Missing type definitions for move descriptor methods

[mut-ex]

The exported Move type from the module does not include the following methods:

    isCapture(): boolean;
    isPromotion(): boolean;
    isEnPassant(): boolean;
    isKingsideCastle(): boolean;
    isQueensideCastle(): boolean;
    isBigPawn(): boolean;

As a result when I attempt to call these methods on a move returned from validateMove(), I get an error from the linter about these properties not existing on type Move