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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe changes add preparation records for BAML 0.19.0, a backtest for 0.18.0, release notes, validation records, follow-up drafts, and website deployment configuration. ChangesBAML release preparation and backtest
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This change prepares BAML 0.18.0 and 0.19.0 release documentation and enables the 0.19.0 release post for website preview. No concrete current-head issue remains that blocks merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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| ## Use public parsing and testing APIs | ||
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| Parser caches and polling sentinels are now internal: `baml.sap.ParseCache`, `NoYield`, `baml.csv.CsvNeedData`, `CsvSkip`, and `CsvHeaders` gained underscore-prefixed names. Testing registry execution/selection helpers and pool types also became internal. Use `baml.sap.parse<T>()` or `parse_type()` for parsing, CSV readers for records, and authored `test`/`testset` blocks or the public testing runners. Provider implementation helpers under `*.internal` also dropped provider-name prefixes; those helpers are not stable public APIs. ([#4725](https://github.com/BoundaryML/baml/pull/4725)) |
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When users upgrade code that calls baml.sap.parse or parse_type, #4623 changes both APIs from throws baml.errors.LlmClient to throws baml.errors.ParseError. Wrappers with an explicit LlmClient throws clause or catch arm therefore require migration, but this section only describes internal helper renames and attributes the change solely to #4725. Add the before/after error contract and reference #4623 so users can resolve the resulting compiler failures.
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Actionable comments posted: 1
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Inline comments:
In `@typescript2/app-website/blog-releases/2026-09-08-baml-0.19.0.md`:
- Line 217: Update the migration table entry for baml.yaml.YamlParseError so it
remains exactly two columns; move the `#4725` citation out of the table and into
the surrounding section text or below the table.
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📒 Files selected for processing (9)
docs/changelog-preparation/0.19.0/README.mddocs/changelog-preparation/0.19.0/source-coverage.mddocs/changelog-preparation/0.19.0/step1a-all-prs.mddocs/changelog-preparation/0.19.0/step1b-prs-only-user-visible.mddocs/changelog-preparation/0.19.0/step2a-pr-user-effects.mddocs/changelog-preparation/0.19.0/step2b-pr-user-effects-reaggregated.mddocs/changelog-preparation/0.19.0/step3-followup-actions.mddocs/changelog-preparation/0.19.0/validation.mdtypescript2/app-website/blog-releases/2026-09-08-baml-0.19.0.md
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sxlijin
changed the title
2b91583 to
32b6c88
Compare
Backtests changelog preparation against
baml-language-0.17.0..baml-language-0.18.0and prepares a BAML 0.19.0 post enabled for website preview for the September 8 Pacific canary cut at5b398f2b60cfa78258ac9534e8322d056564e85f.Stacked on the website highlighting and styling fix in #4788, which should merge first.
The preparation guide is maintained separately in #4784. This PR contains the release posts and their supporting audit artifacts.
Changes
isPublished: truefor PR preview. Merging intocanaryalso makes the post eligible for production publication. Keep the 0.18.0 backtest unpublished with a unique slug and preserve the historical 0.18.0 post. No package releases or notifications are published.Start with
docs/changelog-backtests/0.18.0/README.mdanddocs/changelog-preparation/0.19.0/README.md.Testing
git diff --check. Validated the updated Vercel JSON and the 0.19.0 publication flag. The moved backtest content is unchanged except its link to the separate guide PR.Each release directory contains a detailed validation record and limits. SDK/platform matrices and a published 0.19.0 smoke test remain release-time checks. The float PR’s unlinked Discord discussion remains an explicit followup gap.
Review context carried with the backtest
Two original automated backtest findings now belong to this PR: the ModelTurn calls-field migration and the concrete ai.Runner implementation example. Their old threads are out of scope for the guide-only #4784.
Summary by CodeRabbit
New Features
call()andparse()methods.Breaking Changes
Bug Fixes
Documentation