// Type definitions for core/dispatcher

type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
type Merge<M, N> = Omit<M, Extract<keyof M, keyof N>> & N;

/**
 * Adds a new global event listener. Duplicate event handlers will be discarded.
 */
export function on(name: string, fn: Function, target: React.ReactNode): void;
/**
 * Removes a global event listener.
 */
export function off(name: string, fn: Function, target: React.ReactNode): void;
/**
 * Adds a new global event listener that removes itself after handling one event.
 */
export function once(
  name: string,
  fn: Function,
  target?: React.ReactNode,
): Function;