@angular/forms/esm2022/src/model/form_array.mjs

/**
 * @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 { AbstractControl, assertAllValuesPresent, assertControlPresent, pickAsyncValidators, pickValidators, } from './abstract_model';
/**
 * 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` accepts one generic argument, which is the type of the controls inside.
 * If you need a heterogenous array, use {@link UntypedFormArray}.
 *
 * `FormArray` is one of the four fundamental building blocks used to define forms in Angular,
 * along with `FormControl`, `FormGroup`, and `FormRecord`.
 *
 * @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. If `index` is negative, it will wrap
     *     around from the back, and if index is greatly negative (less than `-length`), the result is
     * undefined. This behavior is the same as `Array.at(index)`.
     */
    at(index) {
        return this.controls[this._adjustIndex(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. If `index` is negative, wraps around
     *     from the back. If `index` is greatly negative (less than `-length`), prepends to the array.
     * This behavior is the same as `Array.splice(index, 0, 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.  If `index` is negative, wraps around
     *     from the back. If `index` is greatly negative (less than `-length`), removes the first
     *     element. This behavior is the same as `Array.splice(index, 1)`.
     * @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 = {}) {
        // Adjust the index, then clamp it at no less than 0 to prevent undesired underflows.
        let adjustedIndex = this._adjustIndex(index);
        if (adjustedIndex < 0)
            adjustedIndex = 0;
        if (this.controls[adjustedIndex])
            this.controls[adjustedIndex]._registerOnCollectionChange(() => { });
        this.controls.splice(adjustedIndex, 1);
        this.updateValueAndValidity({ emitEvent: options.emitEvent });
    }
    /**
     * Replace an existing control.
     *
     * @param index Index in the array to replace the control. If `index` is negative, wraps around
     *     from the back. If `index` is greatly negative (less than `-length`), replaces the first
     *     element. This behavior is the same as `Array.splice(index, 1, 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 = {}) {
        // Adjust the index, then clamp it at no less than 0 to prevent undesired underflows.
        let adjustedIndex = this._adjustIndex(index);
        if (adjustedIndex < 0)
            adjustedIndex = 0;
        if (this.controls[adjustedIndex])
            this.controls[adjustedIndex]._registerOnCollectionChange(() => { });
        this.controls.splice(adjustedIndex, 1);
        if (control) {
            this.controls.splice(adjustedIndex, 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 = {}) {
        assertAllValuesPresent(this, false, value);
        value.forEach((newValue, index) => {
            assertControlPresent(this, false, 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);
        this._updateTouched(options, this);
        this.updateValueAndValidity(options);
    }
    /**
     * The aggregate value of the array, including any disabled controls.
     *
     * Reports all values regardless of disabled status.
     */
    getRawValue() {
        return this.controls.map((control) => 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 });
    }
    /**
     * Adjusts a negative index by summing it with the length of the array. For very negative
     * indices, the result may remain negative.
     * @internal
     */
    _adjustIndex(index) {
        return index < 0 ? index + this.length : index;
    }
    /** @internal */
    _syncPendingControls() {
        let subtreeUpdated = this.controls.reduce((updated, child) => {
            return child._syncPendingControls() ? true : updated;
        }, false);
        if (subtreeUpdated)
            this.updateValueAndValidity({ onlySelf: true });
        return subtreeUpdated;
    }
    /** @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 */
    _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);
    }
    /** @internal */
    _find(name) {
        return this.at(name) ?? null;
    }
}
export const UntypedFormArray = FormArray;
/**
 * @description
 * Asserts that the given control is an instance of `FormArray`
 *
 * @publicApi
 */
export const isFormArray = (control) => control instanceof FormArray;
//# 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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 {ɵWritable as Writable} from '@angular/core';\n\nimport {AsyncValidatorFn, ValidatorFn} from '../directives/validators';\n\nimport {\n  AbstractControl,\n  AbstractControlOptions,\n  assertAllValuesPresent,\n  assertControlPresent,\n  pickAsyncValidators,\n  pickValidators,\n  ɵRawValue,\n  ɵTypedOrUntyped,\n  ɵValue,\n} from './abstract_model';\n\n/**\n * FormArrayValue extracts the type of `.value` from a FormArray's element type, and wraps it in an\n * array.\n *\n * Angular uses this type internally to support Typed Forms; do not use it directly. The untyped\n * case falls back to any[].\n */\nexport type ɵFormArrayValue<T extends AbstractControl<any>> = ɵTypedOrUntyped<\n  T,\n  Array<ɵValue<T>>,\n  any[]\n>;\n\n/**\n * FormArrayRawValue extracts the type of `.getRawValue()` from a FormArray's element type, and\n * wraps it in an array. The untyped case falls back to any[].\n *\n * Angular uses this type internally to support Typed Forms; do not use it directly.\n */\nexport type ɵFormArrayRawValue<T extends AbstractControl<any>> = ɵTypedOrUntyped<\n  T,\n  Array<ɵRawValue<T>>,\n  any[]\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` accepts one generic argument, which is the type of the controls inside.\n * If you need a heterogenous array, use {@link UntypedFormArray}.\n *\n * `FormArray` is one of the four fundamental building blocks used to define forms in Angular,\n * along with `FormControl`, `FormGroup`, and `FormRecord`.