missing_doc

An exported declaration with no comment above it.

Pedantic. An export is the interface of the module. A comment line right above it, -- or ---, says what it is for; the language server shows it on hover. An exported type alias and an exported interface answer to missing_doc_type instead, which is off.

Set its level in the [lint] table of alloy.toml, or for one file with --@alloy-lint.