Show dialog if application fails to start up properly

app/global_errors.js

@@ -1,16 +1,43 @@
-const addUnhandledErrorHandler = require('electron-unhandled');
+const electron = require('electron');
 
 const Errors = require('../js/modules/types/errors');
 
-//      addHandler :: Unit -> Unit
+const { app, dialog, clipboard } = electron;
+
+// We're using hard-coded strings in this file because it needs to be ready
+//   to report errors before we do anything in the app. Also, we expect users to directly
+//   paste this text into search engines to find the bugs on GitHub.
+
+function handleError(prefix, error) {
+  console.error(`${prefix}:`, Errors.toLogFormat(error));
+
+  if (app.isReady()) {
+    // title field is not shown on macOS, so we don't use it
+    const buttonIndex = dialog.showMessageBox({
+      buttons: ['OK', 'Copy error'],
+      defaultId: 0,
+      detail: error.stack,
+      message: prefix,
+      noLink: true,
+      type: 'error',
+    });
+
+    if (buttonIndex === 1) {
+      clipboard.writeText(`${prefix}\n${error.stack}`);
+    }
+  } else {
+    dialog.showErrorBox(prefix, error.stack);
+  }
+
+  app.quit();
+}
+
 exports.addHandler = () => {
-  addUnhandledErrorHandler({
-    logger: error => {
-      console.error(
-        'Uncaught error or unhandled promise rejection:',
-        Errors.toLogFormat(error)
-      );
-    },
-    showDialog: false,
+  process.on('uncaughtException', error => {
+    handleError('Unhandled Error', error);
+  });
+
+  process.on('unhandledRejection', error => {
+    handleError('Unhandled Promise Rejection', error);
   });
 };

package.json

@@ -53,7 +53,6 @@
     "config": "1.28.1",
     "electron-editor-context-menu": "1.1.1",
     "electron-is-dev": "0.3.0",
-    "electron-unhandled": "https://github.com/scottnonnenberg-signal/electron-unhandled.git#7496187472aa561d39fcd4c843a54ffbef0a388c",
     "electron-updater": "2.21.10",
     "emoji-datasource": "4.0.0",
     "emoji-datasource-apple": "4.0.0",

yarn.lock

@@ -2520,10 +2520,6 @@ electron-to-chromium@^1.2.7:
   version "1.3.41"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.41.tgz#7e33643e00cd85edfd17e04194f6d00e73737235"
 
-"electron-unhandled@https://github.com/scottnonnenberg-signal/electron-unhandled.git#7496187472aa561d39fcd4c843a54ffbef0a388c":
-  version "1.0.0"
-  resolved "https://github.com/scottnonnenberg-signal/electron-unhandled.git#7496187472aa561d39fcd4c843a54ffbef0a388c"
-
 electron-updater@2.21.10:
   version "2.21.10"
   resolved "https://registry.yarnpkg.com/electron-updater/-/electron-updater-2.21.10.tgz#aa66757ebf966f4247f247a8433af45cfe8e93b0"