Use 'never' type for empty array literals #8907
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This PR introduces a widening form of the
never
type that we use for empty array literals in--strictNullChecks
mode. This fixes the following issue reported in #8878:Before this fix the inferred type above was
(string | undefined)[]
because we were using typeundefined[]
for empty array literals, andundefined
isn't a bottom type in strict null checking mode.