getPreLanguage

The default language id applied to preformatted code blocks in rendered doc comments that carry no class attribute.

When set (for example, "groovy"), a post-pass adds class="language-xxx" to the opening tag of such blocks, enabling syntax highlighting for legacy doc-comment code blocks without touching source files. Blocks that already carry any class attribute are left alone.

Only has an effect with Groovy 6.0.0 or later; the option is silently ignored with earlier Groovy versions.