PowerShell / PowerShell/PSScriptAnalyzer

Proposal: Signal invalid syntax in switch statement condition

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Issue - Enhancement Issue - New Rule
Dominant language
C#
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Forks
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Avg merge
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Merged PRs (30d)
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Description

The switch statement condition syntax seems obscure from time to time. See PowerShell issues 21299 and 10911.

Hence, I suggest do add a few checks to test switch statement conditions for invalid syntax. (I.e., syntax that will never be evaluated, or that will always evaluate to $false etc.)

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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 reviewing the linked PowerShell issues and the repository's existing analyzer rules and tests to define which switch-condition forms are invalid. Clarify the intended checks and their expected diagnostics before implementing them, then add coverage showing that invalid conditions are reported while valid conditions remain unaffected.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp, powershell
Domain
tooling
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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