/**
 * Credentials required for HMAC signature generation
 */
export type Credentials = {
    key: string;
    secret: string;
    passphrase: string;
};
/**
 * Header payload containing signature and metadata for authenticated requests
 */
export type HeaderPayload = {
    timestamp: number;
    signature: string;
    key: string;
    passphrase: string;
};
/**
 * HTTP methods supported for signing
 */
export type Method = "GET" | "POST" | "DELETE";
/**
 * Signer class for creating HMAC-SHA256 signatures for API authentication
 */
export declare class Signer {
    readonly credentials: Credentials;
    constructor(credentials: Credentials);
    /**
     * Creates a header payload with HMAC signature for API authentication
     * @param options - Options for creating the header payload
     * @returns Header payload containing signature and authentication details
     */
    createHeaderPayload({ method, path, body, timestamp }: {
        method: Method;
        path: string;
        body: string | undefined;
        timestamp: number | undefined;
    }): HeaderPayload;
}
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