fix: prevent crashing by registering a configuration key

src/extensions.ts

@@ -10,6 +10,9 @@ import { StandaloneServices } from 'vs/editor/standalone/browser/standaloneServi
 import { getExtensionId } from 'vs/platform/extensionManagement/common/extensionManagementUtil'
 import { IDisposable } from 'vs/base/common/lifecycle'
 import Severity from 'vs/base/common/severity'
+import { localize } from 'vs/nls'
+import { Registry } from 'vs/platform/registry/common/platform'
+import { ConfigurationScope, IConfigurationRegistry, Extensions as ConfigurationExtensions } from 'vs/platform/configuration/common/configurationRegistry'
 import * as api from './api'
 import { registerExtensionFile } from './service-override/files'
 import createLanguagesApi from './vscode-services/languages'
@@ -32,6 +35,19 @@ export function consoleExtensionMessageHandler (msg: IMessage): void {
   }
 }
 
+// Required or it crashed on extensions with activationEvents
+const configurationRegistry = Registry.as<IConfigurationRegistry>(ConfigurationExtensions.Configuration)
+configurationRegistry.registerConfiguration({
+  properties: {
+    'search.useIgnoreFiles': {
+      type: 'boolean',
+      markdownDescription: localize('useIgnoreFiles', 'Controls whether to use `.gitignore` and `.ignore` files when searching for files.'),
+      default: true,
+      scope: ConfigurationScope.RESOURCE
+    }
+  }
+})
+
 let DEFAULT_EXTENSION: IExtensionDescription = {
   identifier: new ExtensionIdentifier('monaco'),
   isBuiltin: true,