/**
 * Miscellaneous helper utilities ported from triangle-js-sdks.
 */
/**
 * Return a promise that resolves after `ttl` milliseconds.
 */
export declare function delay(ttl: number): Promise<void>;
/**
 * Ponyfill for `Promise.withResolvers()` (available natively from ES2024).
 */
export declare function promiseWithResolvers<T>(): {
    promise: Promise<T>;
    resolve: (value: T) => void;
    reject: (reason: unknown) => void;
};
/**
 * Build an action string from a method name and a suffix.
 *
 * Example: `composeAction('host_account_get', 'request')` produces
 * `'host_account_get_request'`.
 */
export declare function composeAction<M extends string, S extends string>(method: M, suffix: S): `${M}_${S}`;
/**
 * Extract a human-readable message from an unknown thrown value.
 */
export declare function extractErrorMessage(err: unknown): string;
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