Some graphemes (e.g. country flags) break the truncation invariant
Considering cli-truncate works with terminal char widths, I think this expectation is valid:
expect(cliTruncate('🇪🇺!', 2)).toEqual('…')
However due to country flags consisting of multiple code points treated as separate chars in slice-ansi, cliTruncate returns "🇪…"
This is not only rendering artifact but a broken invariant, e.g. string-width stringWidth("🇪…") returns 3 that is above requested width 2.
using Intl.Segmenter in slice-ansi can be possible way to fix it: chalk/slice-ansi#35
Got here debugging ink truncation issue when line had country flag on box wrap edge)
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