dify/web/context/event-emitter.ts

'use client'

import type { EventEmitter } from 'ahooks/lib/useEventEmitter'
import { createContext, useContext } from 'use-context-selector'

/**
 * Typed event object emitted via the shared EventEmitter.
 * Covers workflow updates, prompt-editor commands, DSL export checks, etc.
 */
export type EventEmitterMessage = {
  type: string
  payload?: unknown
  instanceId?: string
}

export type EventEmitterValue = string | EventEmitterMessage

export const EventEmitterContext = createContext<{ eventEmitter: EventEmitter<EventEmitterValue> | null }>({
  eventEmitter: null,
})

export const useEventEmitterContextContext = () => useContext(EventEmitterContext)