@angular/forms
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Angular - directives and services for creating forms
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JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { InjectionToken, ɵisObservable as isObservable, ɵisPromise as isPromise, ɵRuntimeError as RuntimeError } from '@angular/core';
import { forkJoin, from } from 'rxjs';
import { map } from 'rxjs/operators';
const NG_DEV_MODE = typeof ngDevMode === 'undefined' || !!ngDevMode;
function isEmptyInputValue(value) {
/**
* Check if the object is a string or array before evaluating the length attribute.
* This avoids falsely rejecting objects that contain a custom length attribute.
* For example, the object {id: 1, length: 0, width: 0} should not be returned as empty.
*/
return value == null ||
((typeof value === 'string' || Array.isArray(value)) && value.length === 0);
}
function hasValidLength(value) {
// non-strict comparison is intentional, to check for both `null` and `undefined` values
return value != null && typeof value.length === 'number';
}
/**
* @description
* An `InjectionToken` for registering additional synchronous validators used with
* `AbstractControl`s.
*
* @see `NG_ASYNC_VALIDATORS`
*
* @usageNotes
*
* ### Providing a custom validator
*
* The following example registers a custom validator directive. Adding the validator to the
* existing collection of validators requires the `multi: true` option.
*
* ```typescript
* @Directive({
* selector: '[customValidator]',
* providers: [{provide: NG_VALIDATORS, useExisting: CustomValidatorDirective, multi: true}]
* })
* class CustomValidatorDirective implements Validator {
* validate(control: AbstractControl): ValidationErrors | null {
* return { 'custom': true };
* }
* }
* ```
*
* @publicApi
*/
export const NG_VALIDATORS = new InjectionToken('NgValidators');
/**
* @description
* An `InjectionToken` for registering additional asynchronous validators used with
* `AbstractControl`s.
*
* @see `NG_VALIDATORS`
*
* @usageNotes
*
* ### Provide a custom async validator directive
*
* The following example implements the `AsyncValidator` interface to create an
* async validator directive with a custom error key.
*
* ```typescript
* @Directive({
* selector: '[customAsyncValidator]',
* providers: [{provide: NG_ASYNC_VALIDATORS, useExisting: CustomAsyncValidatorDirective, multi:
* true}]
* })
* class CustomAsyncValidatorDirective implements AsyncValidator {
* validate(control: AbstractControl): Promise<ValidationErrors|null> {
* return Promise.resolve({'custom': true});
* }
* }
* ```
*
* @publicApi
*/
export const NG_ASYNC_VALIDATORS = new InjectionToken('NgAsyncValidators');
/**
* A regular expression that matches valid e-mail addresses.
*
* At a high level, this regexp matches e-mail addresses of the format `local-part@tld`, where:
* - `local-part` consists of one or more of the allowed characters (alphanumeric and some
* punctuation symbols).
* - `local-part` cannot begin or end with a period (`.`).
* - `local-part` cannot be longer than 64 characters.
* - `tld` consists of one or more `labels` separated by periods (`.`). For example `localhost` or
* `foo.com`.
* - A `label` consists of one or more of the allowed characters (alphanumeric, dashes (`-`) and
* periods (`.`)).
* - A `label` cannot begin or end with a dash (`-`) or a period (`.`).
* - A `label` cannot be longer than 63 characters.
* - The whole address cannot be longer than 254 characters.
*
* ## Implementation background
*
* This regexp was ported over from AngularJS (see there for git history):
* https://github.com/angular/angular.js/blob/c133ef836/src/ng/directive/input.js#L27
* It is based on the
* [WHATWG version](https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address) with
* some enhancements to incorporate more RFC rules (such as rules related to domain names and the
* lengths of different parts of the address). The main differences from the WHATWG version are:
* - Disallow `local-part` to begin or end with a period (`.`).
* - Disallow `local-part` length to exceed 64 characters.
* - Disallow total address length to exceed 254 characters.
