/**
 * Number Groups namespace — CRUD + membership management.
 */
import type { HttpClient } from '../HttpClient.js';
import type { QueryParams } from '../types.js';
import { CrudResource } from '../base/CrudResource.js';
/**
 * Number group management with membership operations.
 *
 * Access via `client.numberGroups.*`. Extends standard CRUD with membership helpers.
 */
export declare class NumberGroupsResource extends CrudResource {
    protected _updateMethod: 'PATCH' | 'PUT';
    constructor(http: HttpClient);
    /**
     * List memberships (phone-number assignments) in a group.
     *
     * @param groupId - Unique identifier of the number group.
     * @param params - Optional filter / pagination query parameters.
     * @returns A paginated list of number-group memberships.
     * @throws {RestError} On any non-2xx HTTP response.
     */
    listMemberships(groupId: string, params?: QueryParams): Promise<any>;
    /**
     * Add a phone number to a group.
     *
     * @param groupId - Unique identifier of the number group.
     * @param body - Membership payload (typically `{ phone_number_id: "..." }`).
     * @returns The newly-created membership record.
     * @throws {RestError} On any non-2xx HTTP response.
     */
    addMembership(groupId: string, body: any): Promise<any>;
    /**
     * Fetch a membership by ID.
     *
     * @param membershipId - Unique identifier of the membership.
     * @returns The membership record.
     * @throws {RestError} On any non-2xx HTTP response (including `404`).
     */
    getMembership(membershipId: string): Promise<any>;
    /**
     * Remove a number from a group by deleting its membership.
     *
     * @param membershipId - Unique identifier of the membership.
     * @returns The platform's delete response.
     * @throws {RestError} On any non-2xx HTTP response.
     */
    deleteMembership(membershipId: string): Promise<any>;
}