ci: test against Node 20

[dinwwwh]

• Add Node 20 to the CI test matrix
• Fall back to ws WebSocket in crossws tests since Node 20 lacks a global WebSocket
• Upgrade pnpm to 12.0.0-beta.3

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Project	Deployment	Actions	Updated (UTC)
orpc	Error		Aug 3, 2026 7:38am

[pullfrog]

ℹ️ No critical issues — one note on the pnpm beta.

Reviewed changes

• Node 20 added to CI matrix — one-line addition in .github/workflows/ci.yaml.
• pnpm upgraded to 12.0.0-beta.3 — packageManager field in root package.json; lockfile regenerated.
• WebSocket fallback for crossws tests — the two crossws test helpers now import ws as a fallback constructor since Node 20 has no global WebSocket.

The typeof WebSocket !== 'undefined' guard is correct — it avoids the ReferenceError that would occur from referencing an undeclared global directly.

The pnpm beta upgrade affects all workflows (CI, release, codspeed, sponsor sync) since they all use pnpm/action-setup@v6 without a pinned version, which delegates to corepack. If you'd prefer to limit the beta exposure, you could pin pnpm/action-setup@v6 with version: 12 in the release workflow while keeping packageManager at a stable release. That's a judgement call — nothing blocking here.

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