bitfinex-node-api
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    Type Alias IAuthChannelType

    IAuthChannelType:
        | "bu"
        | "fcc"
        | "fcn"
        | "fcs"
        | "fcu"
        | "fiu"
        | "flc"
        | "fln"
        | "fls"
        | "flu"
        | "foc"
        | "fon"
        | "fos"
        | "fou"
        | "fte"
        | "ftu"
        | "miu"
        | "n"
        | "oc"
        | "on"
        | "os"
        | "ou"
        | "pc"
        | "pn"
        | "ps"
        | "pu"
        | "te"
        | "tu"

    Bitfinex v1 mnemonic for authenticated channel frames that we deliver as a raw envelope (i.e. not ws/wu/hb, which are decoded into their own typed messages). Using a literal union keeps IMessage discriminated so narrowing via msg.type === "ticker" actually excludes the envelope.