SingleParams

type SingleParams<Defs extends readonly AnyCustomId[]> =
    Defs extends readonly [infer One extends AnyCustomId]
        ? DecodedParams<One["shape"]>
        : never;

type SingleParams<Defs extends readonly AnyCustomId[]> =
    Defs extends readonly [infer One extends AnyCustomId]
        ? DecodedParams<One["shape"]>
        : never;