Revert previous assertion as it introduced a regression#2102
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It seems reasonable to assert that keys shouldn't be undefined, since keys are supposed to be of type PropertyKey (string | number | symbol). But in practice, JavaScript allows undefined as a key by implicitly converting it to the string "undefined". This caused a regression specifically in the `groupBy` function, where the grouper callback can return undefined for some items. That behavior was previously supported and is now broken by the assertion. Long-term, it probably makes sense to tighten this up and only allow real PropertyKeys, but that’ll need a more careful cleanup.
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Output diff failing test is under control as we change a TS file that does change the builded output. |
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Superseed #2100
Revert a change introduced in Commit 53237d2.
Previously, grouping by a function that might return
undefinedwas tolerated, but in the latest version, this now throws.This PR does add @giggo1604 changes, but improve the TS typing directly