/**
 * @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 { EventEmitter } from '@angular/core';
import { removeListItem } from './directives/shared';
import { addValidators, composeAsyncValidators, composeValidators, hasValidator, removeValidators, toObservable } from './validators';
/**
 * Reports that a FormControl is valid, meaning that no errors exist in the input value.
 *
 * @see `status`
 */
export const VALID = 'VALID';
/**
 * Reports that a FormControl is invalid, meaning that an error exists in the input value.
 *
 * @see `status`
 */
export const INVALID = 'INVALID';
/**
 * Reports that a FormControl is pending, meaning that that async validation is occurring and
 * errors are not yet available for the input value.
 *
 * @see `markAsPending`
 * @see `status`
 */
export const PENDING = 'PENDING';
/**
 * Reports that a FormControl is disabled, meaning that the control is exempt from ancestor
 * calculations of validity or value.
 *
 * @see `markAsDisabled`
 * @see `status`
 */
export const DISABLED = 'DISABLED';
function _find(control, path, delimiter) {
    if (path == null)
        return null;
    if (!Array.isArray(path)) {
        path = path.split(delimiter);
    }
    if (Array.isArray(path) && path.length === 0)
        return null;
    // Not using Array.reduce here due to a Chrome 80 bug
    // https://bugs.chromium.org/p/chromium/issues/detail?id=1049982
    let controlToFind = control;
    path.forEach((name) => {
        if (controlToFind instanceof FormGroup) {
            controlToFind = controlToFind.controls.hasOwnProperty(name) ?
                controlToFind.controls[name] :
                null;
        }
        else if (controlToFind instanceof FormArray) {
            controlToFind = controlToFind.at(name) || null;
        }
        else {
            controlToFind = null;
        }
    });
    return controlToFind;
}
/**
 * Gets validators from either an options object or given validators.
 */
function pickValidators(validatorOrOpts) {
    return (isOptionsObj(validatorOrOpts) ? validatorOrOpts.validators : validatorOrOpts) || null;
}
/**
 * Creates validator function by combining provided validators.
 */
function coerceToValidator(validator) {
    return Array.isArray(validator) ? composeValidators(validator) : validator || null;
}
/**
 * Gets async validators from either an options object or given validators.
 */
function pickAsyncValidators(asyncValidator, validatorOrOpts) {
    return (isOptionsObj(validatorOrOpts) ? validatorOrOpts.asyncValidators : asyncValidator) || null;
}
/**
 * Creates async validator function by combining provided async validators.
 */
function coerceToAsyncValidator(asyncValidator) {
    return Array.isArray(asyncValidator) ? composeAsyncValidators(asyncValidator) :
        asyncValidator || null;
}
function isOptionsObj(validatorOrOpts) {
    return validatorOrOpts != null && !Array.isArray(validatorOrOpts) &&
        typeof validatorOrOpts === 'object';
}
/**
 * This is the base class for `FormControl`, `FormGroup`, and `FormArray`.
 *
 * It provides some of the shared behavior that all controls and groups of controls have, like
 * running validators, calculating status, and resetting state. It also defines the properties
 * that are shared between all sub-classes, like `value`, `valid`, and `dirty`. It shouldn't be
 * instantiated directly.
 *
 * @see [Forms Guide](/guide/forms)
 * @see [Reactive Forms Guide](/guide/reactive-forms)
 * @see [Dynamic Forms Guide](/guide/dynamic-form)
 *
 * @publicApi
 */
export class AbstractControl {
    /**
     * Initialize the AbstractControl instance.
     *
     * @param validators The function or array of functions that is used to determine the validity of
     *     this control synchronously.
     * @param asyncValidators The function or array of functions that is used to determine validity of
     *     this control asynchronously.
     */
    constructor(validators, asyncValidators) {
        /**
         * Indicates that a control has its own pending asynchronous validation in progress.
         *
         * @internal
         */
        this._hasOwnPendingAsyncValidator = false;
        /** @internal */
        this._onCollectionChange = () => { };
        this._parent = null;
        /**
         * A control is `pristine` if the user has not yet changed
         * the value in the UI.
         *
         * @returns True if the user has not yet changed the value in the UI; compare `dirty`.
         * Programmatic changes to a control's value do not mark it dirty.
         */
        this.pristine = true;
        /**
         * True if the control is marked as `touched`.
         *
         * A control is marked `touched` once the user has triggered
         * a `blur` event on it.
         */
        this.touched = false;
        /** @internal */
        this._onDisabledChange = [];
        this._rawValidators = validators;
        this._rawAsyncValidators = asyncValidators;
        this._composedValidatorFn = coerceToValidator(this._rawValidators);
        this._composedAsyncValidatorFn = coerceToAsyncValidator(this._rawAsyncValidators);
    }
    /**
     * Returns the function that is used to determine the validity of this control synchronously.
     * If multiple validators have been added, this will be a single composed function.
     * See `Validators.compose()` for additional information.
     */
    get validator() {
        return this._composedValidatorFn;
    }
    set validator(validatorFn) {
        this._rawValidators = this._composedValidatorFn = validatorFn;
    }
    /**
     * Returns the function that is used to determine the validity of this control asynchronously.
     * If multiple validators have been added, this will be a single composed function.
     * See `Validators.compose()` for additional information.
     */
    get asyncValidator() {
        return this._composedAsyncValidatorFn;
    }
    set asyncValidator(asyncValidatorFn) {
        this._rawAsyncValidators = this._composedAsyncValidatorFn = asyncValidatorFn;
    }
    /**
     * The parent control.
     */
    get parent() {
        return this._parent;
    }
    /**
     * A control is `valid` when its `status` is `VALID`.
     *
     * @see {@link AbstractControl.status}
     *
     * @returns True if the control has passed all of its validation tests,
     * false otherwise.
     */
    get valid() {
        return this.status === VALID;
    }
    /**
     * A control is `invalid` when its `status` is `INVALID`.
     *
     * @see {@link AbstractControl.status}
     *
     * @returns True if this control has failed one or more of its validation checks,
     * false otherwise.
     */
    get invalid() {
        return this.status === INVALID;
    }
    /**
     * A control is `pending` when its `status` is `PENDING`.
     *
     * @see {@link AbstractControl.status}
     *
     * @returns True if this control is in the process of conducting a validation check,
     * false otherwise.
     */
    get pending() {
        return this.status == PENDING;
    }
    /**
     * A control is `disabled` when its `status` is `DISABLED`.
     *
     * Disabled controls are exempt from validation checks and
     * are not included in the aggregate value of their ancestor
     * controls.
     *
     * @see {@link AbstractControl.status}
     *
     * @returns True if the control is disabled, false otherwise.
     */
    get disabled() {
        return this.status === DISABLED;
    }
    /**
     * A control is `enabled` as long as its `status` is not `DISABLED`.
     *
     * @returns True if the control has any status other than 'DISABLED',
     * false if the status is 'DISABLED'.
     *
     * @see {@link AbstractControl.status}
     *
     */
    get enabled() {
        return this.status !== DISABLED;
    }
    /**
     * A control is `dirty` if the user has changed the value
     * in the UI.
     *
     * @returns True if the user has changed the value of this control in the UI; compare `pristine`.
     * Programmatic changes to a control's value do not mark it dirty.
     */
    get dirty() {
        return !this.pristine;
    }
    /**
     * True if the control has not been marked as touched
     *
     * A control is `untouched` if the user has not yet triggered
     * a `blur` event on it.
     */
    get untouched() {
        return !this.touched;
    }
    /**
     * Reports the update strategy of the `AbstractControl` (meaning
     * the event on which the control updates itself).
     * Possible values: `'change'` | `'blur'` | `'submit'`
     * Default value: `'change'`
     */
    get updateOn() {
        return this._updateOn ? this._updateOn : (this.parent ? this.parent.updateOn : 'change');
    }
    /**
     * Sets the synchronous validators that are active on this control.  Calling
     * this overwrites any existing synchronous validators.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     * If you want to add a new validator without affecting existing ones, consider
     * using `addValidators()` method instead.
     */
    setValidators(validators) {
        this._rawValidators = validators;
        this._composedValidatorFn = coerceToValidator(validators);
    }
    /**
     * Sets the asynchronous validators that are active on this control. Calling this
     * overwrites any existing asynchronous validators.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     * If you want to add a new validator without affecting existing ones, consider
     * using `addAsyncValidators()` method instead.
     */
    setAsyncValidators(validators) {
        this._rawAsyncValidators = validators;
        this._composedAsyncValidatorFn = coerceToAsyncValidator(validators);
    }
    /**
     * Add a synchronous validator or validators to this control, without affecting other validators.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     * Adding a validator that already exists will have no effect. If duplicate validator functions
     * are present in the `validators` array, only the first instance would be added to a form
     * control.
     *
     * @param validators The new validator function or functions to add to this control.
     */
    addValidators(validators) {
        this.setValidators(addValidators(validators, this._rawValidators));
    }
    /**
     * Add an asynchronous validator or validators to this control, without affecting other
     * validators.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     * Adding a validator that already exists will have no effect.
     *
     * @param validators The new asynchronous validator function or functions to add to this control.
     */
    addAsyncValidators(validators) {
        this.setAsyncValidators(addValidators(validators, this._rawAsyncValidators));
    }
    /**
     * Remove a synchronous validator from this control, without affecting other validators.
     * Validators are compared by function reference; you must pass a reference to the exact same
     * validator function as the one that was originally set. If a provided validator is not found,
     * it is ignored.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     * @param validators The validator or validators to remove.
     */
    removeValidators(validators) {
        this.setValidators(removeValidators(validators, this._rawValidators));
    }
    /**
     * Remove an asynchronous validator from this control, without affecting other validators.
     * Validators are compared by function reference; you must pass a reference to the exact same
     * validator function as the one that was originally set. If a provided validator is not found, it
     * is ignored.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     * @param validators The asynchronous validator or validators to remove.
     */
    removeAsyncValidators(validators) {
        this.setAsyncValidators(removeValidators(validators, this._rawAsyncValidators));
    }
    /**
     * Check whether a synchronous validator function is present on this control. The provided
     * validator must be a reference to the exact same function that was provided.
     *
     * @param validator The validator to check for presence. Compared by function reference.
     * @returns Whether the provided validator was found on this control.
     */
    hasValidator(validator) {
        return hasValidator(this._rawValidators, validator);
    }
    /**
     * Check whether an asynchronous validator function is present on this control. The provided
     * validator must be a reference to the exact same function that was provided.
     *
     * @param validator The asynchronous validator to check for presence. Compared by function
     *     reference.
     * @returns Whether the provided asynchronous validator was found on this control.
     */
    hasAsyncValidator(validator) {
        return hasValidator(this._rawAsyncValidators, validator);
    }
    /**
     * Empties out the synchronous validator list.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     */
    clearValidators() {
        this.validator = null;
    }
    /**
     * Empties out the async validator list.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     */
    clearAsyncValidators() {
        this.asyncValidator = null;
    }
    /**
     * Marks the control as `touched`. A control is touched by focus and
     * blur events that do not change the value.
     *
     * @see `markAsUntouched()`
     * @see `markAsDirty()`
     * @see `markAsPristine()`
     *
     * @param opts Configuration options that determine how the control propagates changes
     * and emits events after marking is applied.
     * * `onlySelf`: When true, mark only this control. When false or not supplied,
     * marks all direct ancestors. Default is false.
     */
    markAsTouched(opts = {}) {
        this.touched = true;
        if (this._parent && !opts.onlySelf) {
            this._parent.markAsTouched(opts);
        }
    }
    /**
     * Marks the control and all its descendant controls as `touched`.
     * @see `markAsTouched()`
     */
    markAllAsTouched() {
        this.markAsTouched({ onlySelf: true });
        this._forEachChild((control) => control.markAllAsTouched());
    }
    /**
     * Marks the control as `untouched`.
     *
     * If the control has any children, also marks all children as `untouched`
     * and recalculates the `touched` status of all parent controls.
     *
     * @see `markAsTouched()`
     * @see `markAsDirty()`
     * @see `markAsPristine()`
     *
     * @param opts Configuration options that determine how the control propagates changes
     * and emits events after the marking is applied.
     * * `onlySelf`: When true, mark only this control. When false or not supplied,
     * marks all direct ancestors. Default is false.
     */
    markAsUntouched(opts = {}) {
        this.touched = false;
        this._pendingTouched = false;
        this._forEachChild((control) => {
            control.markAsUntouched({ onlySelf: true });
        });
        if (this._parent && !opts.onlySelf) {
            this._parent._updateTouched(opts);
        }
    }
    /**
     * Marks the control as `dirty`. A control becomes dirty when
     * the control's value is changed through the UI; compare `markAsTouched`.
     *
     * @see `markAsTouched()`
     * @see `markAsUntouched()`
     * @see `markAsPristine()`
     *
     * @param opts Configuration options that determine how the control propagates changes
     * and emits events after marking is applied.
     * * `onlySelf`: When true, mark only this control. When false or not supplied,
     * marks all direct ancestors. Default is false.
     */
    markAsDirty(opts = {}) {
        this.pristine = false;
        if (this._parent && !opts.onlySelf) {
            this._parent.markAsDirty(opts);
        }
    }
    /**
     * Marks the control as `pristine`.
     *
     * If the control has any children, marks all children as `pristine`,
     * and recalculates the `pristine` status of all parent
     * controls.
     *
     * @see `markAsTouched()`
     * @see `markAsUntouched()`
     * @see `markAsDirty()`
     *
     * @param opts Configuration options that determine how the control emits events after
     * marking is applied.
     * * `onlySelf`: When true, mark only this control. When false or not supplied,
     * marks all direct ancestors. Default is false.
     */
    markAsPristine(opts = {}) {
        this.pristine = true;
        this._pendingDirty = false;
        this._forEachChild((control) => {
            control.markAsPristine({ onlySelf: true });
        });
        if (this._parent && !opts.onlySelf) {
            this._parent._updatePristine(opts);
        }
    }
    /**
     * Marks the control as `pending`.
     *
     * A control is pending while the control performs async validation.
     *
     * @see {@link AbstractControl.status}
     *
     * @param opts Configuration options that determine how the control propagates changes and
     * emits events after marking is applied.
     * * `onlySelf`: When true, mark only this control. When false or not supplied,
     * marks all direct ancestors. Default is false.
     * * `emitEvent`: When true or not supplied (the default), the `statusChanges`
     * observable emits an event with the latest status the control is marked pending.
     * When false, no events are emitted.
     *
     */
    markAsPending(opts = {}) {
        this.status = PENDING;
        if (opts.emitEvent !== false) {
            this.statusChanges.emit(this.status);
        }
        if (this._parent && !opts.onlySelf) {
            this._parent.markAsPending(opts);
        }
    }
    /**
     * Disables the control. This means the control is exempt from validation checks and
     * excluded from the aggregate value of any parent. Its status is `DISABLED`.
     *
     * If the control has children, all children are also disabled.
     *
     * @see {@link AbstractControl.status}
     *
     * @param opts Configuration options that determine how the control propagates
     * changes and emits events after the control is disabled.
     * * `onlySelf`: When true, mark only this control. When false or not supplied,
     * marks all direct ancestors. Default is false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control is disabled.
     * When false, no events are emitted.
     */
    disable(opts = {}) {
        // If parent has been marked artificially dirty we don't want to re-calculate the
        // parent's dirtiness based on the children.
        const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);
        this.status = DISABLED;
        this.errors = null;
        this._forEachChild((control) => {
            control.disable(Object.assign(Object.assign({}, opts), { onlySelf: true }));
        });
        this._updateValue();
        if (opts.emitEvent !== false) {
            this.valueChanges.emit(this.value);
            this.statusChanges.emit(this.status);
        }
        this._updateAncestors(Object.assign(Object.assign({}, opts), { skipPristineCheck }));
        this._onDisabledChange.forEach((changeFn) => changeFn(true));
    }
    /**
     * Enables the control. This means the control is included in validation checks and
     * the aggregate value of its parent. Its status recalculates based on its value and
     * its validators.
