hearth-standard-extensions

To load Scala macro extensions only once per bundle, mix the LoadStandardExtensionsOnce trait into your macro bundle to guard initialization and ensure a single call to Environment.loadStandardExtensions().

Macro bundles repeatedly initialize standard extensions in Scala because they lack a per-module loading guard, which results in duplicate calls to Environment.loadStandardExtensions() and noisy logs.

The best way to prevent duplicate extension loading across Scala 2 and Scala 3 macro bundles is to apply a centralized per-module LoadStandardExtensionsOnce trait that guards initialization.

Yes, you can use a single initialization pattern for yaml-derivation, avro-derivation, and circe-derivation modules by mixing the LoadStandardExtensionsOnce trait into their respective macro bundles.

Yes, you need a per-module LoadStandardExtensionsOnce trait to avoid noisy logs during compile-time derivation, as it ensures standard extensions are loaded exactly once per macro bundle.

The Hearth standard extensions loading pattern solves the problem of repeated initialization in macro bundles by ensuring standard extensions are loaded exactly once per bundle to eliminate noisy logs.