import type { Client } from 'urql';
declare module 'piral-core/lib/types/custom' {
    interface PiletCustomApi extends PiletGqlApi {
    }
}
export type UrqlClient = Client;
export interface GqlUnsubscriber {
    /**
     * Removes (i.e., unsubscribes from) the created subscription.
     */
    (): void;
}
export interface GqlSubscriber<T> {
    /**
     * Function to be called when new data is received.
     */
    (data: T, error?: Error): void;
}
export interface GqlOperationOptions {
    /**
     * Defines the additional headers to use.
     */
    headers?: any;
}
export interface GqlQueryOptions extends GqlOperationOptions {
    /**
     * The variables to be used in the query.
     */
    variables?: Record<string, any>;
    /**
     * Defines the cache mode of the query.
     */
    cache?: 'cache-first' | 'cache-only' | 'network-only' | 'cache-and-network';
}
export interface GqlMutationOptions extends GqlOperationOptions {
    /**
     * The variables to be used in the query.
     */
    variables?: Record<string, any>;
}
export interface GqlSubscriptionOptions extends GqlOperationOptions {
    /**
     * The variables to be used in the subscription.
     */
    variables?: Record<string, any>;
}
export interface PiletGqlApiQuery {
    <T = any>(query: string, options?: GqlQueryOptions): Promise<T>;
}
export interface PiletGqlApiMutate {
    <T = any>(mutation: string, options?: GqlMutationOptions): Promise<T>;
}
export interface PiletGqlApiSubscribe {
    <T = any>(subscription: string, subscriber: GqlSubscriber<T>, options?: GqlSubscriptionOptions): GqlUnsubscriber;
}
export interface PiletGqlApi {
    /**
     * Executes the given GraphQL query.
     * @param query The GraphQL query.
     * @param options Options for the query.
     */
    query: PiletGqlApiQuery;
    /**
     * Executes the given GraphQL mutation.
     * @param mutation The GraphQL mutation query.
     * @param options Options for the mutation.
     */
    mutate: PiletGqlApiMutate;
    /**
     * Establishes the given GraphQL subscription.
     * @param subscription The GraphQL subscription query.
     * @param subscriber The callback to use when data is received.
     * @param options Options for the subscription.
     */
    subscribe: PiletGqlApiSubscribe;
}