referenced static property in class instance throws ReferenceError

[dnalborczyk]

Bug Report

Current behavior

the below code throws ReferenceError: B is not defined.

It works natively in node.js (latest/14.8.0) as well as TypeScript (latest/4.0)

Input Code

npx babel-node a.js

// b.js
exports.b = new (class B {
  static a = 0

  static b = B.a

  getB() {
    return B.b
  }
})()

// a.js
const { b } = require('./b.js')

console.log(b.getB())

// ReferenceError: B is not defined

Workaround

// b.js
class B {
  static a = 0

  static b = B.a

  getB() {
    return B.b
  }
}

exports.b = new B()

Expected behavior

should not throw an error.

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

• Filename: babel.config.js

'@babel/plugin-transform-typescript', {
    allowDeclareFields: true,
},
'@babel/plugin-proposal-class-properties',

• Babel version(s):
  "@babel/cli": "7.10.5",
  "@babel/core": "7.11.4",
  "@babel/node": "7.10.5",
  "@babel/plugin-proposal-class-properties": "7.10.4",
  "@babel/plugin-transform-typescript": "7.11.0",

• Node/npm version: 14.8.0

• OS: macOS 10.15.6

[babel-bot]

Hey @dnalborczyk! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite."

[nicolo-ribaudo]

Fixed by #13429