# pretext changelog

> Fast, accurate and comprehensive text measurement and layout.

- Vendor: chenglou
- Category: Frameworks & Libraries
- Official site: http://chenglou.me/pretext/
- Tracked by: What's New (https://whatsnew.fyi/product/pretext)
- Harvested from: Blog (https://github.com/chenglou/pretext/tags.atom)
- Entries below: 5 (newest first)

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

## Releases

### v0.0.8 — v0.0.8: Release 0.0.8

- Date: 2026-06-12
- Version: v0.0.8
- Original notes: https://github.com/chenglou/pretext/releases/tag/v0.0.8
- Permalink: https://whatsnew.fyi/product/pretext/releases/v0.0.8

Release 0.0.8 Co-Authored-By: Claude Fable 5

- **added** — The published package now ships declaration maps, so editor go-to-definition and programmatic TypeScript source tracing land in the shipped .ts source instead of the .d.ts files
- **fixed** — Word-internal keyboard and Unicode symbol runs in long words now stay with surrounding text the way browsers break them, while browser-break symbols stay breakable
- **fixed** — Overlong hyphenated runs now prefer browser-like dash breakpoints before falling back to emergency grapheme breaks

###### Added

- The published package now ships declaration maps, so editor go-to-definition and programmatic TypeScript source tracing land in the shipped `.ts` source instead of the `.d.ts` files.

###### Fixed

- Word-internal keyboard and Unicode symbol runs in long words now stay with surrounding text the way browsers break them, while browser-break symbols stay breakable (#169).
- Overlong hyphenated runs now prefer browser-like dash breakpoints before falling back to emergency grapheme breaks (#89).

### v0.0.7

- Date: 2026-05-10
- Version: v0.0.7
- Original notes: https://github.com/chenglou/pretext/releases/tag/v0.0.7
- Permalink: https://whatsnew.fyi/product/pretext/releases/v0.0.7

- **changed** — The package now declares itself side-effect-free so bundlers can tree-shake unused entrypoints
- **changed** — layoutNextLine() and layoutNextLineRange() now avoid redundant chunk lookup in chunk-heavy manual layout paths
- **fixed** — { wordBreak: 'keep-all' } now handles no-space mixed Latin, numeric, and CJK text more like browsers
- **fixed** — No-space punctuation chains now stay together for non-ASCII word-like text too, instead of only ASCII words
- **fixed** — Opening punctuation such as ¡, ¿, German low quotes, and ⸘ now stays with the following word instead of dangling at line end
- **fixed** — Numeric prefix/postfix symbols like $, %, €, +, −, and ° now stay attached to adjacent text the way browser line breaking does
- **fixed** — Soft-hyphen breaks now stay at the soft-hyphen insertion point instead of pulling post-hyphen graphemes onto the broken line
- **fixed** — Line geometry now preserves browser-style terminal letter spacing, including rich-inline item boundaries and visible soft-hyphen breaks
- **fixed** — Rich-inline item boundaries no longer overflow the requested width after a forced-progress break
- **fixed** — The markdown chat demo now drops parsed link URLs unless they resolve to HTTP(S) hrefs

###### Changed

- The package now declares itself side-effect-free so bundlers can tree-shake unused entrypoints (#160).
- `layoutNextLine()` and `layoutNextLineRange()` now avoid redundant chunk lookup in chunk-heavy manual layout paths (#140).

###### Fixed

- `{ wordBreak: 'keep-all' }` now handles no-space mixed Latin, numeric, and CJK text more like browsers.
- No-space punctuation chains now stay together for non-ASCII word-like text too, instead of only ASCII words.
- Opening punctuation such as `¡`, `¿`, German low quotes, and `⸘` now stays with the following word instead of dangling at line end (#165).
- Numeric prefix/postfix symbols like `$`, `%`, `€`, `+`, `−`, and `°` now stay attached to adjacent text the way browser line breaking does (#105).
- Soft-hyphen breaks now stay at the soft-hyphen insertion point instead of pulling post-hyphen graphemes onto the broken line (#162).
- Line geometry now preserves browser-style terminal letter spacing, including rich-inline item boundaries and visible soft-hyphen breaks (#171).
- Rich-inline item boundaries no longer overflow the requested width after a forced-progress break (#132).
- The markdown chat demo now drops parsed link URLs unless they resolve to HTTP(S) hrefs (#168).

