chore(deps): update dependency regal to v0.39.0 (9.4)

[elastic-renovate-prod]

This PR contains the following updates:

Package	Update	Change
regal	minor	0.38.1 -> 0.39.0

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Release Notes

StyraInc/regal (regal)

v0.39.0

We're happy to announce Regal v0.39.0, featuring 3 new linter rules, many language server improvements, and much faster linting!

New Rule: use-array-flatten

Category: idiomatic

The use-array-flatten rule recommends using array.flatten instead of nested array.concatenation (#​1873).

Avoid

package policy

flat1 := array.concat(arr1, array.concat(arr2, arr3))

flat2 := array.concat(arr1, array.concat(arr2, array.concat(arr3, arr4)))

Prefer

package policy

flat1 := array.flatten([arr1, arr2, arr3])

flat2 := array.flatten([arr1, arr2, arr3, arr4])

New Rule: use-object-union-n

Category: idiomatic

The use-object-union-n rule recommends using object.union_n over nested calls to object.union (#​1873).

Avoid

package policy

obj := object.union(obj1, object.union(obj2, obj3))

Prefer

package policy

obj := object.union_n([obj1, obj2, obj3])

New Rule: equals-over-count

Category: performance

The new optional equals-over-count rule suggests using direct equality comparisons rather than count when checking collection membership or emptiness (#​1878). This is a micro-optimization and not a general recommendation. Must be manually enabled.

Performance

This release brings an approximate 25% reduction in linting time through aggregate remodeling and Rego prepare stage optimizations (#​1838). Additional performance work includes Rego refactoring (#​1857, #​1884), AST transform improvements (#​1892), and various micro-optimizations (#​1866, #​1879).

Language Server Improvements

The language server now includes a semantic token framework for improved syntax highlighting (#​1845, #​1865, #​1870),
code actions for the constant-condition and redundant-existence-check fixers (#​1830).
and an opaTestProvider feature for test discovery (#​1888, #​1889, #​1898),

Completion performance is improved with a completionItem/resolve handler (#​1831),
and server capabilities are now properly exposed and consistent with the clients (#​1867, #​1880).

Note: Semantic token support is feature flagged and will be available in the next release.

Compiler Explorer

Regal now supports the VSCode-based OPA Explorer extension, providing a rich GUI to compare compiler stages directly in VS Code (#​1862) - thanks @​srenatus! A new "Format stages" option has also been added to the compiler explorer (#​1854) - thanks @​johanfylling!

Experimental: rq Engine Support

Initial support for the rq engine has been added (#​1872) - thanks @​charlesdaniels!

Various Improvements

• Improved redundant-existence-check rule (#​1897, fixes #​1805)
• Disabled zero-arity-function rule as opa-fmt now covers that (#​1885)

Bug Fixes

• Fix nil dereference on compiler errors in explorer (#​1837)
• Fix broken links to fixer page (#​1852)
• Fix false positive in use-some-for-output-vars (#​1886)
• Fix broken input.json completion provider (#​1891)

Dependency Updates

Regal has been upgraded to use OPA v1.14.0 and Go 1.26.

Documentation

• Added mise as an alternative installation method (#​1849) - thanks @​jylenhof!
• Updated installation documentation (#​1861)
• Updated note about eval and debug roots (#​1894)
• Show release badge when using pre-release versions (#​1899)

New Contributors

• @​jylenhof made their first contribution in https://github.com/open-policy-agent/regal/pull/1849
• @​charlesdaniels made their first contribution in https://github.com/open-policy-agent/regal/pull/1872

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Configuration

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🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-04-16 20:23 UTC · Rule: default
• ✅ Checks started · on draft merge queue: embarking 9.4 (462416a) and #4478 together #4668
• 🚫 Left the queue — 2026-04-16 21:02 UTC · at a9ed9a665259d1e890a605f507bd46b31b46edea

This pull request spent 39 minutes 17 seconds in the queue, with no time running CI.

Waiting for:

• check-success=Lint
• check-success=Manifest Tests
• check-success=Package Cloudbeat (docker)
• check-success=Package Cloudbeat (tar.gz)
• check-success=Test Rego Policies
• check-success=Unit Test
• any of:
  • check-neutral = Unit Test
  • check-skipped = Unit Test
  • check-success = Unit Test
• any of:
  • check-neutral = Lint
  • check-skipped = Lint
  • check-success = Lint
• any of:
  • check-neutral = Package Cloudbeat (docker)
  • check-skipped = Package Cloudbeat (docker)
  • check-success = Package Cloudbeat (docker)
• any of:
  • check-neutral = Package Cloudbeat (tar.gz)
  • check-skipped = Package Cloudbeat (tar.gz)
  • check-success = Package Cloudbeat (tar.gz)

All conditions

• check-success=Lint
• check-success=Manifest Tests
• check-success=Package Cloudbeat (docker)
• check-success=Package Cloudbeat (tar.gz)
• check-success=Test Rego Policies
• check-success=Unit Test
• any of [🛡 GitHub branch protection]:
  • check-neutral = Unit Test
  • check-skipped = Unit Test
  • check-success = Unit Test
• any of [🛡 GitHub branch protection]:
  • check-neutral = Lint
  • check-skipped = Lint
  • check-success = Lint
• any of [🛡 GitHub branch protection]:
  • check-neutral = Package Cloudbeat (docker)
  • check-skipped = Package Cloudbeat (docker)
  • check-success = Package Cloudbeat (docker)
• any of [🛡 GitHub branch protection]:
  • check-neutral = Package Cloudbeat (tar.gz)
  • check-skipped = Package Cloudbeat (tar.gz)
  • check-success = Package Cloudbeat (tar.gz)
• #approved-reviews-by >= 1 [🛡 GitHub branch protection]
  • chore(deps): update dependency regal to v0.39.0 (9.4) #4478
• #approved-reviews-by >= 1 [🛡 GitHub repository ruleset rule [org] Require a PR for Renovate]
  • chore(deps): update dependency regal to v0.39.0 (9.4) #4478
• #approved-reviews-by >= 1 [🛡 GitHub repository ruleset rule [org] Require a PR]
  • chore(deps): update dependency regal to v0.39.0 (9.4) #4478
• #changes-requested-reviews-by = 0 [🛡 GitHub branch protection]
  • chore(deps): update dependency regal to v0.39.0 (9.4) #4478
• #changes-requested-reviews-by = 0 [🛡 GitHub repository ruleset rule [org] Require a PR for Renovate]
  • chore(deps): update dependency regal to v0.39.0 (9.4) #4478
• #changes-requested-reviews-by = 0 [🛡 GitHub repository ruleset rule [org] Require a PR]
  • chore(deps): update dependency regal to v0.39.0 (9.4) #4478

Reason

Pull request #4478 has been merged manually at a5a96c0

Hint

You were too fast!