How does @emit guarantee the execution order of functions

[Rabbitzzc]

in vue2.x

// Parent
<div @hello="sayHello"></div> 
export default {
	method: {
		sayHello() {
			console.log('hello')
		}
	}
}
// Child
export default {
	methods: {
		sayWorld() {
			console.log('hi')
      this.$emit('hello')
      console.log('world')
		}
	}
}

Trigger the event, output hi hello world

in vue.2x by ts

// Child
@Component
export default class World extend Vue{
	@Emit()
	sayWorld() {
    console.log('hi')
    console.log('world')
  }
}

Trigger the event, outpu hello hi world

I want to know how @emit guarantees execution order hi hello world