export interface IConfig {
    endPoint: string;
    grantType: string;
    clientId: string;
    clientSecret: string;
}
export declare enum QueryType {
    Find,
    Update,
    Delete,
    Insert,
}
export declare enum QueryNum {
    One,
    Many,
}
/**
 * Generate an event provider object to authenticate through OAuth2 before doing queries.
 *
 * @param config Configuration object related to the OAuth2 authentication.
 * @returns An event provider object. Each keys is an event handler function.
 */
export declare const OAuth2QueryTransformer: (config: IConfig) => {
    authenticate(this: any, url: string, params: object): Promise<void>;
    initialize(this: any): Promise<void>;
    beforeQuery(queryType: QueryType, queryNum: QueryNum, modelName: string, select: object, update: object, options: object, apiDesc: object): any;
};