💻

• Would you like to work on a fix?

How are you using Babel?

babel-loader (webpack)

Input code

abstract class A {
    abstract prop: string;
}

class B extends A {
     get prop() {}
     set prop(value: string) {
         // shoud not to be called
     }
}

Configuration file name

No response

Configuration

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "useBuiltIns": "usage",
        "corejs": "3.27.1",
        "modules": false
      }
    ],
    [
      "@babel/preset-typescript",
      {
        "allowDeclareFields": true
      },
    ],
  ],
  "assumptions": {
    "setPublicClassFields": true,
   }
}

Current and expected behavior

Expected:
Constructor of abstract class shoudn't initialize abstract properties. Like in TypeScript.

Actual:
It initialized abstract properties and call setter on child class (in my environment it cause error, because some other properties doexn't initilized at this time)

Environment

System:
OS: Windows 10 10.0.22621
Binaries:
Node: 16.19.0
npm: 8.19.3
npmPackages:
@babel/core: ^7.20.7 => 7.20.12
@babel/preset-env: ^7.20.2 => 7.20.2
@babel/preset-typescript: ^7.18.6 => 7.18.6
babel-loader: ^9.1.0 => 9.1.2
webpack: ^5.75.0 => 5.75.0

Possible solution

No response

Additional context

There was a simmilar issue: #11542
But on that time TypeScript generates initializers for abstract properties. But since version 4.2 it didn't.