/**
 * @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, ɵRuntimeError as RuntimeError } from '@angular/core';
import { asyncValidatorsDroppedWithOptsWarning, missingControlError, missingControlValueError, noControlsError } from '../directives/reactive_errors';
import { addValidators, composeAsyncValidators, composeValidators, hasValidator, removeValidators, toObservable } from '../validators';
const NG_DEV_MODE = typeof ngDevMode === 'undefined' || !!ngDevMode;
/**
 * Reports that a control is valid, meaning that no errors exist in the input value.
 *
 * @see `status`
 */
export const VALID = 'VALID';
/**
 * Reports that a control is invalid, meaning that an error exists in the input value.
 *
 * @see `status`
 */
export const INVALID = 'INVALID';
/**
 * Reports that a control 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 control is disabled, meaning that the control is exempt from ancestor
 * calculations of validity or value.
 *
 * @see `markAsDisabled`
 * @see `status`
 */
export const DISABLED = 'DISABLED';
/**
 * Gets validators from either an options object or given validators.
 */
export 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.
 */
export function pickAsyncValidators(asyncValidator, validatorOrOpts) {
    if (typeof ngDevMode === 'undefined' || ngDevMode) {
        if (isOptionsObj(validatorOrOpts) && asyncValidator) {
            console.warn(asyncValidatorsDroppedWithOptsWarning);
        }
    }
    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;
}
export function isOptionsObj(validatorOrOpts) {
    return validatorOrOpts != null && !Array.isArray(validatorOrOpts) &&
        typeof validatorOrOpts === 'object';
}
export function assertControlPresent(parent, isGroup, key) {
    const controls = parent.controls;
    const collection = isGroup ? Object.keys(controls) : controls;
    if (!collection.length) {
        throw new RuntimeError(1000 /* RuntimeErrorCode.NO_CONTROLS */, NG_DEV_MODE ? noControlsError(isGroup) : '');
    }
    if (!controls[key]) {
        throw new RuntimeError(1001 /* RuntimeErrorCode.MISSING_CONTROL */, NG_DEV_MODE ? missingControlError(isGroup, key) : '');
    }
}
export function assertAllValuesPresent(control, isGroup, value) {
    control._forEachChild((_, key) => {
        if (value[key] === undefined) {
            throw new RuntimeError(1002 /* RuntimeErrorCode.MISSING_CONTROL_VALUE */, NG_DEV_MODE ? missingControlValueError(isGroup, key) : '');
        }
    });
}
// clang-format on
/**
 * 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.
 *
 * The first type parameter TValue represents the value type of the control (`control.value`).
 * The optional type parameter TRawValue  represents the raw value type (`control.getRawValue()`).
 *
 * @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) {
        /** @internal */
        this._pendingDirty = false;
        /**
         * Indicates that a control has its own pending asynchronous validation in progress.
         *
         * @internal
         */
        this._hasOwnPendingAsyncValidator = false;
        /** @internal */
        this._pendingTouched = 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.
     *
     * @usageNotes
     *
     * ### Reference to a ValidatorFn
     *
     * ```
     * // Reference to the RequiredValidator
     * const ctrl = new FormControl<string | null>('', Validators.required);
     * ctrl.removeValidators(Validators.required);
     *
     * // Reference to anonymous function inside MinValidator
     * const minValidator = Validators.min(3);
     * const ctrl = new FormControl<string | null>('', minValidator);
     * expect(ctrl.hasValidator(minValidator)).toEqual(true)
     * expect(ctrl.hasValidator(Validators.min(3)).toEqual(false)
     *
     * ctrl.removeValidators(minValidator);
     * ```
     *
     * 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.
     *
     * @usageNotes
     *
     * ### Reference to a ValidatorFn
     *
     * ```
     * // Reference to the RequiredValidator
     * const ctrl = new FormControl<number | null>(0, Validators.required);
     * expect(ctrl.hasValidator(Validators.required)).toEqual(true)
     *
     * // Reference to anonymous function inside MinValidator
     * const minValidator = Validators.min(3);
     * const ctrl = new FormControl<number | null>(0, minValidator);
     * expect(ctrl.hasValidator(minValidator)).toEqual(true)
     * expect(ctrl.hasValidator(Validators.min(3)).toEqual(false)
     * ```
     *
     * @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({ ...opts, onlySelf: true });
        });
        this._updateValue();
        if (opts.emitEvent !== false) {
            this.valueChanges.emit(this.value);
            this.statusChanges.emit(this.status);
        }
        this._updateAncestors({ ...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({ ...opts, onlySelf: true });
        });
        this.updateValueAndValidity({ onlySelf: true, emitEvent: opts.emitEvent });
        this._updateAncestors({ ...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();
        }
    }
    /**
     * Sets the parent of the control
     *
     * @param parent The new parent.
