vue2.7, the options typings of defineComponent method is not inferred until a complete word is typed

Version

2.7.8

Reproduction link

github.com/Allenice/vue27

Steps to reproduce

• Open project in VS code

• use defineComponent to create component

• emits not show in suggestion list when I type em, even type emit

• emits show in suggestion list when I type emits

What is expected?

Option name should show in suggestion list when I type the first letter of any option

What is actually happening?

Option name not show in suggestion list until a complete word is typed