Enable and fix many .NET Code Analysis warnings

.editorconfig

@@ -13,6 +13,33 @@ trim_trailing_whitespace = true
 csharp_space_before_open_square_brackets = true
 csharp_space_after_keywords_in_control_flow_statements = true
 
+# CS0168: The variable 'var' is declared but never used
+dotnet_diagnostic.CS0168.severity = error
+# CS0169: The private field 'class member' is never used
+dotnet_diagnostic.CS0169.severity = error
+# CS0219: The variable 'variable' is assigned but its value is never used
+dotnet_diagnostic.CS0219.severity = error
+# CS0414: The private field 'field' is assigned but its value is never used
+dotnet_diagnostic.CS0414.severity = error
+# CA1068: CancellationToken parameters must come last
+dotnet_diagnostic.CA1068.severity = error
+# CA1822: Mark members as static
+dotnet_diagnostic.CA1822.severity = error
+# CA1823: Avoid unused private fields
+dotnet_diagnostic.CA1823.severity = error
+# CA2007: Do not directly await a Task
+dotnet_diagnostic.CA2007.severity = error
+# CA2016: Forward the CancellationToken parameter to methods that take one
+dotnet_diagnostic.CA2016.severity = error
+# All maintainability issues (dead code etc.)
+# See: https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/maintainability-warnings
+dotnet_analyzer_diagnostic.category-Maintainability.severity = error
+# VSTHRD002: Synchronously waiting on tasks or awaiters may cause deadlocks
+# TODO: Fix all of these issues and explicitly ignore the intentional ones.
+dotnet_diagnostic.VSTHRD002.severity = silent
+# VSTHRD200: Use "Async" suffix for awaitable methods
+dotnet_diagnostic.VSTHRD200.severity = silent
+
 [*.{json}]
 indent_size = 2
 trim_trailing_whitespace = true

PowerShellEditorServices.Common.props

@@ -11,5 +11,8 @@
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/PowerShell/PowerShellEditorServices</RepositoryUrl>
     <DebugType>portable</DebugType>
+    <!-- See: https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/overview -->
+    <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    <!-- TODO: Enable `EnforceCodeStyleInBuild` -->
   </PropertyGroup>
 </Project>

src/PowerShellEditorServices.Hosting/EditorServicesLoader.cs

@@ -226,7 +226,7 @@ public void Dispose()
             // This is not high priority, since the PSES process shouldn't be reused
         }
 
-        private void LoadEditorServices()
+        private static void LoadEditorServices()
         {
             // This must be in its own method, since the actual load happens when the calling method is called
             // The call within this method is therefore a total no-op
@@ -317,7 +317,7 @@ private void LogHostInformation()
             LogOperatingSystemDetails();
         }
 
-        private string GetPSOutputEncoding()
+        private static string GetPSOutputEncoding()
         {
             using (var pwsh = SMA.PowerShell.Create())
             {
@@ -346,7 +346,7 @@ private void LogOperatingSystemDetails()
 ");
         }
 
-        private string GetOSArchitecture()
+        private static string GetOSArchitecture()
         {
 #if CoreCLR
             if (Environment.OSVersion.Platform != PlatformID.Win32NT)

src/PowerShellEditorServices.Hosting/PowerShellEditorServices.Hosting.csproj

@@ -31,10 +31,6 @@
 
   <ItemGroup>
     <ProjectReference Include="..\PowerShellEditorServices\PowerShellEditorServices.csproj" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.3.2">
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-    </PackageReference>
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='net461'">

src/PowerShellEditorServices.VSCode/CustomViews/CustomViewBase.cs

@@ -28,40 +28,31 @@ public CustomViewBase(
             this.languageServer = languageServer;
         }
 
-        internal async Task CreateAsync()
-        {
-            await languageServer.SendRequestAsync(
+        internal Task CreateAsync() =>
+            languageServer.SendRequestAsync(
                 NewCustomViewRequest.Method,
                 new NewCustomViewRequest
                 {
                     Id = this.Id,
                     Title = this.Title,
                     ViewType = this.ViewType,
-                }
-            );
-        }
+                });
 
-        public async Task Show(ViewColumn viewColumn)
-        {
-            await languageServer.SendRequestAsync(
+        public Task Show(ViewColumn viewColumn) =>
+            languageServer.SendRequestAsync(
                 ShowCustomViewRequest.Method,
                 new ShowCustomViewRequest
                 {
                     Id = this.Id,
                     ViewColumn = viewColumn
-                }
-            );
-        }
+                });
 