     *
     * By default, if the control has children, all children are enabled.
     *
     * @see {@link AbstractControl.status}
     *
     * @param opts Configure options that control how the control propagates changes and
     * emits events when marked as untouched
     * * `onlySelf`: When true, mark only this control. When false or not supplied,
     * marks all direct ancestors. Default is false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control is enabled.
     * When false, no events are emitted.
     */
    enable(opts = {}) {
        // If parent has been marked artificially dirty we don't want to re-calculate the
        // parent's dirtiness based on the children.
        const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);
        this.status = VALID;
        this._forEachChild((control) => {
            control.enable(Object.assign(Object.assign({}, opts), { onlySelf: true }));
        });
        this.updateValueAndValidity({ onlySelf: true, emitEvent: opts.emitEvent });
        this._updateAncestors(Object.assign(Object.assign({}, opts), { skipPristineCheck }));
        this._onDisabledChange.forEach((changeFn) => changeFn(false));
    }
    _updateAncestors(opts) {
        if (this._parent && !opts.onlySelf) {
            this._parent.updateValueAndValidity(opts);
            if (!opts.skipPristineCheck) {
                this._parent._updatePristine();
            }
            this._parent._updateTouched();
        }
    }
    /**
     * @param parent Sets the parent of the control
     */
    setParent(parent) {
        this._parent = parent;
    }
    /**
     * Recalculates the value and validation status of the control.
     *
     * By default, it also updates the value and validity of its ancestors.
     *
     * @param opts Configuration options determine how the control propagates changes and emits events
     * after updates and validity checks are applied.
     * * `onlySelf`: When true, only update this control. When false or not supplied,
     * update all direct ancestors. Default is false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control is updated.
     * When false, no events are emitted.
     */
    updateValueAndValidity(opts = {}) {
        this._setInitialStatus();
        this._updateValue();
        if (this.enabled) {
            this._cancelExistingSubscription();
            this.errors = this._runValidator();
            this.status = this._calculateStatus();
            if (this.status === VALID || this.status === PENDING) {
                this._runAsyncValidator(opts.emitEvent);
            }
        }
        if (opts.emitEvent !== false) {
            this.valueChanges.emit(this.value);
            this.statusChanges.emit(this.status);
        }
        if (this._parent && !opts.onlySelf) {
            this._parent.updateValueAndValidity(opts);
        }
    }
    /** @internal */
    _updateTreeValidity(opts = { emitEvent: true }) {
        this._forEachChild((ctrl) => ctrl._updateTreeValidity(opts));
        this.updateValueAndValidity({ onlySelf: true, emitEvent: opts.emitEvent });
    }
    _setInitialStatus() {
        this.status = this._allControlsDisabled() ? DISABLED : VALID;
    }
    _runValidator() {
        return this.validator ? this.validator(this) : null;
    }
    _runAsyncValidator(emitEvent) {
        if (this.asyncValidator) {
            this.status = PENDING;
            this._hasOwnPendingAsyncValidator = true;
            const obs = toObservable(this.asyncValidator(this));
            this._asyncValidationSubscription = obs.subscribe((errors) => {
                this._hasOwnPendingAsyncValidator = false;
                // This will trigger the recalculation of the validation status, which depends on
                // the state of the asynchronous validation (whether it is in progress or not). So, it is
                // necessary that we have updated the `_hasOwnPendingAsyncValidator` boolean flag first.
                this.setErrors(errors, { emitEvent });
            });
        }
    }
    _cancelExistingSubscription() {
        if (this._asyncValidationSubscription) {
            this._asyncValidationSubscription.unsubscribe();
            this._hasOwnPendingAsyncValidator = false;
        }
    }
    /**
     * Sets errors on a form control when running validations manually, rather than automatically.
     *
     * Calling `setErrors` also updates the validity of the parent control.
     *
     * @usageNotes
     *
     * ### Manually set the errors for a control
     *
     * ```
     * const login = new FormControl('someLogin');
     * login.setErrors({
     *   notUnique: true
     * });
     *
     * expect(login.valid).toEqual(false);
     * expect(login.errors).toEqual({ notUnique: true });
     *
     * login.setValue('someOtherLogin');
     *
     * expect(login.valid).toEqual(true);
     * ```
     */
    setErrors(errors, opts = {}) {
        this.errors = errors;
        this._updateControlsErrors(opts.emitEvent !== false);
    }
    /**
     * Retrieves a child control given the control's name or path.
     *
     * @param path A dot-delimited string or array of string/number values that define the path to the
     * control.
     *
     * @usageNotes
     * ### Retrieve a nested control
     *
     * For example, to get a `name` control nested within a `person` sub-group:
     *
     * * `this.form.get('person.name');`
     *
     * -OR-
     *
     * * `this.form.get(['person', 'name']);`
     *
     * ### Retrieve a control in a FormArray
     *
     * When accessing an element inside a FormArray, you can use an element index.
     * For example, to get a `price` control from the first element in an `items` array you can use:
     *
     * * `this.form.get('items.0.price');`
     *
     * -OR-
     *
     * * `this.form.get(['items', 0, 'price']);`
     */
    get(path) {
        return _find(this, path, '.');
    }
    /**
     * @description
     * Reports error data for the control with the given path.
     *
     * @param errorCode The code of the error to check
     * @param path A list of control names that designates how to move from the current control
     * to the control that should be queried for errors.
     *
     * @usageNotes
     * For example, for the following `FormGroup`:
     *
     * ```
     * form = new FormGroup({
     *   address: new FormGroup({ street: new FormControl() })
     * });
     * ```
     *
     * The path to the 'street' control from the root form would be 'address' -> 'street'.
     *
     * It can be provided to this method in one of two formats:
     *
     * 1. An array of string control names, e.g. `['address', 'street']`
     * 1. A period-delimited list of control names in one string, e.g. `'address.street'`
     *
     * @returns error data for that particular error. If the control or error is not present,
     * null is returned.
     */
    getError(errorCode, path) {
        const control = path ? this.get(path) : this;
        return control && control.errors ? control.errors[errorCode] : null;
    }
    /**
     * @description
     * Reports whether the control with the given path has the error specified.
     *
     * @param errorCode The code of the error to check
     * @param path A list of control names that designates how to move from the current control
     * to the control that should be queried for errors.
     *
     * @usageNotes
     * For example, for the following `FormGroup`:
     *
     * ```
     * form = new FormGroup({
     *   address: new FormGroup({ street: new FormControl() })
     * });
     * ```
     *
     * The path to the 'street' control from the root form would be 'address' -> 'street'.
     *
     * It can be provided to this method in one of two formats:
     *
     * 1. An array of string control names, e.g. `['address', 'street']`
     * 1. A period-delimited list of control names in one string, e.g. `'address.street'`
     *
     * If no path is given, this method checks for the error on the current control.
     *
     * @returns whether the given error is present in the control at the given path.
     *
     * If the control is not present, false is returned.
     */
    hasError(errorCode, path) {
        return !!this.getError(errorCode, path);
    }
    /**
     * Retrieves the top-level ancestor of this control.
     */
    get root() {
        let x = this;
        while (x._parent) {
            x = x._parent;
        }
        return x;
    }
    /** @internal */
    _updateControlsErrors(emitEvent) {
        this.status = this._calculateStatus();
        if (emitEvent) {
            this.statusChanges.emit(this.status);
        }
        if (this._parent) {
            this._parent._updateControlsErrors(emitEvent);
        }
    }
    /** @internal */
    _initObservables() {
        this.valueChanges = new EventEmitter();
        this.statusChanges = new EventEmitter();
    }
    _calculateStatus() {
        if (this._allControlsDisabled())
            return DISABLED;
        if (this.errors)
            return INVALID;
        if (this._hasOwnPendingAsyncValidator || this._anyControlsHaveStatus(PENDING))
            return PENDING;
        if (this._anyControlsHaveStatus(INVALID))
            return INVALID;
        return VALID;
    }
    /** @internal */
    _anyControlsHaveStatus(status) {
        return this._anyControls((control) => control.status === status);
    }
    /** @internal */
    _anyControlsDirty() {
        return this._anyControls((control) => control.dirty);
    }
    /** @internal */
    _anyControlsTouched() {
        return this._anyControls((control) => control.touched);
    }
    /** @internal */
    _updatePristine(opts = {}) {
        this.pristine = !this._anyControlsDirty();
        if (this._parent && !opts.onlySelf) {
            this._parent._updatePristine(opts);
        }
    }
    /** @internal */
    _updateTouched(opts = {}) {
        this.touched = this._anyControlsTouched();
        if (this._parent && !opts.onlySelf) {
            this._parent._updateTouched(opts);
        }
    }
    /** @internal */
    _isBoxedValue(formState) {
        return typeof formState === 'object' && formState !== null &&
            Object.keys(formState).length === 2 && 'value' in formState && 'disabled' in formState;
    }
    /** @internal */
    _registerOnCollectionChange(fn) {
        this._onCollectionChange = fn;
    }
    /** @internal */
    _setUpdateStrategy(opts) {
        if (isOptionsObj(opts) && opts.updateOn != null) {
            this._updateOn = opts.updateOn;
        }
    }
    /**
     * Check to see if parent has been marked artificially dirty.
     *
     * @internal
     */
    _parentMarkedDirty(onlySelf) {
        const parentDirty = this._parent && this._parent.dirty;
        return !onlySelf && !!parentDirty && !this._parent._anyControlsDirty();
    }
}
/**
 * Tracks the value and validation status of an individual form control.
 *
 * This is one of the three fundamental building blocks of Angular forms, along with
 * `FormGroup` and `FormArray`. It extends the `AbstractControl` class that
 * implements most of the base functionality for accessing the value, validation status,
 * user interactions and events. See [usage examples below](#usage-notes).
 *
 * @see `AbstractControl`
 * @see [Reactive Forms Guide](guide/reactive-forms)
 * @see [Usage Notes](#usage-notes)
 *
 * @usageNotes
 *
 * ### Initializing Form Controls
 *
 * Instantiate a `FormControl`, with an initial value.
 *
 * ```ts
 * const control = new FormControl('some value');
 * console.log(control.value);     // 'some value'
 *```
 *
 * The following example initializes the control with a form state object. The `value`
 * and `disabled` keys are required in this case.
 *
 * ```ts
 * const control = new FormControl({ value: 'n/a', disabled: true });
 * console.log(control.value);     // 'n/a'
 * console.log(control.status);    // 'DISABLED'
 * ```
 *
 * The following example initializes the control with a synchronous validator.
 *
 * ```ts
 * const control = new FormControl('', Validators.required);
 * console.log(control.value);      // ''
 * console.log(control.status);     // 'INVALID'
 * ```
 *
 * The following example initializes the control using an options object.
 *
 * ```ts
 * const control = new FormControl('', {
 *    validators: Validators.required,
 *    asyncValidators: myAsyncValidator
 * });
 * ```
 *
 * ### Configure the control to update on a blur event
 *
 * Set the `updateOn` option to `'blur'` to update on the blur `event`.
 *
 * ```ts
 * const control = new FormControl('', { updateOn: 'blur' });
 * ```
 *
 * ### Configure the control to update on a submit event
 *
 * Set the `updateOn` option to `'submit'` to update on a submit `event`.
 *
 * ```ts
 * const control = new FormControl('', { updateOn: 'submit' });
 * ```
 *
 * ### Reset the control back to an initial value
 *
 * You reset to a specific form state by passing through a standalone
 * value or a form state object that contains both a value and a disabled state
 * (these are the only two properties that cannot be calculated).
 *
 * ```ts
 * const control = new FormControl('Nancy');
 *
 * console.log(control.value); // 'Nancy'
 *
 * control.reset('Drew');
 *
 * console.log(control.value); // 'Drew'
 * ```
 *
 * ### Reset the control back to an initial value and disabled
 *
 * ```
 * const control = new FormControl('Nancy');
 *
 * console.log(control.value); // 'Nancy'
 * console.log(control.status); // 'VALID'
 *
 * control.reset({ value: 'Drew', disabled: true });
 *
 * console.log(control.value); // 'Drew'
 * console.log(control.status); // 'DISABLED'
 * ```
 *
 * @publicApi
 */
export class FormControl extends AbstractControl {
    /**
     * Creates a new `FormControl` instance.
     *
     * @param formState Initializes the control with an initial value,
     * or an object that defines the initial value and disabled state.
     *
     * @param validatorOrOpts A synchronous validator function, or an array of
     * such functions, or an `AbstractControlOptions` object that contains validation functions
     * and a validation trigger.
     *
     * @param asyncValidator A single async validator or array of async validator functions
     *
     */
    constructor(formState = null, validatorOrOpts, asyncValidator) {
        super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));
        /** @internal */
        this._onChange = [];
        this._applyFormState(formState);
        this._setUpdateStrategy(validatorOrOpts);
        this._initObservables();
        this.updateValueAndValidity({
            onlySelf: true,
            // If `asyncValidator` is present, it will trigger control status change from `PENDING` to
            // `VALID` or `INVALID`.
            // The status should be broadcasted via the `statusChanges` observable, so we set `emitEvent`
            // to `true` to allow that during the control creation process.
            emitEvent: !!this.asyncValidator
        });
    }
    /**
     * Sets a new value for the form control.
     *
     * @param value The new value for the control.
     * @param options Configuration options that determine how the control propagates changes
     * and emits events when the value changes.
     * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
     * updateValueAndValidity} method.
     *
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
     * false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control value is updated.
     * When false, no events are emitted.
     * * `emitModelToViewChange`: When true or not supplied  (the default), each change triggers an
     * `onChange` event to
     * update the view.
     * * `emitViewToModelChange`: When true or not supplied (the default), each change triggers an
     * `ngModelChange`
     * event to update the model.
     *
     */
    setValue(value, options = {}) {
        this.value = this._pendingValue = value;
        if (this._onChange.length && options.emitModelToViewChange !== false) {
            this._onChange.forEach((changeFn) => changeFn(this.value, options.emitViewToModelChange !== false));
        }
        this.updateValueAndValidity(options);
    }
    /**
     * Patches the value of a control.
     *
     * This function is functionally the same as {@link FormControl#setValue setValue} at this level.
     * It exists for symmetry with {@link FormGroup#patchValue patchValue} on `FormGroups` and
     * `FormArrays`, where it does behave differently.
     *
     * @see `setValue` for options
     */
    patchValue(value, options = {}) {
        this.setValue(value, options);
    }
    /**
     * Resets the form control, marking it `pristine` and `untouched`, and setting
     * the value to null.
     *
     * @param formState Resets the control with an initial value,
     * or an object that defines the initial value and disabled state.
     *
     * @param options Configuration options that determine how the control propagates changes
     * and emits events after the value changes.
     *
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
     * false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control is reset.
     * When false, no events are emitted.
     *
     */
    reset(formState = null, options = {}) {
        this._applyFormState(formState);
        this.markAsPristine(options);
        this.markAsUntouched(options);
        this.setValue(this.value, options);
        this._pendingChange = false;
    }
    /**
     * @internal
     */
    _updateValue() { }
    /**
     * @internal
     */
    _anyControls(condition) {
        return false;
    }
    /**
     * @internal
     */
    _allControlsDisabled() {
        return this.disabled;
    }
    /**
     * Register a listener for change events.
     *
     * @param fn The method that is called when the value changes
     */
    registerOnChange(fn) {
        this._onChange.push(fn);
    }
    /**
     * Internal function to unregister a change events listener.
     * @internal
     */
    _unregisterOnChange(fn) {
        removeListItem(this._onChange, fn);
    }
    /**
     * Register a listener for disabled events.
     *
     * @param fn The method that is called when the disabled status changes.
     */
    registerOnDisabledChange(fn) {
        this._onDisabledChange.push(fn);
    }
    /**
     * Internal function to unregister a disabled event listener.
