Assessment · CG-NODE-2041

Node.js Runtime Upgrade Assessment

Production services and shared packages moving from Node.js 16/18 to Node.js 20.

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Snapshot Commit 8a4c9d2Target Node.js 20 LTSScope Production platformLast scan 05 Aug 2026, 09:42 UTC

Executive overview

Migration readiness

Action required

Readiness78%12 points gained since baseline

Estimated effort24–32engineer-days

ConfidenceMedium–high91% evidence coverage

Blockers84 high-severity

The migration is technically viable through a dependency-led phased strategy. Shared authentication and observability packages must move before four production services. CI runtime pins, native package compatibility, contract-test gaps, and rollback-image verification remain the primary constraints.

14repositories

8production services

3shared packages

42direct dependencies

219transitive dependencies

Readiness dimensions

Eight dimensions determine cutover confidence.

78% overall

Dependency compatibility84%

Application code76%

Test readiness68%

Infrastructure88%

Operations81%

Ownership92%

Documentation74%

Rollback preparation72%

Readiness movement

Dependency preparation and CI updates raised readiness by 12 points. Contract validation and rollback verification offer the next highest-confidence gains.

Findings

58 evidence-backed findings

8 blockers11 high23 medium16 low7 manual review

SeverityFindingEvidenceConfidenceAction

BlockerNative package compatibility not verifiedpayments-apipackage-lock.json · better-sqlite3@7.6.2HighBuild against Node.js 20 and run native integration suite.

BlockerCI workflow pinned to legacy runtimeidentity-service.github/workflows/release.yml:31HighMove build and release jobs to the target runtime.

HighShared internal package blocks four servicesplatform-authpackages/auth/package.json:18HighUpgrade the package in Wave 2 before service migrations.

HighCritical endpoint missing contract testscheckout-apisrc/routes/checkout.ts:84MediumAdd provider and consumer contracts before runtime change.

MediumDeprecated runtime API remains in workernotification-workersrc/process/spawn.ts:47HighReplace the deprecated invocation and add process-exit tests.

ReviewRollback image not verifiedorders-servicedeploy/production.yaml:112MediumPull, deploy, and smoke-test the previous production image.

Impact graph

Shared dependencies determine sequence.

ApplicationServiceDatabaseExternal

Solid connectors represent direct dependencies. Dashed connectors represent transitive or inferred operational relationships.

Strategy recommendation

Phased migration by shared dependency.

Recommended

Phased by dependencyLowest coordination risk

Prepare shared packages first, then migrate services in dependency order with canary release gates.

24–32 engineer-days

Dual-runtime transitionHigher operational load

Maintain compatible build and deployment paths for both runtime generations during service movement.

31–43 engineer-days

Coordinated cutoverHighest blast radius

Move shared packages and dependent services in one release window with a single rollback decision.

20–28 engineer-days

Migration waves

Seven ordered execution stages.

31 owned tasks

Wave 0
Establish the safety baseline
Capture performance, error rates, dependency inventory, contract coverage, and tested rollback state.
Complete
Wave 1
Prepare the toolchain
Update CI runners, build images, type definitions, linters, test workers, and release jobs.
Complete
Wave 2
Upgrade shared packages
Move platform-auth, observability-core, and config-runtime before their dependent services.
At risk
Wave 3
Migrate low-risk services
Move notification-worker, admin-api, reporting, and user-service through canary gates.
Pending
Wave 4
Migrate critical services
Move checkout, payments, orders, and identity with full contract and rollback validation.
Pending
Wave 5
Production cutover
Complete approval review, verify thresholds, move production traffic, and hold the recovery window.
Pending
Wave 6
Cleanup
Remove legacy images, runtime pins, compatibility branches, and temporary observability rules.
Pending

Cutover gates

Production movement requires verified conditions.

6 of 9 ready

✓BuildPassed on target runtimePassed

✓Unit tests2,841 checks passedPassed

✓Integration tests184 checks passedPassed

×Contract testsCheckout coverage missingBlocked

!PerformanceP95 within 6% of baselineAt risk

✓Error-rate thresholdBelow 0.5% in canaryPassed

✓MonitoringDashboards and alerts readyPassed

!Rollback availabilityOne image unverifiedAt risk

○Required approvalsOperations approval openPending

Rollback checklist

Recovery readiness before traffic moves.

1 action open

✓
Previous production images retained
Immutable image digests recorded for all eight services.
✓
Database compatibility confirmed
No irreversible schema movement is included in the runtime cutover.
✓
Traffic switch procedure tested
Canary and full rollback routes verified in the production gateway.
!
Orders service image requires smoke test
Previous image exists but has not been deployed in the recovery environment during this assessment cycle.
✓
Decision owner assigned
Platform operations owns the rollback call during the migration window.

Evidence records

Every conclusion remains traceable.

Commit-pinned

Migration rule→Dependency version→Repository→Commit→File and line→Affected service→Migration task→Validation gate

Rule: NODE-NATIVE-017
Dependency: better-sqlite3@7.6.2
Repository: payments-api
Commit: 8a4c9d2
Path: package-lock.json:1482
Confidence: High
Owner: Payments Platform
Gate: Native integration suite

No unexplained scores. No unsupported recommendations. Estimates are expressed as ranges with assumptions, exclusions, unknowns, and confidence—not false precision.

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