fix AboutWindowInfo type is not found (fixes #71)

src/index.ts

@@ -2,6 +2,50 @@ import { app as appMain, BrowserWindow as BrowserWindowMain, shell, ipcMain } fr
 import { statSync } from 'fs';
 import * as path from 'path';
 
+export interface LicenseEntry {
+    type: string;
+    url: string;
+}
+
+export interface PackageJson {
+    productName?: string;
+    description?: string;
+    homepage?: string;
+    license?: string | LicenseEntry;
+    bugs?: {
+        url: string;
+    };
+}
+
+export interface AboutWindowInfo {
+    icon_path: string;
+    product_name?: string;
+    copyright?: string;
+    homepage?: string;
+    description?: string;
+    package_json_dir?: string;
+    about_page_dir?: string;
+    license?: string;
+    bug_report_url?: string;
+    css_path?: string | string[];
+    adjust_window_size?: boolean;
+    win_options?: Electron.BrowserWindowConstructorOptions;
+    open_devtools?: boolean;
+    use_inner_html?: boolean;
+    bug_link_text?: string;
+    use_version_info?: boolean | [string, string][];
+    show_close_button?: string;
+    app?: Electron.App;
+    BrowserWindow?: typeof Electron.BrowserWindow;
+    ipcMain?: Electron.IpcMain;
+}
+
+declare namespace NodeJS {
+    interface ProcessVersions {
+        [name: string]: string;
+    }
+}
+
 function loadPackageJson(pkg_path: string): PackageJson {
     try {
         return require(pkg_path);

src/renderer.ts

@@ -1,4 +1,5 @@
 import { ipcRenderer, shell } from 'electron';
+import type { AboutWindowInfo } from './index';
 
 ipcRenderer.on('about-window:info', (_: any, info: AboutWindowInfo, app_name: string, version: string) => {
     // Note: app.getName() was replaced with app.name at Electron v7