PSScriptAnalyser misreporting

Issue Type: Bug

If statements comparing with $null aren't evaluated properly

if($Credential.UserName -ne $null) labelled as null on wrong side of operator

Several instances of "trailing whitespace' yet none exists

Extension version: 1.8.1
VS Code version: Code 1.25.0 (0f080e5267e829de46638128001aeb7ca2d6d50e, 2018-07-05T13:11:11.248Z)
OS version: Windows_NT ia32 10.0.14393

System Info

Item	Value
CPUs	Intel(R) Xeon(R) CPU E5-2643 0 @ 3.30GHz (2 x 3292)
GPU Status	2d_canvas: unavailable_software flash_3d: unavailable_software flash_stage3d: unavailable_software flash_stage3d_baseline: unavailable_software gpu_compositing: unavailable_software multiple_raster_threads: disabled_off native_gpu_memory_buffers: disabled_software rasterization: unavailable_software video_decode: unavailable_software video_encode: unavailable_software vpx_decode: unavailable_software webgl: unavailable_off webgl2: unavailable_off
Memory (System)	4.00GB (1.23GB free)
Process Argv	C:\Program Files (x86)\Microsoft VS Code\Code.exe D:\github\At-A-Glance
Screen Reader	no
VM	0%

[rkeithhill]

I believe the "trailing whitespace" issue is a problem PSSA needs to fix. The $null warnings are probably correct - see https://github.com/PowerShell/PSScriptAnalyzer/blob/development/RuleDocumentation/PossibleIncorrectComparisonWithNull.md

However, you can exclude both of these rules by adding a PSScriptAnalyzerSettings.psd1 file to your workspace. Then add a workspace settings file to ${workspaceRoot}/.vscode/workspace.json with this file content (setting):

{
    // Use a custom PowerShell Script Analyzer settings file for this workspace.
    // Relative paths for this setting are always relative to the workspace root dir.
    "powershell.scriptAnalysis.settingsPath": "./PSScriptAnalyzerSettings.psd1"
}

Then in the PSScriptAnalyzerSettings.psd1 file, add this content:

# Use the PowerShell extension setting `powershell.scriptAnalysis.settingsPath` to get the current workspace
# to use this PSScriptAnalyzerSettings.psd1 file to configure code analysis in Visual Studio Code.
# This setting is configured in the workspace's `.vscode\settings.json`.
#
# For more information on PSScriptAnalyzer settings see:
# https://github.com/PowerShell/PSScriptAnalyzer/blob/master/README.md#settings-support-in-scriptanalyzer
#
# You can see the predefined PSScriptAnalyzer settings here:
# https://github.com/PowerShell/PSScriptAnalyzer/tree/master/Engine/Settings
@{
    # Only diagnostic records of the specified severity will be generated.
    # Uncomment the following line if you only want Errors and Warnings but
    # not Information diagnostic records.
    #Severity = @('Error','Warning')

    # Analyze **only** the following rules. Use IncludeRules when you want
    # to invoke only a small subset of the default rules.
    #IncludeRules = @('PSAvoidDefaultValueSwitchParameter',
    #                 'PSMisleadingBacktick',
    #                 'PSMissingModuleManifestField',
    #                 'PSReservedCmdletChar',
    #                 'PSReservedParams',
    #                 'PSShouldProcess',
    #                 'PSUseApprovedVerbs',
    #                 'PSAvoidUsingCmdletAliases',
    #                 'PSUseDeclaredVarsMoreThanAssignments')

    # Do not analyze the following rules. Use ExcludeRules when you have
    # commented out the IncludeRules settings above and want to include all
    # the default rules except for those you exclude below.
    # Note: if a rule is in both IncludeRules and ExcludeRules, the rule
    # will be excluded.
    ExcludeRules = @('PSAvoidTrailingWhitespace', 'PSPossibleIncorrectComparisonWithNull', )

    # You can use rule configuration to configure rules that support it:
    #Rules = @{
    #    PSAvoidUsingCmdletAliases = @{
    #        Whitelist = @("cd")
    #    }
    #}
}

In general, PSSA the default rules are going to rub some set of folks the wrong way. That's why I recommend folks use this settings file to configure PSSA with the rules they find valuable.

[rjmholt]

For any issues with PSScriptAnalyzer, you should report them here

[rjmholt]

Going to close this issue in favour of #1429.