diff --git a/.gitignore b/.gitignore
index 6130491..d59a0cf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,8 @@
-/.idea
-node_modules/
-/config
-/dist
+.idea
+node_modules
+config
+dist
+build
 GH_TOKEN
 
 yarn-error.log
diff --git a/package.json b/package.json
index da24adb..4c7514a 100644
--- a/package.json
+++ b/package.json
@@ -8,14 +8,14 @@
   },
   "homepage": "https://gitlab.com/ArisuOngaku/tabs",
   "license": "GPL-3.0-only",
-  "main": "tabs.js",
+  "main": "build/main.js",
   "scripts": {
-    "start": "electron .",
-    "dev": "electron . --dev",
-    "build": "electron-builder",
-    "build-arch": "electron-builder --linux dir",
-    "release": "GH_TOKEN=$(cat GH_TOKEN) electron-builder -wlp always",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "clean": "! test -d build || rm -r build",
+    "compile": "yarn clean && tsc",
+    "start": "yarn compile && electron .",
+    "dev": "yarn compile && electron . --dev",
+    "build": "yarn compile && electron-builder -wl",
+    "release": "yarn compile && GH_TOKEN=$(cat GH_TOKEN) electron-builder -wlp always"
   },
   "dependencies": {
     "appdata-path": "^1.0.0",
@@ -25,11 +25,17 @@
     "single-instance": "^0.0.1"
   },
   "devDependencies": {
+    "@types/node": "^12.12.41",
     "electron": "^9.0.0",
-    "electron-builder": "^22.4.0"
+    "electron-builder": "^22.4.0",
+    "typescript": "^3.9.3"
   },
   "build": {
     "appId": "tabs-app",
+    "files": [
+      "resources/**/*",
+      "build/**/*"
+    ],
     "linux": {
       "target": "AppImage",
       "icon": "resources/logo.png",
diff --git a/src/Config.js b/src/Config.ts
similarity index 79%
rename from src/Config.js
rename to src/Config.ts
index f8c0132..9d06768 100644
--- a/src/Config.js
+++ b/src/Config.ts
@@ -9,18 +9,19 @@ const configDir = Meta.isDevMode() ? getAppDataPath('tabs-app-dev') : getAppData
 const configFile = path.resolve(configDir, 'config.json');
 
 export default class Config {
-    updateCheckSkip = undefined;
-    securityButton = true;
-    homeButton = false;
-    backButton = true;
-    forwardButton = false;
-    refreshButton = false;
+    public services: Service[] = [];
+    public updateCheckSkip?: string;
+    public securityButton: boolean = true;
+    public homeButton: boolean = false;
+    public backButton: boolean = true;
+    public forwardButton: boolean = false;
+    public refreshButton: boolean = false;
 
-    properties = [];
+    private properties: string[] = [];
 
     constructor() {
         // Load data from config file
-        let data = {};
+        let data: any = {};
         if (fs.existsSync(configDir) && fs.statSync(configDir).isDirectory()) {
             if (fs.existsSync(configFile) && fs.statSync(configFile).isFile())
                 data = JSON.parse(fs.readFileSync(configFile, 'utf8'));
@@ -29,7 +30,6 @@ export default class Config {
         }
 
         // Parse services
-        this.services = [];
         if (typeof data.services === 'object') {
             let i = 0;
             for (const service of data.services) {
@@ -60,18 +60,18 @@ export default class Config {
         console.log('> Config saved to', configFile.toString());
     }
 
-    defineProperty(name, data) {
+    defineProperty(name: string, data: any) {
         if (data[name] !== undefined) {
-            this[name] = data[name];
+            (<any>this)[name] = data[name];
         }
 