     * @internal
     */
    _unregisterOnDisabledChange(fn) {
        removeListItem(this._onDisabledChange, fn);
    }
    /**
     * @internal
     */
    _forEachChild(cb) { }
    /** @internal */
    _syncPendingControls() {
        if (this.updateOn === 'submit') {
            if (this._pendingDirty)
                this.markAsDirty();
            if (this._pendingTouched)
                this.markAsTouched();
            if (this._pendingChange) {
                this.setValue(this._pendingValue, { onlySelf: true, emitModelToViewChange: false });
                return true;
            }
        }
        return false;
    }
    _applyFormState(formState) {
        if (this._isBoxedValue(formState)) {
            this.value = this._pendingValue = formState.value;
            formState.disabled ? this.disable({ onlySelf: true, emitEvent: false }) :
                this.enable({ onlySelf: true, emitEvent: false });
        }
        else {
            this.value = this._pendingValue = formState;
        }
    }
}
/**
 * Tracks the value and validity state of a group of `FormControl` instances.
 *
 * A `FormGroup` aggregates the values of each child `FormControl` into one object,
 * with each control name as the key.  It calculates its status by reducing the status values
 * of its children. For example, if one of the controls in a group is invalid, the entire
 * group becomes invalid.
 *
 * `FormGroup` is one of the three fundamental building blocks used to define forms in Angular,
 * along with `FormControl` and `FormArray`.
 *
 * When instantiating a `FormGroup`, pass in a collection of child controls as the first
 * argument. The key for each child registers the name for the control.
 *
 * @usageNotes
 *
 * ### Create a form group with 2 controls
 *
 * ```
 * const form = new FormGroup({
 *   first: new FormControl('Nancy', Validators.minLength(2)),
 *   last: new FormControl('Drew'),
 * });
 *
 * console.log(form.value);   // {first: 'Nancy', last; 'Drew'}
 * console.log(form.status);  // 'VALID'
 * ```
 *
 * ### Create a form group with a group-level validator
 *
 * You include group-level validators as the second arg, or group-level async
 * validators as the third arg. These come in handy when you want to perform validation
 * that considers the value of more than one child control.
 *
 * ```
 * const form = new FormGroup({
 *   password: new FormControl('', Validators.minLength(2)),
 *   passwordConfirm: new FormControl('', Validators.minLength(2)),
 * }, passwordMatchValidator);
 *
 *
 * function passwordMatchValidator(g: FormGroup) {
 *    return g.get('password').value === g.get('passwordConfirm').value
 *       ? null : {'mismatch': true};
 * }
 * ```
 *
 * Like `FormControl` instances, you choose to pass in
 * validators and async validators as part of an options object.
 *
 * ```
 * const form = new FormGroup({
 *   password: new FormControl('')
 *   passwordConfirm: new FormControl('')
 * }, { validators: passwordMatchValidator, asyncValidators: otherValidator });
 * ```
 *
 * ### Set the updateOn property for all controls in a form group
 *
 * The options object is used to set a default value for each child
 * control's `updateOn` property. If you set `updateOn` to `'blur'` at the
 * group level, all child controls default to 'blur', unless the child
 * has explicitly specified a different `updateOn` value.
 *
 * ```ts
 * const c = new FormGroup({
 *   one: new FormControl()
 * }, { updateOn: 'blur' });
 * ```
 *
 * @publicApi
 */
export class FormGroup extends AbstractControl {
    /**
     * Creates a new `FormGroup` instance.
     *
     * @param controls A collection of child controls. The key for each child is the name
     * under which it is registered.
     *
     * @param validatorOrOpts A synchronous validator function, or an array of
     * such functions, or an `AbstractControlOptions` object that contains validation functions
     * and a validation trigger.
     *
     * @param asyncValidator A single async validator or array of async validator functions
     *
     */
    constructor(controls, validatorOrOpts, asyncValidator) {
        super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));
        this.controls = controls;
        this._initObservables();
        this._setUpdateStrategy(validatorOrOpts);
        this._setUpControls();
        this.updateValueAndValidity({
            onlySelf: true,
            // If `asyncValidator` is present, it will trigger control status change from `PENDING` to
            // `VALID` or `INVALID`. The status should be broadcasted via the `statusChanges` observable,
            // so we set `emitEvent` to `true` to allow that during the control creation process.
            emitEvent: !!this.asyncValidator
        });
    }
    /**
     * Registers a control with the group's list of controls.
     *
     * This method does not update the value or validity of the control.
     * Use {@link FormGroup#addControl addControl} instead.
     *
     * @param name The control name to register in the collection
     * @param control Provides the control for the given name
     */
    registerControl(name, control) {
        if (this.controls[name])
            return this.controls[name];
        this.controls[name] = control;
        control.setParent(this);
        control._registerOnCollectionChange(this._onCollectionChange);
        return control;
    }
    /**
     * Add a control to this group.
     *
     * If a control with a given name already exists, it would *not* be replaced with a new one.
     * If you want to replace an existing control, use the {@link FormGroup#setControl setControl}
     * method instead. This method also updates the value and validity of the control.
     *
     * @param name The control name to add to the collection
     * @param control Provides the control for the given name
     * @param options Specifies whether this FormGroup instance should emit events after a new
     *     control is added.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control is
     * added. When false, no events are emitted.
     */
    addControl(name, control, options = {}) {
        this.registerControl(name, control);
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
        this._onCollectionChange();
    }
    /**
     * Remove a control from this group.
     *
     * This method also updates the value and validity of the control.
     *
     * @param name The control name to remove from the collection
     * @param options Specifies whether this FormGroup instance should emit events after a
     *     control is removed.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control is
     * removed. When false, no events are emitted.
     */
    removeControl(name, options = {}) {
        if (this.controls[name])
            this.controls[name]._registerOnCollectionChange(() => { });
        delete (this.controls[name]);
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
        this._onCollectionChange();
    }
    /**
     * Replace an existing control.
     *
     * If a control with a given name does not exist in this `FormGroup`, it will be added.
     *
     * @param name The control name to replace in the collection
     * @param control Provides the control for the given name
     * @param options Specifies whether this FormGroup instance should emit events after an
     *     existing control is replaced.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control is
     * replaced with a new one. When false, no events are emitted.
     */
    setControl(name, control, options = {}) {
        if (this.controls[name])
            this.controls[name]._registerOnCollectionChange(() => { });
        delete (this.controls[name]);
        if (control)
            this.registerControl(name, control);
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
        this._onCollectionChange();
    }
    /**
     * Check whether there is an enabled control with the given name in the group.
     *
     * Reports false for disabled controls. If you'd like to check for existence in the group
     * only, use {@link AbstractControl#get get} instead.
     *
     * @param controlName The control name to check for existence in the collection
     *
     * @returns false for disabled controls, true otherwise.
     */
    contains(controlName) {
        return this.controls.hasOwnProperty(controlName) && this.controls[controlName].enabled;
    }
    /**
     * Sets the value of the `FormGroup`. It accepts an object that matches
     * the structure of the group, with control names as keys.
     *
     * @usageNotes
     * ### Set the complete value for the form group
     *
     * ```
     * const form = new FormGroup({
     *   first: new FormControl(),
     *   last: new FormControl()
     * });
     *
     * console.log(form.value);   // {first: null, last: null}
     *
     * form.setValue({first: 'Nancy', last: 'Drew'});
     * console.log(form.value);   // {first: 'Nancy', last: 'Drew'}
     * ```
     *
     * @throws When strict checks fail, such as setting the value of a control
     * that doesn't exist or if you exclude a value of a control that does exist.
     *
     * @param value The new value for the control that matches the structure of the group.
     * @param options Configuration options that determine how the control propagates changes
     * and emits events after the value changes.
     * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
     * updateValueAndValidity} method.
     *
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
     * false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control value is updated.
     * When false, no events are emitted.
     */
    setValue(value, options = {}) {
        this._checkAllValuesPresent(value);
        Object.keys(value).forEach(name => {
            this._throwIfControlMissing(name);
            this.controls[name].setValue(value[name], { onlySelf: true, emitEvent: options.emitEvent });
        });
        this.updateValueAndValidity(options);
    }
    /**
     * Patches the value of the `FormGroup`. It accepts an object with control
     * names as keys, and does its best to match the values to the correct controls
     * in the group.
     *
     * It accepts both super-sets and sub-sets of the group without throwing an error.
     *
     * @usageNotes
     * ### Patch the value for a form group
     *
     * ```
     * const form = new FormGroup({
     *    first: new FormControl(),
     *    last: new FormControl()
     * });
     * console.log(form.value);   // {first: null, last: null}
     *
     * form.patchValue({first: 'Nancy'});
     * console.log(form.value);   // {first: 'Nancy', last: null}
     * ```
     *
     * @param value The object that matches the structure of the group.
     * @param options Configuration options that determine how the control propagates changes and
     * emits events after the value is patched.
     * * `onlySelf`: When true, each change only affects this control and not its parent. Default is
     * true.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control value
     * is updated. When false, no events are emitted. The configuration options are passed to
     * the {@link AbstractControl#updateValueAndValidity updateValueAndValidity} method.
     */
    patchValue(value, options = {}) {
        // Even though the `value` argument type doesn't allow `null` and `undefined` values, the
        // `patchValue` can be called recursively and inner data structures might have these values, so
        // we just ignore such cases when a field containing FormGroup instance receives `null` or
        // `undefined` as a value.
        if (value == null /* both `null` and `undefined` */)
            return;
        Object.keys(value).forEach(name => {
            if (this.controls[name]) {
                this.controls[name].patchValue(value[name], { onlySelf: true, emitEvent: options.emitEvent });
            }
        });
        this.updateValueAndValidity(options);
    }
    /**
     * Resets the `FormGroup`, marks all descendants `pristine` and `untouched` and sets
     * the value of all descendants to null.
     *
     * You reset to a specific form state by passing in a map of states
     * that matches the structure of your form, with control names as keys. The state
     * is a standalone value or a form state object with both a value and a disabled
     * status.
     *
     * @param value Resets the control with an initial value,
     * or an object that defines the initial value and disabled state.
     *
     * @param options Configuration options that determine how the control propagates changes
     * and emits events when the group is reset.
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
     * false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control is reset.
     * When false, no events are emitted.
     * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
     * updateValueAndValidity} method.
     *
     * @usageNotes
     *
     * ### Reset the form group values
     *
     * ```ts
     * const form = new FormGroup({
     *   first: new FormControl('first name'),
     *   last: new FormControl('last name')
     * });
     *
     * console.log(form.value);  // {first: 'first name', last: 'last name'}
     *
     * form.reset({ first: 'name', last: 'last name' });
     *
     * console.log(form.value);  // {first: 'name', last: 'last name'}
     * ```
     *
     * ### Reset the form group values and disabled status
     *
     * ```
     * const form = new FormGroup({
     *   first: new FormControl('first name'),
     *   last: new FormControl('last name')
     * });
     *
     * form.reset({
     *   first: {value: 'name', disabled: true},
     *   last: 'last'
     * });
     *
     * console.log(form.value);  // {last: 'last'}
     * console.log(form.get('first').status);  // 'DISABLED'
     * ```
     */
    reset(value = {}, options = {}) {
        this._forEachChild((control, name) => {
            control.reset(value[name], { onlySelf: true, emitEvent: options.emitEvent });
        });
        this._updatePristine(options);
        this._updateTouched(options);
        this.updateValueAndValidity(options);
    }
    /**
     * The aggregate value of the `FormGroup`, including any disabled controls.
     *
     * Retrieves all values regardless of disabled status.
     * The `value` property is the best way to get the value of the group, because
     * it excludes disabled controls in the `FormGroup`.
     */
    getRawValue() {
        return this._reduceChildren({}, (acc, control, name) => {
            acc[name] = control instanceof FormControl ? control.value : control.getRawValue();
            return acc;
        });
    }
    /** @internal */
    _syncPendingControls() {
        let subtreeUpdated = this._reduceChildren(false, (updated, child) => {
            return child._syncPendingControls() ? true : updated;
        });
        if (subtreeUpdated)
            this.updateValueAndValidity({ onlySelf: true });
        return subtreeUpdated;
    }
    /** @internal */
    _throwIfControlMissing(name) {
        if (!Object.keys(this.controls).length) {
            throw new Error(`
        There are no form controls registered with this group yet. If you're using ngModel,
        you may want to check next tick (e.g. use setTimeout).
      `);
        }
        if (!this.controls[name]) {
            throw new Error(`Cannot find form control with name: ${name}.`);
        }
    }
    /** @internal */
    _forEachChild(cb) {
        Object.keys(this.controls).forEach(key => {
            // The list of controls can change (for ex. controls might be removed) while the loop
            // is running (as a result of invoking Forms API in `valueChanges` subscription), so we
            // have to null check before invoking the callback.
            const control = this.controls[key];
            control && cb(control, key);
        });
    }
    /** @internal */
    _setUpControls() {
        this._forEachChild((control) => {
            control.setParent(this);
            control._registerOnCollectionChange(this._onCollectionChange);
        });
    }
    /** @internal */
    _updateValue() {
        this.value = this._reduceValue();
    }
    /** @internal */
    _anyControls(condition) {
        for (const controlName of Object.keys(this.controls)) {
            const control = this.controls[controlName];
            if (this.contains(controlName) && condition(control)) {
                return true;
            }
        }
        return false;
    }
    /** @internal */
    _reduceValue() {
        return this._reduceChildren({}, (acc, control, name) => {
            if (control.enabled || this.disabled) {
                acc[name] = control.value;
            }
            return acc;
        });
    }
    /** @internal */
    _reduceChildren(initValue, fn) {
        let res = initValue;
        this._forEachChild((control, name) => {
            res = fn(res, control, name);
        });
        return res;
    }
    /** @internal */
    _allControlsDisabled() {
        for (const controlName of Object.keys(this.controls)) {
            if (this.controls[controlName].enabled) {
                return false;
            }
        }
        return Object.keys(this.controls).length > 0 || this.disabled;
    }
    /** @internal */
    _checkAllValuesPresent(value) {
        this._forEachChild((control, name) => {
            if (value[name] === undefined) {
                throw new Error(`Must supply a value for form control with name: '${name}'.`);
            }
        });
    }
}
/**
 * Tracks the value and validity state of an array of `FormControl`,
 * `FormGroup` or `FormArray` instances.
 *
 * A `FormArray` aggregates the values of each child `FormControl` into an array.
 * It calculates its status by reducing the status values of its children. For example, if one of
 * the controls in a `FormArray` is invalid, the entire array becomes invalid.
 *
 * `FormArray` is one of the three fundamental building blocks used to define forms in Angular,
 * along with `FormControl` and `FormGroup`.
 *
 * @usageNotes
 *
 * ### Create an array of form controls
 *
 * ```
 * const arr = new FormArray([
 *   new FormControl('Nancy', Validators.minLength(2)),
 *   new FormControl('Drew'),
 * ]);
 *
 * console.log(arr.value);   // ['Nancy', 'Drew']
 * console.log(arr.status);  // 'VALID'
 * ```
 *
 * ### Create a form array with array-level validators
 *
 * You include array-level validators and async validators. These come in handy
 * when you want to perform validation that considers the value of more than one child
 * control.
 *
 * The two types of validators are passed in separately as the second and third arg
 * respectively, or together as part of an options object.
 *
 * ```
 * const arr = new FormArray([
 *   new FormControl('Nancy'),
 *   new FormControl('Drew')
 * ], {validators: myValidator, asyncValidators: myAsyncValidator});
 * ```
 *
 * ### Set the updateOn property for all controls in a form array
 *
 * The options object is used to set a default value for each child
 * control's `updateOn` property. If you set `updateOn` to `'blur'` at the
 * array level, all child controls default to 'blur', unless the child
 * has explicitly specified a different `updateOn` value.
