fix(groupBy): Use more accurate return type #1472
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Summary
Updates the return type of
groupByto reflect that properties need not exist in the output but that if they do, their value has at least length 1. It prevents users from having to suppress unnecessary condition warnings when trying to safely access properties ingroupByresults.Changes
groupByreturn type withPartialgroupByreturn type fromT[]to[T, ...T[]]Comments
The compat function is still using
Recordtype here instead ofPartial<Record>