PowerShell / PowerShell/PSScriptAnalyzer

Unable to run rules with hashtable that run fine with settings file

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Description

Steps to reproduce

This is essentially the opposite of #1160

The attached zip file concisely contains the repro:

PSScriptAnalyzerSettingsHashtableRepro.zip

But here it is in plain text too

# repro.ps1

Write-Output "Using settings file"

Invoke-ScriptAnalyzer -Path .\repro.ps1 -Settings '.\PSScriptAnalyzerSettings.psd1'

# Create an unused variable which triggers a warning that the settings file should suppress
$unusedVariable = 1

$settings = Import-PowerShellDataFile -Path '.\PSScriptAnalyzerSettings.psd1'

Write-Output "Loaded settings to hashtable:"

$settings | ConvertTo-Json | Write-Output

Write-Output "Using setting hashtable"

Invoke-ScriptAnalyzer -Path .\repro.ps1 -Settings $settings
# PSScriptAnalyzerSettings.psd1

@{
    ExcludeRules = @(
        'PSUseDeclaredVarsMoreThanAssignments'
    )
}

Expected behavior

The warning should be suppressed in both calls to Invoke-ScriptAnalyzer. Output from the repro script should be this:

Using settings file
Loaded settings to hashtable:
{
    "ExcludeRules":  [
                         "PSUseDeclaredVarsMoreThanAssignments"
                     ]
}
Using setting hashtable

Actual behavior

The warning is only suppressed in the first call (the one that references the file directly). The call that passes the settings hashtable does not suppress the error. Output from the repro script is this:

Using settings file
Loaded settings to hashtable:
{
  "ExcludeRules": [
    "PSUseDeclaredVarsMoreThanAssignments"
  ]
}
Using setting hashtable

RuleName                            Severity     ScriptName Line  Message
--------                            --------     ---------- ----  -------
PSUseDeclaredVarsMoreThanAssignment Warning      repro.ps1  6     The variable 'unusedVariable' is assigned but never
s                                                                 used.

Environment data

> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.4.6
PSEdition                      Core
GitCommitId                    7.4.6
OS                             Microsoft Windows 10.0.26100
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

> (Get-Module -ListAvailable PSScriptAnalyzer).Version | ForEach-Object { $_.ToString() }
1.23.0

Note that this issue does NOT happen in this environment (i.e. the warning is suppressed in both calls):

> $PSVersionTable
Name                           Value
----                           -----
PSVersion                      5.1.26100.2161
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.26100.2161
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

> (Get-Module -ListAvailable PSScriptAnalyzer).
Version | ForEach-Object { $_.ToString() }
1.23.0

It appears to be related to the Powershell version.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by running repro.ps1 with PSScriptAnalyzerSettings.psd1 under the reported PowerShell 7.4.6 and 5.1 environments, then trace how Invoke-ScriptAnalyzer handles the file path versus the imported settings hashtable. Done means the ExcludeRules entry suppresses PSUseDeclaredVarsMoreThanAssignments in both calls, with regression coverage for the differing PowerShell behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
powershell
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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