/**
 * Internal dependencies
 */
import type { History } from '../types';
/**
 * Class for the history persistence layer.
 *
 * @since 0.5.0
 */
export default class HistoryPersistence {
    /**
     * Checks whether there is a history for a given feature and history slug.
     *
     * @since 0.5.0
     *
     * @param feature - Unique identifier of the feature. Must only contain lowercase letters, numbers, hyphens.
     * @param slug    - Unique identifier of the history within the feature. Must only contain lowercase letters, numbers, hyphens.
     * @returns True if there is a history, false otherwise.
     */
    hasHistory(feature: string, slug: string): Promise<boolean>;
    /**
     * Loads the history for a given feature and history slug.
     *
     * @since 0.5.0
     *
     * @param feature - Unique identifier of the feature. Must only contain lowercase letters, numbers, hyphens.
     * @param slug    - Unique identifier of the history within the feature. Must only contain lowercase letters, numbers, hyphens.
     * @returns The history, or null if there is no history.
     */
    loadHistory(feature: string, slug: string): Promise<History | null>;
    /**
     * Saves the history for a given feature and history slug.
     *
     * @since 0.5.0
     *
     * @param history - The history to save. Must have a unique feature and history slug set.
     * @returns True on success, false on failure.
     */
    saveHistory(history: History): Promise<boolean>;
    /**
     * Clears the history for a given feature and history slug.
     *
     * @since 0.5.0
     *
     * @param feature - Unique identifier of the feature. Must only contain lowercase letters, numbers, hyphens.
     * @param slug    - Unique identifier of the history within the feature. Must only contain lowercase letters, numbers, hyphens.
     * @returns True on success, false on failure.
     */
    clearHistory(feature: string, slug: string): Promise<boolean>;
    /**
     * Loads all histories for a given feature.
     *
     * @since 0.5.0
     *
     * @param feature - Unique identifier of the feature. Must only contain lowercase letters, numbers, hyphens.
     * @returns All histories for the feature.
     */
    loadHistoriesForFeature(feature: string): Promise<History[]>;
}
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