diff --git a/app/assets/javascripts/app.js b/app/assets/javascripts/app.ts
similarity index 98%
rename from app/assets/javascripts/app.js
rename to app/assets/javascripts/app.ts
index 797752f9d..a648f718b 100644
--- a/app/assets/javascripts/app.js
+++ b/app/assets/javascripts/app.ts
@@ -1,5 +1,7 @@
 'use strict';
 
+declare const __VERSION__: string
+
 import angular from 'angular';
 import { configRoutes } from './routes';
 
diff --git a/app/assets/javascripts/application.ts b/app/assets/javascripts/application.ts
index 48c3557cc..f6b846289 100644
--- a/app/assets/javascripts/application.ts
+++ b/app/assets/javascripts/application.ts
@@ -40,7 +40,7 @@ export class WebApplication extends SNApplication {
 
   private $compile?: ng.ICompileService
   private scope?: ng.IScope
-  private onDeinit?: (app: SNApplication) => void
+  private onDeinit?: (app: WebApplication) => void
   private webServices!: WebServices
   private currentAuthenticationElement?: JQLite
 
@@ -49,7 +49,7 @@ export class WebApplication extends SNApplication {
     $compile: ng.ICompileService,
     $timeout: ng.ITimeoutService,
     scope: ng.IScope,
-    onDeinit: () => void
+    onDeinit: (app: WebApplication) => void
   ) {
     const namespace = '';
     const deviceInterface = new WebDeviceInterface(namespace, $timeout);
@@ -148,7 +148,9 @@ export class WebApplication extends SNApplication {
     const scope = this.scope!.$new(true) as PasswordWizardScope;
     scope.type = type;
     scope.application = this;
-    const el = this.$compile!("<password-wizard application='application' type='type'></password-wizard>")(scope);
+    const el = this.$compile!(
+      "<password-wizard application='application' type='type'></password-wizard>"
+    )(scope as any);
     angular.element(document.body).append(el);
   }
 
diff --git a/app/assets/javascripts/applicationManager.js b/app/assets/javascripts/applicationManager.ts
similarity index 74%
rename from app/assets/javascripts/applicationManager.js
rename to app/assets/javascripts/applicationManager.ts
index dc3ca3bdd..540b91363 100644
--- a/app/assets/javascripts/applicationManager.js
+++ b/app/assets/javascripts/applicationManager.ts
@@ -12,30 +12,41 @@ import {
   AppState
 } from './services';
 
+type AppManagerChangeCallback = () => void
+
 export class ApplicationManager {
+  
+  $compile: ng.ICompileService
+  $rootScope: ng.IRootScopeService
+  $timeout: ng.ITimeoutService
+  applications: WebApplication[] = []
+  changeObservers: AppManagerChangeCallback[] = []
+  activeApplication?: WebApplication
+
   /* @ngInject */
-  constructor($compile, $rootScope, $timeout) {
+  constructor(
+    $compile: ng.ICompileService,
+    $rootScope: ng.IRootScopeService,
+    $timeout: ng.ITimeoutService
+  ) {
     this.$compile = $compile;
     this.$timeout = $timeout;
     this.$rootScope = $rootScope;
-    this.applications = [];
-    this.changeObservers = [];
     this.onApplicationDeinit = this.onApplicationDeinit.bind(this);
     this.createDefaultApplication();
   }
-  
-  /** @access private */
-  createDefaultApplication() {
+
+  private createDefaultApplication() {
     this.activeApplication = this.createNewApplication();
-    this.applications.push(this.activeApplication);
+    this.applications.push(this.activeApplication!);
     this.notifyObserversOfAppChange();
   }
 
   /** @callback */
-  onApplicationDeinit(application) {
+  onApplicationDeinit(application: WebApplication) {
     removeFromArray(this.applications, application);
-    if(this.activeApplication === application) {
-      this.activeApplication = null;
+    if (this.activeApplication === application) {
+      this.activeApplication = undefined;
     }
     if (this.applications.length === 0) {
       this.createDefaultApplication();
@@ -43,8 +54,7 @@ export class ApplicationManager {
     this.notifyObserversOfAppChange();
   }
 
-  /** @access private */
-  createNewApplication() {
+  private createNewApplication() {
     const scope = this.$rootScope.$new(true);
     const application = new WebApplication(
       this.$compile,
@@ -97,8 +107,7 @@ export class ApplicationManager {
     return this.activeApplication;
   }
 
-  /** @access public */
-  getApplications() {
+  public getApplications() {
     return this.applications.slice();
   }
 
