import { QueryRefiner } from '../repository/interfaces';
import { ISpecification } from './specification.interface';
export declare function isSpecification<T>(obj: ISpecification<T> | any): obj is ISpecification<T>;
export declare function isQueryable<T extends object>(obj: any): obj is QueryRefiner<T>;
export declare const SQLConstants: {
    FALSE: string;
    TRUE: string;
};
export declare const SQLStringFunctions: {
    startsWith: string;
    endsWith: string;
    includes: string;
    toLowerCase: string;
    toUpperCase: string;
};
export declare const SQLArrayFunctions: {
    includes: string;
};
export declare const SQLJoinFunctions: {
    some: string;
};
export declare const ComparisonOperators: {
    ALL: string[];
    EQUAL_TO: string;
    STRICTLY_EQUAL_TO: string;
    GREATER_THAN_OR_EQUAL: string;
    GREATER_THAN: string;
    LESS_THAN_OR_EQUAL: string;
    LESS_THAN: string;
    NOT_EQUAL_TO: string;
    STRICTLY_NOT_EQUAL_TO: string;
};
export declare function convertToSqlComparisonOperator(op: string, val?: any): string;
export declare function format(toFormat: string, ...args: string[]): string;