private static async Task <RestoreResultPair> PreviewAddPackageReference(PackageReferenceArgs packageReferenceArgs,
                                                                                 DependencyGraphSpec dgSpec,
                                                                                 PackageSpec originalPackageSpec)
        {
            // Set user agent and connection settings.
            XPlatUtility.ConfigureProtocol();

            var providerCache = new RestoreCommandProvidersCache();

            using (var cacheContext = new SourceCacheContext())
            {
                cacheContext.NoCache             = false;
                cacheContext.IgnoreFailedSources = false;

                // Pre-loaded request provider containing the graph file
                var providers = new List <IPreLoadedRestoreRequestProvider>();

                // Create a copy to avoid modifying the original spec which may be shared.
                var updatedPackageSpec = originalPackageSpec.Clone();

                PackageSpecOperations.AddOrUpdateDependency(updatedPackageSpec, packageReferenceArgs.PackageDependency);

                providers.Add(new DependencyGraphSpecRequestProvider(providerCache, dgSpec));

                var restoreContext = new RestoreArgs()
                {
                    CacheContext              = cacheContext,
                    LockFileVersion           = LockFileFormat.Version,
                    Log                       = packageReferenceArgs.Logger,
                    MachineWideSettings       = new XPlatMachineWideSetting(),
                    GlobalPackagesFolder      = packageReferenceArgs.PackageDirectory,
                    PreLoadedRequestProviders = providers,
                    Sources                   = packageReferenceArgs.Sources?.ToList()
                };

                // Generate Restore Requests. There will always be 1 request here since we are restoring for 1 project.
                var restoreRequests = await RestoreRunner.GetRequests(restoreContext);

                // Run restore without commit. This will always return 1 Result pair since we are restoring for 1 request.
                var restoreResult = await RestoreRunner.RunWithoutCommit(restoreRequests, restoreContext);

                return(restoreResult.Single());
            }
        }
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        private static async Task <RestoreResultPair> PreviewAddPackageReferenceAsync(PackageReferenceArgs packageReferenceArgs,
                                                                                      DependencyGraphSpec dgSpec)
        {
            // Set user agent and connection settings.
            XPlatUtility.ConfigureProtocol();

            var providerCache = new RestoreCommandProvidersCache();

            using (var cacheContext = new SourceCacheContext())
            {
                cacheContext.NoCache             = false;
                cacheContext.IgnoreFailedSources = false;

                // Pre-loaded request provider containing the graph file
                var providers = new List <IPreLoadedRestoreRequestProvider>
                {
                    new DependencyGraphSpecRequestProvider(providerCache, dgSpec)
                };

                var restoreContext = new RestoreArgs()
                {
                    CacheContext              = cacheContext,
                    LockFileVersion           = LockFileFormat.Version,
                    Log                       = packageReferenceArgs.Logger,
                    MachineWideSettings       = new XPlatMachineWideSetting(),
                    GlobalPackagesFolder      = packageReferenceArgs.PackageDirectory,
                    PreLoadedRequestProviders = providers,
                    Sources                   = packageReferenceArgs.Sources?.ToList()
                };

                // Generate Restore Requests. There will always be 1 request here since we are restoring for 1 project.
                var restoreRequests = await RestoreRunner.GetRequests(restoreContext);

                //Setup the Credential Service
                DefaultCredentialServiceUtility.SetupDefaultCredentialService(restoreContext.Log, !packageReferenceArgs.Interactive);

                // Run restore without commit. This will always return 1 Result pair since we are restoring for 1 request.
                var restoreResult = await RestoreRunner.RunWithoutCommit(restoreRequests, restoreContext);

                return(restoreResult.Single());
            }
        }