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fix(ui): keep truncateWithEndVisible code-point-safe in short-width fallback - #9029
fix(ui): keep truncateWithEndVisible code-point-safe in short-width fallback#9029mahirhir wants to merge 1 commit into
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🦋 Changeset detectedLatest commit: 017122d The changes in this PR will be included in the next version bump. This PR includes changesets to release 3 packages
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📝 WalkthroughWalkthrough
Surrogate-safe truncation fix
Estimated code review effort🎯 1 (Trivial) | ⏱️ ~3 minutes Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@packages/ui/src/utils/truncateTextWithEndVisible.ts`:
- Line 23: The fallback in truncateTextWithEndVisible is running before the
code-point-aware fit check, so astral-only strings that already fit still get
truncated. Move the Array.from(str).slice(-endChars) / ELLIPSIS fallback to
execute only after the totalChars <= maxLength guard (or equivalent
code-point-length check) in truncateWithEndVisible, and update the related tests
so they either expect the original string when it fits or use a smaller
maxLength to cover the truncation path.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (3)
.changeset/truncate-surrogate-safe.mdpackages/ui/src/utils/__tests__/truncateTextWithEndVisible.test.tspackages/ui/src/utils/truncateTextWithEndVisible.ts
| if (maxLength <= endChars + ELLIPSIS_LENGTH) { | ||
| return ELLIPSIS + str.slice(-endChars); | ||
| return ELLIPSIS + Array.from(str).slice(-endChars).join(''); |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
Hoist the code-point length check before this fallback.
Line 23 still runs before the code-point-aware totalChars <= maxLength guard, so astral-only strings that already fit are still truncated. For example, truncateWithEndVisible('🍣🍣🍣🍣🍣', 8, 5) now returns '...🍣🍣🍣🍣🍣' because Line 18 compares UTF-16 length. That also makes the new assertions at Lines 35-36 validate the wrong behavior; once this is fixed, they should either expect the original string or use a smaller maxLength to exercise the fallback.
Suggested fix
export function truncateWithEndVisible(str: string, maxLength = 20, endChars = 5): string {
const ELLIPSIS = '...';
const ELLIPSIS_LENGTH = ELLIPSIS.length;
- if (!str || str.length <= maxLength) {+ if (!str) {
return str;
}
++ const chars = Array.from(str);+ const totalChars = chars.length;++ if (totalChars <= maxLength) {+ return str;+ }
if (maxLength <= endChars + ELLIPSIS_LENGTH) {
- return ELLIPSIS + Array.from(str).slice(-endChars).join('');+ return ELLIPSIS + chars.slice(-endChars).join('');
}
-- const chars = Array.from(str);- const totalChars = chars.length;-- if (totalChars <= maxLength) {- return str;- }📝 Committable suggestion
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| returnELLIPSIS+Array.from(str).slice(-endChars).join(''); | |
| exportfunctiontruncateWithEndVisible(str: string,maxLength=20,endChars=5): string{ | |
| constELLIPSIS='...'; | |
| constELLIPSIS_LENGTH=ELLIPSIS.length; | |
| if(!str){ | |
| returnstr; | |
| } | |
| constchars=Array.from(str); | |
| consttotalChars=chars.length; | |
| if(totalChars<=maxLength){ | |
| returnstr; | |
| } | |
| if(maxLength<=endChars+ELLIPSIS_LENGTH){ | |
| returnELLIPSIS+chars.slice(-endChars).join(''); | |
| } |
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@packages/ui/src/utils/truncateTextWithEndVisible.ts` at line 23, The fallback
in truncateTextWithEndVisible is running before the code-point-aware fit check,
so astral-only strings that already fit still get truncated. Move the
Array.from(str).slice(-endChars) / ELLIPSIS fallback to execute only after the
totalChars <= maxLength guard (or equivalent code-point-length check) in
truncateWithEndVisible, and update the related tests so they either expect the
original string when it fits or use a smaller maxLength to cover the truncation
path.
alexcarpenter
commented
Jun 30, 2026
closing in favor of #9047 thanks for the PR @greymoth-jp |
truncateWithEndVisiblekeeps the start and end of a string and puts an ellipsis in the middle. The main path builds the result fromArray.from(str), so it slices on code points and never breaks a character. The short-width fallback (taken whenmaxLength <= endChars + 3) instead returnsELLIPSIS + str.slice(-endChars), which slices on UTF-16 code units.For characters outside the BMP (CJK Extension B kanji, emoji) each character is a surrogate pair of two code units, so
str.slice(-endChars)can cut one in half and leave a lone surrogate:The fallback now slices by code point, the same way the main path already does. ASCII inputs are unaffected and the existing tests still pass. Added a test covering the fallback with astral characters.
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