Method update

vscode-ng-language-service/server/src/utils.ts:158–163

(item: string)

  private readonly set = new Set<string>();

  update(item: string) {
    if (this.set.has(item)) {
      this.set.delete(item);
    }
    this.set.add(item);
  }

  delete(item: string) {
    this.set.delete(item);