💻

• Would you like to work on a fix?

How are you using Babel?

Programmatic API (babel.transform, babel.parse)

Input code

export const a = 1;
export const b = 2;
export const c = 13;
export const d = '41';
export const e = 15;
export const f = 71;

export const g = () => {
  return 1;
};

Configuration file name

.babelrc

Configuration

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": {
          "browsers": "ios 10"
        },
      },
    ],
  ]
}

Current and expected behavior

The output js includes a long assignment continuously to make every exports as void 0 before they got the real value assigned:

exports.g = exports.f = exports.e = exports.d = exports.c = exports.b = exports.a = void 0;

When too many exports, like more than 500 exports in my case, it would leads JSC(JavaScript Core) engine to thorw the error "Maximum call stack size exceeded" while the code running there.

Full js file output:

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.g = exports.f = exports.e = exports.d = exports.c = exports.b = exports.a = void 0;
var a = 1;
exports.a = a;
var b = 2;
exports.b = b;
var c = 13;
exports.c = c;
var d = '41';
exports.d = d;
var e = 15;
exports.e = e;
var f = 71;
exports.f = f;

var g = () => {
  return 1;
};

exports.g = g;

Environment

• Babel version: 7.17.0 (@babel/core 7.17.2)
• @babel/preset-env version: 7.16.11
• JavaScript Core Engine version: 7611.3.10.0.1

Possible solution

To limit the maximum initial assignments for every single expression might help, like 100.

It should be splitted as multiple assignment expressions if it over the limit.

Additional context

No response