Function isCmcdEventKey

Returns key is
    | "br"
    | `${string}-${string}`
    | "v"
    | "tb"
    | "bl"
    | "mtp"
    | "cid"
    | "pr"
    | "sf"
    | "sid"
    | "st"
    | "e"
    | "ab"
    | "tbl"
    | "cdn"
    | "ltc"
    | "bg"
    | "sta"
    | "pb"
    | "ts"
    | "tpb"
    | "lb"
    | "tab"
    | "lab"
    | "pt"
    | "ec"
    | "msd"
    | "sn"
    | "df"
    | "cs"

true if the key is a valid CMCD event key, false otherwise.

equal(isCmcdEventKey('e'), true);
equal(isCmcdEventKey('cmsdd'), false);
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