 *
 * ```ts
 * const arr = new FormArray([
 *    new FormControl()
 * ], {updateOn: 'blur'});
 * ```
 *
 * ### Adding or removing controls from a form array
 *
 * To change the controls in the array, use the `push`, `insert`, `removeAt` or `clear` methods
 * in `FormArray` itself. These methods ensure the controls are properly tracked in the
 * form's hierarchy. Do not modify the array of `AbstractControl`s used to instantiate
 * the `FormArray` directly, as that result in strange and unexpected behavior such
 * as broken change detection.
 *
 * @publicApi
 */
export class FormArray extends AbstractControl {
    /**
     * Creates a new `FormArray` instance.
     *
     * @param controls An array of child controls. Each child control is given an index
     * where it is registered.
     *
     * @param validatorOrOpts A synchronous validator function, or an array of
     * such functions, or an `AbstractControlOptions` object that contains validation functions
     * and a validation trigger.
     *
     * @param asyncValidator A single async validator or array of async validator functions
     *
     */
    constructor(controls, validatorOrOpts, asyncValidator) {
        super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));
        this.controls = controls;
        this._initObservables();
        this._setUpdateStrategy(validatorOrOpts);
        this._setUpControls();
        this.updateValueAndValidity({
            onlySelf: true,
            // If `asyncValidator` is present, it will trigger control status change from `PENDING` to
            // `VALID` or `INVALID`.
            // The status should be broadcasted via the `statusChanges` observable, so we set `emitEvent`
            // to `true` to allow that during the control creation process.
            emitEvent: !!this.asyncValidator
        });
    }
    /**
     * Get the `AbstractControl` at the given `index` in the array.
     *
     * @param index Index in the array to retrieve the control
     */
    at(index) {
        return this.controls[index];
    }
    /**
     * Insert a new `AbstractControl` at the end of the array.
     *
     * @param control Form control to be inserted
     * @param options Specifies whether this FormArray instance should emit events after a new
     *     control is added.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control is
     * inserted. When false, no events are emitted.
     */
    push(control, options = {}) {
        this.controls.push(control);
        this._registerControl(control);
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
        this._onCollectionChange();
    }
    /**
     * Insert a new `AbstractControl` at the given `index` in the array.
     *
     * @param index Index in the array to insert the control
     * @param control Form control to be inserted
     * @param options Specifies whether this FormArray instance should emit events after a new
     *     control is inserted.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control is
     * inserted. When false, no events are emitted.
     */
    insert(index, control, options = {}) {
        this.controls.splice(index, 0, control);
        this._registerControl(control);
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
    }
    /**
     * Remove the control at the given `index` in the array.
     *
     * @param index Index in the array to remove the control
     * @param options Specifies whether this FormArray instance should emit events after a
     *     control is removed.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control is
     * removed. When false, no events are emitted.
     */
    removeAt(index, options = {}) {
        if (this.controls[index])
            this.controls[index]._registerOnCollectionChange(() => { });
        this.controls.splice(index, 1);
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
    }
    /**
     * Replace an existing control.
     *
     * @param index Index in the array to replace the control
     * @param control The `AbstractControl` control to replace the existing control
     * @param options Specifies whether this FormArray instance should emit events after an
     *     existing control is replaced with a new one.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control is
     * replaced with a new one. When false, no events are emitted.
     */
    setControl(index, control, options = {}) {
        if (this.controls[index])
            this.controls[index]._registerOnCollectionChange(() => { });
        this.controls.splice(index, 1);
        if (control) {
            this.controls.splice(index, 0, control);
            this._registerControl(control);
        }
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
        this._onCollectionChange();
    }
    /**
     * Length of the control array.
     */
    get length() {
        return this.controls.length;
    }
    /**
     * Sets the value of the `FormArray`. It accepts an array that matches
     * the structure of the control.
     *
     * This method performs strict checks, and throws an error if you try
     * to set the value of a control that doesn't exist or if you exclude the
     * value of a control.
     *
     * @usageNotes
     * ### Set the values for the controls in the form array
     *
     * ```
     * const arr = new FormArray([
     *   new FormControl(),
     *   new FormControl()
     * ]);
     * console.log(arr.value);   // [null, null]
     *
     * arr.setValue(['Nancy', 'Drew']);
     * console.log(arr.value);   // ['Nancy', 'Drew']
     * ```
     *
     * @param value Array of values for the controls
     * @param options Configure options that determine how the control propagates changes and
     * emits events after the value changes
     *
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default
     * is false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control value is updated.
     * When false, no events are emitted.
     * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
     * updateValueAndValidity} method.
     */
    setValue(value, options = {}) {
        this._checkAllValuesPresent(value);
        value.forEach((newValue, index) => {
            this._throwIfControlMissing(index);
            this.at(index).setValue(newValue, { onlySelf: true, emitEvent: options.emitEvent });
        });
        this.updateValueAndValidity(options);
    }
    /**
     * Patches the value of the `FormArray`. It accepts an array that matches the
     * structure of the control, and does its best to match the values to the correct
     * controls in the group.
     *
     * It accepts both super-sets and sub-sets of the array without throwing an error.
     *
     * @usageNotes
     * ### Patch the values for controls in a form array
     *
     * ```
     * const arr = new FormArray([
     *    new FormControl(),
     *    new FormControl()
     * ]);
     * console.log(arr.value);   // [null, null]
     *
     * arr.patchValue(['Nancy']);
     * console.log(arr.value);   // ['Nancy', null]
     * ```
     *
     * @param value Array of latest values for the controls
     * @param options Configure options that determine how the control propagates changes and
     * emits events after the value changes
     *
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default
     * is false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when the control value
     * is updated. When false, no events are emitted. The configuration options are passed to
     * the {@link AbstractControl#updateValueAndValidity updateValueAndValidity} method.
     */
    patchValue(value, options = {}) {
        // Even though the `value` argument type doesn't allow `null` and `undefined` values, the
        // `patchValue` can be called recursively and inner data structures might have these values, so
        // we just ignore such cases when a field containing FormArray instance receives `null` or
        // `undefined` as a value.
        if (value == null /* both `null` and `undefined` */)
            return;
        value.forEach((newValue, index) => {
            if (this.at(index)) {
                this.at(index).patchValue(newValue, { onlySelf: true, emitEvent: options.emitEvent });
            }
        });
        this.updateValueAndValidity(options);
    }
    /**
     * Resets the `FormArray` and all descendants are marked `pristine` and `untouched`, and the
     * value of all descendants to null or null maps.
     *
     * You reset to a specific form state by passing in an array of states
     * that matches the structure of the control. The state is a standalone value
     * or a form state object with both a value and a disabled status.
     *
     * @usageNotes
     * ### Reset the values in a form array
     *
     * ```ts
     * const arr = new FormArray([
     *    new FormControl(),
     *    new FormControl()
     * ]);
     * arr.reset(['name', 'last name']);
     *
     * console.log(arr.value);  // ['name', 'last name']
     * ```
     *
     * ### Reset the values in a form array and the disabled status for the first control
     *
     * ```
     * arr.reset([
     *   {value: 'name', disabled: true},
     *   'last'
     * ]);
     *
     * console.log(arr.value);  // ['last']
     * console.log(arr.at(0).status);  // 'DISABLED'
     * ```
     *
     * @param value Array of values for the controls
     * @param options Configure options that determine how the control propagates changes and
     * emits events after the value changes
     *
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default
     * is false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control is reset.
     * When false, no events are emitted.
     * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
     * updateValueAndValidity} method.
     */
    reset(value = [], options = {}) {
        this._forEachChild((control, index) => {
            control.reset(value[index], { onlySelf: true, emitEvent: options.emitEvent });
        });
        this._updatePristine(options);
        this._updateTouched(options);
        this.updateValueAndValidity(options);
    }
    /**
     * The aggregate value of the array, including any disabled controls.
     *
     * Reports all values regardless of disabled status.
     * For enabled controls only, the `value` property is the best way to get the value of the array.
     */
    getRawValue() {
        return this.controls.map((control) => {
            return control instanceof FormControl ? control.value : control.getRawValue();
        });
    }
    /**
     * Remove all controls in the `FormArray`.
     *
     * @param options Specifies whether this FormArray instance should emit events after all
     *     controls are removed.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges` observables emit events with the latest status and value when all controls
     * in this FormArray instance are removed. When false, no events are emitted.
     *
     * @usageNotes
     * ### Remove all elements from a FormArray
     *
     * ```ts
     * const arr = new FormArray([
     *    new FormControl(),
     *    new FormControl()
     * ]);
     * console.log(arr.length);  // 2
     *
     * arr.clear();
     * console.log(arr.length);  // 0
     * ```
     *
     * It's a simpler and more efficient alternative to removing all elements one by one:
     *
     * ```ts
     * const arr = new FormArray([
     *    new FormControl(),
     *    new FormControl()
     * ]);
     *
     * while (arr.length) {
     *    arr.removeAt(0);
     * }
     * ```
     */
    clear(options = {}) {
        if (this.controls.length < 1)
            return;
        this._forEachChild((control) => control._registerOnCollectionChange(() => { }));
        this.controls.splice(0);
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
    }
    /** @internal */
    _syncPendingControls() {
        let subtreeUpdated = this.controls.reduce((updated, child) => {
            return child._syncPendingControls() ? true : updated;
        }, false);
        if (subtreeUpdated)
            this.updateValueAndValidity({ onlySelf: true });
        return subtreeUpdated;
    }
    /** @internal */
    _throwIfControlMissing(index) {
        if (!this.controls.length) {
            throw new Error(`
        There are no form controls registered with this array yet. If you're using ngModel,
        you may want to check next tick (e.g. use setTimeout).
      `);
        }
        if (!this.at(index)) {
            throw new Error(`Cannot find form control at index ${index}`);
        }
    }
    /** @internal */
    _forEachChild(cb) {
        this.controls.forEach((control, index) => {
            cb(control, index);
        });
    }
    /** @internal */
    _updateValue() {
        this.value =
            this.controls.filter((control) => control.enabled || this.disabled)
                .map((control) => control.value);
    }
    /** @internal */
    _anyControls(condition) {
        return this.controls.some((control) => control.enabled && condition(control));
    }
    /** @internal */
    _setUpControls() {
        this._forEachChild((control) => this._registerControl(control));
    }
    /** @internal */
    _checkAllValuesPresent(value) {
        this._forEachChild((control, i) => {
            if (value[i] === undefined) {
                throw new Error(`Must supply a value for form control at index: ${i}.`);
            }
        });
    }
    /** @internal */
    _allControlsDisabled() {
        for (const control of this.controls) {
            if (control.enabled)
                return false;
        }
        return this.controls.length > 0 || this.disabled;
    }
    _registerControl(control) {
        control.setParent(this);
        control._registerOnCollectionChange(this._onCollectionChange);
    }
}
//# 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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 {EventEmitter} from '@angular/core';\nimport {Observable} from 'rxjs';\n\nimport {removeListItem} from './directives/shared';\nimport {AsyncValidatorFn, ValidationErrors, ValidatorFn} from './directives/validators';\nimport {addValidators, composeAsyncValidators, composeValidators, hasValidator, makeValidatorsArray, removeValidators, toObservable} from './validators';\n\n/**\n * Reports that a FormControl is valid, meaning that no errors exist in the input value.\n *\n * @see `status`\n */\nexport const VALID = 'VALID';\n\n/**\n * Reports that a FormControl is invalid, meaning that an error exists in the input value.\n *\n * @see `status`\n */\nexport const INVALID = 'INVALID';\n\n/**\n * Reports that a FormControl is pending, meaning that that async validation is occurring and\n * errors are not yet available for the input value.\n *\n * @see `markAsPending`\n * @see `status`\n */\nexport const PENDING = 'PENDING';\n\n/**\n * Reports that a FormControl is disabled, meaning that the control is exempt from ancestor\n * calculations of validity or value.\n *\n * @see `markAsDisabled`\n * @see `status`\n */\nexport const DISABLED = 'DISABLED';\n\nfunction _find(control: AbstractControl, path: Array<string|number>|string, delimiter: string) {\n  if (path == null) return null;\n\n  if (!Array.isArray(path)) {\n    path = path.split(delimiter);\n  }\n  if (Array.isArray(path) && path.length === 0) return null;\n\n  // Not using Array.reduce here due to a Chrome 80 bug\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=1049982\n  let controlToFind: AbstractControl|null = control;\n  path.forEach((name: string|number) => {\n    if (controlToFind instanceof FormGroup) {\n      controlToFind = controlToFind.controls.hasOwnProperty(name as string) ?\n          controlToFind.controls[name] :\n          null;\n    } else if (controlToFind instanceof FormArray) {\n      controlToFind = controlToFind.at(<number>name) || null;\n    } else {\n      controlToFind = null;\n    }\n  });\n  return controlToFind;\n}\n\n/**\n * Gets validators from either an options object or given validators.\n */\nfunction pickValidators(validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|\n                        null): ValidatorFn|ValidatorFn[]|null {\n  return (isOptionsObj(validatorOrOpts) ? validatorOrOpts.validators : validatorOrOpts) || null;\n}\n\n/**\n * Creates validator function by combining provided validators.\n */\nfunction coerceToValidator(validator: ValidatorFn|ValidatorFn[]|null): ValidatorFn|null {\n  return Array.isArray(validator) ? composeValidators(validator) : validator || null;\n}\n\n/**\n * Gets async validators from either an options object or given validators.\n */\nfunction pickAsyncValidators(\n    asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null,\n    validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null): AsyncValidatorFn|\n    AsyncValidatorFn[]|null {\n  return (isOptionsObj(validatorOrOpts) ? validatorOrOpts.asyncValidators : asyncValidator) || null;\n}\n\n/**\n * Creates async validator function by combining provided async validators.\n */\nfunction coerceToAsyncValidator(asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|\n                                null): AsyncValidatorFn|null {\n  return Array.isArray(asyncValidator) ? composeAsyncValidators(asyncValidator) :\n                                         asyncValidator || null;\n}\n\nexport type FormHooks = 'change'|'blur'|'submit';\n\n/**\n * Interface for options provided to an `AbstractControl`.\n *\n * @publicApi\n */\nexport interface AbstractControlOptions {\n  /**\n   * @description\n   * The list of validators applied to a control.\n   */\n  validators?: ValidatorFn|ValidatorFn[]|null;\n  /**\n   * @description\n   * The list of async validators applied to control.\n   */\n  asyncValidators?: AsyncValidatorFn|AsyncValidatorFn[]|null;\n  /**\n   * @description\n   * The event name for control to update upon.\n   */\n  updateOn?: 'change'|'blur'|'submit';\n}\n\nfunction isOptionsObj(validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|\n                      null): validatorOrOpts is AbstractControlOptions {\n  return validatorOrOpts != null && !Array.isArray(validatorOrOpts) &&\n      typeof validatorOrOpts === 'object';\n}\n\n/**\n * This is the base class for `FormControl`, `FormGroup`, and `FormArray`.