@@ -106,20 +115,17 @@ export class ApplicationManager {
    * Notifies observer when the active application has changed.
    * Any application which is no longer active is destroyed, and
    * must be removed from the interface.
-   * @access public
-   * @param {function} callback 
    */
-  addApplicationChangeObserver(callback) {
+  public addApplicationChangeObserver(callback: AppManagerChangeCallback) {
     this.changeObservers.push(callback);
     if (this.application) {
       callback();
     }
   }
 
-  notifyObserversOfAppChange() {
+  private notifyObserversOfAppChange() {
     for (const observer of this.changeObservers) {
       observer();
     }
   }
-
 }
\ No newline at end of file
diff --git a/app/assets/javascripts/controllers/editor.js b/app/assets/javascripts/controllers/editor.js
index bcabbc170..3330caac1 100644
--- a/app/assets/javascripts/controllers/editor.js
+++ b/app/assets/javascripts/controllers/editor.js
@@ -545,10 +545,10 @@ class EditorCtrl extends PureCtrl {
       const title = this.state.note.safeTitle().length
         ? `'${this.state.note.title}'`
         : "this note";
-      const text = StringDeleteNote({
-        title: title,
-        permanently: permanently
-      });
+      const text = StringDeleteNote(
+        title,
+        permanently
+      );
       this.application.alertService.confirm({
         text: text,
         destructive: true,
@@ -616,7 +616,7 @@ class EditorCtrl extends PureCtrl {
   emptyTrash() {
     const count = this.getTrashCount();
     this.application.alertService.confirm({
-      text: StringEmptyTrash({ count }),
+      text: StringEmptyTrash(count),
       destructive: true,
       onConfirm: () => {
         this.application.emptyTrash();
diff --git a/app/assets/javascripts/database.js b/app/assets/javascripts/database.ts
similarity index 70%
rename from app/assets/javascripts/database.js
rename to app/assets/javascripts/database.ts
index 6401f873f..42f05e4d7 100644
--- a/app/assets/javascripts/database.js
+++ b/app/assets/javascripts/database.ts
@@ -1,3 +1,6 @@
+import { WebApplication } from './application';
+import { SNAlertService } from "../../../../snjs/dist/@types";
+
 const DB_NAME = 'standardnotes';
 const STORE_NAME = 'items';
 const READ_WRITE = 'readwrite';
@@ -15,37 +18,34 @@ const DB_DELETION_BLOCKED =
 const QUOTE_EXCEEDED_ERROR = 'QuotaExceededError';
 
 export class Database {
-  constructor() {
-    this.locked = true;
+
+  private locked = true
+  private alertService?: SNAlertService
+  private db?: IDBDatabase
+
+  public deinit() {
+    this.alertService = undefined;
+    this.db = undefined;
   }
 
-  /** @access public */
-  deinit() {
-    this.alertService = null;
-    this.db = null;
-  }
-
-  /** @access public */
-  setApplication(application) {
-    this.alertService = application.alertService;
+  public setAlertService(alertService: SNAlertService) {
+    this.alertService = alertService;
   }
 
   /**
    * Relinquishes the lock and allows db operations to proceed
-   * @access public
    */
-  unlock() {
+  public unlock() {
     this.locked = false;
   }
 
   /**
    * Opens the database natively, or returns the existing database object if already opened.
-   * @access public
-   * @param {function} onNewDatabase - Callback to invoke when a database has been created
+   * @param onNewDatabase - Callback to invoke when a database has been created
    * as part of the open process. This can happen on new application sessions, or if the 
    * browser deleted the database without the user being aware.
    */
-  async openDatabase(onNewDatabase) {
+  public async openDatabase(onNewDatabase?: () => void): Promise<IDBDatabase | undefined> {
     if (this.locked) {
       throw Error('Attempting to open locked database');
     }
@@ -55,8 +55,9 @@ export class Database {
     const request = window.indexedDB.open(DB_NAME, 1);
     return new Promise((resolve, reject) => {
       request.onerror = (event) => {
-        if (event.target.errorCode) {
-          this.showAlert('Offline database issue: ' + event.target.errorCode);
+        const target = event!.target! as any;
+        if (target.errorCode) {
+          this.showAlert('Offline database issue: ' + target.errorCode);
         } else {
           this.displayOfflineAlert();
         }
@@ -66,18 +67,21 @@ export class Database {
         reject(Error('IndexedDB open request blocked'));
       };
       request.onsuccess = (event) => {
-        const db = event.target.result;
+        const target = event!.target! as IDBOpenDBRequest;
+        const db = target.result;
         db.onversionchange = () => {
           db.close();
         };
         db.onerror = (errorEvent) => {
-          throw Error('Database error: ' + errorEvent.target.errorCode);
+          const target = errorEvent?.target as any;
+          throw Error('Database error: ' + target.errorCode);
         };
         this.db = db;
         resolve(db);
       };
       request.onupgradeneeded = (event) => {
-        const db = event.target.result;
+        const target = event!.target! as IDBOpenDBRequest;
+        const db = target.result;
         db.onversionchange = () => {
           db.close();
         };
@@ -94,24 +98,24 @@ export class Database {
         objectStore.transaction.oncomplete = () => {
           /* Ready to store values in the newly created objectStore. */
           if (db.version === 1 && onNewDatabase) {
-            onNewDatabase();
+            onNewDatabase && onNewDatabase();
           }
         };
       };
     });
   }
 
