export declare function base64UrlEncodeBytes(bytes: Uint8Array): string;
export declare function base64UrlEncodeJson(value: unknown): string;
export declare function pemToPkcs8DerBytes(pem: string): Uint8Array;
export declare function signJwtRs256(options: {
    privateKeyPem: string;
    claims: Record<string, unknown>;
    header?: Record<string, unknown>;
}): Promise<string>;
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