export declare namespace action {
    /**
     * var middleware = {
     *  name: 'userId checker',
     *  global: false,
     *  priority: 1000,
     *  preProcessor: async (data) => {
     *    if(!data.params.userId){
     *      throw new Error('All actions require a userId')
     *    }
     *  },
     *  postProcessor: async (data) => {
     *    if(data.thing.stuff == false){ data.toRender = false }
     *  }
     *}
     */
    interface ActionMiddleware {
        /**Unique name for the middleware. */
        name: string;
        /**Is this middleware applied to all actions? */
        global: boolean;
        /**Module load order. Defaults to `api.config.general.defaultMiddlewarePriority`. */
        priority?: number;
        /**Called before the action runs.  Has access to all params, before sanitization.  Can modify the data object for use in actions. */
        preProcessor?: Function;
        /**Called after the action runs. */
        postProcessor?: Function;
    }
    /**
     * Add a middleware component available to pre or post-process actions.
     */
    function addMiddleware(data: ActionMiddleware): void;
    /**
     * Run an Action in-line, perhaps from within another Action or Task.
     */
    function run<ActionClass>(actionName: string, actionVersion?: string | number, params?: {
        [key: string]: any;
    }, connectionProperties?: {}): Promise<{
        [key: string]: any;
    }>;
}