/**
 * Creates a fluent builder for constructing URL query strings.
 *
 * Each `.add()` call serializes its value immediately (like C#'s builder),
 * so no format tracking is needed — the style is applied at add-time.
 *
 * Usage (generated code):
 *
 *     const qs = core.url.queryBuilder()
 *         .add("limit", limit)
 *         .add("tags", tags, { style: "comma" })   // explode: false
 *         .mergeAdditional(requestOptions?.queryParams)
 *         .build();
 */
export declare function queryBuilder(): QueryStringBuilder;
declare class QueryStringBuilder {
    private parts;
    /**
     * Adds a query parameter, serializing it immediately.
     *
     * By default arrays use "repeat" format (`key=a&key=b`).
     * Pass `{ style: "comma" }` for OpenAPI `explode: false` parameters
     * to get comma-separated values (`key=a,b,c`).
     *
     * Null / undefined values are silently skipped.
     */
    add(key: string, value: unknown, options?: {
        style?: "comma";
    }): this;
    /**
     * Adds multiple query parameters at once from a record.
     * All parameters use the default "repeat" array format.
     * Null / undefined values are silently skipped.
     */
    addMany(params: Record<string, unknown>): this;
    /**
     * Merges additional query parameters supplied at call-time via
     * `requestOptions.queryParams`. Overrides existing keys (last-write-wins).
     */
    mergeAdditional(additionalParams?: Record<string, unknown>): this;
    /**
     * Returns the assembled query string (without the leading `?`).
     * Returns an empty string when no parameters were added.
     */
    build(): string;
}
export {};