-        public async Task Close()
-        {
-            await languageServer.SendRequestAsync(
+        public Task Close() =>
+            languageServer.SendRequestAsync(
                 CloseCustomViewRequest.Method,
                 new CloseCustomViewRequest
                 {
                     Id = this.Id,
-                }
-            );
-        }
+                });
     }
 }

src/PowerShellEditorServices.VSCode/CustomViews/HtmlContentView.cs

@@ -21,51 +21,42 @@ public HtmlContentView(
         {
         }
 
-        public async Task SetContentAsync(string htmlBodyContent)
-        {
-            await languageServer.SendRequestAsync(
+        public Task SetContentAsync(string htmlBodyContent) =>
+            languageServer.SendRequestAsync(
                 SetHtmlContentViewRequest.Method,
                 new SetHtmlContentViewRequest
                 {
                     Id = this.Id,
                     HtmlContent = new HtmlContent { BodyContent = htmlBodyContent }
                 }
             );
-        }
-
-        public async Task SetContentAsync(HtmlContent htmlContent)
-        {
-            HtmlContent validatedContent =
-                new HtmlContent()
-                {
-                    BodyContent = htmlContent.BodyContent,
-                    JavaScriptPaths = this.GetUriPaths(htmlContent.JavaScriptPaths),
-                    StyleSheetPaths = this.GetUriPaths(htmlContent.StyleSheetPaths)
-                };
 
-            await languageServer.SendRequestAsync(
+        public Task SetContentAsync(HtmlContent htmlContent) =>
+            languageServer.SendRequestAsync(
                 SetHtmlContentViewRequest.Method,
                 new SetHtmlContentViewRequest
                 {
                     Id = this.Id,
-                    HtmlContent = validatedContent
+                    HtmlContent = new HtmlContent()
+                    {
+                        BodyContent = htmlContent.BodyContent,
+                        JavaScriptPaths = HtmlContentView.GetUriPaths(htmlContent.JavaScriptPaths),
+                        StyleSheetPaths = HtmlContentView.GetUriPaths(htmlContent.StyleSheetPaths)
+                    }
                 }
             );
-        }
 
-        public async Task AppendContentAsync(string appendedHtmlBodyContent)
-        {
-            await languageServer.SendRequestAsync(
+        public Task AppendContentAsync(string appendedHtmlBodyContent) =>
+            languageServer.SendRequestAsync(
                 AppendHtmlContentViewRequest.Method,
                 new AppendHtmlContentViewRequest
                 {
                     Id = this.Id,
                     AppendedHtmlBodyContent = appendedHtmlBodyContent
                 }
             );
-        }
 
-        private string[] GetUriPaths(string[] filePaths)
+        private static string[] GetUriPaths(string[] filePaths)
         {
             return
                 filePaths?

src/PowerShellEditorServices.VSCode/CustomViews/HtmlContentViewsFeature.cs

@@ -21,7 +21,7 @@ public async Task<IHtmlContentView> CreateHtmlContentViewAsync(string viewTitle)
                     viewTitle,
                     languageServer);
 
-            await htmlView.CreateAsync();
+            await htmlView.CreateAsync().ConfigureAwait(false);
             this.AddView(htmlView);
 
             return htmlView;

src/PowerShellEditorServices/Extensions/Api/EditorExtensionServiceProvider.cs

@@ -156,7 +156,7 @@ public object GetService(Type serviceType)
         /// In .NET Framework, this returns null.
         /// </summary>
         /// <returns>The assembly load context used for loading PSES, or null in .NET Framework.</returns>
-        public object GetPsesAssemblyLoadContext()
+        public static object GetPsesAssemblyLoadContext()
         {
             if (!VersionUtils.IsNetCore)
             {
@@ -172,7 +172,7 @@ public object GetPsesAssemblyLoadContext()
         /// </summary>
         /// <param name="assemblyPath">The absolute path of the assembly to load.</param>
         /// <returns>The loaded assembly object.</returns>
-        public Assembly LoadAssemblyInPsesLoadContext(string assemblyPath)
+        public static Assembly LoadAssemblyInPsesLoadContext(string assemblyPath)
         {
             if (!VersionUtils.IsNetCore)
             {

src/PowerShellEditorServices/Extensions/Api/EditorUIService.cs

@@ -116,7 +116,7 @@ public async Task<string> PromptInputAsync(string message)
                 new ShowInputPromptRequest
                 {
                     Name = message,
-                }).Returning<ShowInputPromptResponse>(CancellationToken.None);
+                }).Returning<ShowInputPromptResponse>(CancellationToken.None).ConfigureAwait(false);
 