*
* See [this commit](https://github.com/angular/angular.js/commit/f3f5cf72e) for more details.
*/
const EMAIL_REGEXP = /^(?=.{1,254}$)(?=.{1,64}@)[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;
/**
* @description
* Provides a set of built-in validators that can be used by form controls.
*
* A validator is a function that processes a `FormControl` or collection of
* controls and returns an error map or null. A null map means that validation has passed.
*
* @see [Form Validation](/guide/form-validation)
*
* @publicApi
*/
export class Validators {
/**
* @description
* Validator that requires the control's value to be greater than or equal to the provided number.
*
* @usageNotes
*
* ### Validate against a minimum of 3
*
* ```typescript
* const control = new FormControl(2, Validators.min(3));
*
* console.log(control.errors); // {min: {min: 3, actual: 2}}
* ```
*
* @returns A validator function that returns an error map with the
* `min` property if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static min(min) {
return minValidator(min);
}
/**
* @description
* Validator that requires the control's value to be less than or equal to the provided number.
*
* @usageNotes
*
* ### Validate against a maximum of 15
*
* ```typescript
* const control = new FormControl(16, Validators.max(15));
*
* console.log(control.errors); // {max: {max: 15, actual: 16}}
* ```
*
* @returns A validator function that returns an error map with the
* `max` property if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static max(max) {
return maxValidator(max);
}
/**
* @description
* Validator that requires the control have a non-empty value.
*
* @usageNotes
*
* ### Validate that the field is non-empty
*
* ```typescript
* const control = new FormControl('', Validators.required);
*
* console.log(control.errors); // {required: true}
* ```
*
* @returns An error map with the `required` property
* if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static required(control) {
return requiredValidator(control);
}
/**
* @description
* Validator that requires the control's value be true. This validator is commonly
* used for required checkboxes.
*
* @usageNotes
*
* ### Validate that the field value is true
*
* ```typescript
* const control = new FormControl('some value', Validators.requiredTrue);
*
* console.log(control.errors); // {required: true}
* ```
*
* @returns An error map that contains the `required` property
* set to `true` if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static requiredTrue(control) {
return requiredTrueValidator(control);
}
/**
* @description
* Validator that requires the control's value pass an email validation test.
*
* Tests the value using a [regular
* expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions)
* pattern suitable for common use cases. The pattern is based on the definition of a valid email
* address in the [WHATWG HTML
* specification](https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address) with
* some enhancements to incorporate more RFC rules (such as rules related to domain names and the
* lengths of different parts of the address).
*
* The differences from the WHATWG version include:
* - Disallow `local-part` (the part before the `@` symbol) to begin or end with a period (`.`).
* - Disallow `local-part` to be longer than 64 characters.
* - Disallow the whole address to be longer than 254 characters.
*
* If this pattern does not satisfy your business needs, you can use `Validators.pattern()` to
* validate the value against a different pattern.
*
* @usageNotes
*
* ### Validate that the field matches a valid email pattern
*
* ```typescript
* const control = new FormControl('bad@', Validators.email);
*
* console.log(control.errors); // {email: true}
* ```
*
* @returns An error map with the `email` property
* if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static email(control) {
return emailValidator(control);
}
/**
* @description
* Validator that requires the length of the control's value to be greater than or equal
* to the provided minimum length. This validator is also provided by default if you use the
* the HTML5 `minlength` attribute. Note that the `minLength` validator is intended to be used
* only for types that have a numeric `length` property, such as strings or arrays. The
* `minLength` validator logic is also not invoked for values when their `length` property is 0
* (for example in case of an empty string or an empty array), to support optional controls. You
* can use the standard `required` validator if empty values should not be considered valid.
