The way export const = gets compiled removes .name information when using commonjs

[Garethp]

TypeScript Version: 4.0.2

Search Terms:
export const name

Code

a.ts

import { b } from "./b";

console.log(b.name);

b.ts

export const b = () => "";

tsconfig.json

{
  "compilerOptions": {
    "strict": true,
    "module": "commonjs"
  },
  "include": ["."]
}

Expected behavior:
b.name is ""

b.ts should be compiled in a way that preserves the .name of b. Maybe something like this?

"use strict";
exports.__esModule = true;
const b = function () { return ""; }
exports.b = void 0;
exports.b = b;

Actual behavior:
b.name should be "b"

b.ts is compiled into

"use strict";
exports.__esModule = true;
exports.b = void 0;
exports.b = function () { return ""; };

Playground Link: https://www.typescriptlang.org/play?target=99&jsx=0&module=1#code/KYDwDg9gTgLgBAYwgOwM7wEZwLxwBQCUOAfHAERkDcQA

[MartinJohns]

Duplicate of #39819.

[Garethp]

Well that's embarrassing. It's also fixed already. Sorry for that

[MartinJohns]

Note that the milestone is set to TypeScript 4.1.0, so the fix is not released yet.