             if (response.PromptCancelled)
             {
@@ -142,7 +142,7 @@ public async Task<IReadOnlyList<string>> PromptMultipleSelectionAsync(string mes
                     Message = message,
                     Choices = choiceDetails,
                     DefaultChoices = defaultChoiceIndexes?.ToArray(),
-                }).Returning<ShowChoicePromptResponse>(CancellationToken.None);
+                }).Returning<ShowChoicePromptResponse>(CancellationToken.None).ConfigureAwait(false);
 
             if (response.PromptCancelled)
             {
@@ -168,7 +168,7 @@ public async Task<string> PromptSelectionAsync(string message, IReadOnlyList<Pro
                     Message = message,
                     Choices = choiceDetails,
                     DefaultChoices = defaultChoiceIndex > -1 ? new[] { defaultChoiceIndex } : null,
-                }).Returning<ShowChoicePromptResponse>(CancellationToken.None);
+                }).Returning<ShowChoicePromptResponse>(CancellationToken.None).ConfigureAwait(false);
 
             if (response.PromptCancelled)
             {

src/PowerShellEditorServices/Extensions/Api/WorkspaceService.cs

@@ -147,7 +147,7 @@ public IReadOnlyList<IEditorScriptFile> GetOpenedFiles()
             return files.AsReadOnly();
         }
 
-        private IEditorScriptFile GetEditorFileFromScriptFile(ScriptFile file)
+        private static IEditorScriptFile GetEditorFileFromScriptFile(ScriptFile file)
         {
             return new EditorScriptFile(file);
         }

src/PowerShellEditorServices/PowerShellEditorServices.csproj

@@ -1,5 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), PowerShellEditorServices.Common.props))\PowerShellEditorServices.Common.props" />
 
   <PropertyGroup>

src/PowerShellEditorServices/Services/Analysis/PssaCmdletAnalysisEngine.cs

@@ -362,7 +362,7 @@ private PowerShellResult InvokePowerShell(PSCommand command)
         /// </summary>
         /// <param name="powershell">The PowerShell instance to execute.</param>
         /// <returns>The output of PowerShell execution.</returns>
-        private Collection<PSObject> InvokePowerShellWithModulePathPreservation(System.Management.Automation.PowerShell powershell)
+        private static Collection<PSObject> InvokePowerShellWithModulePathPreservation(System.Management.Automation.PowerShell powershell)
         {
             using (PSModulePathPreserver.Take())
             {

src/PowerShellEditorServices/Services/CodeLens/PesterCodeLensProvider.cs

@@ -42,7 +42,7 @@ public PesterCodeLensProvider(ConfigurationService configurationService)
         /// <param name="pesterSymbol">The Pester symbol to get CodeLenses for.</param>
         /// <param name="scriptFile">The script file the Pester symbol comes from.</param>
         /// <returns>All CodeLenses for the given Pester symbol.</returns>
-        private CodeLens[] GetPesterLens(PesterSymbolReference pesterSymbol, ScriptFile scriptFile)
+        private static CodeLens[] GetPesterLens(PesterSymbolReference pesterSymbol, ScriptFile scriptFile)
         {
             string word = pesterSymbol.Command == PesterCommandType.It ? "test" : "tests";
             var codeLensResults = new CodeLens[]

src/PowerShellEditorServices/Services/CodeLens/ReferencesCodeLensProvider.cs

@@ -86,7 +86,7 @@ public CodeLens ResolveCodeLens(CodeLens codeLens, ScriptFile scriptFile)
             ScriptFile[] references = _workspaceService.ExpandScriptReferences(
                 scriptFile);
 
-            SymbolReference foundSymbol = _symbolsService.FindFunctionDefinitionAtLocation(
+            SymbolReference foundSymbol = SymbolsService.FindFunctionDefinitionAtLocation(
                 scriptFile,
                 codeLens.Range.Start.Line + 1,
                 codeLens.Range.Start.Character + 1);

src/PowerShellEditorServices/Services/DebugAdapter/BreakpointService.cs

@@ -47,7 +47,7 @@ public async Task<List<Breakpoint>> GetBreakpointsAsync()
             // Legacy behavior
             PSCommand psCommand = new PSCommand();
             psCommand.AddCommand(@"Microsoft.PowerShell.Utility\Get-PSBreakpoint");
-            IEnumerable<Breakpoint> breakpoints = await _powerShellContextService.ExecuteCommandAsync<Breakpoint>(psCommand);
+            IEnumerable<Breakpoint> breakpoints = await _powerShellContextService.ExecuteCommandAsync<Breakpoint>(psCommand).ConfigureAwait(false);
             return breakpoints.ToList();
         }
 
