/**
 * @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 { AsyncValidatorFn, ValidatorFn } from '../directives/validators';
import { AbstractControl, AbstractControlOptions, ɵRawValue, ɵTypedOrUntyped, ɵValue } from './abstract_model';
/**
 * FormArrayValue extracts the type of `.value` from a FormArray's element type, and wraps it in an
 * array.
 *
 * Angular uses this type internally to support Typed Forms; do not use it directly. The untyped
 * case falls back to any[].
 */
export type ɵFormArrayValue<T extends AbstractControl<any>> = ɵTypedOrUntyped<T, Array<ɵValue<T>>, any[]>;
/**
 * FormArrayRawValue extracts the type of `.getRawValue()` from a FormArray's element type, and
 * wraps it in an array. The untyped case falls back to any[].
 *
 * Angular uses this type internally to support Typed Forms; do not use it directly.
 */
export type ɵFormArrayRawValue<T extends AbstractControl<any>> = ɵTypedOrUntyped<T, Array<ɵRawValue<T>>, any[]>;
/**
 * 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 declare class FormArray<TControl extends AbstractControl<any> = any> extends AbstractControl<ɵTypedOrUntyped<TControl, ɵFormArrayValue<TControl>, any>, ɵTypedOrUntyped<TControl, ɵFormArrayRawValue<TControl>, any>> {
    /**
     * 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: Array<TControl>, validatorOrOpts?: ValidatorFn | ValidatorFn[] | AbstractControlOptions | null, asyncValidator?: AsyncValidatorFn | AsyncValidatorFn[] | null);
    controls: ɵTypedOrUntyped<TControl, Array<TControl>, Array<AbstractControl<any>>>;
    /**
     * 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: number): ɵTypedOrUntyped<TControl, TControl, AbstractControl<any>>;
    /**
     * 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: TControl, options?: {
        emitEvent?: boolean;
    }): void;
    /**
     * 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: number, control: TControl, options?: {
        emitEvent?: boolean;
    }): void;
    /**
     * 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: number, options?: {
        emitEvent?: boolean;
    }): void;
    /**
     * 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: number, control: TControl, options?: {
        emitEvent?: boolean;
    }): void;
    /**
     * Length of the control array.
     */
    get length(): number;
    /**
     * 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: ɵFormArrayRawValue<TControl>, options?: {
        onlySelf?: boolean;
        emitEvent?: boolean;
    }): void;
    /**
     * 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: ɵFormArrayValue<TControl>, options?: {
        onlySelf?: boolean;
        emitEvent?: boolean;
    }): void;
    /**
     * 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?: ɵTypedOrUntyped<TControl, ɵFormArrayValue<TControl>, any>, options?: {
        onlySelf?: boolean;
        emitEvent?: boolean;
    }): void;
    /**
     * The aggregate value of the array, including any disabled controls.
     *
     * Reports all values regardless of disabled status.
     */
    getRawValue(): ɵFormArrayRawValue<TControl>;
    /**
     * 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?: {
        emitEvent?: boolean;
    }): void;
    /**
     * Adjusts a negative index by summing it with the length of the array. For very negative
     * indices, the result may remain negative.
     * @internal
     */
    private _adjustIndex;
    /** @internal */
    _syncPendingControls(): boolean;
    /** @internal */
    _forEachChild(cb: (c: AbstractControl, index: number) => void): void;
    /** @internal */
    _updateValue(): void;
    /** @internal */
    _anyControls(condition: (c: AbstractControl) => boolean): boolean;
    /** @internal */
    _setUpControls(): void;
    /** @internal */
    _allControlsDisabled(): boolean;
    private _registerControl;
    /** @internal */
    _find(name: string | number): AbstractControl | null;
}
interface UntypedFormArrayCtor {
    new (controls: AbstractControl[], validatorOrOpts?: ValidatorFn | ValidatorFn[] | AbstractControlOptions | null, asyncValidator?: AsyncValidatorFn | AsyncValidatorFn[] | null): UntypedFormArray;
    /**
     * The presence of an explicit `prototype` property provides backwards-compatibility for apps that
     * manually inspect the prototype chain.
     */
    prototype: FormArray<any>;
}
/**
 * UntypedFormArray is a non-strongly-typed version of `FormArray`, which
 * permits heterogenous controls.
 */
export type UntypedFormArray = FormArray<any>;
export declare const UntypedFormArray: UntypedFormArrayCtor;
/**
 * @description
 * Asserts that the given control is an instance of `FormArray`
 *
 * @publicApi
 */
export declare const isFormArray: (control: unknown) => control is FormArray<any>;
export {};