Detector::Elixir::Plug

forward "/api", to: SomeRouter — Plug.Router's mount macro, in the bare and parenthesized call forms.

The marker this replaces was "forward " AND "do:", and neither half is Plug's: do: is Elixir's one-line function body and appears in nearly every module, while forward is an ordinary identifier. Any context module with a forward variable and a def …, do: … was detected as Plug, so a plain Phoenix/Ecto project ran the Plug analyzer over its whole tree for nothing.

to: is matched anywhere after the path rather than as the first option, because forward/2 takes :host, :init_opts, :private and :assigns in any order (forward "/", host: "api.", to: Api).

Cheap filename-only filter the detector pass uses to skip detect on files the detector cannot possibly match. The default true preserves prior behavior (every detector runs on every file). Override with the same predicate the body of detect starts with — e.g., filename.ends_with?(".py") for a Python framework detector — so the detector loop avoids the detect dispatch on files outside the detector's language.

On large codebases (saleor's 4255 .py files) this lifts ~100 virtual detect calls per file out of the hot loop because most detectors' inner first-line is exactly this kind of cheap filename check.

The tech name; detector_for overrides it. Empty on the bare base.