/**
 * This is a copy of https://github.com/nodeca/js-yaml/blob/master/lib/dumper.js LICENSED under MIT
 *
 * It is modified to improve performance when finding duplicate refs.
 * Instead of using an array with indexOf resulting in O(n2) it was changed to use es6 Set.
 */
export declare function dump(input: any, options: any): string;
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