export type Base64Variant = "standard" | "url";
export declare function encodeBase64(bytes: Uint8Array, variant?: Base64Variant): string;
export declare function decodeBase64(value: string, variant?: Base64Variant): Uint8Array;
export declare function encodeUtf8(value: string): Uint8Array;
export declare function decodeUtf8(bytes: Uint8Array): string;
export declare function truncateUtf8(value: string, maxBytes: number): string;
export declare function toWebSocketUrl(value: string | URL): string;
/** Canonical device and owner identities are standard Ed25519 base64 values. */
export declare function normalizeDeviceId(value: string): string;