/**
 * @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 } from './abstract_model';
/**
 * FormControlState is a boxed form value. It is an object with a `value` key and a `disabled` key.
 *
 * @publicApi
 */
export interface FormControlState<T> {
    value: T;
    disabled: boolean;
}
/**
 * Interface for options provided to a `FormControl`.
 *
 * This interface extends all options from {@link AbstractControlOptions}, plus some options
 * unique to `FormControl`.
 *
 * @publicApi
 */
export interface FormControlOptions extends AbstractControlOptions {
    /**
     * @description
     * Whether to use the initial value used to construct the `FormControl` as its default value
     * as well. If this option is false or not provided, the default value of a FormControl is `null`.
     * When a FormControl is reset without an explicit value, its value reverts to
     * its default value.
     */
    nonNullable?: boolean;
    /**
     * @deprecated Use `nonNullable` instead.
     */
    initialValueIsDefault?: boolean;
}
/**
 * Tracks the value and validation status of an individual form control.
 *
 * This is one of the four fundamental building blocks of Angular forms, along with
 * `FormGroup`, `FormArray` and `FormRecord`. It extends the `AbstractControl` class that
 * implements most of the base functionality for accessing the value, validation status,
 * user interactions and events.
 *
 * `FormControl` takes a single generic argument, which describes the type of its value. This
 * argument always implicitly includes `null` because the control can be reset. To change this
 * behavior, set `nonNullable` or see the usage notes below.
 *
 * See [usage examples below](#usage-notes).
 *
 * @see {@link AbstractControl}
 * @see [Reactive Forms Guide](guide/reactive-forms)
 * @see [Usage Notes](#usage-notes)
 *
 * @publicApi
 *
 * @overriddenImplementation ɵFormControlCtor
 *
 * @usageNotes
 *
 * ### Initializing Form Controls
 *
 * Instantiate a `FormControl`, with an initial value.
 *
 * ```ts
 * const control = new FormControl('some value');
 * console.log(control.value);     // 'some value'
 * ```
 *
 * The following example initializes the control with a form state object. The `value`
 * and `disabled` keys are required in this case.
 *
 * ```ts
 * const control = new FormControl({ value: 'n/a', disabled: true });
 * console.log(control.value);     // 'n/a'
 * console.log(control.status);    // 'DISABLED'
 * ```
 *
 * The following example initializes the control with a synchronous validator.
 *
 * ```ts
 * const control = new FormControl('', Validators.required);
 * console.log(control.value);      // ''
 * console.log(control.status);     // 'INVALID'
 * ```
 *
 * The following example initializes the control using an options object.
 *
 * ```ts
 * const control = new FormControl('', {
 *    validators: Validators.required,
 *    asyncValidators: myAsyncValidator
 * });
 * ```
 *
 * ### The single type argument
 *
 * `FormControl` accepts a generic argument, which describes the type of its value.
 * In most cases, this argument will be inferred.
 *
 * If you are initializing the control to `null`, or you otherwise wish to provide a
 * wider type, you may specify the argument explicitly:
 *
 * ```
 * let fc = new FormControl<string|null>(null);
 * fc.setValue('foo');
 * ```
 *
 * You might notice that `null` is always added to the type of the control.
 * This is because the control will become `null` if you call `reset`. You can change
 * this behavior by setting `{nonNullable: true}`.
 *
 * ### Configure the control to update on a blur event
 *
 * Set the `updateOn` option to `'blur'` to update on the blur `event`.
 *
 * ```ts
 * const control = new FormControl('', { updateOn: 'blur' });
 * ```
 *
 * ### Configure the control to update on a submit event
 *
 * Set the `updateOn` option to `'submit'` to update on a submit `event`.
 *
 * ```ts
 * const control = new FormControl('', { updateOn: 'submit' });
 * ```
 *
 * ### Reset the control back to a specific value
 *
 * You reset to a specific form state by passing through a standalone
 * value or a form state object that contains both a value and a disabled state
 * (these are the only two properties that cannot be calculated).
