import moment from 'moment';
import { RuntimeCtx } from '../ctx.js';
import { Element } from '../element.js';
import { Pipe } from '../model/index.js';
export declare class DateFormat extends Pipe {
    static $type: string;
    static $help: string;
    inputFormat: string;
    outputFormat: string;
    strict: boolean;
    init(spec: any): void;
    apply(inputSet: Element[], _ctx: RuntimeCtx): Promise<Element[]>;
    tryParseDate(value: string, inputFormats: string[], strict: boolean): moment.Moment;
}
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