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powershell/PSUseLiteralInitializerForHashtable is a PSScriptAnalyzer diagnostic emitted by tally for PowerShell snippets embedded in Dockerfiles.
PropertyValue
SeverityWarning
CategoryPSScriptAnalyzer
Auto-fixNo

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Description

Creating a hashtable using [hashtable]::new() or New-Object -TypeName hashtable without passing a IEqualityComparer object to the constructor creates a hashtable where the keys are looked-up in a case-sensitive manner. However, PowerShell is case-insensitive in nature and it is best to create hashtables with case-insensitive key look-up. This rule is intended to warn the author of the case-sensitive nature of the hashtable when created using the new method or the New-Object cmdlet.

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How to Fix

Create the hashtable using a literal hashtable expression.

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Examples

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Problematic code ([hashtable]::new())

$hashtable = [hashtable]::new()

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Problematic code (New-Object)

$hashtable = New-Object -TypeName hashtable

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Correct code

$hashtable = @{}

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Source

This rule documentation is adapted from Microsoft’s PSScriptAnalyzer documentation for UseLiteralInitializerForHashtable, licensed under CC BY 4.0.