import { IBaseValidatorDefinition, IValidator } from "../interfaces";
export declare type IPresentValidatorDefinition = IBaseValidatorDefinition;
export declare class PresentValidator<T> implements IValidator<T | null, IPresentValidatorDefinition> {
    definition: IPresentValidatorDefinition;
    /**
     * Based on `[:space:]` defined in POSIX character classes.
     */
    private static rSpace;
    constructor(definition: IPresentValidatorDefinition);
    validate(input: T | null): {
        definition: IBaseValidatorDefinition;
        input: T | null;
    } | null;
}