\n *\n * It provides some of the shared behavior that all controls and groups of controls have, like\n * running validators, calculating status, and resetting state. It also defines the properties\n * that are shared between all sub-classes, like `value`, `valid`, and `dirty`. It shouldn't be\n * instantiated directly.\n *\n * @see [Forms Guide](/guide/forms)\n * @see [Reactive Forms Guide](/guide/reactive-forms)\n * @see [Dynamic Forms Guide](/guide/dynamic-form)\n *\n * @publicApi\n */\nexport abstract class AbstractControl {\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _pendingDirty!: boolean;\n\n  /**\n   * Indicates that a control has its own pending asynchronous validation in progress.\n   *\n   * @internal\n   */\n  _hasOwnPendingAsyncValidator = false;\n\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _pendingTouched!: boolean;\n\n  /** @internal */\n  _onCollectionChange = () => {};\n\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _updateOn!: FormHooks;\n\n  private _parent: FormGroup|FormArray|null = null;\n  private _asyncValidationSubscription: any;\n\n  /**\n   * Contains the result of merging synchronous validators into a single validator function\n   * (combined using `Validators.compose`).\n   *\n   * @internal\n   */\n  private _composedValidatorFn: ValidatorFn|null;\n\n  /**\n   * Contains the result of merging asynchronous validators into a single validator function\n   * (combined using `Validators.composeAsync`).\n   *\n   * @internal\n   */\n  private _composedAsyncValidatorFn: AsyncValidatorFn|null;\n\n  /**\n   * Synchronous validators as they were provided:\n   *  - in `AbstractControl` constructor\n   *  - as an argument while calling `setValidators` function\n   *  - while calling the setter on the `validator` field (e.g. `control.validator = validatorFn`)\n   *\n   * @internal\n   */\n  private _rawValidators: ValidatorFn|ValidatorFn[]|null;\n\n  /**\n   * Asynchronous validators as they were provided:\n   *  - in `AbstractControl` constructor\n   *  - as an argument while calling `setAsyncValidators` function\n   *  - while calling the setter on the `asyncValidator` field (e.g. `control.asyncValidator =\n   * asyncValidatorFn`)\n   *\n   * @internal\n   */\n  private _rawAsyncValidators: AsyncValidatorFn|AsyncValidatorFn[]|null;\n\n  /**\n   * The current value of the control.\n   *\n   * * For a `FormControl`, the current value.\n   * * For an enabled `FormGroup`, the values of enabled controls as an object\n   * with a key-value pair for each member of the group.\n   * * For a disabled `FormGroup`, the values of all controls as an object\n   * with a key-value pair for each member of the group.\n   * * For a `FormArray`, the values of enabled controls as an array.\n   *\n   */\n  public readonly value: any;\n\n  /**\n   * Initialize the AbstractControl instance.\n   *\n   * @param validators The function or array of functions that is used to determine the validity of\n   *     this control synchronously.\n   * @param asyncValidators The function or array of functions that is used to determine validity of\n   *     this control asynchronously.\n   */\n  constructor(\n      validators: ValidatorFn|ValidatorFn[]|null,\n      asyncValidators: AsyncValidatorFn|AsyncValidatorFn[]|null) {\n    this._rawValidators = validators;\n    this._rawAsyncValidators = asyncValidators;\n    this._composedValidatorFn = coerceToValidator(this._rawValidators);\n    this._composedAsyncValidatorFn = coerceToAsyncValidator(this._rawAsyncValidators);\n  }\n\n  /**\n   * Returns the function that is used to determine the validity of this control synchronously.\n   * If multiple validators have been added, this will be a single composed function.\n   * See `Validators.compose()` for additional information.\n   */\n  get validator(): ValidatorFn|null {\n    return this._composedValidatorFn;\n  }\n  set validator(validatorFn: ValidatorFn|null) {\n    this._rawValidators = this._composedValidatorFn = validatorFn;\n  }\n\n  /**\n   * Returns the function that is used to determine the validity of this control asynchronously.\n   * If multiple validators have been added, this will be a single composed function.\n   * See `Validators.compose()` for additional information.\n   */\n  get asyncValidator(): AsyncValidatorFn|null {\n    return this._composedAsyncValidatorFn;\n  }\n  set asyncValidator(asyncValidatorFn: AsyncValidatorFn|null) {\n    this._rawAsyncValidators = this._composedAsyncValidatorFn = asyncValidatorFn;\n  }\n\n  /**\n   * The parent control.\n   */\n  get parent(): FormGroup|FormArray|null {\n    return this._parent;\n  }\n\n  /**\n   * The validation status of the control. There are four possible\n   * validation status values:\n   *\n   * * **VALID**: This control has passed all validation checks.\n   * * **INVALID**: This control has failed at least one validation check.\n   * * **PENDING**: This control is in the midst of conducting a validation check.\n   * * **DISABLED**: This control is exempt from validation checks.\n   *\n   * These status values are mutually exclusive, so a control cannot be\n   * both valid AND invalid or invalid AND disabled.\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly status!: string;\n\n  /**\n   * A control is `valid` when its `status` is `VALID`.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @returns True if the control has passed all of its validation tests,\n   * false otherwise.\n   */\n  get valid(): boolean {\n    return this.status === VALID;\n  }\n\n  /**\n   * A control is `invalid` when its `status` is `INVALID`.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @returns True if this control has failed one or more of its validation checks,\n   * false otherwise.\n   */\n  get invalid(): boolean {\n    return this.status === INVALID;\n  }\n\n  /**\n   * A control is `pending` when its `status` is `PENDING`.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @returns True if this control is in the process of conducting a validation check,\n   * false otherwise.\n   */\n  get pending(): boolean {\n    return this.status == PENDING;\n  }\n\n  /**\n   * A control is `disabled` when its `status` is `DISABLED`.\n   *\n   * Disabled controls are exempt from validation checks and\n   * are not included in the aggregate value of their ancestor\n   * controls.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @returns True if the control is disabled, false otherwise.\n   */\n  get disabled(): boolean {\n    return this.status === DISABLED;\n  }\n\n  /**\n   * A control is `enabled` as long as its `status` is not `DISABLED`.\n   *\n   * @returns True if the control has any status other than 'DISABLED',\n   * false if the status is 'DISABLED'.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   */\n  get enabled(): boolean {\n    return this.status !== DISABLED;\n  }\n\n  /**\n   * An object containing any errors generated by failing validation,\n   * or null if there are no errors.\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly errors!: ValidationErrors|null;\n\n  /**\n   * A control is `pristine` if the user has not yet changed\n   * the value in the UI.\n   *\n   * @returns True if the user has not yet changed the value in the UI; compare `dirty`.\n   * Programmatic changes to a control's value do not mark it dirty.\n   */\n  public readonly pristine: boolean = true;\n\n  /**\n   * A control is `dirty` if the user has changed the value\n   * in the UI.\n   *\n   * @returns True if the user has changed the value of this control in the UI; compare `pristine`.\n   * Programmatic changes to a control's value do not mark it dirty.\n   */\n  get dirty(): boolean {\n    return !this.pristine;\n  }\n\n  /**\n   * True if the control is marked as `touched`.\n   *\n   * A control is marked `touched` once the user has triggered\n   * a `blur` event on it.\n   */\n  public readonly touched: boolean = false;\n\n  /**\n   * True if the control has not been marked as touched\n   *\n   * A control is `untouched` if the user has not yet triggered\n   * a `blur` event on it.\n   */\n  get untouched(): boolean {\n    return !this.touched;\n  }\n\n  /**\n   * A multicasting observable that emits an event every time the value of the control changes, in\n   * the UI or programmatically. It also emits an event each time you call enable() or disable()\n   * without passing along {emitEvent: false} as a function argument.\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly valueChanges!: Observable<any>;\n\n  /**\n   * A multicasting observable that emits an event every time the validation `status` of the control\n   * recalculates.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   */\n  // TODO(issue/24571): remove '!'.\n  public readonly statusChanges!: Observable<any>;\n\n  /**\n   * Reports the update strategy of the `AbstractControl` (meaning\n   * the event on which the control updates itself).\n   * Possible values: `'change'` | `'blur'` | `'submit'`\n   * Default value: `'change'`\n   */\n  get updateOn(): FormHooks {\n    return this._updateOn ? this._updateOn : (this.parent ? this.parent.updateOn : 'change');\n  }\n\n  /**\n   * Sets the synchronous validators that are active on this control.  Calling\n   * this overwrites any existing synchronous validators.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * If you want to add a new validator without affecting existing ones, consider\n   * using `addValidators()` method instead.\n   */\n  setValidators(validators: ValidatorFn|ValidatorFn[]|null): void {\n    this._rawValidators = validators;\n    this._composedValidatorFn = coerceToValidator(validators);\n  }\n\n  /**\n   * Sets the asynchronous validators that are active on this control. Calling this\n   * overwrites any existing asynchronous validators.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * If you want to add a new validator without affecting existing ones, consider\n   * using `addAsyncValidators()` method instead.\n   */\n  setAsyncValidators(validators: AsyncValidatorFn|AsyncValidatorFn[]|null): void {\n    this._rawAsyncValidators = validators;\n    this._composedAsyncValidatorFn = coerceToAsyncValidator(validators);\n  }\n\n  /**\n   * Add a synchronous validator or validators to this control, without affecting other validators.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * Adding a validator that already exists will have no effect. If duplicate validator functions\n   * are present in the `validators` array, only the first instance would be added to a form\n   * control.\n   *\n   * @param validators The new validator function or functions to add to this control.\n   */\n  addValidators(validators: ValidatorFn|ValidatorFn[]): void {\n    this.setValidators(addValidators(validators, this._rawValidators));\n  }\n\n  /**\n   * Add an asynchronous validator or validators to this control, without affecting other\n   * validators.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * Adding a validator that already exists will have no effect.\n   *\n   * @param validators The new asynchronous validator function or functions to add to this control.\n   */\n  addAsyncValidators(validators: AsyncValidatorFn|AsyncValidatorFn[]): void {\n    this.setAsyncValidators(addValidators(validators, this._rawAsyncValidators));\n  }\n\n  /**\n   * Remove a synchronous validator from this control, without affecting other validators.\n   * Validators are compared by function reference; you must pass a reference to the exact same\n   * validator function as the one that was originally set. If a provided validator is not found,\n   * it is ignored.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * @param validators The validator or validators to remove.\n   */\n  removeValidators(validators: ValidatorFn|ValidatorFn[]): void {\n    this.setValidators(removeValidators(validators, this._rawValidators));\n  }\n\n  /**\n   * Remove an asynchronous validator from this control, without affecting other validators.\n   * Validators are compared by function reference; you must pass a reference to the exact same\n   * validator function as the one that was originally set. If a provided validator is not found, it\n   * is ignored.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   * @param validators The asynchronous validator or validators to remove.\n   */\n  removeAsyncValidators(validators: AsyncValidatorFn|AsyncValidatorFn[]): void {\n    this.setAsyncValidators(removeValidators(validators, this._rawAsyncValidators));\n  }\n\n  /**\n   * Check whether a synchronous validator function is present on this control. The provided\n   * validator must be a reference to the exact same function that was provided.\n   *\n   * @param validator The validator to check for presence. Compared by function reference.\n   * @returns Whether the provided validator was found on this control.\n   */\n  hasValidator(validator: ValidatorFn): boolean {\n    return hasValidator(this._rawValidators, validator);\n  }\n\n  /**\n   * Check whether an asynchronous validator function is present on this control. The provided\n   * validator must be a reference to the exact same function that was provided.\n   *\n   * @param validator The asynchronous validator to check for presence. Compared by function\n   *     reference.\n   * @returns Whether the provided asynchronous validator was found on this control.\n   */\n  hasAsyncValidator(validator: AsyncValidatorFn): boolean {\n    return hasValidator(this._rawAsyncValidators, validator);\n  }\n\n  /**\n   * Empties out the synchronous validator list.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   */\n  clearValidators(): void {\n    this.validator = null;\n  }\n\n  /**\n   * Empties out the async validator list.\n   *\n   * When you add or remove a validator at run time, you must call\n   * `updateValueAndValidity()` for the new validation to take effect.\n   *\n   */\n  clearAsyncValidators(): void {\n    this.asyncValidator = null;\n  }\n\n  /**\n   * Marks the control as `touched`. A control is touched by focus and\n   * blur events that do not change the value.\n   *\n   * @see `markAsUntouched()`\n   * @see `markAsDirty()`\n   * @see `markAsPristine()`\n   *\n   * @param opts Configuration options that determine how the control propagates changes\n   * and emits events after marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   */\n  markAsTouched(opts: {onlySelf?: boolean} = {}): void {\n    (this as {touched: boolean}).touched = true;\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent.markAsTouched(opts);\n    }\n  }\n\n  /**\n   * Marks the control and all its descendant controls as `touched`.\n   * @see `markAsTouched()`\n   */\n  markAllAsTouched(): void {\n    this.markAsTouched({onlySelf: true});\n\n    this._forEachChild((control: AbstractControl) => control.markAllAsTouched());\n  }\n\n  /**\n   * Marks the control as `untouched`.\n   *\n   * If the control has any children, also marks all children as `untouched`\n   * and recalculates the `touched` status of all parent controls.\n   *\n   * @see `markAsTouched()`\n   * @see `markAsDirty()`\n   * @see `markAsPristine()`\n   *\n   * @param opts Configuration options that determine how the control propagates changes\n   * and emits events after the marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   */\n  markAsUntouched(opts: {onlySelf?: boolean} = {}): void {\n    (this as {touched: boolean}).touched = false;\n    this._pendingTouched = false;\n\n    this._forEachChild((control: AbstractControl) => {\n      control.markAsUntouched({onlySelf: true});\n    });\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent._updateTouched(opts);\n    }\n  }\n\n  /**\n   * Marks the control as `dirty`. A control becomes dirty when\n   * the control's value is changed through the UI; compare `markAsTouched`.\n   *\n   * @see `markAsTouched()`\n   * @see `markAsUntouched()`\n   * @see `markAsPristine()`\n   *\n   * @param opts Configuration options that determine how the control propagates changes\n   * and emits events after marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   */\n  markAsDirty(opts: {onlySelf?: boolean} = {}): void {\n    (this as {pristine: boolean}).pristine = false;\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent.markAsDirty(opts);\n    }\n  }\n\n  /**\n   * Marks the control as `pristine`.\n   *\n   * If the control has any children, marks all children as `pristine`,\n   * and recalculates the `pristine` status of all parent\n   * controls.\n   *\n   * @see `markAsTouched()`\n   * @see `markAsUntouched()`\n   * @see `markAsDirty()`\n   *\n   * @param opts Configuration options that determine how the control emits events after\n   * marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   */\n  markAsPristine(opts: {onlySelf?: boolean} = {}): void {\n    (this as {pristine: boolean}).pristine = true;\n    this._pendingDirty = false;\n\n    this._forEachChild((control: AbstractControl) => {\n      control.markAsPristine({onlySelf: true});\n    });\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent._updatePristine(opts);\n    }\n  }\n\n  /**\n   * Marks the control as `pending`.\n   *\n   * A control is pending while the control performs async validation.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @param opts Configuration options that determine how the control propagates changes and\n   * emits events after marking is applied.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   * * `emitEvent`: When true or not supplied (the default), the `statusChanges`\n   * observable emits an event with the latest status the control is marked pending.\n   * When false, no events are emitted.\n   *\n   */\n  markAsPending(opts: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    (this as {status: string}).status = PENDING;\n\n    if (opts.emitEvent !== false) {\n      (this.statusChanges as EventEmitter<any>).emit(this.status);\n    }\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent.markAsPending(opts);\n    }\n  }\n\n  /**\n   * Disables the control. This means the control is exempt from validation checks and\n   * excluded from the aggregate value of any parent. Its status is `DISABLED`.\n   *\n   * If the control has children, all children are also disabled.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @param opts Configuration options that determine how the control propagates\n   * changes and emits events after the control is disabled.