     */
    setParent(parent) {
        this._parent = parent;
    }
    /**
     * The raw value of this control. For most control implementations, the raw value will include
     * disabled children.
     */
    getRawValue() {
        return this.value;
    }
    /**
     * 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.
     *
     * @param opts Configuration options that determine how the control propagates
     * changes and emits events after the control errors are set.
     * * `emitEvent`: When true or not supplied (the default), the `statusChanges`
     * observable emits an event after the errors are set.
     *
     * @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. If a string is provided, passing it as a string literal will result in improved type
     * information. Likewise, if an array is provided, passing it `as const` will cause improved type
     * information to be available.
     *
     * @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'] as const);` // `as const` gives improved typings
     *
     * ### 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) {
        let currPath = path;
        if (currPath == null)
            return null;
        if (!Array.isArray(currPath))
            currPath = currPath.split('.');
        if (currPath.length === 0)
            return null;
        return currPath.reduce((control, name) => control && control._find(name), this);
    }
    /**
     * @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 */
    _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();
    }
    /** @internal */
    _find(name) {
        return null;
    }
}
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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, ɵRuntimeError as RuntimeError} from '@angular/core';\nimport {Observable} from 'rxjs';\n\nimport {asyncValidatorsDroppedWithOptsWarning, missingControlError, missingControlValueError, noControlsError} from '../directives/reactive_errors';\nimport {AsyncValidatorFn, ValidationErrors, ValidatorFn} from '../directives/validators';\nimport {RuntimeErrorCode} from '../errors';\nimport {FormArray, FormGroup} from '../forms';\nimport {addValidators, composeAsyncValidators, composeValidators, hasValidator, removeValidators, toObservable} from '../validators';\n\nconst NG_DEV_MODE = typeof ngDevMode === 'undefined' || !!ngDevMode;\n\n/**\n * Reports that a control 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 control 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 control 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 control 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\n/**\n * A form can have several different statuses. Each\n * possible status is returned as a string literal.\n *\n * * **VALID**: Reports that a control is valid, meaning that no errors exist in the input\n * value.\n * * **INVALID**: Reports that a control is invalid, meaning that an error exists in the input\n * value.\n * * **PENDING**: Reports that a control is pending, meaning that that async validation is\n * occurring and errors are not yet available for the input value.\n * * **DISABLED**: Reports that a control is\n * disabled, meaning that the control is exempt from ancestor calculations of validity or value.\n *\n * @publicApi\n */\nexport type FormControlStatus = 'VALID'|'INVALID'|'PENDING'|'DISABLED';\n\n/**\n * Gets validators from either an options object or given validators.\n */\nexport function 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 */\nexport function pickAsyncValidators(\n    asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null,\n    validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null): AsyncValidatorFn|\n    AsyncValidatorFn[]|null {\n  if (typeof ngDevMode === 'undefined' || ngDevMode) {\n    if (isOptionsObj(validatorOrOpts) && asyncValidator) {\n      console.warn(asyncValidatorsDroppedWithOptsWarning);\n    }\n  }\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\nexport function isOptionsObj(validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|\n                             null): validatorOrOpts is AbstractControlOptions {\n  return validatorOrOpts != null && !Array.isArray(validatorOrOpts) &&\n      typeof validatorOrOpts === 'object';\n}\n\nexport function assertControlPresent(parent: any, isGroup: boolean, key: string|number): void {\n  const controls = parent.controls as {[key: string|number]: unknown};\n  const collection = isGroup ? Object.keys(controls) : controls;\n  if (!collection.length) {\n    throw new RuntimeError(\n        RuntimeErrorCode.NO_CONTROLS, NG_DEV_MODE ? noControlsError(isGroup) : '');\n  }\n  if (!controls[key]) {\n    throw new RuntimeError(\n        RuntimeErrorCode.MISSING_CONTROL, NG_DEV_MODE ? missingControlError(isGroup, key) : '');\n  }\n}\n\nexport function assertAllValuesPresent(control: any, isGroup: boolean, value: any): void {\n  control._forEachChild((_: unknown, key: string|number) => {\n    if (value[key] === undefined) {\n      throw new RuntimeError(\n          RuntimeErrorCode.MISSING_CONTROL_VALUE,\n          NG_DEV_MODE ? missingControlValueError(isGroup, key) : '');\n    }\n  });\n}\n\n// IsAny checks if T is `any`, by checking a condition that couldn't possibly be true otherwise.