Bug Report

• I would like to work on a fix!

Current behavior

Try it out link

It throws a syntax error Unexpected token, expected "," (2:27)

Input Code

class C {
  not_constructor(readonly foo: string) {}
}

Expected behavior

It throws a syntax error A parameter property is only allowed in a constructor implementation. like TypeScript TypeScript Playground link.

Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)

• Filename: babel.config.js

{
  "presets": ["@babel/preset-typescript"]
}

Environment

I don't think environment information is needed because this issue is simple, but I will provide it if it is needed for you guys.

Possible Solution

Additional context