import { OpaqueToken } from 'angular2/core';
/**
 * A bridge between a control and a native element.
 *
 * A `ControlValueAccessor` abstracts the operations of writing a new value to a
 * DOM element representing an input control.
 *
 * Please see {@link DefaultValueAccessor} for more information.
 */
export interface ControlValueAccessor {
    /**
     * Write a new value to the element.
     */
    writeValue(obj: any): void;
    /**
     * Set the function to be called when the control receives a change event.
     */
    registerOnChange(fn: any): void;
    /**
     * Set the function to be called when the control receives a touch event.
     */
    registerOnTouched(fn: any): void;
}
/**
 * Used to provide a {@link ControlValueAccessor} for form controls.
 *
 * See {@link DefaultValueAccessor} for how to implement one.
 */
export declare const NG_VALUE_ACCESSOR: OpaqueToken;