\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is disabled.\n   * When false, no events are emitted.\n   */\n  disable(opts: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    // If parent has been marked artificially dirty we don't want to re-calculate the\n    // parent's dirtiness based on the children.\n    const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);\n\n    (this as {status: string}).status = DISABLED;\n    (this as {errors: ValidationErrors | null}).errors = null;\n    this._forEachChild((control: AbstractControl) => {\n      control.disable({...opts, onlySelf: true});\n    });\n    this._updateValue();\n\n    if (opts.emitEvent !== false) {\n      (this.valueChanges as EventEmitter<any>).emit(this.value);\n      (this.statusChanges as EventEmitter<string>).emit(this.status);\n    }\n\n    this._updateAncestors({...opts, skipPristineCheck});\n    this._onDisabledChange.forEach((changeFn) => changeFn(true));\n  }\n\n  /**\n   * Enables the control. This means the control is included in validation checks and\n   * the aggregate value of its parent. Its status recalculates based on its value and\n   * its validators.\n   *\n   * By default, if the control has children, all children are enabled.\n   *\n   * @see {@link AbstractControl.status}\n   *\n   * @param opts Configure options that control how the control propagates changes and\n   * emits events when marked as untouched\n   * * `onlySelf`: When true, mark only this control. When false or not supplied,\n   * marks all direct ancestors. Default is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is enabled.\n   * When false, no events are emitted.\n   */\n  enable(opts: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    // If parent has been marked artificially dirty we don't want to re-calculate the\n    // parent's dirtiness based on the children.\n    const skipPristineCheck = this._parentMarkedDirty(opts.onlySelf);\n\n    (this as {status: string}).status = VALID;\n    this._forEachChild((control: AbstractControl) => {\n      control.enable({...opts, onlySelf: true});\n    });\n    this.updateValueAndValidity({onlySelf: true, emitEvent: opts.emitEvent});\n\n    this._updateAncestors({...opts, skipPristineCheck});\n    this._onDisabledChange.forEach((changeFn) => changeFn(false));\n  }\n\n  private _updateAncestors(\n      opts: {onlySelf?: boolean, emitEvent?: boolean, skipPristineCheck?: boolean}) {\n    if (this._parent && !opts.onlySelf) {\n      this._parent.updateValueAndValidity(opts);\n      if (!opts.skipPristineCheck) {\n        this._parent._updatePristine();\n      }\n      this._parent._updateTouched();\n    }\n  }\n\n  /**\n   * @param parent Sets the parent of the control\n   */\n  setParent(parent: FormGroup|FormArray): void {\n    this._parent = parent;\n  }\n\n  /**\n   * Sets the value of the control. Abstract method (implemented in sub-classes).\n   */\n  abstract setValue(value: any, options?: Object): void;\n\n  /**\n   * Patches the value of the control. Abstract method (implemented in sub-classes).\n   */\n  abstract patchValue(value: any, options?: Object): void;\n\n  /**\n   * Resets the control. Abstract method (implemented in sub-classes).\n   */\n  abstract reset(value?: any, options?: Object): void;\n\n  /**\n   * Recalculates the value and validation status of the control.\n   *\n   * By default, it also updates the value and validity of its ancestors.\n   *\n   * @param opts Configuration options determine how the control propagates changes and emits events\n   * after updates and validity checks are applied.\n   * * `onlySelf`: When true, only update this control. When false or not supplied,\n   * update all direct ancestors. Default is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is updated.\n   * When false, no events are emitted.\n   */\n  updateValueAndValidity(opts: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._setInitialStatus();\n    this._updateValue();\n\n    if (this.enabled) {\n      this._cancelExistingSubscription();\n      (this as {errors: ValidationErrors | null}).errors = this._runValidator();\n      (this as {status: string}).status = this._calculateStatus();\n\n      if (this.status === VALID || this.status === PENDING) {\n        this._runAsyncValidator(opts.emitEvent);\n      }\n    }\n\n    if (opts.emitEvent !== false) {\n      (this.valueChanges as EventEmitter<any>).emit(this.value);\n      (this.statusChanges as EventEmitter<string>).emit(this.status);\n    }\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent.updateValueAndValidity(opts);\n    }\n  }\n\n  /** @internal */\n  _updateTreeValidity(opts: {emitEvent?: boolean} = {emitEvent: true}) {\n    this._forEachChild((ctrl: AbstractControl) => ctrl._updateTreeValidity(opts));\n    this.updateValueAndValidity({onlySelf: true, emitEvent: opts.emitEvent});\n  }\n\n  private _setInitialStatus() {\n    (this as {status: string}).status = this._allControlsDisabled() ? DISABLED : VALID;\n  }\n\n  private _runValidator(): ValidationErrors|null {\n    return this.validator ? this.validator(this) : null;\n  }\n\n  private _runAsyncValidator(emitEvent?: boolean): void {\n    if (this.asyncValidator) {\n      (this as {status: string}).status = PENDING;\n      this._hasOwnPendingAsyncValidator = true;\n      const obs = toObservable(this.asyncValidator(this));\n      this._asyncValidationSubscription = obs.subscribe((errors: ValidationErrors|null) => {\n        this._hasOwnPendingAsyncValidator = false;\n        // This will trigger the recalculation of the validation status, which depends on\n        // the state of the asynchronous validation (whether it is in progress or not). So, it is\n        // necessary that we have updated the `_hasOwnPendingAsyncValidator` boolean flag first.\n        this.setErrors(errors, {emitEvent});\n      });\n    }\n  }\n\n  private _cancelExistingSubscription(): void {\n    if (this._asyncValidationSubscription) {\n      this._asyncValidationSubscription.unsubscribe();\n      this._hasOwnPendingAsyncValidator = false;\n    }\n  }\n\n  /**\n   * Sets errors on a form control when running validations manually, rather than automatically.\n   *\n   * Calling `setErrors` also updates the validity of the parent control.\n   *\n   * @usageNotes\n   *\n   * ### Manually set the errors for a control\n   *\n   * ```\n   * const login = new FormControl('someLogin');\n   * login.setErrors({\n   *   notUnique: true\n   * });\n   *\n   * expect(login.valid).toEqual(false);\n   * expect(login.errors).toEqual({ notUnique: true });\n   *\n   * login.setValue('someOtherLogin');\n   *\n   * expect(login.valid).toEqual(true);\n   * ```\n   */\n  setErrors(errors: ValidationErrors|null, opts: {emitEvent?: boolean} = {}): void {\n    (this as {errors: ValidationErrors | null}).errors = errors;\n    this._updateControlsErrors(opts.emitEvent !== false);\n  }\n\n  /**\n   * Retrieves a child control given the control's name or path.\n   *\n   * @param path A dot-delimited string or array of string/number values that define the path to the\n   * control.\n   *\n   * @usageNotes\n   * ### Retrieve a nested control\n   *\n   * For example, to get a `name` control nested within a `person` sub-group:\n   *\n   * * `this.form.get('person.name');`\n   *\n   * -OR-\n   *\n   * * `this.form.get(['person', 'name']);`\n   *\n   * ### Retrieve a control in a FormArray\n   *\n   * When accessing an element inside a FormArray, you can use an element index.\n   * For example, to get a `price` control from the first element in an `items` array you can use:\n   *\n   * * `this.form.get('items.0.price');`\n   *\n   * -OR-\n   *\n   * * `this.form.get(['items', 0, 'price']);`\n   */\n  get(path: Array<string|number>|string): AbstractControl|null {\n    return _find(this, path, '.');\n  }\n\n  /**\n   * @description\n   * Reports error data for the control with the given path.\n   *\n   * @param errorCode The code of the error to check\n   * @param path A list of control names that designates how to move from the current control\n   * to the control that should be queried for errors.\n   *\n   * @usageNotes\n   * For example, for the following `FormGroup`:\n   *\n   * ```\n   * form = new FormGroup({\n   *   address: new FormGroup({ street: new FormControl() })\n   * });\n   * ```\n   *\n   * The path to the 'street' control from the root form would be 'address' -> 'street'.\n   *\n   * It can be provided to this method in one of two formats:\n   *\n   * 1. An array of string control names, e.g. `['address', 'street']`\n   * 1. A period-delimited list of control names in one string, e.g. `'address.street'`\n   *\n   * @returns error data for that particular error. If the control or error is not present,\n   * null is returned.\n   */\n  getError(errorCode: string, path?: Array<string|number>|string): any {\n    const control = path ? this.get(path) : this;\n    return control && control.errors ? control.errors[errorCode] : null;\n  }\n\n  /**\n   * @description\n   * Reports whether the control with the given path has the error specified.\n   *\n   * @param errorCode The code of the error to check\n   * @param path A list of control names that designates how to move from the current control\n   * to the control that should be queried for errors.\n   *\n   * @usageNotes\n   * For example, for the following `FormGroup`:\n   *\n   * ```\n   * form = new FormGroup({\n   *   address: new FormGroup({ street: new FormControl() })\n   * });\n   * ```\n   *\n   * The path to the 'street' control from the root form would be 'address' -> 'street'.\n   *\n   * It can be provided to this method in one of two formats:\n   *\n   * 1. An array of string control names, e.g. `['address', 'street']`\n   * 1. A period-delimited list of control names in one string, e.g. `'address.street'`\n   *\n   * If no path is given, this method checks for the error on the current control.\n   *\n   * @returns whether the given error is present in the control at the given path.\n   *\n   * If the control is not present, false is returned.\n   */\n  hasError(errorCode: string, path?: Array<string|number>|string): boolean {\n    return !!this.getError(errorCode, path);\n  }\n\n  /**\n   * Retrieves the top-level ancestor of this control.\n   */\n  get root(): AbstractControl {\n    let x: AbstractControl = this;\n\n    while (x._parent) {\n      x = x._parent;\n    }\n\n    return x;\n  }\n\n  /** @internal */\n  _updateControlsErrors(emitEvent: boolean): void {\n    (this as {status: string}).status = this._calculateStatus();\n\n    if (emitEvent) {\n      (this.statusChanges as EventEmitter<string>).emit(this.status);\n    }\n\n    if (this._parent) {\n      this._parent._updateControlsErrors(emitEvent);\n    }\n  }\n\n  /** @internal */\n  _initObservables() {\n    (this as {valueChanges: Observable<any>}).valueChanges = new EventEmitter();\n    (this as {statusChanges: Observable<any>}).statusChanges = new EventEmitter();\n  }\n\n\n  private _calculateStatus(): string {\n    if (this._allControlsDisabled()) return DISABLED;\n    if (this.errors) return INVALID;\n    if (this._hasOwnPendingAsyncValidator || this._anyControlsHaveStatus(PENDING)) return PENDING;\n    if (this._anyControlsHaveStatus(INVALID)) return INVALID;\n    return VALID;\n  }\n\n  /** @internal */\n  abstract _updateValue(): void;\n\n  /** @internal */\n  abstract _forEachChild(cb: Function): void;\n\n  /** @internal */\n  abstract _anyControls(condition: Function): boolean;\n\n  /** @internal */\n  abstract _allControlsDisabled(): boolean;\n\n  /** @internal */\n  abstract _syncPendingControls(): boolean;\n\n  /** @internal */\n  _anyControlsHaveStatus(status: string): boolean {\n    return this._anyControls((control: AbstractControl) => control.status === status);\n  }\n\n  /** @internal */\n  _anyControlsDirty(): boolean {\n    return this._anyControls((control: AbstractControl) => control.dirty);\n  }\n\n  /** @internal */\n  _anyControlsTouched(): boolean {\n    return this._anyControls((control: AbstractControl) => control.touched);\n  }\n\n  /** @internal */\n  _updatePristine(opts: {onlySelf?: boolean} = {}): void {\n    (this as {pristine: boolean}).pristine = !this._anyControlsDirty();\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent._updatePristine(opts);\n    }\n  }\n\n  /** @internal */\n  _updateTouched(opts: {onlySelf?: boolean} = {}): void {\n    (this as {touched: boolean}).touched = this._anyControlsTouched();\n\n    if (this._parent && !opts.onlySelf) {\n      this._parent._updateTouched(opts);\n    }\n  }\n\n  /** @internal */\n  _onDisabledChange: Function[] = [];\n\n  /** @internal */\n  _isBoxedValue(formState: any): boolean {\n    return typeof formState === 'object' && formState !== null &&\n        Object.keys(formState).length === 2 && 'value' in formState && 'disabled' in formState;\n  }\n\n  /** @internal */\n  _registerOnCollectionChange(fn: () => void): void {\n    this._onCollectionChange = fn;\n  }\n\n  /** @internal */\n  _setUpdateStrategy(opts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null): void {\n    if (isOptionsObj(opts) && opts.updateOn != null) {\n      this._updateOn = opts.updateOn!;\n    }\n  }\n\n  /**\n   * Check to see if parent has been marked artificially dirty.\n   *\n   * @internal\n   */\n  private _parentMarkedDirty(onlySelf?: boolean): boolean {\n    const parentDirty = this._parent && this._parent.dirty;\n    return !onlySelf && !!parentDirty && !this._parent!._anyControlsDirty();\n  }\n}\n\n/**\n * Tracks the value and validation status of an individual form control.\n *\n * This is one of the three fundamental building blocks of Angular forms, along with\n * `FormGroup` and `FormArray`. It extends the `AbstractControl` class that\n * implements most of the base functionality for accessing the value, validation status,\n * user interactions and events. See [usage examples below](#usage-notes).\n *\n * @see `AbstractControl`\n * @see [Reactive Forms Guide](guide/reactive-forms)\n * @see [Usage Notes](#usage-notes)\n *\n * @usageNotes\n *\n * ### Initializing Form Controls\n *\n * Instantiate a `FormControl`, with an initial value.\n *\n * ```ts\n * const control = new FormControl('some value');\n * console.log(control.value);     // 'some value'\n *```\n *\n * The following example initializes the control with a form state object. The `value`\n * and `disabled` keys are required in this case.\n *\n * ```ts\n * const control = new FormControl({ value: 'n/a', disabled: true });\n * console.log(control.value);     // 'n/a'\n * console.log(control.status);    // 'DISABLED'\n * ```\n *\n * The following example initializes the control with a synchronous validator.\n *\n * ```ts\n * const control = new FormControl('', Validators.required);\n * console.log(control.value);      // ''\n * console.log(control.status);     // 'INVALID'\n * ```\n *\n * The following example initializes the control using an options object.\n *\n * ```ts\n * const control = new FormControl('', {\n *    validators: Validators.required,\n *    asyncValidators: myAsyncValidator\n * });\n * ```\n *\n * ### Configure the control to update on a blur event\n *\n * Set the `updateOn` option to `'blur'` to update on the blur `event`.\n *\n * ```ts\n * const control = new FormControl('', { updateOn: 'blur' });\n * ```\n *\n * ### Configure the control to update on a submit event\n *\n * Set the `updateOn` option to `'submit'` to update on a submit `event`.\n *\n * ```ts\n * const control = new FormControl('', { updateOn: 'submit' });\n * ```\n *\n * ### Reset the control back to an initial value\n *\n * You reset to a specific form state by passing through a standalone\n * value or a form state object that contains both a value and a disabled state\n * (these are the only two properties that cannot be calculated).\n *\n * ```ts\n * const control = new FormControl('Nancy');\n *\n * console.log(control.value); // 'Nancy'\n *\n * control.reset('Drew');\n *\n * console.log(control.value); // 'Drew'\n * ```\n *\n * ### Reset the control back to an initial value and disabled\n *\n * ```\n * const control = new FormControl('Nancy');\n *\n * console.log(control.value); // 'Nancy'\n * console.log(control.status); // 'VALID'\n *\n * control.reset({ value: 'Drew', disabled: true });\n *\n * console.log(control.value); // 'Drew'\n * console.log(control.status); // 'DISABLED'\n * ```\n *\n * @publicApi\n */\nexport class FormControl extends AbstractControl {\n  /** @internal */\n  _onChange: Function[] = [];\n\n  /** @internal */\n  _pendingValue: any;\n\n  /** @internal */\n  _pendingChange: any;\n\n  /**\n   * Creates a new `FormControl` instance.\n   *\n   * @param formState Initializes the control with an initial value,\n   * or an object that defines the initial value and disabled state.\n   *\n   * @param validatorOrOpts A synchronous validator function, or an array of\n   * such functions, or an `AbstractControlOptions` object that contains validation functions\n   * and a validation trigger.\n   *\n   * @param asyncValidator A single async validator or array of async validator functions\n   *\n   */\n  constructor(\n      formState: any = null,\n      validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null,\n      asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null) {\n    super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));\n    this._applyFormState(formState);\n    this._setUpdateStrategy(validatorOrOpts);\n    this._initObservables();\n    this.updateValueAndValidity({\n      onlySelf: true,\n      // If `asyncValidator` is present, it will trigger control status change from `PENDING` to\n      // `VALID` or `INVALID`.\n      // The status should be broadcasted via the `statusChanges` observable, so we set `emitEvent`\n      // to `true` to allow that during the control creation process.\n      emitEvent: !!this.asyncValidator\n    });\n  }\n\n  /**\n   * Sets a new value for the form control.\n   *\n   * @param value The new value for the control.\n   * @param options Configuration options that determine how the control propagates changes\n   * and emits events when the value changes.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is\n   * false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control value is updated.\n   * When false, no events are emitted.