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Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Deploying to production on an odd-numbered Node major (e.g. 21, 23) expecting long-term support

// Wrong: v21 never becomes LTS, EOL in ~9 months
// engines: { "node": ">=21" }

// Correct: v20 is Active LTS with a 30-month lifecycle
// engines: { "node": ">=20 <21" }

The Solution //

Odd-numbered majors are Current-only releases — they never enter the LTS track and reach End-of-Life just months after release, with no Maintenance phase safety net. Production workloads should always target the current Active LTS (an even-numbered major), reserving odd releases for previewing upcoming features in non-critical environments.

The Error //

Setting engines in package.json but never enforcing it in CI or locally

# .npmrc — makes engines actually binding
engine-strict=true

The Solution //

An unenforced engines field is documentation, not a guarantee — npm only prints a warning by default and continues installing anyway, so a developer on the wrong Node version can still push code that breaks in production. Add engine-strict=true to .npmrc (or an explicit CI version check) so a mismatch fails the build instead of silently shipping.