private createProjectService()

in server/src/session.ts [105:165]
46 lines of code
2 McCabe index (conditional complexity)

  private createProjectService(options: SessionOptions): ts.server.ProjectService {
    const projSvc = new ts.server.ProjectService({
      host: options.host,
      logger: options.logger,
      cancellationToken: ts.server.nullCancellationToken,
      useSingleInferredProject: true,
      useInferredProjectPerProjectRoot: true,
      typingsInstaller: ts.server.nullTypingsInstaller,
      // Not supressing diagnostic events can cause a type error to be thrown when the
      // language server session gets an event for a file that is outside the project
      // managed by the project service, and for which a program does not exist in the
      // corresponding project's language service.
      // See https://github.com/angular/vscode-ng-language-service/issues/693
      suppressDiagnosticEvents: true,
      eventHandler: (e) => this.handleProjectServiceEvent(e),
      globalPlugins: [options.ngPlugin],
      pluginProbeLocations: [options.resolvedNgLsPath],
      // do not resolve plugins from the directory where tsconfig.json is located
      allowLocalPluginLoads: false,
      session: undefined,
    });

    projSvc.setHostConfiguration({
      formatOptions: projSvc.getHostFormatCodeOptions(),
      extraFileExtensions: [
        {
          // TODO: in View Engine getExternalFiles() returns a list of external
          // templates (HTML files). This configuration is no longer needed in
          // Ivy because Ivy returns the typecheck files.
          extension: '.html',
          isMixedContent: false,
          scriptKind: ts.ScriptKind.Unknown,
        },
      ],
      preferences: {
        // We don't want the AutoImportProvider projects to be created. See
        // https://devblogs.microsoft.com/typescript/announcing-typescript-4-0/#smarter-auto-imports
        includePackageJsonAutoImports: 'off',
      },
      watchOptions: {
        // Used as watch options when not specified by user's `tsconfig`.
        watchFile: ts.WatchFileKind.UseFsEvents,
        watchDirectory: ts.WatchDirectoryKind.UseFsEvents,
        fallbackPolling: ts.PollingWatchKind.DynamicPriority,
      }
    });

    const pluginConfig: PluginConfig = {
      angularOnly: true,
    };
    if (options.host.isG3) {
      options.ivy = true;
      pluginConfig.forceStrictTemplates = true;
    }
    projSvc.configurePlugin({
      pluginName: options.ngPlugin,
      configuration: pluginConfig,
    });

    return projSvc;
  }