/** @hidden */
/**
 * Copyright (c) 2019, salesforce.com, inc.
 * All rights reserved.
 * SPDX-License-Identifier: MIT
 * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
 */
/**
 * Gets a folder hash as an observable.
 *
 * @param {string} target The directory to compute the version key for
 * @returns An observable that will notify observers when the folder hash changes
 */
export default function folderHash(target: any): Promise<{
    subscribe(observer: any): {
        unsubscribe: () => void;
    };
}>;
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