Vendor Flow parser 0.267.0

[cknitt]

Summary

• vendor the Flow parser version currently used by ReScript (0.267.0) from the ReScript Flow fork
• include the required Flow Sedlex fork and collection helpers
• replace the external flow_parser package dependency with private Dune libraries
• document the exact upstream commit, included sources, adaptations, and licenses
• add focused parser tests to verify JavaScript, JSX, comments, and parse errors

This is the first, deliberately conservative step toward unblocking newer OCaml versions. It keeps the parser and compiler behavior unchanged while bringing the currently used sources under ReScript's control. A later PR can upgrade the vendored parser independently.

Related to #8567.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.91%. Comparing base (0f66af5) to head (7361545).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8587   +/-   ##
=======================================
  Coverage   75.90%   75.91%           
=======================================
  Files         474      475    +1     
  Lines       63000    63033   +33     
=======================================
+ Hits        47822    47853   +31     
- Misses      15178    15180    +2     

Files with missing lines	Coverage Δ
tests/ounit_tests/ounit_flow_parser_tests.ml	93.93% <ø> (ø)
tests/ounit_tests/ounit_tests_main.ml	100.00% <ø> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[pkg-pr-new]

Open in StackBlitz

rescript

npm i https://pkg.pr.new/rescript-lang/rescript@8587

@rescript/belt

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/belt@8587

@rescript/darwin-arm64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/darwin-arm64@8587

@rescript/darwin-x64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/darwin-x64@8587

@rescript/linux-arm64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/linux-arm64@8587

@rescript/linux-x64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/linux-x64@8587

@rescript/runtime

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/runtime@8587

@rescript/win32-x64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/win32-x64@8587

commit: 7361545

[cknitt]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 0e73ecedbe

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".