\n   * * `emitModelToViewChange`: When true or not supplied  (the default), each change triggers an\n   * `onChange` event to\n   * update the view.\n   * * `emitViewToModelChange`: When true or not supplied (the default), each change triggers an\n   * `ngModelChange`\n   * event to update the model.\n   *\n   */\n  override setValue(value: any, options: {\n    onlySelf?: boolean,\n    emitEvent?: boolean,\n    emitModelToViewChange?: boolean,\n    emitViewToModelChange?: boolean\n  } = {}): void {\n    (this as {value: any}).value = this._pendingValue = value;\n    if (this._onChange.length && options.emitModelToViewChange !== false) {\n      this._onChange.forEach(\n          (changeFn) => changeFn(this.value, options.emitViewToModelChange !== false));\n    }\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Patches the value of a control.\n   *\n   * This function is functionally the same as {@link FormControl#setValue setValue} at this level.\n   * It exists for symmetry with {@link FormGroup#patchValue patchValue} on `FormGroups` and\n   * `FormArrays`, where it does behave differently.\n   *\n   * @see `setValue` for options\n   */\n  override patchValue(value: any, options: {\n    onlySelf?: boolean,\n    emitEvent?: boolean,\n    emitModelToViewChange?: boolean,\n    emitViewToModelChange?: boolean\n  } = {}): void {\n    this.setValue(value, options);\n  }\n\n  /**\n   * Resets the form control, marking it `pristine` and `untouched`, and setting\n   * the value to null.\n   *\n   * @param formState Resets the control with an initial value,\n   * or an object that defines the initial value and disabled state.\n   *\n   * @param options Configuration options that determine how the control propagates changes\n   * and emits events after the value changes.\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is\n   * false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is reset.\n   * When false, no events are emitted.\n   *\n   */\n  override reset(formState: any = null, options: {onlySelf?: boolean, emitEvent?: boolean} = {}):\n      void {\n    this._applyFormState(formState);\n    this.markAsPristine(options);\n    this.markAsUntouched(options);\n    this.setValue(this.value, options);\n    this._pendingChange = false;\n  }\n\n  /**\n   * @internal\n   */\n  override _updateValue() {}\n\n  /**\n   * @internal\n   */\n  override _anyControls(condition: Function): boolean {\n    return false;\n  }\n\n  /**\n   * @internal\n   */\n  override _allControlsDisabled(): boolean {\n    return this.disabled;\n  }\n\n  /**\n   * Register a listener for change events.\n   *\n   * @param fn The method that is called when the value changes\n   */\n  registerOnChange(fn: Function): void {\n    this._onChange.push(fn);\n  }\n\n  /**\n   * Internal function to unregister a change events listener.\n   * @internal\n   */\n  _unregisterOnChange(fn: Function): void {\n    removeListItem(this._onChange, fn);\n  }\n\n  /**\n   * Register a listener for disabled events.\n   *\n   * @param fn The method that is called when the disabled status changes.\n   */\n  registerOnDisabledChange(fn: (isDisabled: boolean) => void): void {\n    this._onDisabledChange.push(fn);\n  }\n\n  /**\n   * Internal function to unregister a disabled event listener.\n   * @internal\n   */\n  _unregisterOnDisabledChange(fn: (isDisabled: boolean) => void): void {\n    removeListItem(this._onDisabledChange, fn);\n  }\n\n  /**\n   * @internal\n   */\n  override _forEachChild(cb: Function): void {}\n\n  /** @internal */\n  override _syncPendingControls(): boolean {\n    if (this.updateOn === 'submit') {\n      if (this._pendingDirty) this.markAsDirty();\n      if (this._pendingTouched) this.markAsTouched();\n      if (this._pendingChange) {\n        this.setValue(this._pendingValue, {onlySelf: true, emitModelToViewChange: false});\n        return true;\n      }\n    }\n    return false;\n  }\n\n  private _applyFormState(formState: any) {\n    if (this._isBoxedValue(formState)) {\n      (this as {value: any}).value = this._pendingValue = formState.value;\n      formState.disabled ? this.disable({onlySelf: true, emitEvent: false}) :\n                           this.enable({onlySelf: true, emitEvent: false});\n    } else {\n      (this as {value: any}).value = this._pendingValue = formState;\n    }\n  }\n}\n\n/**\n * Tracks the value and validity state of a group of `FormControl` instances.\n *\n * A `FormGroup` aggregates the values of each child `FormControl` into one object,\n * with each control name as the key.  It calculates its status by reducing the status values\n * of its children. For example, if one of the controls in a group is invalid, the entire\n * group becomes invalid.\n *\n * `FormGroup` is one of the three fundamental building blocks used to define forms in Angular,\n * along with `FormControl` and `FormArray`.\n *\n * When instantiating a `FormGroup`, pass in a collection of child controls as the first\n * argument. The key for each child registers the name for the control.\n *\n * @usageNotes\n *\n * ### Create a form group with 2 controls\n *\n * ```\n * const form = new FormGroup({\n *   first: new FormControl('Nancy', Validators.minLength(2)),\n *   last: new FormControl('Drew'),\n * });\n *\n * console.log(form.value);   // {first: 'Nancy', last; 'Drew'}\n * console.log(form.status);  // 'VALID'\n * ```\n *\n * ### Create a form group with a group-level validator\n *\n * You include group-level validators as the second arg, or group-level async\n * validators as the third arg. These come in handy when you want to perform validation\n * that considers the value of more than one child control.\n *\n * ```\n * const form = new FormGroup({\n *   password: new FormControl('', Validators.minLength(2)),\n *   passwordConfirm: new FormControl('', Validators.minLength(2)),\n * }, passwordMatchValidator);\n *\n *\n * function passwordMatchValidator(g: FormGroup) {\n *    return g.get('password').value === g.get('passwordConfirm').value\n *       ? null : {'mismatch': true};\n * }\n * ```\n *\n * Like `FormControl` instances, you choose to pass in\n * validators and async validators as part of an options object.\n *\n * ```\n * const form = new FormGroup({\n *   password: new FormControl('')\n *   passwordConfirm: new FormControl('')\n * }, { validators: passwordMatchValidator, asyncValidators: otherValidator });\n * ```\n *\n * ### Set the updateOn property for all controls in a form group\n *\n * The options object is used to set a default value for each child\n * control's `updateOn` property. If you set `updateOn` to `'blur'` at the\n * group level, all child controls default to 'blur', unless the child\n * has explicitly specified a different `updateOn` value.\n *\n * ```ts\n * const c = new FormGroup({\n *   one: new FormControl()\n * }, { updateOn: 'blur' });\n * ```\n *\n * @publicApi\n */\nexport class FormGroup extends AbstractControl {\n  /**\n   * Creates a new `FormGroup` instance.\n   *\n   * @param controls A collection of child controls. The key for each child is the name\n   * under which it is registered.\n   *\n   * @param validatorOrOpts A synchronous validator function, or an array of\n   * such functions, or an `AbstractControlOptions` object that contains validation functions\n   * and a validation trigger.\n   *\n   * @param asyncValidator A single async validator or array of async validator functions\n   *\n   */\n  constructor(\n      public controls: {[key: string]: AbstractControl},\n      validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null,\n      asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null) {\n    super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));\n    this._initObservables();\n    this._setUpdateStrategy(validatorOrOpts);\n    this._setUpControls();\n    this.updateValueAndValidity({\n      onlySelf: true,\n      // If `asyncValidator` is present, it will trigger control status change from `PENDING` to\n      // `VALID` or `INVALID`. The status should be broadcasted via the `statusChanges` observable,\n      // so we set `emitEvent` to `true` to allow that during the control creation process.\n      emitEvent: !!this.asyncValidator\n    });\n  }\n\n  /**\n   * Registers a control with the group's list of controls.\n   *\n   * This method does not update the value or validity of the control.\n   * Use {@link FormGroup#addControl addControl} instead.\n   *\n   * @param name The control name to register in the collection\n   * @param control Provides the control for the given name\n   */\n  registerControl(name: string, control: AbstractControl): AbstractControl {\n    if (this.controls[name]) return this.controls[name];\n    this.controls[name] = control;\n    control.setParent(this);\n    control._registerOnCollectionChange(this._onCollectionChange);\n    return control;\n  }\n\n  /**\n   * Add a control to this group.\n   *\n   * If a control with a given name already exists, it would *not* be replaced with a new one.\n   * If you want to replace an existing control, use the {@link FormGroup#setControl setControl}\n   * method instead. This method also updates the value and validity of the control.\n   *\n   * @param name The control name to add to the collection\n   * @param control Provides the control for the given name\n   * @param options Specifies whether this FormGroup instance should emit events after a new\n   *     control is added.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * added. When false, no events are emitted.\n   */\n  addControl(name: string, control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    this.registerControl(name, control);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Remove a control from this group.\n   *\n   * This method also updates the value and validity of the control.\n   *\n   * @param name The control name to remove from the collection\n   * @param options Specifies whether this FormGroup instance should emit events after a\n   *     control is removed.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * removed. When false, no events are emitted.\n   */\n  removeControl(name: string, options: {emitEvent?: boolean} = {}): void {\n    if (this.controls[name]) this.controls[name]._registerOnCollectionChange(() => {});\n    delete (this.controls[name]);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Replace an existing control.\n   *\n   * If a control with a given name does not exist in this `FormGroup`, it will be added.\n   *\n   * @param name The control name to replace in the collection\n   * @param control Provides the control for the given name\n   * @param options Specifies whether this FormGroup instance should emit events after an\n   *     existing control is replaced.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * replaced with a new one. When false, no events are emitted.\n   */\n  setControl(name: string, control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    if (this.controls[name]) this.controls[name]._registerOnCollectionChange(() => {});\n    delete (this.controls[name]);\n    if (control) this.registerControl(name, control);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Check whether there is an enabled control with the given name in the group.\n   *\n   * Reports false for disabled controls. If you'd like to check for existence in the group\n   * only, use {@link AbstractControl#get get} instead.\n   *\n   * @param controlName The control name to check for existence in the collection\n   *\n   * @returns false for disabled controls, true otherwise.\n   */\n  contains(controlName: string): boolean {\n    return this.controls.hasOwnProperty(controlName) && this.controls[controlName].enabled;\n  }\n\n  /**\n   * Sets the value of the `FormGroup`. It accepts an object that matches\n   * the structure of the group, with control names as keys.\n   *\n   * @usageNotes\n   * ### Set the complete value for the form group\n   *\n   * ```\n   * const form = new FormGroup({\n   *   first: new FormControl(),\n   *   last: new FormControl()\n   * });\n   *\n   * console.log(form.value);   // {first: null, last: null}\n   *\n   * form.setValue({first: 'Nancy', last: 'Drew'});\n   * console.log(form.value);   // {first: 'Nancy', last: 'Drew'}\n   * ```\n   *\n   * @throws When strict checks fail, such as setting the value of a control\n   * that doesn't exist or if you exclude a value of a control that does exist.\n   *\n   * @param value The new value for the control that matches the structure of the group.\n   * @param options Configuration options that determine how the control propagates changes\n   * and emits events after the value changes.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is\n   * false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control value is updated.\n   * When false, no events are emitted.\n   */\n  override setValue(\n      value: {[key: string]: any}, options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._checkAllValuesPresent(value);\n    Object.keys(value).forEach(name => {\n      this._throwIfControlMissing(name);\n      this.controls[name].setValue(value[name], {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Patches the value of the `FormGroup`. It accepts an object with control\n   * names as keys, and does its best to match the values to the correct controls\n   * in the group.\n   *\n   * It accepts both super-sets and sub-sets of the group without throwing an error.\n   *\n   * @usageNotes\n   * ### Patch the value for a form group\n   *\n   * ```\n   * const form = new FormGroup({\n   *    first: new FormControl(),\n   *    last: new FormControl()\n   * });\n   * console.log(form.value);   // {first: null, last: null}\n   *\n   * form.patchValue({first: 'Nancy'});\n   * console.log(form.value);   // {first: 'Nancy', last: null}\n   * ```\n   *\n   * @param value The object that matches the structure of the group.\n   * @param options Configuration options that determine how the control propagates changes and\n   * emits events after the value is patched.\n   * * `onlySelf`: When true, each change only affects this control and not its parent. Default is\n   * true.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control value\n   * is updated. When false, no events are emitted. The configuration options are passed to\n   * the {@link AbstractControl#updateValueAndValidity updateValueAndValidity} method.\n   */\n  override patchValue(\n      value: {[key: string]: any}, options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    // Even though the `value` argument type doesn't allow `null` and `undefined` values, the\n    // `patchValue` can be called recursively and inner data structures might have these values, so\n    // we just ignore such cases when a field containing FormGroup instance receives `null` or\n    // `undefined` as a value.\n    if (value == null /* both `null` and `undefined` */) return;\n\n    Object.keys(value).forEach(name => {\n      if (this.controls[name]) {\n        this.controls[name].patchValue(value[name], {onlySelf: true, emitEvent: options.emitEvent});\n      }\n    });\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Resets the `FormGroup`, marks all descendants `pristine` and `untouched` and sets\n   * the value of all descendants to null.\n   *\n   * You reset to a specific form state by passing in a map of states\n   * that matches the structure of your form, with control names as keys. The state\n   * is a standalone value or a form state object with both a value and a disabled\n   * status.\n   *\n   * @param value Resets the control with an initial value,\n   * or an object that defines the initial value and disabled state.\n   *\n   * @param options Configuration options that determine how the control propagates changes\n   * and emits events when the group is reset.\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is\n   * false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is reset.\n   * When false, no events are emitted.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   *\n   * @usageNotes\n   *\n   * ### Reset the form group values\n   *\n   * ```ts\n   * const form = new FormGroup({\n   *   first: new FormControl('first name'),\n   *   last: new FormControl('last name')\n   * });\n   *\n   * console.log(form.value);  // {first: 'first name', last: 'last name'}\n   *\n   * form.reset({ first: 'name', last: 'last name' });\n   *\n   * console.log(form.value);  // {first: 'name', last: 'last name'}\n   * ```\n   *\n   * ### Reset the form group values and disabled status\n   *\n   * ```\n   * const form = new FormGroup({\n   *   first: new FormControl('first name'),\n   *   last: new FormControl('last name')\n   * });\n   *\n   * form.reset({\n   *   first: {value: 'name', disabled: true},\n   *   last: 'last'\n   * });\n   *\n   * console.log(form.value);  // {last: 'last'}\n   * console.log(form.get('first').status);  // 'DISABLED'\n   * ```\n   */\n  override reset(value: any = {}, options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._forEachChild((control: AbstractControl, name: string) => {\n      control.reset(value[name], {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this._updatePristine(options);\n    this._updateTouched(options);\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * The aggregate value of the `FormGroup`, including any disabled controls.\n   *\n   * Retrieves all values regardless of disabled status.\n   * The `value` property is the best way to get the value of the group, because\n   * it excludes disabled controls in the `FormGroup`.\n   */\n  getRawValue(): any {\n    return this._reduceChildren(\n        {}, (acc: {[k: string]: AbstractControl}, control: AbstractControl, name: string) => {\n          acc[name] = control instanceof FormControl ? control.value : (<any>control).getRawValue();\n          return acc;\n        });\n  }\n\n  /** @internal */\n  override _syncPendingControls(): boolean {\n    let subtreeUpdated = this._reduceChildren(false, (updated: boolean, child: AbstractControl) => {\n      return child._syncPendingControls() ? true : updated;\n    });\n    if (subtreeUpdated) this.updateValueAndValidity({onlySelf: true});\n    return subtreeUpdated;\n  }\n\n  /** @internal */\n  _throwIfControlMissing(name: string): void {\n    if (!Object.keys(this.controls).length) {\n      throw new Error(`\n        There are no form controls registered with this group yet. If you're using ngModel,\n        you may want to check next tick (e.g. use setTimeout).