publish-preflight

To run preflight checks before an npm publish, execute a local validation script that verifies exports, engines, type definitions, and dist artifacts. This deterministic process identifies publishing blockers without producing side effects.

Npm publish preflight validation is the process of checking a package for missing exports, mismatched engine constraints, or missing dist files before release. You need it to prevent blockers when publishing packages to a registry.

Yes, you can validate package exports and type definitions across a monorepo before publish. The preflight checks use publint and attw to ensure exports, engines, and dist artifacts are correctly configured for all packages.

No, the preflight check script is non-destructive and deterministic. It safely validates readiness for npm publish locally or in CI without modifying your package or producing any side effects.

The best way to catch missing dist artifacts and engine mismatches is to run an end-to-end preflight validation using publint and attw. This verifies export paths, engines, type definitions, and dist presence before publishing.

Your npm package fails to publish due to type definition or export path errors because preflight validation identifies these blockers. Running checks with attw and publint verifies that exports and types are correctly configured.