Interface AbcElemGraceNote

interface AbcElemGraceNote {
    acciaccatura?: true;
    accidental?: AccidentalName;
    duration: number;
    endBeam?: true;
    endSlur?: number[];
    endTie?: true;
    highestVert?: number;
    midipitch?: number;
    name: string;
    pitch: number;
    startBeam?: true;
    startSlur?: SlurProperties[];
    startTie?: TieProperties;
    style?: NoteHeadType;
    verticalPos: number;
}