Syntax error when defining a class member field in javascript

[arinmirza]

Describe the bug

I am trying to define a simple class with a member field in between the <style> tags of a svelte component.

Functions and the constructor work as expected, but when I define a member field, I get a syntax error.

Reproduction

class A {

  baz = 'baz';

  constructor() {
    this.foo = `foo`;
  }

}

This syntax error in this example can be reproduced in this Svelte REPL snippet.

Logs

No response

System Info

System:
    OS: Linux 5.15 Ubuntu 22.04.1 LTS 22.04.1 LTS (Jammy Jellyfish)
    CPU: (12) x64 Intel(R) Xeon(R) W-10855M CPU @ 2.80GHz
    Memory: 49.24 GB / 62.56 GB
    Container: Yes
    Shell: 5.1.16 - /bin/bash
  Binaries:
    Node: 18.12.1 - ~/.nvm/versions/node/v18.12.1/bin/node
    Yarn: 1.22.19 - ~/.asdf/shims/yarn
    npm: 8.19.2 - ~/.nvm/versions/node/v18.12.1/bin/npm
  Browsers:
    Chrome: 107.0.5304.110
    Firefox: 109.0

Severity

annoyance

[jasonlyu123]

Duplicate of #6592