export declare const precedence: {
    '==': number;
    '!=': number;
    '>': number;
    '<': number;
    '>=': number;
    '<=': number;
    'contains': number;
    'and': number;
    'or': number;
};
export declare const operatorImpls: {
    [key: string]: (lhs: any, rhs: any) => boolean;
};
export declare function isOperator(token: string): boolean;