/** * @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._updateTouched(options); 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 {AsyncValidatorFn, ValidatorFn} from '../directives/validators';\n\nimport {AbstractControl, AbstractControlOptions, assertAllValuesPresent, assertControlPresent, pickAsyncValidators, pickValidators, ɵRawValue, ɵTypedOrUntyped, ɵValue} 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>> =\n    ɵTypedOrUntyped<T, Array<ɵValue<T>>, any[]>;\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>> =\n    ɵTypedOrUntyped<T, Array<ɵRawValue<T>>, any[]>;\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   * 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    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(value: ɵFormArrayRawValue<TControl>, options: {\n    onlySelf?: boolean,\n    emitEvent?: boolean\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(value: ɵFormArrayValue<TControl>, options: {\n    onlySelf?: boolean,\n    emitEvent?: boolean\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(value: ɵTypedOrUntyped<TControl, ɵFormArrayValue<TControl>, any> = [], options: {\n    onlySelf?: boolean,\n    emitEvent?: boolean\n  } = {}): void {\n    this._forEachChild((control: AbstractControl, index: number) => {\n      control.reset(value[index], {onlySelf: true, emitEvent: options.emitEvent});\n    });\n    this._updatePristine(options);\n    this._updateTouched(options);\n    this.updateValueAndValidity(options);\n  }\n\n  /**\n   * The aggregate value of the array, including any disabled controls.\n   *\n   * Reports all values regardless of disabled status.\n   */\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 {value: any}).value =\n        this.controls.filter((control) => control.enabled || this.disabled)\n            .map((control) => control.value);\n  }\n\n  /** @internal */\n  override _anyControls(condition: (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(controls: AbstractControl[],\n      validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null,\n      asyncValidator?: AsyncValidatorFn|AsyncValidatorFn[]|null): 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"]}