import { PipeTransform, OpaqueToken } from '@angular/core';
import { DatePipe } from '@angular/common';
export declare abstract class CachedDatePipe implements PipeTransform {
    protected datePipe: DatePipe;
    constructor(locale: OpaqueToken);
    /**
     * @override
     */
    abstract transform(date: any, pattern?: string): string;
}
export declare class ZoneCachedDatePipe extends CachedDatePipe {
    constructor(locale: OpaqueToken);
    /**
     * @override
     */
    transform(date: any, pattern?: string): string;
}
export declare class MemoryCachedDatePipe extends CachedDatePipe {
    constructor(locale: OpaqueToken);
    /**
     * @override
     */
    transform(date: any, pattern?: string): string;
}