Convert sync.py to TypeScript

[mbg]

This PR takes a first step at converting a script from Python to TypeScript. Concretely, it replaces the sync.py script that turns our PR check specifications into GitHub Actions workflows with a roughly equivalent TypeScript replacement.

Initially, I aimed for exact textual equivalence in the output between the two scripts, but then I ultimately allowed a few minor changes:

• The formatting of the steps from the specification is now preserved more accurately.
  • This mainly allows more comments from the specification to be preserved and in more accurate locations.
  • There are also some cases where there are now quoted strings in the output where there weren't quotes before. For consistency, all double quoted strings in the steps are converted to single quoted strings.
• The yaml package allows for unlimited line length, which ruamel.yaml didn't quite handle correctly before, so some lines are no longer wrapped as intended.

I initially started by using js-yaml, since we already use this elsewhere in the repo, but then switched to yaml since it gave me more control over the formatting.

Follow-up in #3529 for sync_back.py.

Risk assessment

For internal use only. Please select the risk level of this change:

• Low risk: Changes are fully under feature flags, or have been fully tested and validated in pre-production environments and are highly observable, or are documentation or test only.

Which use cases does this change impact?

Environments:

• Testing/None - This change does not impact any CodeQL workflows in production.

How did/will you validate this change?

• End-to-end tests - I am depending on PR checks (i.e. tests in pr-checks).

If something goes wrong after this change is released, what are the mitigation and rollback strategies?

• Rollback - Change can only be disabled by rolling back the release or releasing a new version with a fix.

How will you know if something goes wrong after this change is released?

• Other - Please provide details.

Are there any special considerations for merging or releasing this change?

• No special considerations - This change can be merged at any time.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Consider adding a changelog entry for this change.
• Confirm the readme and docs have been updated if necessary.

[Copilot]

Pull request overview

Replaces the Python-based PR-check workflow generator with a TypeScript implementation, updating the workflow-generation toolchain and regenerating the affected __*.yml workflows under .github/workflows.

Changes:

• Added pr-checks/sync.ts (TypeScript replacement for sync.py) using the yaml package to preserve step formatting/comments.
• Updated pr-checks/sync.sh to run the new generator via tsx and introduced a dedicated pr-checks/package.json + lockfile.
• Regenerated the __*.yml workflows and made small formatting adjustments in a couple of check specs.

Reviewed changes

Copilot reviewed 42 out of 45 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tsconfig.json	Excludes pr-checks from the main TypeScript compilation scope.
eslint.config.mjs	Ignores pr-checks/** for ESLint runs.
pr-checks/sync.ts	New TypeScript workflow generator (replaces Python behavior).
pr-checks/sync.sh	Switches generator execution from Python/ruamel to Node/tsx.
pr-checks/package.json	Adds Node dependencies needed to run sync.ts.
pr-checks/package-lock.json	Locks pr-checks generator dependencies for reproducibility.
pr-checks/.gitignore	Ignores pr-checks/node_modules.
pr-checks/checks/upload-sarif.yml	Minor formatting/quoting changes in if: conditions.
pr-checks/checks/bundle-from-nightly.yml	Minor formatting change to if: condition style.
.github/workflows/__all-platform-bundle.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__analysis-kinds.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__analyze-ref-input.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__autobuild-action.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__autobuild-direct-tracing-with-working-dir.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__build-mode-autobuild.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__build-mode-manual.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__build-mode-none.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__build-mode-rollback.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__bundle-from-nightly.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__cleanup-db-cluster-dir.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__config-export.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__diagnostics-export.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__export-file-baseline-information.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__go-custom-queries.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__go-indirect-tracing-workaround-diagnostic.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__go-indirect-tracing-workaround-no-file-program.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__init-with-registries.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__job-run-uuid-sarif.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__language-aliases.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__local-bundle.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__multi-language-autodetect.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__packaging-codescanning-config-inputs-js.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__packaging-config-inputs-js.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__packaging-config-js.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__packaging-inputs-js.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__remote-config.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__resolve-environment-action.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__split-workflow.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__start-proxy.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__submit-sarif-failure.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__swift-custom-build.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__unset-environment.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__upload-ref-sha-input.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__upload-sarif.yml	Regenerated workflow output (formatting/quoting changes).
.github/workflows/__with-checkout-path.yml	Regenerated workflow output (formatting/quoting changes).

Files not reviewed (1)

• pr-checks/package-lock.json: Language not supported

[esbena]

(submitting probably empty review for technical reasons, complete review will follow)

[esbena]

LGTM, I only have some stylistic comments. The migration is pleasantly simple, and the near zero-diff strategy seems robust enough here.

[mbg]

@esbena Thanks for the review! I think I have come up with reasonably good ways to address your feedback. In particular:

• I have eliminated isTruthy entirely since that was mainly handling cases where we used strings instead of booleans in the specifications. I have changed them to all use booleans where isTruthy was previously used.
• We didn't actually use the custom inputs in workflow specifications, so all of them were statically known in the script. I have typed them to make this more explicit.

[esbena]

Thanks for the follow-ups. LGTM.