Method off

packages/editor/src/plugin/emitter.ts:94–124

(type: string | number, listener: Listener)

  }

  off(type: string | number, listener: Listener): this {
    const list = this.events[type]
    if (list === undefined) return this

    if (list === listener) {
      if (--this.eventsCount === 0) this.events = {}
      else {
        delete this.events[type]
      }
    } else if (typeof list !== 'function') {
      let position = -1

      for (let i = list.length - 1; i >= 0; i--) {
        if (list[i] === listener) {
          position = i
          break
        }
      }

      if (position < 0) return this

      if (position === 0) list.shift()
      else {
        list.splice(position, 1)
      }

      if (list.length === 1) this.events[type] = list[0]
    }

    return this
  }

  once(type: string | number, listener: Listener, prepend = false): this {
    const wrapper = (...args: any[]) => {