Suppression with `SuppressMessageAttribute` is completely broken for variables
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 45/100
Research direction
Start by running the PowerShell reproduction against PSScriptAnalyzer 1.23.0 and trace how SuppressMessageAttribute is handled for variables. Compare rule-name matching for NonexistentRule and PSAvoidGlobalVars; done means the nonexistent rule does not suppress PSUseDeclaredVarsMoreThanAssignments, while the valid rule suppresses PSAvoidGlobalVars.
Written by the indexing model from the issue text.
Description
Steps to reproduce
Consider this code:
$foo = "never used" # Should generate PSUseDeclaredVarsMoreThanAssignments
$global:var1 = $null # Should generate PSAvoidGlobalVars
Now let's try to add these suppressions:
[Diagnostics.CodeAnalysis.SuppressMessage('NonexistentRule', '')]
$foo = "never used" # Should still generate PSUseDeclaredVarsMoreThanAssignments
[Diagnostics.CodeAnalysis.SuppressMessage('PSAvoidGlobalVars', '')]
$global:var1 = $null # Should NOT generate PSAvoidGlobalVars
Expected behavior
I should still see the PSUseDeclaredVarsMoreThanAssignments warning, but not the PSAvoidGlobalVars one.
Actual behavior
The opposite happens, the first message is suppressed, but the second is not:
RuleName Severity ScriptName Line Message
-------- -------- ---------- ---- -------
PSAvoidGlobalVars Warning Test.ps1 5 Found global variable 'global:var1'.
Environment data
> $PSVersionTable
Name Value
---- -----
PSVersion 7.4.5
PSEdition Core
GitCommitId 7.4.5
OS Microsoft Windows 10.0.22631
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
- Dominant language
- C#
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- Merged PRs (30d)
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