/**
 * utils/base64.ts — binary ⇄ standard base64, isomorphic (browser, Node ≥ 16, Workers).
 *
 * Built on the global `btoa`/`atob` every supported runtime provides, so the engine
 * keeps zero runtime dependencies (no `Buffer`). One implementation for every wire
 * encoding the Evermind contract uses — weight deltas and packed embeddings alike.
 */
/** Encode bytes as standard (padded) base64. */
export declare function bytesToBase64(bytes: ArrayBuffer | Uint8Array): string;
/** Decode standard base64 to a fresh `ArrayBuffer`. Throws on malformed input (as `atob` does). */
export declare function base64ToBytes(b64: string): ArrayBuffer;
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