import { Duration } from '@salesforce/kit';
import { JsonMap, Nullable } from '@salesforce/ts-types';
import { ConfigFile } from './configFile';
/**
 * A Time To Live configuration file where each entry is timestamped and removed once the TTL has expired.
 *
 * @example
 * ```
 * import { Duration } from '@salesforce/kit';
 * const config = await TTLConfig.create({
 *   isGlobal: false,
 *   ttl: Duration.days(1)
 * });
 * ```
 */
export declare class TTLConfig<T extends TTLConfig.Options, P extends JsonMap> extends ConfigFile<T, TTLConfig.Contents<P>> {
    set(key: string, value: Partial<TTLConfig.Entry<P>>): void;
    getLatestEntry(): Nullable<[string, TTLConfig.Entry<P>]>;
    getLatestKey(): Nullable<string>;
    isExpired(dateTime: number, value: P & {
        timestamp: string;
    }): boolean;
    protected init(): Promise<void>;
    private timestamp;
}
export declare namespace TTLConfig {
    type Options = ConfigFile.Options & {
        ttl: Duration;
    };
    type Entry<T extends JsonMap> = T & {
        timestamp: string;
    };
    type Contents<T extends JsonMap> = Record<string, Entry<T>>;
}