/**
 * Pure-JS base64url codec (no padding, RFC 4648 §5).
 *
 * Lives in `utils/` rather than `crypto/` because it's needed by models (e.g.
 * VaultDocument serialization) and we don't want models pulling the crypto
 * provider — that would force the Node WASM provider into the RN bundle even
 * for code paths that don't touch crypto.
 *
 * Both providers (Node WASM and RN) re-export these helpers under the same
 * names; this module is the canonical implementation used by non-crypto code.
 */
export declare function toBase64UrlPure(data: Uint8Array): string;
export declare function fromBase64UrlPure(encoded: string): Uint8Array;