-  /** @access public */
-  async getAllPayloads() {
-    const db = await this.openDatabase();
-    return new Promise((resolve, reject) => {
+  public async getAllPayloads() {
+    const db = (await this.openDatabase())!;
+    return new Promise((resolve) => {
       const objectStore =
         db.transaction(STORE_NAME).
           objectStore(STORE_NAME);
-      const payloads = [];
+      const payloads: any = [];
       const cursorRequest = objectStore.openCursor();
       cursorRequest.onsuccess = (event) => {
-        const cursor = event.target.result;
+        const target = event!.target! as any;
+        const cursor = target.result;
         if (cursor) {
           payloads.push(cursor.value);
           cursor.continue();
@@ -122,28 +126,25 @@ export class Database {
     });
   }
 
-  /** @access public */
-  async savePayload(payload) {
+  public async savePayload(payload: any) {
     return this.savePayloads([payload]);
   }
 
-  /** @access public */
-  async savePayloads(payloads) {
+  public async savePayloads(payloads: any[]) {
     if (payloads.length === 0) {
       return;
     }
-    const db = await this.openDatabase();
+    const db = (await this.openDatabase())!;
     const transaction = db.transaction(STORE_NAME, READ_WRITE);
     return new Promise((resolve, reject) => {
       transaction.oncomplete = () => { };
       transaction.onerror = (event) => {
-        this.showGenericError(event.target.error);
-      };
-      transaction.onblocked = (event) => {
-        this.showGenericError(event.target.error);
+        const target = event!.target! as any;
+        this.showGenericError(target.error);
       };
       transaction.onabort = (event) => {
-        const error = event.target.error;
+        const target = event!.target! as any;
+        const error = target.error;
         if (error.name === QUOTE_EXCEEDED_ERROR) {
           this.showAlert(OUT_OF_SPACE);
         } else {
@@ -156,10 +157,9 @@ export class Database {
     });
   }
 
-  /** @access private */
-  putItems(objectStore, items) {
+  private putItems(objectStore: IDBObjectStore, items: any[]) {
     return Promise.all(items.map((item) => {
-      return new Promise((resolve, reject) => {
+      return new Promise((resolve) => {
         const request = objectStore.put(item);
         request.onerror = resolve;
         request.onsuccess = resolve;
@@ -167,9 +167,8 @@ export class Database {
     }));
   }
 
-  /** @access public */
-  async deletePayload(uuid) {
-    const db = await this.openDatabase();
+  public async deletePayload(uuid: string) {
+    const db = (await this.openDatabase())!;
     return new Promise((resolve, reject) => {
       const request =
         db.transaction(STORE_NAME, READ_WRITE)
@@ -180,15 +179,14 @@ export class Database {
     });
   }
 
-  /** @access public */
-  async clearAllPayloads() {
+  public async clearAllPayloads() {
     const deleteRequest = window.indexedDB.deleteDatabase(DB_NAME);
     return new Promise((resolve, reject) => {
       deleteRequest.onerror = () => {
         reject(Error('Error deleting database.'));
       };
       deleteRequest.onsuccess = () => {
-        this.db = null;
+        this.db = undefined;
         resolve();
       };
       deleteRequest.onblocked = (event) => {
@@ -198,30 +196,24 @@ export class Database {
     });
   }
 
-  /** @access private */
-  showAlert(message) {
-    this.alertService.alert({ text: message });
+  private showAlert(message: string) {
+    this.alertService!.alert(message);
   }
 
-  /** 
-   * @access private 
-   * @param {object} error - {code, name}
-   */
-  showGenericError(error) {
+  private showGenericError(error: {code: number, name: string}) {
     const message =
       `Unable to save changes locally due to an unknown system issue. ` +
       `Issue Code: ${error.code} Issue Name: ${error.name}.`;
     this.showAlert(message);
   }
 
