Stencil v3.4.0 has been released, introducing a new feature that allows developers to validate core fields in a project's package.json against specific Stencil output target types, enhancing customization and control in publishing Stencil component libraries. This update requires developers to enable two configuration flags: `validatePrimaryPackageOutputTarget` and `isPrimaryPackageOutputTarget`, to specify the output target for validation, with warnings provided at build time if discrepancies are detected. While this release focuses on this validation feature, it also includes internal updates and dependency version bumps as part of ongoing improvements, with a more significant update anticipated with the upcoming Stencil v4 release.