*
* @usageNotes
*
* ### Validate that the field has a minimum of 3 characters
*
* ```typescript
* const control = new FormControl('ng', Validators.minLength(3));
*
* console.log(control.errors); // {minlength: {requiredLength: 3, actualLength: 2}}
* ```
*
* ```html
* <input minlength="5">
* ```
*
* @returns A validator function that returns an error map with the
* `minlength` property if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static minLength(minLength) {
return minLengthValidator(minLength);
}
/**
* @description
* Validator that requires the length of the control's value to be less than or equal
* to the provided maximum length. This validator is also provided by default if you use the
* the HTML5 `maxlength` attribute. Note that the `maxLength` validator is intended to be used
* only for types that have a numeric `length` property, such as strings or arrays.
*
* @usageNotes
*
* ### Validate that the field has maximum of 5 characters
*
* ```typescript
* const control = new FormControl('Angular', Validators.maxLength(5));
*
* console.log(control.errors); // {maxlength: {requiredLength: 5, actualLength: 7}}
* ```
*
* ```html
* <input maxlength="5">
* ```
*
* @returns A validator function that returns an error map with the
* `maxlength` property if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static maxLength(maxLength) {
return maxLengthValidator(maxLength);
}
/**
* @description
* Validator that requires the control's value to match a regex pattern. This validator is also
* provided by default if you use the HTML5 `pattern` attribute.
*
* @usageNotes
*
* ### Validate that the field only contains letters or spaces
*
* ```typescript
* const control = new FormControl('1', Validators.pattern('[a-zA-Z ]*'));
*
* console.log(control.errors); // {pattern: {requiredPattern: '^[a-zA-Z ]*$', actualValue: '1'}}
* ```
*
* ```html
* <input pattern="[a-zA-Z ]*">
* ```
*
* ### Pattern matching with the global or sticky flag
*
* `RegExp` objects created with the `g` or `y` flags that are passed into `Validators.pattern`
* can produce different results on the same input when validations are run consecutively. This is
* due to how the behavior of `RegExp.prototype.test` is
* specified in [ECMA-262](https://tc39.es/ecma262/#sec-regexpbuiltinexec)
* (`RegExp` preserves the index of the last match when the global or sticky flag is used).
* Due to this behavior, it is recommended that when using
* `Validators.pattern` you **do not** pass in a `RegExp` object with either the global or sticky
* flag enabled.
*
* ```typescript
* // Not recommended (since the `g` flag is used)
* const controlOne = new FormControl('1', Validators.pattern(/foo/g));
*
* // Good
* const controlTwo = new FormControl('1', Validators.pattern(/foo/));
* ```
*
* @param pattern A regular expression to be used as is to test the values, or a string.
* If a string is passed, the `^` character is prepended and the `$` character is
* appended to the provided string (if not already present), and the resulting regular
* expression is used to test the values.
*
* @returns A validator function that returns an error map with the
* `pattern` property if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static pattern(pattern) {
return patternValidator(pattern);
}
/**
* @description
* Validator that performs no operation.
*
* @see `updateValueAndValidity()`
*
*/
static nullValidator(control) {
return nullValidator(control);
}
static compose(validators) {
return compose(validators);
}
/**
* @description
* Compose multiple async validators into a single function that returns the union
* of the individual error objects for the provided control.
*
* @returns A validator function that returns an error map with the
* merged error objects of the async validators if the validation check fails, otherwise `null`.
*
* @see `updateValueAndValidity()`
*
*/
static composeAsync(validators) {
return composeAsync(validators);
}
}
/**
* Validator that requires the control's value to be greater than or equal to the provided number.
* See `Validators.min` for additional information.
*/
export function minValidator(min) {
return (control) => {
if (isEmptyInputValue(control.value) || isEmptyInputValue(min)) {
return null; // don't validate empty values to allow optional controls
}
const value = parseFloat(control.value);
// Controls with NaN values after parsing should be treated as not having a
// minimum, per the HTML forms spec: https://www.w3.org/TR/html5/forms.html#attr-input-min
return !isNaN(value) && value < min ? { 'min': { 'min': min, 'actual': control.value } } : null;
};
}
/**
* Validator that requires the control's value to be less than or equal to the provided number.