\nexport type ɵIsAny<T, Y, N> = 0 extends(1&T) ? Y : N;\n\n/**\n * `TypedOrUntyped` allows one of two different types to be selected, depending on whether the Forms\n * class it's applied to is typed or not.\n *\n * This is for internal Angular usage to support typed forms; do not directly use it.\n */\nexport type ɵTypedOrUntyped<T, Typed, Untyped> = ɵIsAny<T, Untyped, Typed>;\n\n/**\n * Value gives the value type corresponding to a control type.\n *\n * Note that the resulting type will follow the same rules as `.value` on your control, group, or\n * array, including `undefined` for each group element which might be disabled.\n *\n * If you are trying to extract a value type for a data model, you probably want {@link RawValue},\n * which will not have `undefined` in group keys.\n *\n * @usageNotes\n *\n * ### `FormControl` value type\n *\n * You can extract the value type of a single control:\n *\n * ```ts\n * type NameControl = FormControl<string>;\n * type NameValue = Value<NameControl>;\n * ```\n *\n * The resulting type is `string`.\n *\n * ### `FormGroup` value type\n *\n * Imagine you have an interface defining the controls in your group. You can extract the shape of\n * the values as follows:\n *\n * ```ts\n * interface PartyFormControls {\n *   address: FormControl<string>;\n * }\n *\n * // Value operates on controls; the object must be wrapped in a FormGroup.\n * type PartyFormValues = Value<FormGroup<PartyFormControls>>;\n * ```\n *\n * The resulting type is `{address: string|undefined}`.\n *\n * ### `FormArray` value type\n *\n * You can extract values from FormArrays as well:\n *\n * ```ts\n * type GuestNamesControls = FormArray<FormControl<string>>;\n *\n * type NamesValues = Value<GuestNamesControls>;\n * ```\n *\n * The resulting type is `string[]`.\n *\n * **Internal: not for public use.**\n */\nexport type ɵValue<T extends AbstractControl|undefined> =\n    T extends AbstractControl<any, any>? T['value'] : never;\n\n/**\n * RawValue gives the raw value type corresponding to a control type.\n *\n * Note that the resulting type will follow the same rules as `.getRawValue()` on your control,\n * group, or array. This means that all controls inside a group will be required, not optional,\n * regardless of their disabled state.\n *\n * You may also wish to use {@link ɵValue}, which will have `undefined` in group keys (which can be\n * disabled).\n *\n * @usageNotes\n *\n * ### `FormGroup` raw value type\n *\n * Imagine you have an interface defining the controls in your group. You can extract the shape of\n * the raw values as follows:\n *\n * ```ts\n * interface PartyFormControls {\n *   address: FormControl<string>;\n * }\n *\n * // RawValue operates on controls; the object must be wrapped in a FormGroup.\n * type PartyFormValues = RawValue<FormGroup<PartyFormControls>>;\n * ```\n *\n * The resulting type is `{address: string}`. (Note the absence of `undefined`.)\n *\n *  **Internal: not for public use.**\n */\nexport type ɵRawValue<T extends AbstractControl|undefined> = T extends AbstractControl<any, any>?\n    (T['setValue'] extends((v: infer R) => void) ? R : never) :\n    never;\n\n// Disable clang-format to produce clearer formatting for these multiline types.\n// clang-format off\n\n/**\n * Tokenize splits a string literal S by a delimiter D.\n */\nexport type ɵTokenize<S extends string, D extends string> =\n  string extends S ? string[] : /* S must be a literal */\n    S extends `${infer T}${D}${infer U}` ? [T, ...ɵTokenize<U, D>] :\n      [S] /* Base case */\n  ;\n\n/**\n * CoerceStrArrToNumArr accepts an array of strings, and converts any numeric string to a number.\n */\nexport type ɵCoerceStrArrToNumArr<S> =\n// Extract the head of the array.\n  S extends [infer Head, ...infer Tail] ?\n    // Using a template literal type, coerce the head to `number` if possible.\n    // Then, recurse on the tail.\n    Head extends `${number}` ?