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I'm presuming it should be: NonAnyType → PrimitiveType TypeSuffix | "ByteString" TypeSuffix | "DOMString" TypeSuffix | identifier TypeSuffix | "sequence" "<" Type ">" Null | "object" TypeSuffix | "Date" TypeSuffix | "RegExp" TypeSuffix | "Promise" "<" Type ">"
This seems to have been fixed at some point https://heycam.github.io/webidl/#prod-PromiseType