         this.properties.push(name);
     }
 
-    update(data) {
+    update(data: any) {
         for (const prop of this.properties) {
             if (data[prop] !== undefined) {
-                this[prop] = data[prop];
+                (<any>this)[prop] = data[prop];
             }
         }
     }
diff --git a/src/Meta.js b/src/Meta.js
deleted file mode 100644
index 65dec44..0000000
--- a/src/Meta.js
+++ /dev/null
@@ -1,29 +0,0 @@
-export default class Meta {
-    static #title = 'Tabs';
-    static #devMode = null;
-
-    static get title() {
-        return this.#title;
-    }
-
-    static isDevMode() {
-        if (this.#devMode === null) {
-            this.#devMode = process.argv.length > 2 && process.argv[2] === '--dev';
-            console.debug('Dev mode:', this.#devMode);
-        }
-
-        return this.#devMode;
-    }
-
-    /**
-     * @param service {Service}
-     * @param viewTitle {string}
-     */
-    static getTitleForService(service, viewTitle) {
-        let suffix = '';
-        if (typeof viewTitle === 'string' && viewTitle.length > 0) {
-            suffix = ' - ' + viewTitle;
-        }
-        return this.title + ' - ' + service.name + suffix;
-    }
-}
\ No newline at end of file
diff --git a/src/Meta.ts b/src/Meta.ts
new file mode 100644
index 0000000..3f0a83a
--- /dev/null
+++ b/src/Meta.ts
@@ -0,0 +1,23 @@
+import Service from "./Service";
+
+export default class Meta {
+    public static readonly title = 'Tabs';
+    private static devMode?: boolean;
+
+    public static isDevMode() {
+        if (this.devMode === undefined) {
+            this.devMode = process.argv.length > 2 && process.argv[2] === '--dev';
+            console.debug('Dev mode:', this.devMode);
+        }
+
+        return this.devMode;
+    }
+
+    public static getTitleForService(service: Service, viewTitle: string) {
+        let suffix = '';
+        if (viewTitle.length > 0) {
+            suffix = ' - ' + viewTitle;
+        }
+        return this.title + ' - ' + service.name + suffix;
+    }
+}
\ No newline at end of file
diff --git a/src/Service.js b/src/Service.js
deleted file mode 100644
index 5d3a9d2..0000000
--- a/src/Service.js
+++ /dev/null
@@ -1,42 +0,0 @@
-class Service {
-    constructor(partition, name, icon, isImage, url, useFavicon) {
-        if (arguments.length === 1) {
-            let data = arguments[0];
-            for (let k in data) {
-                if (data.hasOwnProperty(k)) {
-                    this[k] = data[k];
-                }
-            }
-        } else {
-            this.partition = partition;
-            this.name = name;
-            this.icon = icon;
-            this.isImage = isImage;
-            this.url = url;
-            this.useFavicon = useFavicon;
-        }
-
-        for (let k in Service.requiredProperties) {
-            if (Service.requiredProperties.hasOwnProperty(k)) {
-                if (!this.hasOwnProperty(k) || this[k] === undefined) {
-                    this[k] = Service.requiredProperties[k];
-                }
-            }
-        }
-    }
-}
-
-Service.requiredProperties = {
-    'partition': null,
-    'name': null,
-    'icon': null,
-    'isImage': null,
-    'url': null,
-    'useFavicon': true,
-    'autoLoad': false,
-    'customCSS': null,
-    'customUserAgent': null,
-    'permissions': {},
-};
-
-export default Service;
diff --git a/src/Service.ts b/src/Service.ts
new file mode 100644
index 0000000..04d6204
--- /dev/null
+++ b/src/Service.ts
@@ -0,0 +1,31 @@
+export default class Service {
+    public partition?: string;
+    public name?: string;
+    public icon?: string;
+    public isImage?: boolean = false;
+    public url?: string;
+    public useFavicon?: boolean = true;
+    public favicon?: string;
+    public autoLoad?: boolean = false;
+    public customCSS?: string;
+    public customUserAgent?: string;
+    public permissions?: {} = {};
+
+    constructor(partition: string, name?: string, icon?: string, isImage?: boolean, url?: string, useFavicon?: boolean) {
+        if (arguments.length === 1) {
+            const data = arguments[0];
+            for (const k in data) {
+                if (data.hasOwnProperty(k)) {
+                    (<any>this)[k] = data[k];
+                }
+            }
+        } else {
+            this.partition = partition;
+            this.name = name;
+            this.icon = icon;
+            this.isImage = isImage;
+            this.url = url;
+            this.useFavicon = useFavicon;
+        }
+    }
+}
diff --git a/src/Updater.js b/src/Updater.ts
similarity index 53%
rename from src/Updater.js
rename to src/Updater.ts
index 372dbcc..5cece7e 100644
--- a/src/Updater.js
+++ b/src/Updater.ts
@@ -1,32 +1,32 @@
-import {autoUpdater} from "electron-updater";
+import {autoUpdater, UpdateInfo} from "electron-updater";
 
