/**
 * Wraps a function in order to emit events on start, end, and error.
 * @param {Object} [emitter] - The desired emitter for events emitted by the wrapper. Defaults to the global emitter.
 * @param {boolean} always - If `true`, emit events even if already emitting an event.
 * @returns {function} The wrapped function.
 */
export function createWrapperWithEmitter(emitter?: Object, always: boolean, agentRef: any): Function;
/**
 * Copies properties from one object to another. Used for creating a wrapper function from an original function and for
 * copying an original function to a property of a wrapper function named by `flag` in the executing context.
 * @param {Object} from - The source function or object.
 * @param {Object} to - The destination function or object.
 * @param {Object} [emitter] - The (optional) desired event emitter if errors are encountered while copying.
 *     Defaults to the global event emitter.
 * @returns {object} - The destination founction or object with copied properties.
 */
export function copy(from: Object, to: Object, emitter?: Object): object;
export const flag: string;
export default createWrapperWithEmitter;
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