export interface SignedAuthConfig {
    type: 'signed';
    apiKey: string;
    privateKey: Uint8Array;
}
export interface BearerAuthConfig {
    type: 'bearer';
    token: string;
}
export type AuthConfig = SignedAuthConfig | BearerAuthConfig;
export declare const EMPTY_BODY_HASH: string;
export type SignedHeaders = Record<string, string>;
export declare function buildSignedHeaders(config: SignedAuthConfig, method: string, // uppercase: 'GET', 'POST', etc.
pathWithQuery: string, // path + query string exactly as transmitted
body: string, // JSON-serialized body or '' for GET/no-body
idempotencyKey: string, // '' for GET requests
options?: {
    clockOffsetMs?: number;
}): Promise<SignedHeaders>;
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