export type CalcExpirationTimeArg = {
    expiresIn?: string;
    expiresAt?: string;
    expiresNever?: boolean;
};
export declare function calcExpirationTime({ expiresIn, expiresAt, expiresNever }: CalcExpirationTimeArg): number | null | undefined;
export declare function isExpired(unixTime: number): boolean;
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