import { ethers } from 'ethers';
import * as constants from '#constants';
import type { AnyObj } from '#types/utils';
export declare const isNode: boolean;
export declare function createHmacRestRequestSignatureHeader(payload: string, secret: string): {
    [constants.REST_HMAC_SIGNATURE_HEADER]: string;
};
/**
 * Creates a new wallet and nonce to use for delegated keys
 *
 * @internal
 */
export declare function createDelegatedKeyWalletAndNonce(): readonly [
    ethers.HDNodeWallet,
    string
];
/**
 * - For use internally at Kuma and may be removed or changed anywhere it is implemented without warning.
 *
 * @internal
 */
export declare const INTERNAL_SYMBOL: unique symbol;
/**
 * Asserts that the provided nonce is a uuid v1 string.
 *
 * @internal
 */
export declare function assertNonceIsValid(nonce: string): asserts nonce is string;
export declare function deriveBaseURL(options: {
    sandbox?: boolean;
    overrideBaseURL?: string;
    api: 'rest' | 'websocket';
    baseRestApiURL?: string;
    baseWebSocketURL?: string;
}): string;
/**
 * URLSearchParams encodes undefined and null as strings, we remove them as a
 * precaution if this happens.
 */
export declare function sanitizeSearchParams(searchParams?: URLSearchParams | AnyObj | undefined): URLSearchParams;
/**
 * By using this in default switch case, we can enforce exhaustive check of all case cases.
 *
 * @example
 * ```typescript
 *  switch (prop) {
 *    // ...
 *    default:
 *      throw new UnreachableCaseError(prop);
 *  }
 * ```
 *
 * @internal
 */
export declare class UnreachableCaseError extends Error {
    /**
     *
     * @param value The value being switched that caused the default case to be reached.
     * @param info Optionally the name of the fn or switch that caused the error for logging.
     */
    constructor(value: never, info?: string);
}
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