import type { HlWsFastAssetCtx } from '../types/index.js';
/**
 * Decode a base64-encoded raw-DEFLATE payload and parse its UTF-8 JSON body.
 * @typeParam T - Expected shape of the decoded JSON value.
 * @throws If decompression or JSON parsing fails.
 * @public
 */
export declare function decodeCompressedJson<T>(base64: string): Promise<T>;
/**
 * Decode a Hyperliquid `fastAssetCtxs` frame. HL sends the payload as a
 * base64-encoded, raw-DEFLATE-compressed (RFC 1951 — no zlib/gzip wrapper) JSON
 * object keyed by coin. Decoded via the web-standard `DecompressionStream`
 * (Node 18+, modern browsers), so no dependency is needed.
 *
 * @throws If the input is not valid base64 / raw-DEFLATE / JSON.
 * @public
 */
export declare function decodeFastAssetCtxs(base64: string): Promise<Record<string, HlWsFastAssetCtx>>;
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