/** Decode JWT payload (no signature verification — client-side expiry checks only). */
export declare function decodeJwtPayload(token: string): Record<string, unknown> | null;
/** JWT `exp` claim in milliseconds since epoch, or null if missing / not a JWT. */
export declare function getJwtExpiryMs(token: string): number | null;
export declare function isJwtExpired(token: string, skewMs?: number): boolean;
export declare function isJwtExpiringWithin(token: string, withinMs: number): boolean;
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