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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import { InjectionToken } from '@angular/core';
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import { Observable } from 'rxjs/Observable';
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import { AsyncValidatorFn, ValidationErrors, Validator, ValidatorFn } from './directives/validators';
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import { AbstractControl } from './model';
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/**
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* Providers for validators to be used for {@link FormControl}s in a form.
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*
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* Provide this using `multi: true` to add validators.
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*
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* @stable
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*/
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export declare const NG_VALIDATORS: InjectionToken<(Function | Validator)[]>;
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/**
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* Providers for asynchronous validators to be used for {@link FormControl}s
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* in a form.
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*
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* Provide this using `multi: true` to add validators.
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*
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* See {@link NG_VALIDATORS} for more details.
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*
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* @stable
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*/
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export declare const NG_ASYNC_VALIDATORS: InjectionToken<(Function | Validator)[]>;
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/**
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* Provides a set of validators used by form controls.
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*
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* A validator is a function that processes a {@link FormControl} or collection of
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* controls and returns a map of errors. A null map means that validation has passed.
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*
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* ### Example
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*
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* ```typescript
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* var loginControl = new FormControl("", Validators.required)
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* ```
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*
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* @stable
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*/
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export declare class Validators {
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/**
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* Validator that requires controls to have a value greater than a number.
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*/
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static min(min: number): ValidatorFn;
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/**
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* Validator that requires controls to have a value less than a number.
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*/
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static max(max: number): ValidatorFn;
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/**
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* Validator that requires controls to have a non-empty value.
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*/
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static required(control: AbstractControl): ValidationErrors | null;
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/**
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* Validator that requires control value to be true.
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*/
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static requiredTrue(control: AbstractControl): ValidationErrors | null;
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/**
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* Validator that performs email validation.
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*/
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static email(control: AbstractControl): ValidationErrors | null;
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/**
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* Validator that requires controls to have a value of a minimum length.
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*/
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static minLength(minLength: number): ValidatorFn;
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/**
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* Validator that requires controls to have a value of a maximum length.
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*/
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static maxLength(maxLength: number): ValidatorFn;
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/**
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* Validator that requires a control to match a regex to its value.
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*/
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static pattern(pattern: string | RegExp): ValidatorFn;
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/**
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* No-op validator.
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*/
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static nullValidator(c: AbstractControl): ValidationErrors | null;
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/**
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* Compose multiple validators into a single function that returns the union
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* of the individual error maps.
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*/
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static compose(validators: null): null;
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static compose(validators: (ValidatorFn | null | undefined)[]): ValidatorFn | null;
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static composeAsync(validators: (AsyncValidatorFn | null)[]): AsyncValidatorFn | null;
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}
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export declare function toObservable(r: any): Observable<any>;
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