@@ -133,7 +133,7 @@ public async Task<IEnumerable<BreakpointDetails>> SetBreakpointsAsync(string esc
             if (psCommand != null)
             {
                 IEnumerable<Breakpoint> setBreakpoints =
-                    await _powerShellContextService.ExecuteCommandAsync<Breakpoint>(psCommand);
+                    await _powerShellContextService.ExecuteCommandAsync<Breakpoint>(psCommand).ConfigureAwait(false);
                 configuredBreakpoints.AddRange(
                     setBreakpoints.Select(BreakpointDetails.Create));
             }
@@ -210,7 +210,7 @@ public async Task<IEnumerable<CommandBreakpointDetails>> SetCommandBreakpoints(I
             if (psCommand != null)
             {
                 IEnumerable<Breakpoint> setBreakpoints =
-                    await _powerShellContextService.ExecuteCommandAsync<Breakpoint>(psCommand);
+                    await _powerShellContextService.ExecuteCommandAsync<Breakpoint>(psCommand).ConfigureAwait(false);
                 configuredBreakpoints.AddRange(
                     setBreakpoints.Select(CommandBreakpointDetails.Create));
             }
@@ -301,7 +301,7 @@ public async Task RemoveBreakpointsAsync(IEnumerable<Breakpoint> breakpoints)
                 psCommand.AddCommand(@"Microsoft.PowerShell.Utility\Remove-PSBreakpoint");
                 psCommand.AddParameter("Id", breakpoints.Select(b => b.Id).ToArray());
 
-                await _powerShellContextService.ExecuteCommandAsync<object>(psCommand);
+                await _powerShellContextService.ExecuteCommandAsync<object>(psCommand).ConfigureAwait(false);
             }
         }
 

src/PowerShellEditorServices/Services/DebugAdapter/DebugService.cs

@@ -43,8 +43,6 @@ internal class DebugService
         private StackFrameDetails[] stackFrameDetails;
         private readonly PropertyInfo invocationTypeScriptPositionProperty;
 
-        private static int breakpointHitCounter;
-
         private readonly SemaphoreSlim debugInfoHandle = AsyncUtils.CreateSimpleLockingSemaphore();
         #endregion
 
@@ -190,7 +188,7 @@ public async Task<BreakpointDetails[]> SetLineBreakpointsAsync(
             return await dscBreakpoints.SetLineBreakpointsAsync(
                 this.powerShellContext,
                 escapedScriptPath,
-                breakpoints);
+                breakpoints).ConfigureAwait(false);
         }
 
         /// <summary>
@@ -208,7 +206,9 @@ public async Task<CommandBreakpointDetails[]> SetCommandBreakpointsAsync(
             if (clearExisting)
             {
                 // Flatten dictionary values into one list and remove them all.
-                await _breakpointService.RemoveBreakpointsAsync((await _breakpointService.GetBreakpointsAsync()).Where( i => i is CommandBreakpoint)).ConfigureAwait(false);
+                await _breakpointService.RemoveBreakpointsAsync(
+                    (await _breakpointService.GetBreakpointsAsync().ConfigureAwait(false))
+                    .Where( i => i is CommandBreakpoint)).ConfigureAwait(false);
             }
 
             if (breakpoints.Length > 0)
@@ -854,7 +854,7 @@ private async Task FetchStackFramesAsync(string scriptNameOverride)
             }
         }
 
-        private string TrimScriptListingLine(PSObject scriptLineObj, ref int prefixLength)
+        private static string TrimScriptListingLine(PSObject scriptLineObj, ref int prefixLength)
         {
             string scriptLine = scriptLineObj.ToString();
 
@@ -906,7 +906,7 @@ await this.powerShellContext.ExecuteCommandAsync<PSObject>(
                         string.Join(
                             Environment.NewLine,
                             scriptListingLines
-                                .Select(o => this.TrimScriptListingLine(o, ref linePrefixLength))
+                                .Select(o => DebugService.TrimScriptListingLine(o, ref linePrefixLength))
                                 .Where(s => s != null));
 
                     this.temporaryScriptListingPath =

src/PowerShellEditorServices/Services/DebugAdapter/Handlers/DisconnectHandler.cs

@@ -75,7 +75,7 @@ public async Task<DisconnectResponse> Handle(DisconnectArguments request, Cancel
 
 #pragma warning disable CS4014
             // Trigger the clean up of the debugger. No need to wait for it.
-            Task.Run(_psesDebugServer.OnSessionEnded);
+            Task.Run(_psesDebugServer.OnSessionEnded, cancellationToken);
 #pragma warning restore CS4014
 
             return new DisconnectResponse();