 *
 * ```ts
 * const control = new FormControl('Nancy');
 *
 * console.log(control.value); // 'Nancy'
 *
 * control.reset('Drew');
 *
 * console.log(control.value); // 'Drew'
 * ```
 *
 * ### Reset the control to its initial value
 *
 * If you wish to always reset the control to its initial value (instead of null),
 * you can pass the `nonNullable` option:
 *
 * ```
 * const control = new FormControl('Nancy', {nonNullable: true});
 *
 * console.log(control.value); // 'Nancy'
 *
 * control.reset();
 *
 * console.log(control.value); // 'Nancy'
 * ```
 *
 * ### Reset the control back to an initial value and disabled
 *
 * ```
 * const control = new FormControl('Nancy');
 *
 * console.log(control.value); // 'Nancy'
 * console.log(control.status); // 'VALID'
 *
 * control.reset({ value: 'Drew', disabled: true });
 *
 * console.log(control.value); // 'Drew'
 * console.log(control.status); // 'DISABLED'
 * ```
 */
export interface FormControl<TValue = any> extends AbstractControl<TValue> {
    /**
     * The default value of this FormControl, used whenever the control is reset without an explicit
     * value. See {@link FormControlOptions#nonNullable} for more information on configuring
     * a default value.
     */
    readonly defaultValue: TValue;
    /** @internal */
    _onChange: Function[];
    /**
     * This field holds a pending value that has not yet been applied to the form's value.
     * @internal
     */
    _pendingValue: TValue;
    /** @internal */
    _pendingChange: boolean;
    /**
     * Sets a new value for the form control.
     *
     * @param value The new value for the control.
     * @param options Configuration options that determine how the control propagates changes
     * and emits events when the value changes.
     * The configuration options are passed to the {@link AbstractControl#updateValueAndValidity
     * updateValueAndValidity} method.
     *
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
     * false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control value is updated.
     * When false, no events are emitted.
     * * `emitModelToViewChange`: When true or not supplied  (the default), each change triggers an
     * `onChange` event to
     * update the view.
     * * `emitViewToModelChange`: When true or not supplied (the default), each change triggers an
     * `ngModelChange`
     * event to update the model.
     *
     */
    setValue(value: TValue, options?: {
        onlySelf?: boolean;
        emitEvent?: boolean;
        emitModelToViewChange?: boolean;
        emitViewToModelChange?: boolean;
    }): void;
    /**
     * Patches the value of a control.
     *
     * This function is functionally the same as {@link FormControl#setValue setValue} at this level.
     * It exists for symmetry with {@link FormGroup#patchValue patchValue} on `FormGroups` and
     * `FormArrays`, where it does behave differently.
     *
     * @see {@link FormControl#setValue} for options
     */
    patchValue(value: TValue, options?: {
        onlySelf?: boolean;
        emitEvent?: boolean;
        emitModelToViewChange?: boolean;
        emitViewToModelChange?: boolean;
    }): void;
    /**
     * Resets the form control, marking it `pristine` and `untouched`, and resetting
     * the value. The new value will be the provided value (if passed), `null`, or the initial value
     * if `nonNullable` was set in the constructor via {@link FormControlOptions}.
     *
     * ```ts
     * // By default, the control will reset to null.
     * const dog = new FormControl('spot');
     * dog.reset(); // dog.value is null
     *
     * // If this flag is set, the control will instead reset to the initial value.
     * const cat = new FormControl('tabby', {nonNullable: true});
     * cat.reset(); // cat.value is "tabby"
     *
     * // A value passed to reset always takes precedence.
     * const fish = new FormControl('finn', {nonNullable: true});
     * fish.reset('bubble'); // fish.value is "bubble"
     * ```
     *
     * @param formState Resets the control with an initial value,
     * or an object that defines the initial value and disabled state.
     *
     * @param options Configuration options that determine how the control propagates changes
     * and emits events after the value changes.
     *
     * * `onlySelf`: When true, each change only affects this control, and not its parent. Default is
     * false.
     * * `emitEvent`: When true or not supplied (the default), both the `statusChanges` and
     * `valueChanges`
     * observables emit events with the latest status and value when the control is reset.
     * When false, no events are emitted.