-  /** @access private */
-  displayOfflineAlert() {
+  private displayOfflineAlert() {
     const message =
       "There was an issue loading your offline database. This could happen for two reasons:" +
       "\n\n1. You're in a private window in your browser. We can't save your data without " +
       "access to the local database. Please use a non-private window." +
       "\n\n2. You have two windows of the app open at the same time. " +
       "Please close any other app instances and reload the page.";
-    this.alertService.alert({ text: message });
+    this.alertService!.alert(message);
   }
-}
+}
\ No newline at end of file
diff --git a/app/assets/javascripts/directives/views/accountMenu.js b/app/assets/javascripts/directives/views/accountMenu.js
index 7f87960e6..daf9581cc 100644
--- a/app/assets/javascripts/directives/views/accountMenu.js
+++ b/app/assets/javascripts/directives/views/accountMenu.js
@@ -379,7 +379,7 @@ class AccountMenuCtrl extends PureCtrl {
       importData: null
     });
     if (errorCount > 0) {
-      const message = StringImportError({ errorCount: errorCount });
+      const message = StringImportError(errorCount);
       this.application.alertService.alert({
         text: message
       });
diff --git a/app/assets/javascripts/directives/views/panelResizer.js b/app/assets/javascripts/directives/views/panelResizer.js
index a98614f90..10d360205 100644
--- a/app/assets/javascripts/directives/views/panelResizer.js
+++ b/app/assets/javascripts/directives/views/panelResizer.js
@@ -117,7 +117,7 @@ class PanelResizerCtrl {
   }
 
   handleResize() {
-    debounce(() => {
+    debounce(this, () => {
       this.reloadDefaultValues();
       this.handleWidthEvent();
       this.$timeout(() => {
diff --git a/app/assets/javascripts/index.js b/app/assets/javascripts/index.ts
similarity index 100%
rename from app/assets/javascripts/index.js
rename to app/assets/javascripts/index.ts
diff --git a/app/assets/javascripts/strings.js b/app/assets/javascripts/strings.ts
similarity index 94%
rename from app/assets/javascripts/strings.js
rename to app/assets/javascripts/strings.ts
index 6130a8cab..c8a027953 100644
--- a/app/assets/javascripts/strings.js
+++ b/app/assets/javascripts/strings.ts
@@ -2,7 +2,7 @@
 export const STRING_SESSION_EXPIRED = "Your session has expired. New changes will not be pulled in. Please sign out and sign back in to refresh your session.";
 export const STRING_DEFAULT_FILE_ERROR = "Please use FileSafe or the Bold Editor to attach images and files. Learn more at standardnotes.org/filesafe.";
 export const STRING_GENERIC_SYNC_ERROR = "There was an error syncing. Please try again. If all else fails, try signing out and signing back in.";
-export function StringSyncException(data) {
+export function StringSyncException(data: any) {
   return `There was an error while trying to save your items. Please contact support and share this message: ${data}.`;
 }
 
@@ -19,12 +19,12 @@ export const STRING_ELLIPSES = "...";
 export const STRING_GENERIC_SAVE_ERROR = "There was an error saving your note. Please try again.";
 export const STRING_DELETE_PLACEHOLDER_ATTEMPT = "This note is a placeholder and cannot be deleted. To remove from your list, simply navigate to a different note.";
 export const STRING_DELETE_LOCKED_ATTEMPT = "This note is locked. If you'd like to delete it, unlock it, and try again.";
-export function StringDeleteNote({ title, permanently }) {
+export function StringDeleteNote(title: string, permanently: boolean) {
   return permanently
     ? `Are you sure you want to permanently delete ${title}?`
     : `Are you sure you want to move ${title} to the trash?`;
 }
-export function StringEmptyTrash({ count }) {
+export function StringEmptyTrash(count: number) {
   return `Are you sure you want to permanently delete ${count} note(s)?`;
 }
 