 export default class Updater {
-    #updateInfo;
+    private updateInfo?: UpdateInfo;
 
     constructor() {
         autoUpdater.autoDownload = false;
         autoUpdater.on('error', err => {
-            this.notifyUpdate(false, err);
+            console.log('Error while checking for updates', err);
         });
         autoUpdater.on('update-available', v => {
-            this.notifyUpdate(true, v);
+            console.log('Update available', v);
         });
         autoUpdater.on('update-not-available', () => {
-            this.notifyUpdate(false);
+            console.log('No update available.');
         });
     }
 
     /**
      * @param {Function} callback
      */
-    checkForUpdates(callback) {
-        if (this.#updateInfo) {
-            callback(this.#updateInfo.version !== this.getCurrentVersion().raw, this.#updateInfo);
+    checkForUpdates(callback: UpdateCheckCallback) {
+        if (this.updateInfo) {
+            callback(this.updateInfo.version !== this.getCurrentVersion().raw, this.updateInfo);
             return;
         }
 
         autoUpdater.checkForUpdates().then(r => {
-            this.#updateInfo = r.updateInfo;
+            this.updateInfo = r.updateInfo;
             callback(r.updateInfo.version !== this.getCurrentVersion().raw, r.updateInfo);
         }).catch(err => {
             callback(false, err);
@@ -36,8 +36,6 @@ export default class Updater {
     getCurrentVersion() {
         return autoUpdater.currentVersion;
     }
+}
 
-    notifyUpdate(available, data) {
-        console.log('Update:', available, data);
-    }
-}
\ No newline at end of file
+export type UpdateCheckCallback = (available: boolean, data: UpdateInfo) => void;
diff --git a/src/main.js b/src/main.ts
similarity index 81%
rename from src/main.js
rename to src/main.ts
index 7b5572a..f8950fa 100644
--- a/src/main.js
+++ b/src/main.ts
@@ -1,11 +1,13 @@
 import fs from "fs";
 import path from "path";
+import SingleInstance from "single-instance";
 import {app, BrowserWindow, dialog, ipcMain, Menu, shell, Tray} from "electron";
 
 import Meta from "./Meta";
 import Config from "./Config";
 import Service from "./Service";
 import Updater from "./Updater";
+import Event = Electron.Event;
 
 const resourcesDir = path.resolve(__dirname, '../resources');
 const iconPath = path.resolve(resourcesDir, 'logo.png');
@@ -21,9 +23,9 @@ const solidIcons = listIcons('solid');
 
 let selectedService = 0;
 
-let tray;
-let window;
-let serviceSettingsWindow, settingsWindow;
+let tray: Tray;
+let window: BrowserWindow | null;
+let serviceSettingsWindow: BrowserWindow | null, settingsWindow: BrowserWindow | null;
 
 function toggleMainWindow() {
     if (window != null) {
@@ -41,7 +43,7 @@ async function createWindow() {
     // Check for updates
     updater.checkForUpdates((available, updateInfo) => {
         if (available && updateInfo.version !== config.updateCheckSkip) {
-            dialog.showMessageBox(window, {
+            dialog.showMessageBox(window!, {
                 message: `Version ${updateInfo.version} of tabs is available. Do you wish to download this update?`,
                 buttons: [
                     'Cancel',
@@ -71,7 +73,7 @@ async function createWindow() {
     tray.setToolTip('Tabs');
     tray.setContextMenu(Menu.buildFromTemplate([
         {label: 'Tabs', enabled: false},
-        {label: 'Open Tabs', click: () => window.show()},
+        {label: 'Open Tabs', click: () => window!.show()},
         {type: 'separator'},
         {label: 'Quit', role: 'quit'}
     ]));
@@ -142,7 +144,7 @@ async function createWindow() {
                     enableRemoteModule: true,
                     webviewTag: true,
                 },
-                parent: window,
+                parent: window!,
                 modal: true,
                 autoHideMenuBar: true,
                 height: 850,
@@ -155,10 +157,10 @@ async function createWindow() {
                     mode: 'right'
                 });
             }
-            let syncListener;
+            let syncListener: () => void;
             ipcMain.on('sync-settings', syncListener = () => {
-                serviceSettingsWindow.webContents.send('syncIcons', brandIcons, solidIcons);
-                serviceSettingsWindow.webContents.send('loadService', serviceId, config.services[serviceId]);
+                serviceSettingsWindow!.webContents.send('syncIcons', brandIcons, solidIcons);
+                serviceSettingsWindow!.webContents.send('loadService', serviceId, config.services[serviceId]);
             });
             serviceSettingsWindow.on('close', () => {
                 ipcMain.removeListener('sync-settings', syncListener);
@@ -179,7 +181,7 @@ async function createWindow() {
         }
         config.save();
 