     *
     */
    reset(formState?: TValue | FormControlState<TValue>, options?: {
        onlySelf?: boolean;
        emitEvent?: boolean;
    }): void;
    /**
     * For a simple FormControl, the raw value is equivalent to the value.
     */
    getRawValue(): TValue;
    /**
     * @internal
     */
    _updateValue(): void;
    /**
     * @internal
     */
    _anyControls(condition: (c: AbstractControl) => boolean): boolean;
    /**
     * @internal
     */
    _allControlsDisabled(): boolean;
    /**
     * Register a listener for change events.
     *
     * @param fn The method that is called when the value changes
     */
    registerOnChange(fn: Function): void;
    /**
     * Internal function to unregister a change events listener.
     * @internal
     */
    _unregisterOnChange(fn: (value?: any, emitModelEvent?: boolean) => void): void;
    /**
     * Register a listener for disabled events.
     *
     * @param fn The method that is called when the disabled status changes.
     */
    registerOnDisabledChange(fn: (isDisabled: boolean) => void): void;
    /**
     * Internal function to unregister a disabled event listener.
     * @internal
     */
    _unregisterOnDisabledChange(fn: (isDisabled: boolean) => void): void;
    /**
     * @internal
     */
    _forEachChild(cb: (c: AbstractControl) => void): void;
    /** @internal */
    _syncPendingControls(): boolean;
}
/**
 * Various available constructors for `FormControl`.
 * Do not use this interface directly. Instead, use `FormControl`:
 * ```
 * const fc = new FormControl('foo');
 * ```
 * This symbol is prefixed with ɵ to make plain that it is an internal symbol.
 */
export interface ɵFormControlCtor {
    /**
     * Construct a FormControl with no initial value or validators.
     */
    new (): FormControl<any>;
    /**
     * Creates a new `FormControl` instance.
     *
     * @param formState Initializes the control with an initial value,
     * or an object that defines the initial value and disabled state.
     *
     * @param validatorOrOpts A synchronous validator function, or an array of
     * such functions, or a `FormControlOptions` object that contains validation functions
     * and a validation trigger.
     *
     * @param asyncValidator A single async validator or array of async validator functions
     */
    new <T = any>(value: FormControlState<T> | T, opts: FormControlOptions & {
        nonNullable: true;
    }): FormControl<T>;
    /**
     * @deprecated Use `nonNullable` instead.
     */
    new <T = any>(value: FormControlState<T> | T, opts: FormControlOptions & {
        initialValueIsDefault: true;
    }): FormControl<T>;
    /**
     * @deprecated When passing an `options` argument, the `asyncValidator` argument has no effect.
     */
    new <T = any>(value: FormControlState<T> | T, opts: FormControlOptions, asyncValidator: AsyncValidatorFn | AsyncValidatorFn[]): FormControl<T | null>;
    new <T = any>(value: FormControlState<T> | T, validatorOrOpts?: ValidatorFn | ValidatorFn[] | FormControlOptions | null, asyncValidator?: AsyncValidatorFn | AsyncValidatorFn[] | null): FormControl<T | null>;
    /**
     * The presence of an explicit `prototype` property provides backwards-compatibility for apps that
     * manually inspect the prototype chain.
     */
    prototype: FormControl<any>;
}
export declare const FormControl: ɵFormControlCtor;
interface UntypedFormControlCtor {
    new (): UntypedFormControl;
    new (formState?: any, validatorOrOpts?: ValidatorFn | ValidatorFn[] | FormControlOptions | null, asyncValidator?: AsyncValidatorFn | AsyncValidatorFn[] | null): UntypedFormControl;
    /**
     * The presence of an explicit `prototype` property provides backwards-compatibility for apps that
     * manually inspect the prototype chain.
     */
    prototype: FormControl<any>;
}
/**
 * UntypedFormControl is a non-strongly-typed version of `FormControl`.
 */
export type UntypedFormControl = FormControl<any>;
export declare const UntypedFormControl: UntypedFormControlCtor;
/**
 * @description
 * Asserts that the given control is an instance of `FormControl`
 *
 * @publicApi
 */
export declare const isFormControl: (control: unknown) => control is FormControl<any>;
export {};