Found this while writing the docs for the Backstage Coder SDK:

exporttypeDeleteWorkspaceOptions=Pick<TypesGen.CreateWorkspaceBuildRequest,"log_level"&"orphan">;

It's literally a single character difference, but the secondPick argument should be:

"log_level"|"orphan"

Changes made

• Changed the& to a|
• Updated one of the calls to the deletion method to fix a typo that was being allowed because of the incorrect type
• Updated one the test files to use the correct property format

Explanation

With the&, you have an intersection instead of a union. Basically, that says "give me a type that is both the literal"log_level" and the literal"orphan" at the same time". It's impossible for a value to be two different things at the exact same time, so the resulting type isnever. When you picknever from an object, you pick nothing, so the ultimate resulting type is the type{} (which is equivalent toNonullable<unknown>).Nonullable<unknown> isn't much better than anany type – it's basicallyany, but withnull andundefined removed