Not compatible with TypeScript 4.3+

Describe the bug

Not compatible with TypeScript 4.3+

When using TS4.3, there will be a lot of warnings. But 4.2 is correct.

[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders.
...

I didn’t write any code to modify the properties. Just use @Prop.

Desktop (please complete the following information):

• OS: MacOS 11.4
• Browser Chrome 91
• Version 9.1.2

[iwt-nduesing]

So the workaround is to add "useDefineForClassFields": false to the tsconfig.json like so:

{
  "compilerOptions": {
    "useDefineForClassFields": false
  },
}

So the result is, that classes are not working in the new ECMA way, but in the old TypeScript way.

[andrevmatos]

Mybe a workaround: https://github.com/microsoft/TypeScript/issues/44449#issuecomment-855257014