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• Would you like to work on a fix?

How are you using Babel?

@rollup/plugin-babel

Input code

https://babeljs.io/repl#?browsers=last%203%20versions%2C%20not%20dead&build=&builtIns=false&corejs=3.21&spec=false&loose=false&code_lz=GYVwdgxgLglg9mABAEwKYTgJwIZVQYQBtsBnEgCim0wHNUoAaRDMPADygEpEBvAKAC-fPqEiwEKdFlyoAghAioyWStTqNmCdl16DhAATQYceIqRJ8IxMogAqSqLsSJDUk3IVKSWRCSqwIRGxPZUxEYDg4RABeRAAWACYAbj0-AHo0xAA-RABlAE9WbDYAUUxMLAAuRExUYFRayFREKCjwI2Ja5EQAB0wYADcZcJhUQm6fAFt6AAs4boBiWSA&debug=false&forceAllTransforms=false&modules=false&shippedProposals=false&circleciRepo=&evaluate=true&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env&prettier=false&targets=&version=7.24.3&externalPlugins=%40babel%2Fplugin-proposal-decorators%407.24.0&assumptions=%7B%7D

function decorateClass(target, context) {
}

function decorateAccessor(target, context) {
}

@decorateClass
class Test {
  @decorateAccessor static accessor foo = 42;
}

// > SyntaxError: reference to undeclared private field or method #A

Configuration file name

babel.config.mjs

Configuration

/* eslint-env node */

const config = {
  presets: [
    ["@babel/preset-env", {}],
    ["@babel/preset-typescript", { allowDeclareFields: true }],
    // See https://github.com/babel/babel/issues/16373#issuecomment-2013163733
  ],
};

if (process.env.NODE_ENV === "test") {
  config.plugins = [
    [
      "@babel/plugin-proposal-decorators",
      {
        version: "2023-11",
      },
    ],
  ];
}

export default config;

Current and expected behavior

Current behavior: with targets set to last 3 versions, not dead, the generated code throws a syntax error in Firefox. This may be a Firefox problem rather than a Babel problem. Tested with Firefox 124.0.1 (64-bit) and Nightly 126.0a1 (2024-03-24) (64-bit).

Expected behavior: no syntax error in any browser

Environment

• System:
  • OS: Linux 6.5 Ubuntu 22.04.4 LTS 22.04.4 LTS (Jammy Jellyfish)
• Binaries:
  • Node: 20.11.0 - ~/.volta/tools/image/node/20.11.0/bin/node
  • npm: 10.2.4 - ~/.volta/tools/image/node/20.11.0/bin/npm
• npmPackages:
  • @babel/cli: ^7.22.5 => 7.24.1
  • @babel/core: ^7.22.1 => 7.24.3
  • @babel/plugin-proposal-decorators: ^7.22.3 => 7.24.1
  • @babel/preset-env: ^7.22.4 => 7.24.3
  • @babel/preset-typescript: ^7.21.5 => 7.24.1
  • eslint: ^8.41.0 => 8.57.0

Possible solution

No response

Additional context

No response