\n      [number, ...ɵCoerceStrArrToNumArr<Tail>] :\n      [Head, ...ɵCoerceStrArrToNumArr<Tail>] :\n    [];\n\n/**\n * Navigate takes a type T and an array K, and returns the type of T[K[0]][K[1]][K[2]]...\n */\nexport type ɵNavigate<T, K extends(Array<string|number>)> =\n  T extends object ? /* T must be indexable (object or array) */\n    (K extends [infer Head, ...infer Tail] ? /* Split K into head and tail */\n      (Head extends keyof T ? /* head(K) must index T */\n        (Tail extends(string|number)[] ? /* tail(K) must be an array */\n          [] extends Tail ? T[Head] : /* base case: K can be split, but Tail is empty */\n            (ɵNavigate<T[Head], Tail>) /* explore T[head(K)] by tail(K) */ :\n          any) /* tail(K) was not an array, give up */ :\n        never) /* head(K) does not index T, give up */ :\n      any) /* K cannot be split, give up */ :\n    any /* T is not indexable, give up */\n  ;\n\n/**\n * ɵWriteable removes readonly from all keys.\n */\nexport type ɵWriteable<T> = {\n  -readonly[P in keyof T]: T[P]\n};\n\n/**\n * GetProperty takes a type T and some property names or indices K.\n * If K is a dot-separated string, it is tokenized into an array before proceeding.\n * Then, the type of the nested property at K is computed: T[K[0]][K[1]][K[2]]...\n * This works with both objects, which are indexed by property name, and arrays, which are indexed\n * numerically.\n *\n * For internal use only.\n */\nexport type ɵGetProperty<T, K> =\n    // K is a string\n    K extends string ? ɵGetProperty<T, ɵCoerceStrArrToNumArr<ɵTokenize<K, '.'>>> :\n    // Is is an array\n    ɵWriteable<K> extends Array<string|number> ? ɵNavigate<T, ɵWriteable<K>> :\n    // Fall through permissively if we can't calculate the type of K.\n    any;\n\n// clang-format on\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 * The first type parameter TValue represents the value type of the control (`control.value`).\n * The optional type parameter TRawValue  represents the raw value type (`control.getRawValue()`).\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<TValue = any, TRawValue extends TValue = TValue> {\n  /** @internal */\n  _pendingDirty = false;\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  _pendingTouched = false;\n\n  /** @internal */\n  _onCollectionChange = () => {};\n\n  /** @internal */\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!: TValue;\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.\n   *\n   * @see `FormControlStatus`\n   *\n   * These status values are mutually exclusive, so a control cannot be\n   * both valid AND invalid or invalid AND disabled.\n   */\n  public readonly status!: FormControlStatus;\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  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  public readonly valueChanges!: Observable<TValue>;\n\n  /**\n   * A multicasting observable that emits an event every time the validation `status` of the control\n   * recalculates.\n   *\n   * @see `FormControlStatus`\n   * @see {@link AbstractControl.status}\n   *\n   */\n  public readonly statusChanges!: Observable<FormControlStatus>;\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   * @usageNotes\n   *\n   * ### Reference to a ValidatorFn\n   *\n   * ```\n   * // Reference to the RequiredValidator\n   * const ctrl = new FormControl<string | null>('', Validators.required);\n   * ctrl.removeValidators(Validators.required);\n   *\n   * // Reference to anonymous function inside MinValidator\n   * const minValidator = Validators.min(3);\n   * const ctrl = new FormControl<string | null>('', minValidator);\n   * expect(ctrl.hasValidator(minValidator)).toEqual(true)\n   * expect(ctrl.hasValidator(Validators.min(3)).toEqual(false)\n   *\n   * ctrl.removeValidators(minValidator);\n   * ```\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   * @usageNotes\n   *\n   * ### Reference to a ValidatorFn\n   *\n   * ```\n   * // Reference to the RequiredValidator\n   * const ctrl = new FormControl<number | null>(0, Validators.required);\n   * expect(ctrl.hasValidator(Validators.required)).toEqual(true)\n   *\n   * // Reference to anonymous function inside MinValidator\n   * const minValidator = Validators.min(3);\n   * const ctrl = new FormControl<number | null>(0, minValidator);\n   * expect(ctrl.hasValidator(minValidator)).toEqual(true)\n   * expect(ctrl.hasValidator(Validators.min(3)).toEqual(false)\n   * ```\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: FormControlStatus}).status = PENDING;\n\n    if (opts.emitEvent !== false) {\n      (this.statusChanges as EventEmitter<FormControlStatus>).