### v0.0.6

- Date: 2026-04-22
- Version: v0.0.6
- Original notes: https://github.com/chenglou/pretext/releases/tag/v0.0.6
- Permalink: https://whatsnew.fyi/product/pretext/releases/v0.0.6

- **added** — Numeric CSS-pixel letterSpacing support on prepare(), prepareWithSegments(), and each existing rich-inline item
- **fixed** — CJK text followed by opening bracket annotations now wraps like browsers instead of leaving the opening bracket on the previous line

###### Added

- Numeric CSS-pixel `letterSpacing` support on `prepare()`, `prepareWithSegments()`, and each existing rich-inline item (#108, #156).

###### Fixed

- CJK text followed by opening bracket annotations now wraps like browsers instead of leaving the opening bracket on the previous line (#148).

### v0.0.5

- Date: 2026-04-08
- Version: v0.0.5
- Original notes: https://github.com/chenglou/pretext/releases/tag/v0.0.5
- Permalink: https://whatsnew.fyi/product/pretext/releases/v0.0.5

- **added** — Add geometry-first rich line helpers for manual layout work: measureLineStats(), measureNaturalWidth(), layoutNextLineRange(), and materializeLineRange()
- **added** — Add @chenglou/pretext/rich-inline, a narrow helper for inline-only rich text, mentions/chips, and browser-like boundary whitespace collapse
- **added** — Add { wordBreak: 'keep-all' } support on prepare() / prepareWithSegments() for CJK and Hangul text
- **added** — Add a virtualized markdown chat demo for rich inline text and pre-wrap layout
- **changed** — Make prepare-time analysis more resilient on long mixed-script, CJK, Arabic, repeated-punctuation, and other degenerate inputs
- **fixed** — Fix mixed CJK-plus-numeric runs, keep-all mixed-script boundaries, and long breakable runs to stay closer to browser behavior
- **fixed** — Fix rich-path bidi metadata and CJK detection to handle the relevant astral Unicode ranges correctly

###### Added

- Geometry-first rich line helpers for manual layout work: `measureLineStats()`, `measureNaturalWidth()`, `layoutNextLineRange()`, and `materializeLineRange()`.
- `@chenglou/pretext/rich-inline`, a narrow helper for inline-only rich text, mentions/chips, and browser-like boundary whitespace collapse.
- `{ wordBreak: 'keep-all' }` support on `prepare()` / `prepareWithSegments()` for CJK and Hangul text.
- A virtualized markdown chat demo for rich inline text and `pre-wrap` layout.

###### Changed

- Prepare-time analysis is more resilient on long mixed-script, CJK, Arabic, repeated-punctuation, and other degenerate inputs.

###### Fixed

- Mixed CJK-plus-numeric runs, keep-all mixed-script boundaries, and long breakable runs now stay closer to browser behavior.
- Rich-path bidi metadata and CJK detection now handle the relevant astral Unicode ranges correctly.

### v0.0.4

- Date: 2026-04-01
- Version: v0.0.4
- Original notes: https://github.com/chenglou/pretext/releases/tag/v0.0.4
- Permalink: https://whatsnew.fyi/product/pretext/releases/v0.0.4

- **added** — A justification comparison demo that shows native CSS justification, greedy hyphenation, and a Knuth-Plass-style paragraph layout side by side
- **changed** — Rich layout is faster on chunk-heavy and long-breakable text
- **fixed** — layout(), layoutWithLines(), and layoutNextLine() stay aligned on narrow ZWSP / grapheme-breaking edge cases
- **fixed** — The justification comparison demo no longer paints justified lines wider than their column

###### Added

- A justification comparison demo that shows native CSS justification, greedy hyphenation, and a Knuth-Plass-style paragraph layout side by side.

###### Changed

- Rich layout is faster on chunk-heavy and long-breakable text.

###### Fixed

- `layout()`, `layoutWithLines()`, and `layoutNextLine()` stay aligned on narrow `ZWSP` / grapheme-breaking edge cases.
- The justification comparison demo no longer paints justified lines wider than their column.