import { NgControl } from '@angular/forms';
import { Observable } from 'rxjs';
/** An interface which allows a control to work inside of a `SbbField`. */
export declare abstract class SbbFormFieldControl<TValue> {
    /** The value of the control. */
    value: TValue | null;
    /**
     * Stream that emits whenever the state of the control changes such that the parent `SbbField`
     * needs to run change detection.
     */
    readonly stateChanges: Observable<void>;
    /** The id of the form field. */
    readonly id: string;
    /** The attached NgControl, if any exists. */
    readonly ngControl: NgControl | undefined;
    /** Whether the control is focused. */
    readonly focused: boolean;
    /** Whether the control is empty. */
    readonly empty: boolean;
    /** Whether the control is required. */
    readonly required: boolean;
    /** Whether the control is disabled. */
    readonly disabled: boolean;
    /** Whether the control is in an error state. */
    readonly errorState: boolean;
    /**
     * An optional name for the control type that can be used to distinguish `sbb-form-field` elements
     * based on their control type. The form field will add a class,
     * `sbb-form-field-type-{{controlType}}` to its root element.
     */
    readonly controlType?: string;
    /**
     * Whether the input is currently in an autofilled state. If property is not present on the
     * control it is assumed to be false.
     */
    readonly autofilled?: boolean;
    /**
     * Value of `aria-describedby` that should be merged with the described-by ids
     * which are set by the form-field.
     */
    readonly userAriaDescribedBy?: string;
    /** Sets the list of element IDs that currently describe this control. */
    abstract setDescribedByIds(ids: string[]): void;
    /** callback is called when a click event occurs on the label. */
    abstract onContainerClick(event: Event): void;
}