts b/src/mobx/stores/Auth.ts
new file mode 100644
index 00000000..1a4d8d09
--- /dev/null
+++ b/src/mobx/stores/Auth.ts
@@ -0,0 +1,70 @@
+import { makeAutoObservable } from "mobx";
+import { Session } from "revolt-api/types/Auth";
+import { Nullable } from "revolt.js/dist/util/null";
+
+import Persistent from "../Persistent";
+import { deleteKey } from "../objectUtil";
+
+interface Data {
+    sessions: Record<string, Session>;
+    current?: string;
+}
+
+/**
+ * Handles account authentication, managing multiple
+ * accounts and their sessions.
+ */
+export default class Auth implements Persistent<Data> {
+    private sessions: Record<string, Session>;
+    private current: Nullable<string>;
+
+    /**
+     * Construct new Auth store.
+     */
+    constructor() {
+        this.sessions = {};
+        this.current = null;
+        makeAutoObservable(this);
+    }
+
+    // eslint-disable-next-line require-jsdoc
+    toJSON() {
+        return {
+            sessions: this.sessions,
+            current: this.current,
+        };
+    }
+
+    // eslint-disable-next-line require-jsdoc
+    hydrate(data: Data) {
+        this.sessions = data.sessions;
+        if (data.current && this.sessions[data.current]) {
+            this.current = data.current;
+        }
+    }
+
+    /**
+     * Add a new session to the auth manager.
+     * @param session Session
+     */
+    setSession(session: Session) {
+        this.sessions = {
+            ...this.sessions,
+            [session.user_id]: session,
+        };
+
+        this.current = session.user_id;
+    }
+
+    /**
+     * Remove existing session by user ID.
+     * @param user_id User ID tied to session
+     */
+    removeSession(user_id: string) {
+        this.sessions = deleteKey(this.sessions, user_id);
+
+        if (user_id == this.current) {
+            this.current = null;
+        }
+    }
+}
diff --git a/src/mobx/stores/Draft.ts b/src/mobx/stores/Draft.ts
new file mode 100644
index 00000000..5bb51d26
--- /dev/null
+++ b/src/mobx/stores/Draft.ts
@@ -0,0 +1,80 @@
+import { action, computed, makeAutoObservable, ObservableMap } from "mobx";
+
+import Persistent from "../Persistent";
+
+interface Data {
+    drafts: Record<string, string>;
+}
+
+/**
+ * Handles storing draft (currently being written) messages.
+ */
+export default class Draft implements Persistent<Data> {
+    private drafts: ObservableMap<string, string>;
+
+    /**
+     * Construct new Draft store.
+     */
+    constructor() {
+        this.drafts = new ObservableMap();
+        makeAutoObservable(this);
+    }
+
+    // eslint-disable-next-line require-jsdoc
+    toJSON() {
+        return {
+            drafts: this.drafts,
+        };
+    }
+
+    // eslint-disable-next-line require-jsdoc
+    @action hydrate(data: Data) {
+        Object.keys(data.drafts).forEach((key) =>
+            this.drafts.set(key, data.drafts[key]),
+        );
+    }
+
+    /**
+     * Get draft for a channel.
+     * @param channel Channel ID
+     */
+    @computed get(channel: string) {
+        return this.drafts.get(channel);
+    }
+
+    /**
+     * Check whether a channel has a draft.
+     * @param channel Channel ID
+     */
+    @computed has(channel: string) {
+        return this.drafts.has(channel) && this.drafts.get(channel)!.length > 0;
+    }
+
+    /**
+     * Set draft for a channel.
+     * @param channel Channel ID
+     * @param content Draft content
+     */
+    @action set(channel: string, content?: string) {
+        if (typeof content === "undefined") {
+            return this.clear(channel);
+        }
+
+        this.drafts.set(channel, content);
+    }
+
+    /**
+     * Clear draft from a channel.
+     * @param channel Channel ID
+     */
+    @action clear(channel: string) {
+        this.drafts.delete(channel);
+    }
+
+    /**
+     * Reset and clear all drafts.
+     */
+    @action reset() {
+        this.drafts.clear();
+    }
+}
diff --git a/src/redux/State.tsx b/src/redux/State.tsx
index bd89e25f..46474ab7 100644
--- a/src/redux/State.tsx
+++ b/src/redux/State.tsx
@@ -3,6 +3,8 @@ import { Provider } from "react-redux";
 
 import { useEffect, useState } from "preact/hooks";
 
+import MobXState, { StateContextProvider } from "../mobx/State";
+
 import { dispatch, State, store } from ".";
 import { Children } from "../types/Preact";
 
@@ -10,8 +12,13 @@ interface Props {
     children: Children;
 }
 
+/**
+ * Component for loading application state.
+ * @param props Provided children
+ */
 export default function StateLoader(props: Props) {
     const [loaded, setLoaded] = useState(false);
+    const [state] = useState(new MobXState());
 
     useEffect(() => {
         localForage.getItem("state").then((state) => {
@@ -24,5 +31,11 @@ export default function StateLoader(props: Props) {
     }, []);
 
     if (!loaded) return null;
-    return <Provider store={store}>{props.children}</Provider>;
+    return (
+        <Provider store={store}>
+            <StateContextProvider value={state}>
+                {props.children}
+            </StateContextProvider>
+        </Provider>
+    );
 }