-        window.webContents.send('updateService', id, newService);
+        window!.webContents.send('updateService', id, newService);
     });
 
     ipcMain.on('deleteService', (e, id) => {
@@ -187,7 +189,7 @@ async function createWindow() {
         delete config.services[id];
         config.save();
 
-        window.webContents.send('deleteService', id);
+        window!.webContents.send('deleteService', id);
     });
 
     ipcMain.on('reorderService', (e, serviceId, targetId) => {
@@ -219,10 +221,10 @@ async function createWindow() {
 
     ipcMain.on('updateWindowTitle', (event, serviceId, viewTitle) => {
         if (serviceId === null) {
-            window.setTitle(Meta.title);
+            window!.setTitle(Meta.title);
         } else {
             const service = config.services[serviceId];
-            window.setTitle(Meta.getTitleForService(service, viewTitle));
+            window!.setTitle(Meta.getTitleForService(service, viewTitle));
         }
     });
 
@@ -236,7 +238,7 @@ async function createWindow() {
                     enableRemoteModule: true,
                     webviewTag: true,
                 },
-                parent: window,
+                parent: window!,
                 modal: true,
                 autoHideMenuBar: true,
                 height: 850,
@@ -249,21 +251,21 @@ async function createWindow() {
                     mode: 'right'
                 });
             }
-            let syncListener;
+            let syncListener: () => void;
             ipcMain.on('syncSettings', syncListener = () => {
-                settingsWindow.webContents.send('current-version', updater.getCurrentVersion());
-                settingsWindow.webContents.send('config', config);
+                settingsWindow!.webContents.send('current-version', updater.getCurrentVersion());
+                settingsWindow!.webContents.send('config', config);
             });
 
-            let checkForUpdatesListener;
-            ipcMain.on('checkForUpdates', checkForUpdatesListener = (e) => {
+            let checkForUpdatesListener: () => void;
+            ipcMain.on('checkForUpdates', checkForUpdatesListener = () => {
                 updater.checkForUpdates((available, version) => {
-                    settingsWindow.webContents.send('updateStatus', available, version);
+                    settingsWindow!.webContents.send('updateStatus', available, version);
                 });
             });
 
-            let saveConfigListener;
-            ipcMain.on('save-config', saveConfigListener = (e, data) => {
+            let saveConfigListener: (e: Event, data: any) => void;
+            ipcMain.on('save-config', saveConfigListener = (e: Event, data: any) => {
                 config.update(data);
                 config.save();
                 sendData();
@@ -284,18 +286,18 @@ async function createWindow() {
 
 function sendData() {
     console.log('Syncing data');
-    window.webContents.send('data', Meta.title, brandIcons, solidIcons, selectedService, path.resolve(resourcesDir, 'empty.html'), config);
+    window!.webContents.send('data', Meta.title, brandIcons, solidIcons, selectedService, path.resolve(resourcesDir, 'empty.html'), config);
 }
 
-function setActiveService(index) {
+function setActiveService(index: number) {
     console.log('Selected service is now', index);
     selectedService = index;
 }
 
