Warn on lowercase method name during script analyze

.vscode/CustomRules/UseCorrectMethodCasing.psm1

@@ -0,0 +1,67 @@
+<#
+.SYNOPSIS
+    Use correct method casing in the method name.
+.DESCRIPTION
+    Methods called on an object should use the correct casing (PascalCase) for the method name.
+.EXAMPLE
+    $MyInvocation.MyCommand.ModuleName.Replace('MSFT_', '')
+    $MyInvocation.MyCommand.ModuleName.replace('MSFT_', '')
+    The first example is correct, the second example is incorrect.
+#>
+
+function Use-CorrectMethodCasing {
+    [CmdletBinding()]
+    [OutputType([Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic.DiagnosticRecord[]])]
+    param (
+        [Parameter(Mandatory = $true)]
+        [ValidateNotNullOrEmpty()]
+        [System.Management.Automation.Language.ScriptBlockAst]
+        $ScriptBlockAst
+    )
+
+    Process
+    {
+        $results = @()
+        try
+        {
+            [System.Management.Automation.Language.InvokeMemberExpressionAst[]]$memberAst = $ScriptBlockAst.FindAll({$Args[0].GetType().Name -eq 'InvokeMemberExpressionAst'}, $true)
+
+            foreach ($member in $memberAst)
+            {
+                if ($member.Member.Value -cmatch '^[a-z]') {
+                    [int]$startLineNumber =  $member.Extent.StartLineNumber
+                    [int]$endLineNumber = $member.Extent.EndLineNumber
+                    [int]$startColumnNumber = $member.Extent.StartColumnNumber
+                    [int]$endColumnNumber = $member.Extent.EndColumnNumber
+                    [string]$file = $MyInvocation.MyCommand.Definition
+
+                    $correctedString = $member.Member.Value.Substring(0, 1).ToUpper() + $member.Member.Value.Substring(1)
+                    [string]$correction = $member.Extent.Text.Replace($member.Member.Value, $correctedString)
+                    [string]$optionalDescription = "Replace '$($member.Member.Value)' with '$($member.Member.Value.Substring(0, 1).ToUpper() + $member.Member.Value.Substring(1))'."
+                    $objParams = @{
+                        TypeName = 'Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic.CorrectionExtent'
+                        ArgumentList = $startLineNumber, $endLineNumber, $startColumnNumber,
+                                       $endColumnNumber, $correction, $file, $optionalDescription
+                    }
+                    $correctionExtent = New-Object @objParams
+                    $suggestedCorrections = New-Object System.Collections.ObjectModel.Collection[$($objParams.TypeName)]
+                    $suggestedCorrections.Add($correctionExtent) | Out-Null
+
+                    $results += [Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic.DiagnosticRecord]@{
+                        Message = 'Use correct method casing in the method name.'
+                        Extent = $member.Extent
+                        RuleName = $PSCmdlet.MyInvocation.InvocationName
+                        Severity = 'Warning'
+                        SuggestedCorrections = $suggestedCorrections
+                    }
+                }
+            }
+        }
+        catch
+        {
+            $PSCmdlet.ThrowTerminatingError( $_ )
+        }
+
+        return $results
+    }
+}

.vscode/ScriptAnalyzerSettings.psd1

@@ -1,8 +1,16 @@
 @{
-    Severity     = @('Error',
-        'Warning')
-    ExcludeRules = @('PSMissingModuleManifestField',
+    Severity = @(
+        'Error',
+        'Warning'
+    )
+    ExcludeRules = @(
+        'PSMissingModuleManifestField',
         'PSUseShouldProcessForStateChangingFunctions',
         'PSAvoidGlobalVars',
-        'PSAvoidUsingWriteHost')
+        'PSAvoidUsingWriteHost'
+    )
+    CustomRulePath = @(
+        '.vscode\CustomRules\UseCorrectMethodCasing.psm1'
+    )
+    IncludeDefaultRules = $true
 }