* See `Validators.max` for additional information.
*/
export function maxValidator(max) {
return (control) => {
if (isEmptyInputValue(control.value) || isEmptyInputValue(max)) {
return null; // don't validate empty values to allow optional controls
}
const value = parseFloat(control.value);
// Controls with NaN values after parsing should be treated as not having a
// maximum, per the HTML forms spec: https://www.w3.org/TR/html5/forms.html#attr-input-max
return !isNaN(value) && value > max ? { 'max': { 'max': max, 'actual': control.value } } : null;
};
}
/**
* Validator that requires the control have a non-empty value.
* See `Validators.required` for additional information.
*/
export function requiredValidator(control) {
return isEmptyInputValue(control.value) ? { 'required': true } : null;
}
/**
* Validator that requires the control's value be true. This validator is commonly
* used for required checkboxes.
* See `Validators.requiredTrue` for additional information.
*/
export function requiredTrueValidator(control) {
return control.value === true ? null : { 'required': true };
}
/**
* Validator that requires the control's value pass an email validation test.
* See `Validators.email` for additional information.
*/
export function emailValidator(control) {
if (isEmptyInputValue(control.value)) {
return null; // don't validate empty values to allow optional controls
}
return EMAIL_REGEXP.test(control.value) ? null : { 'email': true };
}
/**
* Validator that requires the length of the control's value to be greater than or equal
* to the provided minimum length. See `Validators.minLength` for additional information.
*/
export function minLengthValidator(minLength) {
return (control) => {
if (isEmptyInputValue(control.value) || !hasValidLength(control.value)) {
// don't validate empty values to allow optional controls
// don't validate values without `length` property
return null;
}
return control.value.length < minLength ?
{ 'minlength': { 'requiredLength': minLength, 'actualLength': control.value.length } } :
null;
};
}
/**
* Validator that requires the length of the control's value to be less than or equal
* to the provided maximum length. See `Validators.maxLength` for additional information.
*/
export function maxLengthValidator(maxLength) {
return (control) => {
return hasValidLength(control.value) && control.value.length > maxLength ?
{ 'maxlength': { 'requiredLength': maxLength, 'actualLength': control.value.length } } :
null;
};
}
/**
* Validator that requires the control's value to match a regex pattern.
* See `Validators.pattern` for additional information.
*/
export function patternValidator(pattern) {
if (!pattern)
return nullValidator;
let regex;
let regexStr;
if (typeof pattern === 'string') {
regexStr = '';
if (pattern.charAt(0) !== '^')
regexStr += '^';
regexStr += pattern;
if (pattern.charAt(pattern.length - 1) !== '$')
regexStr += '$';
regex = new RegExp(regexStr);
}
else {
regexStr = pattern.toString();
regex = pattern;
}
return (control) => {
if (isEmptyInputValue(control.value)) {
return null; // don't validate empty values to allow optional controls
}
const value = control.value;
return regex.test(value) ? null :
{ 'pattern': { 'requiredPattern': regexStr, 'actualValue': value } };
};
}
/**
* Function that has `ValidatorFn` shape, but performs no operation.
*/
export function nullValidator(control) {
return null;
}
function isPresent(o) {
return o != null;
}
export function toObservable(value) {
const obs = isPromise(value) ? from(value) : value;
if (NG_DEV_MODE && !(isObservable(obs))) {
let errorMessage = `Expected async validator to return Promise or Observable.`;
// A synchronous validator will return object or null.
if (typeof value === 'object') {
errorMessage +=
' Are you using a synchronous validator where an async validator is expected?';
}
throw new RuntimeError(-1101 /* RuntimeErrorCode.WRONG_VALIDATOR_RETURN_TYPE */, errorMessage);
}
return obs;
}
function mergeErrors(arrayOfErrors) {
let res = {};
arrayOfErrors.forEach((errors) => {
res = errors != null ? { ...res, ...errors } : res;
});
return Object.keys(res).length === 0 ? null : res;
}
function executeValidators(control, validators) {
return validators.map(validator => validator(control));
}
function isValidatorFn(validator) {
return !validator.validate;
}
/**
* Given the list of validators that may contain both functions as well as classes, return the list
* of validator functions (convert validator classes into validator functions). This is needed to
* have consistent structure in validators list before composing them.
