Assignment of invalid values to local action preference variables

[nightroman]

Not global action preference variables are not strongly typed. As a result,
anything can be assigned to them, not necessarily valid values. For example,
typos will not be reported as errors, unlike with global variables.

In other words, PSSA should report issues like this, mind the typo:

$VerbosePreference = 'Cotninue'

References:

• Microsoft Connect 692892
• Local-ActionPreference.

[nightroman]

And it's not just about typos. Ingore is valid in v3+ but invalid in v2, Suspend is valid in v4+ and invalid in v3-.

Properly designed code takes care of such things, e.g. in Pester:

if ($PSVersionTable.PSVersion.Major -ge 3)
{
    $script:IgnoreErrorPreference = 'Ignore'
}
else
{
    $script:IgnoreErrorPreference = 'SilentlyContinue'
}