port app/index and it's referenced files to ts

app/ext-modules.d.ts

@@ -0,0 +1,3 @@
+declare module 'git-describe' {
+  export function gitDescribe(...args: any[]): void;
+}

app/index.d.ts

@@ -0,0 +1 @@
+// Dummy file, required by tsc

app/index.ts

@@ -1,5 +1,6 @@
 // Print diagnostic information for a few arguments instead of running Hyper.
 if (['--help', '-v', '--version'].includes(process.argv[1])) {
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
   const {version} = require('./package');
   const configLocation = process.platform === 'win32' ? `${process.env.userprofile}\\.hyper.js` : '~/.hyper.js';
   //eslint-disable-next-line no-console
@@ -25,6 +26,7 @@ const checkSquirrel = () => {
 
 // handle startup squirrel events
 if (process.platform === 'win32') {
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
   const systemContextMenu = require('./system-context-menu');
 
   switch (process.argv[1]) {
@@ -53,16 +55,38 @@ import {gitDescribe} from 'git-describe';
 import isDev from 'electron-is-dev';
 import * as config from './config';
 
+// Hack - this declararion doesn't work when put into ./ext-modules.d.ts for some reason so it's in this file for the time being
+declare module 'electron' {
+  interface App {
+    config: typeof import('./config');
+    plugins: typeof import('./plugins');
+    getWindows: () => Set<BrowserWindow>;
+    getLastFocusedWindow: () => BrowserWindow | null;
+    windowCallback: (win: BrowserWindow) => void;
+    createWindow: (fn?: (win: BrowserWindow) => void, options?: Record<string, any>) => BrowserWindow;
+    setVersion: (version: string) => void;
+  }
+
+  type Server = import('./rpc').Server;
+  interface BrowserWindow {
+    uid: string;
+    sessions: Map<any, any>;
+    focusTime: number;
+    clean: () => void;
+    rpc: Server;
+  }
+}
+
 // set up config
 config.setup();
 
 import * as plugins from './plugins';
 import {installCLI} from './utils/cli-install';
 import * as AppMenu from './menus/menu';
-import Window from './ui/window';
+import {newWindow} from './ui/window';
 import * as windowUtils from './utils/window-utils';
 
-const windowSet = new Set([]);
+const windowSet = new Set<BrowserWindow>([]);
 
 // expose to plugins
 app.config = config;
@@ -89,7 +113,7 @@ if (isDev) {
   console.log('running in dev mode');
 
   // Override default appVersion which is set from package.json
-  gitDescribe({customArguments: ['--tags']}, (error, gitInfo) => {
+  gitDescribe({customArguments: ['--tags']}, (error: any, gitInfo: any) => {
     if (!error) {
       app.setVersion(gitInfo.raw);
     }
@@ -103,16 +127,30 @@ const url = `file://${resolve(isDev ? __dirname : app.getAppPath(), 'index.html'
 //eslint-disable-next-line no-console
 console.log('electron will open', url);
 
+function installDevExtensions(isDev_: boolean) {
+  if (!isDev_) {
+    return Promise.resolve([]);
+  }
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
+  const installer = require('electron-devtools-installer') as typeof import('electron-devtools-installer');
+
+  const extensions = ['REACT_DEVELOPER_TOOLS', 'REDUX_DEVTOOLS'] as const;
+  const forceDownload = Boolean(process.env.UPGRADE_EXTENSIONS);
+
+  return Promise.all(extensions.map(name => installer.default(installer[name], forceDownload)));
+}
+
 app.on('ready', () =>
   installDevExtensions(isDev)
     .then(() => {
-      function createWindow(fn, options = {}) {
+      function createWindow(fn?: (win: BrowserWindow) => void, options: Record<string, any> = {}) {
         const cfg = plugins.getDecoratedConfig();
 
         const winSet = config.getWin();
         let [startX, startY] = winSet.position;
 
         const [width, height] = options.size ? options.size : cfg.windowSize || winSet.size;
+        // eslint-disable-next-line @typescript-eslint/no-var-requires
         const {screen} = require('electron');
 
         const winPos = options.position;
@@ -150,7 +188,7 @@ app.on('ready', () =>
           [startX, startY] = config.windowDefaults.windowPosition;
         }
 
-        const hwin = new Window({width, height, x: startX, y: startY}, cfg, fn);
+        const hwin = newWindow({width, height, x: startX, y: startY}, cfg, fn);
         windowSet.add(hwin);
         hwin.loadURL(url);
 
