feat: defer initializing i18n at backend startup

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/node/arduino-ide-backend-module.ts

@@ -103,8 +103,8 @@ import WebSocketProviderImpl from './web-socket/web-socket-provider-impl';
 import { WebSocketProvider } from './web-socket/web-socket-provider';
 import { ClangFormatter } from './clang-formatter';
 import { FormatterPath } from '../common/protocol/formatter';
-import { HostedPluginLocalizationService } from './theia/plugin-ext/hosted-plugin-localization-service';
-import { HostedPluginLocalizationService as TheiaHostedPluginLocalizationService } from '@theia/plugin-ext/lib/hosted/node/hosted-plugin-localization-service';
+import { LocalizationBackendContribution } from '@theia/core/lib/node/i18n/localization-backend-contribution';
+import { PluginLocalizationBackendContribution } from './theia/plugin-ext/plugin-localization-backend-contribution';
 import { SurveyNotificationServiceImpl } from './survey-service-impl';
 import {
   SurveyNotificationService,
@@ -374,9 +374,9 @@ export default new ContainerModule((bind, unbind, isBound, rebind) => {
   bind(BackendApplicationContribution).toService(PlotterBackendContribution);
   bind(ArduinoLocalizationContribution).toSelf().inSingletonScope();
   bind(LocalizationContribution).toService(ArduinoLocalizationContribution);
-  bind(HostedPluginLocalizationService).toSelf().inSingletonScope();
-  rebind(TheiaHostedPluginLocalizationService).toService(
-    HostedPluginLocalizationService
+  bind(PluginLocalizationBackendContribution).toSelf().inSingletonScope();
+  rebind(LocalizationBackendContribution).toService(
+    PluginLocalizationBackendContribution
   );
 
   // Survey notification bindings

arduino-ide-extension/src/node/theia/plugin-ext/plugin-localization-backend-contribution.ts

@@ -0,0 +1,25 @@
+import { injectable, postConstruct } from '@theia/core/shared/inversify';
+import { PluginLocalizationBackendContribution as TheiaPluginLocalizationBackendContribution } from '@theia/plugin-ext/lib/main/node/plugin-localization-backend-contribution';
+
+@injectable()
+export class PluginLocalizationBackendContribution extends TheiaPluginLocalizationBackendContribution {
+  @postConstruct()
+  protected init(): void {
+    this.pluginDeployer.onDidDeploy(() => {
+      this.pluginsDeployed.resolve();
+    });
+  }
+
+  override async initialize(): Promise<void> {
+    // Unlike Theia, IDE2 does not await here.
+    // Otherwise the backend app startup is blocked until all translations are read.
+    // https://github.com/eclipse-theia/theia/blob/cb426569d1d5fe42567f5ec5d35b3c77a92f3295/packages/core/src/node/i18n/localization-backend-contribution.ts#L36-L37
+    this.localizationRegistry
+      .initialize()
+      .then(() => this.initialized.resolve());
+  }
+
+  override async waitForInitialization(): Promise<void> {
+    await Promise.all([this.initialized.promise, this.pluginsDeployed.promise]);
+  }
+}