Interface Move

interface Move {
    from:
        | "a1"
        | "a2"
        | "a3"
        | "a4"
        | "a5"
        | "a6"
        | "a7"
        | "a8"
        | "b1"
        | "b2"
        | "b3"
        | "b4"
        | "b5"
        | "b6"
        | "b7"
        | "b8"
        | "c1"
        | "c2"
        | "c3"
        | "c4"
        | "c5"
        | "c6"
        | "c7"
        | "c8"
        | "d1"
        | "d2"
        | "d3"
        | "d4"
        | "d5"
        | "d6"
        | "d7"
        | "d8"
        | "e1"
        | "e2"
        | "e3"
        | "e4"
        | "e5"
        | "e6"
        | "e7"
        | "e8"
        | "f1"
        | "f2"
        | "f3"
        | "f4"
        | "f5"
        | "f6"
        | "f7"
        | "f8"
        | "g1"
        | "g2"
        | "g3"
        | "g4"
        | "g5"
        | "g6"
        | "g7"
        | "g8"
        | "h1"
        | "h2"
        | "h3"
        | "h4"
        | "h5"
        | "h6"
        | "h7"
        | "h8";
    promotion?: PromotionPieceType;
    to: | "a1"
    | "a2"
    | "a3"
    | "a4"
    | "a5"
    | "a6"
    | "a7"
    | "a8"
    | "b1"
    | "b2"
    | "b3"
    | "b4"
    | "b5"
    | "b6"
    | "b7"
    | "b8"
    | "c1"
    | "c2"
    | "c3"
    | "c4"
    | "c5"
    | "c6"
    | "c7"
    | "c8"
    | "d1"
    | "d2"
    | "d3"
    | "d4"
    | "d5"
    | "d6"
    | "d7"
    | "d8"
    | "e1"
    | "e2"
    | "e3"
    | "e4"
    | "e5"
    | "e6"
    | "e7"
    | "e8"
    | "f1"
    | "f2"
    | "f3"
    | "f4"
    | "f5"
    | "f6"
    | "f7"
    | "f8"
    | "g1"
    | "g2"
    | "g3"
    | "g4"
    | "g5"
    | "g6"
    | "g7"
    | "g8"
    | "h1"
    | "h2"
    | "h3"
    | "h4"
    | "h5"
    | "h6"
    | "h7"
    | "h8";
}