[P1] CJS typecheck failing on main — 17+ failures since 2026-06-02 #36410

Summary

The CJS (js-typecheck) CI job is failing on every push to main and on related pull requests since approximately 2026-06-02T01:14Z. As of this report there are 17 failures today with a 0% success rate.

Failure Pattern

• Affected CI job: js-typecheck step: Run typecheck
• Trigger: Push to main, PRs touching actions/setup/js/**
• Started: ~2026-06-02T01:14Z (immediately after PR Fix copilot-sdk harness stdin wiring, SDK installation/resolution, custom-provider setup from /reflect, and remove duplicate harness timestamps #36358 merged)
• Latest failure: Run 26800690223
• Failure job URL: https://github.com/github/gh-aw/actions/runs/26800690223/job/79006514896

Likely Root Cause

PR #36358 (merged 2026-06-01T22:36Z) touched many files in actions/setup/js/, including .cjs files and potentially TypeScript type definitions. The typecheck failures started immediately after this merge.

Impact

• All main branch pushes are failing the CJS CI check
• PRs touching JS files cannot pass CI
• 17 failures on 2026-06-02 alone — blocking merges

Recommended Actions

1. Check the typecheck output from the failed runs for specific type errors
2. Review changes to actions/setup/js/ in PR Fix copilot-sdk harness stdin wiring, SDK installation/resolution, custom-provider setup from /reflect, and remove duplicate harness timestamps #36358 for type compatibility issues
3. Run make lint-cjs locally to reproduce
4. Fix type errors or update type definitions

References:

• Latest CJS failure
• Triggering commit cf5be42
• Workflow Health Run §26801601082

Generated by 🏥 Workflow Health Manager - Meta-Orchestrator · sonnet46 4.5M · ◷

• expires on Jun 3, 2026, 6:11 AM UTC