@@ -43,7 +43,7 @@ export const STRING_NON_MATCHING_PASSWORDS = "The two passwords you entered do n
 export const STRING_GENERATING_LOGIN_KEYS = "Generating Login Keys...";
 export const STRING_GENERATING_REGISTER_KEYS = "Generating Account Keys...";
 export const STRING_INVALID_IMPORT_FILE = "Unable to open file. Ensure it is a proper JSON file and try again.";
-export function StringImportError({ errorCount }) {
+export function StringImportError(errorCount: number) {
   return `Import complete. ${errorCount} items were not imported because there was an error decrypting them. Make sure the password is correct and try again.`;
 }
 
diff --git a/app/assets/javascripts/utils.js b/app/assets/javascripts/utils.ts
similarity index 71%
rename from app/assets/javascripts/utils.js
rename to app/assets/javascripts/utils.ts
index 008c58d53..1344dffdf 100644
--- a/app/assets/javascripts/utils.js
+++ b/app/assets/javascripts/utils.ts
@@ -1,4 +1,4 @@
-export function getParameterByName(name, url) {
+export function getParameterByName(name: string, url: string) {
   name = name.replace(/[[\]]/g, '\\$&');
   var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)');
   var results = regex.exec(url);
@@ -7,48 +7,14 @@ export function getParameterByName(name, url) {
   return decodeURIComponent(results[2].replace(/\+/g, ' '));
 }
 
-export function parametersFromURL(url) {
-  url = url.split('?').slice(-1)[0];
-  var obj = {};
-  url.replace(/([^=&]+)=([^&]*)/g, function(m, key, value) {
-    obj[decodeURIComponent(key)] = decodeURIComponent(value);
-  });
-  return obj;
-}
-
-export function isNullOrUndefined(value) {
+export function isNullOrUndefined(value: any) {
   return value === null || value === undefined;
 }
 
-export function dictToArray(dict) {
+export function dictToArray(dict: any) {
   return Object.keys(dict).map((key) => dict[key]);
 }
 
-export function humanReadableList(array) {
-  const addSeparator = (index, length) => {
-    if (index > 0) {
-      if (index === length - 1) {
-        if (length === 2) {
-          return ' and ';
-        } else {
-          return ', and ';
-        }
-      } else {
-        return ', ';
-      }
-    }
-    return '';
-  };
-
-  let result = '';
-  for (let i = 0; i < array.length; i++) {
-    const value = array[i];
-    result += addSeparator(i, array.length);
-    result += value;
-  }
-  return result;
-}
-
 export function getPlatformString() {
   try {
     const platform = navigator.platform.toLowerCase();
@@ -67,8 +33,8 @@ export function getPlatformString() {
   }
 }
 
-let sharedDateFormatter;
-export function dateToLocalizedString(date) {
+let sharedDateFormatter: Intl.DateTimeFormat;
+export function dateToLocalizedString(date: Date) {
   if (typeof Intl !== 'undefined' && Intl.DateTimeFormat) {
     if (!sharedDateFormatter) {
       const locale = (
@@ -94,9 +60,9 @@ export function dateToLocalizedString(date) {
 }
 
 /** Via https://davidwalsh.name/javascript-debounce-function */
-export function debounce(func, wait, immediate) {
-  let timeout;
-  return function () {
+export function debounce(this: any, func: any, wait: number, immediate: boolean) {
+  let timeout: any;
+  return () => {
     const context = this;
     const args = arguments;
     const later = function () {
@@ -111,20 +77,14 @@ export function debounce(func, wait, immediate) {
 };
 
 export function isDesktopApplication() {
-  return window.isElectron;
+  return (window as any).isElectron;
 }
 
-/* Use with numbers and strings, not objects */
-// eslint-disable-next-line no-extend-native
-Array.prototype.containsPrimitiveSubset = function(array) {
-  return !array.some(val => this.indexOf(val) === -1);
-};
-
 // https://tc39.github.io/ecma262/#sec-array.prototype.includes
 if (!Array.prototype.includes) {
   // eslint-disable-next-line no-extend-native
   Object.defineProperty(Array.prototype, 'includes', {
-    value: function(searchElement, fromIndex) {
+    value: function(searchElement: any, fromIndex: number) {
       if (this == null) {
         throw new TypeError('"this" is null or not defined');
       }
@@ -151,7 +111,7 @@ if (!Array.prototype.includes) {
       //  b. If k < 0, let k be 0.
       var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
 
-      function sameValueZero(x, y) {
+      function sameValueZero(x: number, y: number) {
         return (
           x === y ||
           (typeof x === 'number' &&
diff --git a/app/assets/javascripts/web_device_interface.ts b/app/assets/javascripts/web_device_interface.ts
index 7cc29e4dc..2e01f34a9 100644
--- a/app/assets/javascripts/web_device_interface.ts
+++ b/app/assets/javascripts/web_device_interface.ts
@@ -17,7 +17,7 @@ export class WebDeviceInterface extends DeviceInterface {
   }
 
   setApplication(application: SNApplication) {
-    this.database.setApplication(application);
+    this.database.setAlertService(application.alertService!);
   }
 
   deinit() {