\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<TControl extends AbstractControl<any> = any> extends AbstractControl<\n  ɵTypedOrUntyped<TControl, ɵFormArrayValue<TControl>, any>,\n  ɵTypedOrUntyped<TControl, ɵFormArrayRawValue<TControl>, any>\n> {\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    controls: Array<TControl>,\n    validatorOrOpts?: ValidatorFn | ValidatorFn[] | AbstractControlOptions | null,\n    asyncValidator?: AsyncValidatorFn | AsyncValidatorFn[] | null,\n  ) {\n    super(pickValidators(validatorOrOpts), pickAsyncValidators(asyncValidator, validatorOrOpts));\n    this.controls = controls;\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  public controls: ɵTypedOrUntyped<TControl, Array<TControl>, Array<AbstractControl<any>>>;\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. If `index` is negative, it will wrap\n   *     around from the back, and if index is greatly negative (less than `-length`), the result is\n   * undefined. This behavior is the same as `Array.at(index)`.\n   */\n  at(index: number): ɵTypedOrUntyped<TControl, TControl, AbstractControl<any>> {\n    return (this.controls as any)[this._adjustIndex(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: TControl, 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. If `index` is negative, wraps around\n   *     from the back. If `index` is greatly negative (less than `-length`), prepends to the array.\n   * This behavior is the same as `Array.splice(index, 0, 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: TControl, 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.  If `index` is negative, wraps around\n   *     from the back. If `index` is greatly negative (less than `-length`), removes the first\n   *     element. This behavior is the same as `Array.splice(index, 1)`.\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    // Adjust the index, then clamp it at no less than 0 to prevent undesired underflows.\n    let adjustedIndex = this._adjustIndex(index);\n    if (adjustedIndex < 0) adjustedIndex = 0;\n\n    if (this.controls[adjustedIndex])\n      this.controls[adjustedIndex]._registerOnCollectionChange(() => {});\n    this.controls.splice(adjustedIndex, 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. If `index` is negative, wraps around\n   *     from the back. If `index` is greatly negative (less than `-length`), replaces the first\n   *     element. This behavior is the same as `Array.splice(index, 1, 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: TControl, options: {emitEvent?: boolean} = {}): void {\n    // Adjust the index, then clamp it at no less than 0 to prevent undesired underflows.\n    let adjustedIndex = this._adjustIndex(index);\n    if (adjustedIndex < 0) adjustedIndex = 0;\n\n    if (this.controls[adjustedIndex])\n      this.controls[adjustedIndex]._registerOnCollectionChange(() => {});\n    this.controls.splice(adjustedIndex, 1);\n\n    if (control) {\n      this.controls.splice(adjustedIndex, 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(\n    value: ɵFormArrayRawValue<TControl>,\n    options: {\n      onlySelf?: boolean;\n      emitEvent?: boolean;\n    } = {},\n  ): void {\n    assertAllValuesPresent(this, false, value);\n    value.forEach((newValue: any, index: number) => {\n      assertControlPresent(this, false, 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\n   * value 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: ɵFormArrayValue<TControl>,\n    options: {\n      onlySelf?: boolean;\n      emitEvent?: boolean;\n    } = {},\n  ): 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,\n    // so 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, index) => {\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(\n    value: ɵTypedOrUntyped<TControl, ɵFormArrayValue<TControl>, any> = [],\n    options: {\n      onlySelf?: boolean;\n      emitEvent?: boolean;\n    } = {},\n  ): void {\n    this._forEachChild((control: AbstractControl, index: number) => {\n      control.reset(value[index], {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this._updatePristine(options, this);\n    this._updateTouched(options, this);\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   */\n  override getRawValue(): ɵFormArrayRawValue<TControl> {\n    return this.controls.map((control: AbstractControl) => control.getRawValue());\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) => control._registerOnCollectionChange(() => {}));\n    this.controls.splice(0);\n    this.updateValueAndValidity({emitEvent: options.emitEvent});\n  }\n\n  /**\n   * Adjusts a negative index by summing it with the length of the array. For very negative\n   * indices, the result may remain negative.\n   * @internal\n   */\n  private _adjustIndex(index: number): number {\n    return index < 0 ? index + this.length : index;\n  }\n\n  /** @internal */\n  override _syncPendingControls(): boolean {\n    let subtreeUpdated = (this.controls as any).reduce((updated: any, child: any) => {\n      return child._syncPendingControls() ? true : updated;\n    }, false);\n    if (subtreeUpdated) this.updateValueAndValidity({onlySelf: true});\n    return subtreeUpdated;\n  }\n\n  /** @internal */\n  override _forEachChild(cb: (c: AbstractControl, index: number) => void): 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 Writable<this>).value = this.controls\n      .filter((control) => control.enabled || this.disabled)\n      .map((control) => control.value);\n  }\n\n  /** @internal */\n  override _anyControls(condition: (c: AbstractControl) => boolean): boolean {\n    return this.controls.some((control) => control.enabled && condition(control));\n  }\n\n  /** @internal */\n  _setUpControls(): void {\n    this._forEachChild((control) => this._registerControl(control));\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  /** @internal */\n  override _find(name: string | number): AbstractControl | null {\n    return this.at(name as number) ?? null;\n  }\n}\n\ninterface UntypedFormArrayCtor {\n  new (\n    controls: AbstractControl[],\n    validatorOrOpts?: ValidatorFn | ValidatorFn[] | AbstractControlOptions | null,\n    asyncValidator?: AsyncValidatorFn | AsyncValidatorFn[] | null,\n  ): UntypedFormArray;\n\n  /**\n   * The presence of an explicit `prototype` property provides backwards-compatibility for apps that\n   * manually inspect the prototype chain.\n   */\n  prototype: FormArray<any>;\n}\n\n/**\n * UntypedFormArray is a non-strongly-typed version of `FormArray`, which\n * permits heterogenous controls.\n */\nexport type UntypedFormArray = FormArray<any>;\n\nexport const UntypedFormArray: UntypedFormArrayCtor = FormArray;\n\n/**\n * @description\n * Asserts that the given control is an instance of `FormArray`\n *\n * @publicApi\n */\nexport const isFormArray = (control: unknown): control is FormArray => control instanceof FormArray;\n"]}