*
* @param validators The set of validators that may contain validators both in plain function form
* as well as represented as a validator class.
*/
export function normalizeValidators(validators) {
return validators.map(validator => {
return isValidatorFn(validator) ?
validator :
((c) => validator.validate(c));
});
}
/**
* Merges synchronous validators into a single validator function.
* See `Validators.compose` for additional information.
*/
function compose(validators) {
if (!validators)
return null;
const presentValidators = validators.filter(isPresent);
if (presentValidators.length == 0)
return null;
return function (control) {
return mergeErrors(executeValidators(control, presentValidators));
};
}
/**
* Accepts a list of validators of different possible shapes (`Validator` and `ValidatorFn`),
* normalizes the list (converts everything to `ValidatorFn`) and merges them into a single
* validator function.
*/
export function composeValidators(validators) {
return validators != null ? compose(normalizeValidators(validators)) : null;
}
/**
* Merges asynchronous validators into a single validator function.
* See `Validators.composeAsync` for additional information.
*/
function composeAsync(validators) {
if (!validators)
return null;
const presentValidators = validators.filter(isPresent);
if (presentValidators.length == 0)
return null;
return function (control) {
const observables = executeValidators(control, presentValidators).map(toObservable);
return forkJoin(observables).pipe(map(mergeErrors));
};
}
/**
* Accepts a list of async validators of different possible shapes (`AsyncValidator` and
* `AsyncValidatorFn`), normalizes the list (converts everything to `AsyncValidatorFn`) and merges
* them into a single validator function.
*/
export function composeAsyncValidators(validators) {
return validators != null ? composeAsync(normalizeValidators(validators)) :
null;
}
/**
* Merges raw control validators with a given directive validator and returns the combined list of
* validators as an array.
*/
export function mergeValidators(controlValidators, dirValidator) {
if (controlValidators === null)
return [dirValidator];
return Array.isArray(controlValidators) ? [...controlValidators, dirValidator] :
[controlValidators, dirValidator];
}
/**
* Retrieves the list of raw synchronous validators attached to a given control.
*/
export function getControlValidators(control) {
return control._rawValidators;
}
/**
* Retrieves the list of raw asynchronous validators attached to a given control.
*/
export function getControlAsyncValidators(control) {
return control._rawAsyncValidators;
}
/**
* Accepts a singleton validator, an array, or null, and returns an array type with the provided
* validators.
*
* @param validators A validator, validators, or null.
* @returns A validators array.
*/
export function makeValidatorsArray(validators) {
if (!validators)
return [];
return Array.isArray(validators) ? validators : [validators];
}
/**
* Determines whether a validator or validators array has a given validator.
*
* @param validators The validator or validators to compare against.
* @param validator The validator to check.
* @returns Whether the validator is present.
*/
export function hasValidator(validators, validator) {
return Array.isArray(validators) ? validators.includes(validator) : validators === validator;
}
/**
* Combines two arrays of validators into one. If duplicates are provided, only one will be added.
*
* @param validators The new validators.
* @param currentValidators The base array of current validators.
* @returns An array of validators.
*/
export function addValidators(validators, currentValidators) {
const current = makeValidatorsArray(currentValidators);
const validatorsToAdd = makeValidatorsArray(validators);
validatorsToAdd.forEach((v) => {
// Note: if there are duplicate entries in the new validators array,
// only the first one would be added to the current list of validators.
