import { CowSwapWidgetParams } from './types';
/**
 * When `true`, invalid `baseUrl` values throw and stop widget creation.
 * When `false`, invalid values are reported with `console.error` and the iframe falls back to the production host.
 */
export declare const SHOULD_THROW_IF_INVALID_URL = false;
/**
 * Normalizes `baseUrl` for the widget iframe `src` and rejects unsafe values.
 * - Omits or blank `baseUrl` → production default (https://swap.cow.fi).
 * - Allows `https:` for any host (self-hosted / staging).
 * - Allows `http:` only on local dev loopback hostnames.
 * @param throwIfInvalid Overrides {@link SHOULD_THROW_IF_INVALID_URL} (e.g. for unit tests).
 * @throws {Error} When validation fails and `throwIfInvalid` is true (see {@link SHOULD_THROW_IF_INVALID_URL}).
 */
export declare function sanitizeWidgetBaseUrl(baseUrl: string | undefined, throwIfInvalid?: boolean): string;
export declare function buildWidgetUrl(params: Partial<CowSwapWidgetParams>): string;
export declare function buildWidgetPath(params: Partial<CowSwapWidgetParams>): string;
export declare function buildWidgetUrlQuery(params: Partial<CowSwapWidgetParams>): URLSearchParams;