-function listIcons(set) {
+function listIcons(set: string) {
     console.log('Loading icon set', set);
     const directory = path.resolve(resourcesDir, 'icons/' + set);
-    const icons = [];
+    const icons: { name: string; faIcon: string }[] = [];
     const dir = set === 'brands' ? 'fab' : 'fas';
     fs.readdirSync(directory).forEach(i => icons.push({
         name: i.split('.svg')[0],
@@ -304,7 +306,15 @@ function listIcons(set) {
     return icons;
 }
 
-console.log('Starting app');
-app.on('ready', () => {
-    createWindow().catch(console.error);
+
+// Check if application is already running
+const lock = new SingleInstance('tabs-app');
+lock.lock().then(() => {
+    console.log('Starting app');
+    app.on('ready', () => {
+        createWindow().catch(console.error);
+    });
+}).catch(err => {
+    console.error(err);
+    process.exit(0);
 });
diff --git a/src/types/single-instance.d.ts b/src/types/single-instance.d.ts
new file mode 100644
index 0000000..646177b
--- /dev/null
+++ b/src/types/single-instance.d.ts
@@ -0,0 +1,7 @@
+declare module "single-instance" {
+    export default class SingleInstance {
+        constructor(lockName: string);
+
+        public lock(): Promise<void>;
+    }
+}
\ No newline at end of file
diff --git a/tabs.js b/tabs.js
deleted file mode 100644
index 2bc68be..0000000
--- a/tabs.js
+++ /dev/null
@@ -1,10 +0,0 @@
-#!/bin/electron
-const SingleInstance = require('single-instance');
-const lock = new SingleInstance('tabs-app');
-lock.lock().then(() => {
-    require = require("esm")(module);
-    module.exports = require("./src/main.js");
-}).catch(error => {
-    console.error(error);
-    process.exit(0);
-});
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..f133197
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "module": "CommonJS",
+    "esModuleInterop": true,
+    "outDir": "build",
+    "target": "ES6",
+    "strict": true,
+    "lib": [
+      "es2020",
+      "dom"
+    ],
+    "typeRoots": [
+      "./node_modules/@types",
+      "src/types"
+    ],
+    "baseUrl": ".",
+    "paths": {
+      "*": [
+        "node_modules/*"
+      ]
+    }
+  },
+  "include": [
+    "src/**/*"
+  ]
+}
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 7611e64..21dcbcd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -70,6 +70,11 @@
   resolved "https://registry.npmjs.org/@types/node/-/node-12.12.39.tgz#532d25c1e639d89dd6f3aa1d7b3962e3e7fa943d"
   integrity sha512-pADGfwnDkr6zagDwEiCVE4yQrv7XDkoeVa4OfA9Ju/zRTk6YNDLGtQbkdL4/56mCQQCs4AhNrBIag6jrp7ZuOg==
 
+"@types/node@^12.12.41":
+  version "12.12.41"
+  resolved "https://registry.npmjs.org/@types/node/-/node-12.12.41.tgz#cf48562b53ab6cf85d28dde95f1d06815af275c8"
+  integrity sha512-Q+eSkdYQJ2XK1AJnr4Ji8Gvk3sRDybEwfTvtL9CA25FFUSD2EgZQewN6VCyWYZCXg5MWZdwogdTNBhlWRcWS1w==
+
 "@types/semver@^7.1.0":
   version "7.2.0"
   resolved "https://registry.npmjs.org/@types/semver/-/semver-7.2.0.tgz#0d72066965e910531e1db4621c15d0ca36b8d83b"
@@ -1505,6 +1510,11 @@ typedarray@^0.0.6:
   resolved "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
+typescript@^3.9.3:
+  version "3.9.3"
+  resolved "https://registry.npmjs.org/typescript/-/typescript-3.9.3.tgz#d3ac8883a97c26139e42df5e93eeece33d610b8a"
+  integrity sha512-D/wqnB2xzNFIcoBG9FG8cXRDjiqSTbG2wd8DMZeQyJlP1vfTkIxH4GKveWaEBYySKIg+USu+E+EDIR47SqnaMQ==
+
 unique-string@^2.0.0:
   version "2.0.0"
   resolved "https://registry.npmjs.org/unique-string/-/unique-string-2.0.0.tgz#39c6451f81afb2749de2b233e3f7c5e8843bd89d"