// Duplicate ones would be ignored since `hasValidator` would detect
// the presence of a validator function and we update the current list in place.
if (!hasValidator(current, v)) {
current.push(v);
}
});
return current;
}
export function removeValidators(validators, currentValidators) {
return makeValidatorsArray(currentValidators).filter(v => !hasValidator(validators, v));
}
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {InjectionToken, ɵisObservable as isObservable, ɵisPromise as isPromise, ɵRuntimeError as RuntimeError} from '@angular/core';\nimport {forkJoin, from, Observable} from 'rxjs';\nimport {map} from 'rxjs/operators';\n\nimport {AsyncValidator, AsyncValidatorFn, ValidationErrors, Validator, ValidatorFn} from './directives/validators';\nimport {RuntimeErrorCode} from './errors';\nimport {AbstractControl} from './model/abstract_model';\n\nconst NG_DEV_MODE = typeof ngDevMode === 'undefined' || !!ngDevMode;\n\nfunction isEmptyInputValue(value: any): boolean {\n  /**\n   * Check if the object is a string or array before evaluating the length attribute.\n   * This avoids falsely rejecting objects that contain a custom length attribute.\n   * For example, the object {id: 1, length: 0, width: 0} should not be returned as empty.\n   */\n  return value == null ||\n      ((typeof value === 'string' || Array.isArray(value)) && value.length === 0);\n}\n\nfunction hasValidLength(value: any): boolean {\n  // non-strict comparison is intentional, to check for both `null` and `undefined` values\n  return value != null && typeof value.length === 'number';\n}\n\n/**\n * @description\n * An `InjectionToken` for registering additional synchronous validators used with\n * `AbstractControl`s.\n *\n * @see `NG_ASYNC_VALIDATORS`\n *\n * @usageNotes\n *\n * ### Providing a custom validator\n *\n * The following example registers a custom validator directive. Adding the validator to the\n * existing collection of validators requires the `multi: true` option.\n *\n * ```typescript\n * @Directive({\n *   selector: '[customValidator]',\n *   providers: [{provide: NG_VALIDATORS, useExisting: CustomValidatorDirective, multi: true}]\n * })\n * class CustomValidatorDirective implements Validator {\n *   validate(control: AbstractControl): ValidationErrors | null {\n *     return { 'custom': true };\n *   }\n * }\n * ```\n *\n * @publicApi\n */\nexport const NG_VALIDATORS = new InjectionToken<Array<Validator|Function>>('NgValidators');\n\n/**\n * @description\n * An `InjectionToken` for registering additional asynchronous validators used with\n * `AbstractControl`s.\n *\n * @see `NG_VALIDATORS`\n *\n * @usageNotes\n *\n * ### Provide a custom async validator directive\n *\n * The following example implements the `AsyncValidator` interface to create an\n * async validator directive with a custom error key.\n *\n * ```typescript\n * @Directive({\n *   selector: '[customAsyncValidator]',\n *   providers: [{provide: NG_ASYNC_VALIDATORS, useExisting: CustomAsyncValidatorDirective, multi:\n * true}]\n * })\n * class CustomAsyncValidatorDirective implements AsyncValidator {\n *   validate(control: AbstractControl): Promise<ValidationErrors|null> {\n *     return Promise.resolve({'custom': true});\n *   }\n * }\n * ```\n *\n * @publicApi\n */\nexport const NG_ASYNC_VALIDATORS =\n    new InjectionToken<Array<Validator|Function>>('NgAsyncValidators');\n\n/**\n * A regular expression that matches valid e-mail addresses.\n *\n * At a high level, this regexp matches e-mail addresses of the format `local-part@tld`, where:\n * - `local-part` consists of one or more of the allowed characters (alphanumeric and some\n *   punctuation symbols).\n * - `local-part` cannot begin or end with a period (`.`).\n * - `local-part` cannot be longer than 64 characters.\n * - `tld` consists of one or more `labels` separated by periods (`.`). For example `localhost` or\n *   `foo.com`.\n * - A `label` consists of one or more of the allowed characters (alphanumeric, dashes (`-`) and\n *   periods (`.`)).\n * - A `label` cannot begin or end with a dash (`-`) or a period (`.`).\n * - A `label` cannot be longer than 63 characters.\n * - The whole address cannot be longer than 254 characters.\n *\n * ## Implementation background\n *\n * This regexp was ported over from AngularJS (see there for git history):\n * https://github.com/angular/angular.js/blob/c133ef836/src/ng/directive/input.js#L27\n * It is based on the\n * [WHATWG version](https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address) with\n * some enhancements to incorporate more RFC rules (such as rules related to domain names and the\n * lengths of different parts of the address). The main differences from the WHATWG version are:\n *   - Disallow `local-part` to begin or end with a period (`.