\n      `);\n    }\n    if (!this.controls[name]) {\n      throw new Error(`Cannot find form control with name: ${name}.`);\n    }\n  }\n\n  /** @internal */\n  override _forEachChild(cb: (v: any, k: string) => void): void {\n    Object.keys(this.controls).forEach(key => {\n      // The list of controls can change (for ex. controls might be removed) while the loop\n      // is running (as a result of invoking Forms API in `valueChanges` subscription), so we\n      // have to null check before invoking the callback.\n      const control = this.controls[key];\n      control && cb(control, key);\n    });\n  }\n\n  /** @internal */\n  _setUpControls(): void {\n    this._forEachChild((control: AbstractControl) => {\n      control.setParent(this);\n      control._registerOnCollectionChange(this._onCollectionChange);\n    });\n  }\n\n  /** @internal */\n  override _updateValue(): void {\n    (this as {value: any}).value = this._reduceValue();\n  }\n\n  /** @internal */\n  override _anyControls(condition: Function): boolean {\n    for (const controlName of Object.keys(this.controls)) {\n      const control = this.controls[controlName];\n      if (this.contains(controlName) && condition(control)) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /** @internal */\n  _reduceValue() {\n    return this._reduceChildren(\n        {}, (acc: {[k: string]: AbstractControl}, control: AbstractControl, name: string) => {\n          if (control.enabled || this.disabled) {\n            acc[name] = control.value;\n          }\n          return acc;\n        });\n  }\n\n  /** @internal */\n  _reduceChildren(initValue: any, fn: Function) {\n    let res = initValue;\n    this._forEachChild((control: AbstractControl, name: string) => {\n      res = fn(res, control, name);\n    });\n    return res;\n  }\n\n  /** @internal */\n  override _allControlsDisabled(): boolean {\n    for (const controlName of Object.keys(this.controls)) {\n      if (this.controls[controlName].enabled) {\n        return false;\n      }\n    }\n    return Object.keys(this.controls).length > 0 || this.disabled;\n  }\n\n  /** @internal */\n  _checkAllValuesPresent(value: any): void {\n    this._forEachChild((control: AbstractControl, name: string) => {\n      if (value[name] === undefined) {\n        throw new Error(`Must supply a value for form control with name: '${name}'.`);\n      }\n    });\n  }\n}\n\n/**\n * Tracks the value and validity state of an array of `FormControl`,\n * `FormGroup` or `FormArray` instances.\n *\n * A `FormArray` aggregates the values of each child `FormControl` into an array.\n * It calculates its status by reducing the status values of its children. For example, if one of\n * the controls in a `FormArray` is invalid, the entire array becomes invalid.\n *\n * `FormArray` is one of the three fundamental building blocks used to define forms in Angular,\n * along with `FormControl` and `FormGroup`.\n *\n * @usageNotes\n *\n * ### Create an array of form controls\n *\n * ```\n * const arr = new FormArray([\n *   new FormControl('Nancy', Validators.minLength(2)),\n *   new FormControl('Drew'),\n * ]);\n *\n * console.log(arr.value);   // ['Nancy', 'Drew']\n * console.log(arr.status);  // 'VALID'\n * ```\n *\n * ### Create a form array with array-level validators\n *\n * You include array-level validators and async validators. These come in handy\n * when you want to perform validation that considers the value of more than one child\n * control.\n *\n * The two types of validators are passed in separately as the second and third arg\n * respectively, or together as part of an options object.\n *\n * ```\n * const arr = new FormArray([\n *   new FormControl('Nancy'),\n *   new FormControl('Drew')\n * ], {validators: myValidator, asyncValidators: myAsyncValidator});\n * ```\n *\n * ### Set the updateOn property for all controls in a form array\n *\n * The options object is used to set a default value for each child\n * control's `updateOn` property. If you set `updateOn` to `'blur'` at the\n * array level, all child controls default to 'blur', unless the child\n * has explicitly specified a different `updateOn` value.\n *\n * ```ts\n * const arr = new FormArray([\n *    new FormControl()\n * ], {updateOn: 'blur'});\n * ```\n *\n * ### Adding or removing controls from a form array\n *\n * To change the controls in the array, use the `push`, `insert`, `removeAt` or `clear` methods\n * in `FormArray` itself. These methods ensure the controls are properly tracked in the\n * form's hierarchy. Do not modify the array of `AbstractControl`s used to instantiate\n * the `FormArray` directly, as that result in strange and unexpected behavior such\n * as broken change detection.\n *\n * @publicApi\n */\nexport class FormArray extends AbstractControl {\n  /**\n   * Creates a new `FormArray` instance.\n   *\n   * @param controls An array of child controls. Each child control is given an index\n   * where it is registered.\n   *\n   * @param validatorOrOpts A synchronous validator function, or an array of\n   * such functions, or an `AbstractControlOptions` object that contains validation functions\n   * and a validation trigger.\n   *\n   * @param asyncValidator A single async validator or array of async validator functions\n   *\n   */\n  constructor(\n      public controls: AbstractControl[],\n      validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null,\n      asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null) {\n    super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));\n    this._initObservables();\n    this._setUpdateStrategy(validatorOrOpts);\n    this._setUpControls();\n    this.updateValueAndValidity({\n      onlySelf: true,\n      // If `asyncValidator` is present, it will trigger control status change from `PENDING` to\n      // `VALID` or `INVALID`.\n      // The status should be broadcasted via the `statusChanges` observable, so we set `emitEvent`\n      // to `true` to allow that during the control creation process.\n      emitEvent: !!this.asyncValidator\n    });\n  }\n\n  /**\n   * Get the `AbstractControl` at the given `index` in the array.\n   *\n   * @param index Index in the array to retrieve the control\n   */\n  at(index: number): AbstractControl {\n    return this.controls[index];\n  }\n\n  /**\n   * Insert a new `AbstractControl` at the end of the array.\n   *\n   * @param control Form control to be inserted\n   * @param options Specifies whether this FormArray instance should emit events after a new\n   *     control is added.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * inserted. When false, no events are emitted.\n   */\n  push(control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    this.controls.push(control);\n    this._registerControl(control);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Insert a new `AbstractControl` at the given `index` in the array.\n   *\n   * @param index Index in the array to insert the control\n   * @param control Form control to be inserted\n   * @param options Specifies whether this FormArray instance should emit events after a new\n   *     control is inserted.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * inserted. When false, no events are emitted.\n   */\n  insert(index: number, control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    this.controls.splice(index, 0, control);\n\n    this._registerControl(control);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n  }\n\n  /**\n   * Remove the control at the given `index` in the array.\n   *\n   * @param index Index in the array to remove the control\n   * @param options Specifies whether this FormArray instance should emit events after a\n   *     control is removed.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * removed. When false, no events are emitted.\n   */\n  removeAt(index: number, options: {emitEvent?: boolean} = {}): void {\n    if (this.controls[index]) this.controls[index]._registerOnCollectionChange(() => {});\n    this.controls.splice(index, 1);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n  }\n\n  /**\n   * Replace an existing control.\n   *\n   * @param index Index in the array to replace the control\n   * @param control The `AbstractControl` control to replace the existing control\n   * @param options Specifies whether this FormArray instance should emit events after an\n   *     existing control is replaced with a new one.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control is\n   * replaced with a new one. When false, no events are emitted.\n   */\n  setControl(index: number, control: AbstractControl, options: {emitEvent?: boolean} = {}): void {\n    if (this.controls[index]) this.controls[index]._registerOnCollectionChange(() => {});\n    this.controls.splice(index, 1);\n\n    if (control) {\n      this.controls.splice(index, 0, control);\n      this._registerControl(control);\n    }\n\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n    this._onCollectionChange();\n  }\n\n  /**\n   * Length of the control array.\n   */\n  get length(): number {\n    return this.controls.length;\n  }\n\n  /**\n   * Sets the value of the `FormArray`. It accepts an array that matches\n   * the structure of the control.\n   *\n   * This method performs strict checks, and throws an error if you try\n   * to set the value of a control that doesn't exist or if you exclude the\n   * value of a control.\n   *\n   * @usageNotes\n   * ### Set the values for the controls in the form array\n   *\n   * ```\n   * const arr = new FormArray([\n   *   new FormControl(),\n   *   new FormControl()\n   * ]);\n   * console.log(arr.value);   // [null, null]\n   *\n   * arr.setValue(['Nancy', 'Drew']);\n   * console.log(arr.value);   // ['Nancy', 'Drew']\n   * ```\n   *\n   * @param value Array of values for the controls\n   * @param options Configure options that determine how the control propagates changes and\n   * emits events after the value changes\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default\n   * is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control value is updated.\n   * When false, no events are emitted.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   */\n  override setValue(value: any[], options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._checkAllValuesPresent(value);\n    value.forEach((newValue: any, index: number) => {\n      this._throwIfControlMissing(index);\n      this.at(index).setValue(newValue, {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Patches the value of the `FormArray`. It accepts an array that matches the\n   * structure of the control, and does its best to match the values to the correct\n   * controls in the group.\n   *\n   * It accepts both super-sets and sub-sets of the array without throwing an error.\n   *\n   * @usageNotes\n   * ### Patch the values for controls in a form array\n   *\n   * ```\n   * const arr = new FormArray([\n   *    new FormControl(),\n   *    new FormControl()\n   * ]);\n   * console.log(arr.value);   // [null, null]\n   *\n   * arr.patchValue(['Nancy']);\n   * console.log(arr.value);   // ['Nancy', null]\n   * ```\n   *\n   * @param value Array of latest values for the controls\n   * @param options Configure options that determine how the control propagates changes and\n   * emits events after the value changes\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default\n   * is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when the control value\n   * is updated. When false, no events are emitted. The configuration options are passed to\n   * the {@link AbstractControl#updateValueAndValidity updateValueAndValidity} method.\n   */\n  override patchValue(value: any[], options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    // Even though the `value` argument type doesn't allow `null` and `undefined` values, the\n    // `patchValue` can be called recursively and inner data structures might have these values, so\n    // we just ignore such cases when a field containing FormArray instance receives `null` or\n    // `undefined` as a value.\n    if (value == null /* both `null` and `undefined` */) return;\n\n    value.forEach((newValue: any, index: number) => {\n      if (this.at(index)) {\n        this.at(index).patchValue(newValue, {onlySelf: true, emitEvent: options.emitEvent});\n      }\n    });\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * Resets the `FormArray` and all descendants are marked `pristine` and `untouched`, and the\n   * value of all descendants to null or null maps.\n   *\n   * You reset to a specific form state by passing in an array of states\n   * that matches the structure of the control. The state is a standalone value\n   * or a form state object with both a value and a disabled status.\n   *\n   * @usageNotes\n   * ### Reset the values in a form array\n   *\n   * ```ts\n   * const arr = new FormArray([\n   *    new FormControl(),\n   *    new FormControl()\n   * ]);\n   * arr.reset(['name', 'last name']);\n   *\n   * console.log(arr.value);  // ['name', 'last name']\n   * ```\n   *\n   * ### Reset the values in a form array and the disabled status for the first control\n   *\n   * ```\n   * arr.reset([\n   *   {value: 'name', disabled: true},\n   *   'last'\n   * ]);\n   *\n   * console.log(arr.value);  // ['last']\n   * console.log(arr.at(0).status);  // 'DISABLED'\n   * ```\n   *\n   * @param value Array of values for the controls\n   * @param options Configure options that determine how the control propagates changes and\n   * emits events after the value changes\n   *\n   * * `onlySelf`: When true, each change only affects this control, and not its parent. Default\n   * is false.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges`\n   * observables emit events with the latest status and value when the control is reset.\n   * When false, no events are emitted.\n   * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity\n   * updateValueAndValidity} method.\n   */\n  override reset(value: any = [], options: {onlySelf?: boolean, emitEvent?: boolean} = {}): void {\n    this._forEachChild((control: AbstractControl, index: number) => {\n      control.reset(value[index], {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this._updatePristine(options);\n    this._updateTouched(options);\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * The aggregate value of the array, including any disabled controls.\n   *\n   * Reports all values regardless of disabled status.\n   * For enabled controls only, the `value` property is the best way to get the value of the array.\n   */\n  getRawValue(): any[] {\n    return this.controls.map((control: AbstractControl) => {\n      return control instanceof FormControl ? control.value : (<any>control).getRawValue();\n    });\n  }\n\n  /**\n   * Remove all controls in the `FormArray`.\n   *\n   * @param options Specifies whether this FormArray instance should emit events after all\n   *     controls are removed.\n   * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and\n   * `valueChanges` observables emit events with the latest status and value when all controls\n   * in this FormArray instance are removed. When false, no events are emitted.\n   *\n   * @usageNotes\n   * ### Remove all elements from a FormArray\n   *\n   * ```ts\n   * const arr = new FormArray([\n   *    new FormControl(),\n   *    new FormControl()\n   * ]);\n   * console.log(arr.length);  // 2\n   *\n   * arr.clear();\n   * console.log(arr.length);  // 0\n   * ```\n   *\n   * It's a simpler and more efficient alternative to removing all elements one by one:\n   *\n   * ```ts\n   * const arr = new FormArray([\n   *    new FormControl(),\n   *    new FormControl()\n   * ]);\n   *\n   * while (arr.length) {\n   *    arr.removeAt(0);\n   * }\n   * ```\n   */\n  clear(options: {emitEvent?: boolean} = {}): void {\n    if (this.controls.length < 1) return;\n    this._forEachChild((control: AbstractControl) => control._registerOnCollectionChange(() => {}));\n    this.controls.splice(0);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n  }\n\n  /** @internal */\n  override _syncPendingControls(): boolean {\n    let subtreeUpdated = this.controls.reduce((updated: boolean, child: AbstractControl) => {\n      return child._syncPendingControls() ? true : updated;\n    }, false);\n    if (subtreeUpdated) this.updateValueAndValidity({onlySelf: true});\n    return subtreeUpdated;\n  }\n\n  /** @internal */\n  _throwIfControlMissing(index: number): void {\n    if (!this.controls.length) {\n      throw new Error(`\n        There are no form controls registered with this array yet. If you're using ngModel,\n        you may want to check next tick (e.g. use setTimeout).\n      `);\n    }\n    if (!this.at(index)) {\n      throw new Error(`Cannot find form control at index ${index}`);\n    }\n  }\n\n  /** @internal */\n  override _forEachChild(cb: Function): void {\n    this.controls.forEach((control: AbstractControl, index: number) => {\n      cb(control, index);\n    });\n  }\n\n  /** @internal */\n  override _updateValue(): void {\n    (this as {value: any}).value =\n        this.controls.filter((control) => control.enabled || this.disabled)\n            .map((control) => control.value);\n  }\n\n  /** @internal */\n  override _anyControls(condition: Function): boolean {\n    return this.controls.some((control: AbstractControl) => control.enabled && condition(control));\n  }\n\n  /** @internal */\n  _setUpControls(): void {\n    this._forEachChild((control: AbstractControl) => this._registerControl(control));\n  }\n\n  /** @internal */\n  _checkAllValuesPresent(value: any): void {\n    this._forEachChild((control: AbstractControl, i: number) => {\n      if (value[i] === undefined) {\n        throw new Error(`Must supply a value for form control at index: ${i}.`);\n      }\n    });\n  }\n\n  /** @internal */\n  override _allControlsDisabled(): boolean {\n    for (const control of this.controls) {\n      if (control.enabled) return false;\n    }\n    return this.controls.length > 0 || this.disabled;\n  }\n\n  private _registerControl(control: AbstractControl) {\n    control.setParent(this);\n    control._registerOnCollectionChange(this._onCollectionChange);\n  }\n}\n"]}