💻

• Would you like to work on a fix?

How are you using Babel?

Other (Next.js, Gatsby, vue-cli, ...)

Input code

// self.mjs
import { a } from "./self.mjs";

export const [b, c = a] = [2];

export { b as a }

console.log(a, b, c);

Configuration file name

No response

Configuration

N/A

Current and expected behavior

output code:

For ease of direct execution, the filename has been renamed to self.cjs.

// self.cjs
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.c = exports.b = exports.a = void 0;
var _self = require("./self.cjs");
const [b, c = _self.a] = [2];
exports.c = c;
exports.a = exports.b = b;
console.log(_self.a, b, c);

Expected behavior: print 2 2 2
Current behavior: print 2 2 undefined

Environment

N/A

Possible solution

Two optional solutions:

1. Downgrade destructuring syntax before converting ESM to CJS
2. Use the define getter approach like SWC/ESBuild (click the link to see playground)

Additional context

No response