import { AbstractControl, FormControl, ValidationErrors } from '@angular/forms';
import { Observable } from 'rxjs';
import { HttpClient } from '@angular/common/http';
export interface ValidationResult {
    [key: string]: boolean;
}
interface AsyncValidatorFn {
    (c: AbstractControl): Promise<ValidationErrors | null> | Observable<ValidationErrors | null>;
}
export declare class NgxValidators {
    /**
     * Test if the input is number.
     * Allow only number or + or - or .
     * If not number, return isNumberError object.
     * */
    static isNumber(control: FormControl): ValidationResult;
    /**
     * Test if the password strong enough.
     * Password should contain number and uppercase letter and lower case letter and length should more than 7
     * If not strong enough, return strongPasswordError object.
     * */
    static strongPassword(control: FormControl): ValidationResult;
    /**
     * Compare two password to validate if they are match
     * If not match, return matchPasswordError object.
     * */
    static matchPassword(repeatPassword: string): (control: FormControl) => {
        matchPasswordError: boolean;
    };
    /**
     * This control is required if the input control has value.
     * */
    static requiredIfInputHasValue(inputControlName: string): (control: FormControl) => {
        required: boolean;
    };
    /**
     * only allow letters/numbers
     * */
    static numberLetterOnly(control: FormControl): ValidationResult;
    /**
     * only allow letters/numbers/space
     * */
    static numberLetterSpaceOnly(control: FormControl): ValidationResult;
    /**
     * should not contain blank
     * */
    static noBlank(control: FormControl): {
        [key: string]: boolean;
    };
    /**
     * Validate from backend if this field is duplicate or not.
     * Input url string and HttpClient and the validator will get to your url,
     * if the response is equal to true -> not duplicate
     * if the response is not equal to true -> duplicate
     * */
    static asyncDuplicate(url: string, http: HttpClient, expectValue: any): AsyncValidatorFn;
    /**
     * should not contain blank
     * */
    static isUrl(control: FormControl): {
        [key: string]: boolean;
    };
}
export {};