fix: file download dom exception (#863)

Author: amanharwara

app/enableExperimentalWebFeatures.ts

@@ -0,0 +1,16 @@
+import { app } from 'electron'
+
+/**
+ * @FIXME
+ * Due to a bug in Electron (https://github.com/electron/electron/issues/28422),
+ * downloading a file using the File System Access API does not work, causing an exception:
+ * "Uncaught DOMException: The request is not allowed by the user agent or the platform in the current context."
+ *
+ * The following workaround fixes the issue by enabling experimental web platform features
+ * which makes the file system access permission always be true.
+ *
+ * Since this workaround involves enabling experimental features, it could lead
+ * to other issues. This should be removed as soon as the upstream bug is fixed.
+ */
+export const enableExperimentalFeaturesForFileAccessFix = () =>
+  app.commandLine.appendSwitch('enable-experimental-web-platform-features')

app/index.ts

@@ -10,6 +10,9 @@ import { setupTesting } from './javascripts/Main/Utils/Testing'
 import { CommandLineArgs } from './javascripts/Shared/CommandLineArgs'
 import { Store, StoreKeys } from './javascripts/Main/Store'
 import { Paths } from './javascripts/Main/Types/Paths'
+import { enableExperimentalFeaturesForFileAccessFix } from './enableExperimentalWebFeatures'
+
+enableExperimentalFeaturesForFileAccessFix()
 
 require('@electron/remote/main').initialize()