ArgNames
Type, in @jr2/orchestrator/src/effect.ts. It is type plumbing: it computes a type from the types of a Machine or of its parts, and a workflow module does not write it. The signature of an export, or a type that it names, names this type, so its declaration is here. The Authoring surface page lists each export.
ts
type ArgNames<A extends readonly unknown[]> = A[number] extends infer E ? (E extends Arg<infer N> ? N : never) : never;