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: FormControlStatus}).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<TValue>).emit(this.value);\n      (this.statusChanges as EventEmitter<FormControlStatus>).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: FormControlStatus}).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}): void {\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   * Sets the parent of the control\n   *\n   * @param parent The new parent.\n   */\n  setParent(parent: FormGroup|FormArray|null): 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: TRawValue, options?: Object): void;\n\n  /**\n   * Patches the value of the control. Abstract method (implemented in sub-classes).\n   */\n  abstract patchValue(value: TValue, options?: Object): void;\n\n  /**\n   * Resets the control. Abstract method (implemented in sub-classes).\n   */\n  abstract reset(value?: TValue, options?: Object): void;\n\n  /**\n   * The raw value of this control. For most control implementations, the raw value will include\n   * disabled children.\n   */\n  getRawValue(): any {\n    return this.value;\n  }\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: FormControlStatus}).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<TValue>).emit(this.value);\n      (this.statusChanges as EventEmitter<FormControlStatus>).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}): void {\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: FormControlStatus}).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: FormControlStatus}).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   * @param opts Configuration options that determine how the control propagates\n   * changes and emits events after the control errors are set.\n   * * `emitEvent`: When true or not supplied (the default), the `statusChanges`\n   * observable emits an event after the errors are set.\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   * This signature for get supports strings and `const` arrays (`.get(['foo', 'bar'] as const)`).\n   */\n  get<P extends string|(readonly(string|number)[])>(path: P):\n      AbstractControl<ɵGetProperty<TRawValue, P>>|null;\n\n  /**\n   * Retrieves a child control given the control's name or path.\n   *\n   * This signature for `get` supports non-const (mutable) arrays. Inferred type\n   * information will not be as robust, so prefer to pass a `readonly` array if possible.\n   */\n  get<P extends string|Array<string|number>>(path: P):\n      AbstractControl<ɵGetProperty<TRawValue, P>>|null;\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. If a string is provided, passing it as a string literal will result in improved type\n   * information. Likewise, if an array is provided, passing it `as const` will cause improved type\n   * information to be available.\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'] as const);` // `as const` gives improved typings\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<P extends string|((string | number)[])>(path: P):\n      AbstractControl<ɵGetProperty<TRawValue, P>>|null {\n    let currPath: Array<string|number>|string = path;\n    if (currPath == null) return null;\n    if (!Array.isArray(currPath)) currPath = currPath.split('.');\n    if (currPath.length === 0) return null;\n    return currPath.reduce(\n        (control: AbstractControl|null, name) => control && control._find(name), this);\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: FormControlStatus}).status = this._calculateStatus();\n\n    if (emitEvent) {\n      (this.statusChanges as EventEmitter<FormControlStatus>).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<TValue>}).valueChanges = new EventEmitter();\n    (this as {statusChanges: Observable<FormControlStatus>}).statusChanges = new EventEmitter();\n  }\n\n\n  private _calculateStatus(): FormControlStatus {\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: (c: AbstractControl) => void): void;\n\n  /** @internal */\n  abstract _anyControls(condition: (c: AbstractControl) => boolean): boolean;\n\n  /** @internal */\n  abstract _allControlsDisabled(): boolean;\n\n  /** @internal */\n  abstract _syncPendingControls(): boolean;\n\n  /** @internal */\n  _anyControlsHaveStatus(status: FormControlStatus): 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: Array<(isDisabled: boolean) => void> = [];\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   * 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  /** @internal */\n  _find(name: string|number): AbstractControl|null {\n    return null;\n  }\n}\n"]}