intl: make DateTimeFormat/NumberFormat callable without new (ECMA-402 legacy behavior) - #117
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… legacy behavior)
Umami's isValidTimezone calls Intl.DateTimeFormat(undefined, {timeZone}) as a
plain function; the stub threw, rejecting every timezone.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
syrusakbary
approved these changes
Jul 15, 2026
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Split out of #112.
ECMA-402 requires
Intl.DateTimeFormat(...)andIntl.NumberFormat(...)to work when called as plain functions (legacy behavior equivalent tonew). The QuickJS provider's ICU-backed Intl only supported construction withnew; date-fns and other libraries callIntl.DateTimeFormat().resolvedOptions()without it.🤖 Generated with Claude Code