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1'use strict'2const EventEmitter = require('node:events')3 4class Dispatcher extends EventEmitter {5  dispatch () {6    throw new Error('not implemented')7  }8 9  close () {10    throw new Error('not implemented')11  }12 13  destroy () {14    throw new Error('not implemented')15  }16 17  compose (...args) {18    // So we handle [interceptor1, interceptor2] or interceptor1, interceptor2, ...19    const interceptors = Array.isArray(args[0]) ? args[0] : args20    let dispatch = this.dispatch.bind(this)21 22    for (const interceptor of interceptors) {23      if (interceptor == null) {24        continue25      }26 27      if (typeof interceptor !== 'function') {28        throw new TypeError(`invalid interceptor, expected function received ${typeof interceptor}`)29      }30 31      dispatch = interceptor(dispatch)32 33      if (dispatch == null || typeof dispatch !== 'function' || dispatch.length !== 2) {34        throw new TypeError('invalid interceptor')35      }36    }37 38    return new ComposedDispatcher(this, dispatch)39  }40}41 42class ComposedDispatcher extends Dispatcher {43  #dispatcher = null44  #dispatch = null45 46  constructor (dispatcher, dispatch) {47    super()48    this.#dispatcher = dispatcher49    this.#dispatch = dispatch50  }51 52  dispatch (...args) {53    this.#dispatch(...args)54  }55 56  close (...args) {57    return this.#dispatcher.close(...args)58  }59 60  destroy (...args) {61    return this.#dispatcher.destroy(...args)62  }63}64 65module.exports = Dispatcher66