AstKeyframesAtRule

interface AstKeyframesAtRule {
    "[ROOT]"?: AstStyleSheet | null;
    chi: (AstKeyframesRule | AstComment)[];
    errors?: ErrorDescription[];
    nam: string;
    parent?: any;
    state?: any;
    typ: KeyframesAtRuleNodeType;
    val: string;
    [key: number]: string | undefined;
}