export declare const Convert: (input: any, to: any, onError?: any, onNull?: any) => {
    $convert: {
        input: any;
        to: any;
        onError: any;
        onNull: any;
    };
};
export declare const IsNumber: (expression: any) => {
    $isNumber: any;
};
export declare const ToBool: (expression: any) => {
    $toBool: any;
};
export declare const ToDecimal: (expression: any) => {
    $toDecimal: any;
};
export declare const ToDouble: (expression: any) => {
    $toDouble: any;
};
export declare const ToInt: (expression: any) => {
    $toInt: any;
};
export declare const ToLong: (expression: any) => {
    $toLong: any;
};
export declare const ToObjectId: (expression: any) => {
    $toObjectId: any;
};
export declare const Type: (expression: any) => {
    $type: any;
};