import { EventEmitter } from '@angular/core';
/**
 * Simple function interface for persers like:
 *
 * @see https://github.com/angular/components/tree/master/src/cdk/coercion
 */
export declare type AttributeParser<T> = (source: any) => T;
/**
 * Simple class to help the creation of bidi binding attributes.
 * As typescript and angular doesn't enfore types this class helps to handle it.
 *
 * Instead of:
 * ```ts
 * @Output('valueChange') value: EventEmitter<number> = new EventEmitter<number>();
 * @Input('value') value: number = 1; // parsing code removed
 * ```
 *
 * ```ts
 * _value = new Attribute<number>(this.yChange, NUMBER_PARSER, 1);
 * @Output('valueChange') valueChange = _value.eventEmitter;
 * @Input('value') set value(value: number) { this._value.value = value; }
 * get value(): number {return this._value.value; }
 * ```
 *
 * @see https://github.com/angular/components/tree/master/src/cdk/coercion
 */
export declare class Attribute<T> {
    private _parser;
    private _event;
    readonly eventEmitter: EventEmitter<T>;
    private _value;
    value: T;
    constructor(parser: AttributeParser<T>, value?: T);
    complete(): void;
    toString(): string;
}
export declare const NOP_PARSER: AttributeParser<any>;
export declare const STRING_PARSER: AttributeParser<string>;
/**
 * Converts the given value to a number
 * https://flaviocopes.com/how-to-convert-string-to-number-javascript/
 * @param source input value
 */
export declare const NUMBER_PARSER: AttributeParser<number>;
/**
 * Like the NUMBER_PARSER but always returns integers.
 * @param source any value to parse
 */
export declare const INT_PARSER: AttributeParser<number>;