import type { KeyValue } from './types.js';
import type { IQueryString } from './IQueryString.js';
/**
 * Builds and validates URLs and query strings for outbound requests.
 */
export declare class QueryString implements IQueryString {
    /**
     * HTTP schemes allowed for outbound requests.
     */
    private static readonly ALLOWED_PROTOCOLS;
    /**
     * Returns whether a URL string is a root-relative path (`/api`), not protocol-relative (`//cdn`).
     *
     * @param url - Trimmed URL string.
     */
    private isRootRelativePath;
    /**
     * Appends query parameters via string concatenation for root-relative paths.
     *
     * @param trimmed - Trimmed base URL that failed absolute URL parsing.
     * @param enabledParams - Enabled key-value pairs to append.
     */
    private appendQueryFallback;
    /**
     * Appends enabled query parameters to a base URL.
     *
     * @param baseUrl - Request URL before query string merging.
     * @param params - Key-value pairs to append as search params.
     * @returns URL with merged query parameters.
     */
    buildUrl(baseUrl: string, params: KeyValue[]): string;
    /**
     * Returns whether a URL is safe to send via fetch: absolute http(s) or root-relative path.
     *
     * @param url - Request URL before or after query string merging.
     * @returns True when the URL uses http/https or is a root-relative path.
     */
    isValidRequestUrl(url: string): boolean;
}
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