@@ -229,7 +267,7 @@ app.on('ready', () =>
 
 app.on('open-file', (event, path) => {
   const lastWindow = app.getLastFocusedWindow();
-  const callback = win => win.rpc.emit('open file', {path});
+  const callback = (win: BrowserWindow) => win.rpc.emit('open file', {path});
   if (lastWindow) {
     callback(lastWindow);
   } else if (!lastWindow && {}.hasOwnProperty.call(app, 'createWindow')) {
@@ -243,7 +281,7 @@ app.on('open-file', (event, path) => {
 
 app.on('open-url', (event, sshUrl) => {
   const lastWindow = app.getLastFocusedWindow();
-  const callback = win => win.rpc.emit('open ssh', sshUrl);
+  const callback = (win: BrowserWindow) => win.rpc.emit('open ssh', sshUrl);
   if (lastWindow) {
     callback(lastWindow);
   } else if (!lastWindow && {}.hasOwnProperty.call(app, 'createWindow')) {
@@ -254,15 +292,3 @@ app.on('open-url', (event, sshUrl) => {
     app.windowCallback = callback;
   }
 });
-
-function installDevExtensions(isDev_) {
-  if (!isDev_) {
-    return Promise.resolve();
-  }
-  const installer = require('electron-devtools-installer');
-
-  const extensions = ['REACT_DEVELOPER_TOOLS', 'REDUX_DEVTOOLS'];
-  const forceDownload = Boolean(process.env.UPGRADE_EXTENSIONS);
-
-  return Promise.all(extensions.map(name => installer.default(installer[name], forceDownload)));
-}

app/menus/menu.ts

@@ -1,5 +1,5 @@
 // Packages
-import {app, dialog, Menu} from 'electron';
+import {app, dialog, Menu, BrowserWindow} from 'electron';
 
 // Utilities
 import {getConfig} from '../config';
@@ -18,13 +18,16 @@ import {getRendererTypes} from '../utils/renderer-utils';
 const appName = app.getName();
 const appVersion = app.getVersion();
 
-let menu_ = [];
+let menu_: Menu;
 
-export const createMenu = (createWindow, getLoadedPluginVersions) => {
+export const createMenu = (
+  createWindow: (fn?: (win: BrowserWindow) => void, options?: Record<string, any>) => BrowserWindow,
+  getLoadedPluginVersions: () => {name: string; version: string}[]
+) => {
   const config = getConfig();
   // We take only first shortcut in array for each command
   const allCommandKeys = getDecoratedKeymaps();
-  const commandKeys = Object.keys(allCommandKeys).reduce((result, command) => {
+  const commandKeys = Object.keys(allCommandKeys).reduce((result: Record<string, string>, command) => {
     result[command] = allCommandKeys[command][0];
     return result;
   }, {});
@@ -40,7 +43,7 @@ export const createMenu = (createWindow, getLoadedPluginVersions) => {
     const pluginList =
       loadedPlugins.length === 0 ? 'none' : loadedPlugins.map(plugin => `\n  ${plugin.name} (${plugin.version})`);
 
-    const rendererCounts = Object.values(getRendererTypes()).reduce((acc, type) => {
+    const rendererCounts = Object.values(getRendererTypes()).reduce((acc: Record<string, number>, type) => {
       acc[type] = acc[type] ? acc[type] + 1 : 1;
       return acc;
     }, {});
@@ -53,7 +56,7 @@ export const createMenu = (createWindow, getLoadedPluginVersions) => {
       message: `${appName} ${appVersion} (${updateChannel})`,
       detail: `Renderers: ${renderers}\nPlugins: ${pluginList}\n\nCreated by Guillermo Rauch\nCopyright © 2019 ZEIT, Inc.`,
       buttons: [],
-      icon
+      icon: icon as any
     });
   };
   const menu = [
@@ -69,7 +72,7 @@ export const createMenu = (createWindow, getLoadedPluginVersions) => {
   return menu;
 };
 
-export const buildMenu = template => {
+export const buildMenu = (template: Electron.MenuItemConstructorOptions[]): Electron.Menu => {
   menu_ = Menu.buildFromTemplate(template);
   return menu_;
 };

app/rpc.ts

@@ -1,9 +1,12 @@
 import {EventEmitter} from 'events';
-import {ipcMain} from 'electron';
+import {ipcMain, BrowserWindow} from 'electron';
 import uuid from 'uuid';
 
-class Server extends EventEmitter {
-  constructor(win) {
+export class Server extends EventEmitter {
+  destroyed = false;
+  win: BrowserWindow;
+  id!: string;
+  constructor(win: BrowserWindow) {
     super();
     this.win = win;
     this.ipcListener = this.ipcListener.bind(this);
@@ -29,11 +32,11 @@ class Server extends EventEmitter {
     return this.win.webContents;
   }
 
-  ipcListener(event, {ev, data}) {
+  ipcListener(event: any, {ev, data}: {ev: string; data: any}) {
     super.emit(ev, data);
   }
 
-  emit(ch, data) {
+  emit(ch: string, data: any): any {
     // This check is needed because data-batching can cause extra data to be
     // emitted after the window has already closed
     if (!this.win.isDestroyed()) {
@@ -53,6 +56,6 @@ class Server extends EventEmitter {
   }
 }
 
-export default win => {
+export default (win: BrowserWindow) => {
   return new Server(win);
 };