`).\n *   - Disallow `local-part` length to exceed 64 characters.\n *   - Disallow total address length to exceed 254 characters.\n *\n * See [this commit](https://github.com/angular/angular.js/commit/f3f5cf72e) for more details.\n */\nconst EMAIL_REGEXP =\n    /^(?=.{1,254}$)(?=.{1,64}@)[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;\n\n/**\n * @description\n * Provides a set of built-in validators that can be used by form controls.\n *\n * A validator is a function that processes a `FormControl` or collection of\n * controls and returns an error map or null. A null map means that validation has passed.\n *\n * @see [Form Validation](/guide/form-validation)\n *\n * @publicApi\n */\nexport class Validators {\n  /**\n   * @description\n   * Validator that requires the control's value to be greater than or equal to the provided number.\n   *\n   * @usageNotes\n   *\n   * ### Validate against a minimum of 3\n   *\n   * ```typescript\n   * const control = new FormControl(2, Validators.min(3));\n   *\n   * console.log(control.errors); // {min: {min: 3, actual: 2}}\n   * ```\n   *\n   * @returns A validator function that returns an error map with the\n   * `min` property if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static min(min: number): ValidatorFn {\n    return minValidator(min);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control's value to be less than or equal to the provided number.\n   *\n   * @usageNotes\n   *\n   * ### Validate against a maximum of 15\n   *\n   * ```typescript\n   * const control = new FormControl(16, Validators.max(15));\n   *\n   * console.log(control.errors); // {max: {max: 15, actual: 16}}\n   * ```\n   *\n   * @returns A validator function that returns an error map with the\n   * `max` property if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static max(max: number): ValidatorFn {\n    return maxValidator(max);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control have a non-empty value.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field is non-empty\n   *\n   * ```typescript\n   * const control = new FormControl('', Validators.required);\n   *\n   * console.log(control.errors); // {required: true}\n   * ```\n   *\n   * @returns An error map with the `required` property\n   * if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static required(control: AbstractControl): ValidationErrors|null {\n    return requiredValidator(control);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control's value be true. This validator is commonly\n   * used for required checkboxes.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field value is true\n   *\n   * ```typescript\n   * const control = new FormControl('some value', Validators.requiredTrue);\n   *\n   * console.log(control.errors); // {required: true}\n   * ```\n   *\n   * @returns An error map that contains the `required` property\n   * set to `true` if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static requiredTrue(control: AbstractControl): ValidationErrors|null {\n    return requiredTrueValidator(control);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control's value pass an email validation test.\n   *\n   * Tests the value using a [regular\n   * expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions)\n   * pattern suitable for common use cases. The pattern is based on the definition of a valid email\n   * address in the [WHATWG HTML\n   * specification](https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address) with\n   * some enhancements to incorporate more RFC rules (such as rules related to domain names and the\n   * lengths of different parts of the address).\n   *\n   * The differences from the WHATWG version include:\n   * - Disallow `local-part` (the part before the `@` symbol) to begin or end with a period (`.`).\n   * - Disallow `local-part` to be longer than 64 characters.\n   * - Disallow the whole address to be longer than 254 characters.\n   *\n   * If this pattern does not satisfy your business needs, you can use `Validators.pattern()` to\n   * validate the value against a different pattern.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field matches a valid email pattern\n   *\n   * ```typescript\n   * const control = new FormControl('bad@', Valida