Vue 2.7+ no longer fails on and report type errors in build and serve commands

Version

2.7.8

Reproduction link

github.com

Steps to reproduce

Based from the vuejs-type-bug-demo root folder:

• cd ./hello-world-2.6 && npm install && npm run build
• cd ./hello-world-2.7 && npm install && npm run build

What is expected?

In 2.7 I expect the errors in typing to fail the build as it does in 2.6

What is actually happening?

Succeeding the build without any errors thrown