[TS] Exporting Namespace Aliases Breaks export = Syntax

[manuth]

Describe the bug

Exporting namespace aliases (using the export import = ...-syntax) breaks the use of the export = syntax.

Input code

meta.ts

export const version = "1.0.0";

nameof.ts

import * as meta from "./meta.js";

function nameof(obj: unknown) { }

namespace nameof {
    export import version = meta.version;
}

export = nameof;

Config

{
    "jsc": {
        "parser": {
            "syntax": "typescript",
            "isModule": false
        }
    },
    "module": "commonjs"
}

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.7.35&code=H4sIAAAAAAAAA8tLzE0tLkhMTlXITS1JVKjmUgCC1IqC%2FKISheT8vOIShbLUouLM%2FDwFWwUlQz0DPQMla65aLq48uD4QKz8NVWdmLphCaAUZrgflgvVDFUJkrLkA%2BHamM4cAAAA%3D&config=H4sIAAAAAAAAA1WPSw7DMAhE9z6FxbrbbnqHHsJySeTIPwGRakW5e%2B3UTpsdzAw82JTWsLCFh95qWZtsiJHOvipcoph3VUBKRrbkssBtuMLNmoxnPKT964AYmlHaFPK9x8GnxDjiXQsuuqn8A20KmZD5GmxRE2ePV5zqSAjptR5mf6Qd2%2FB1W0hxYfglB%2FHcDo6fY1xoRbV%2FALu7P%2BkZAQAA

SWC Info output

    Operating System:
        Platform: linux
        Arch: x64
        Machine Type: x86_64
        Version: #1 SMP PREEMPT_DYNAMIC Fri, 04 Oct 2024 21:51:11 +0000
        CPU: (32 cores)
            Models: AMD Ryzen Threadripper 2950X 16-Core Processor

    Binaries:
        Node: 22.9.0
        npm: 10.8.3
        Yarn: 1.22.22
        pnpm: N/A

    Relevant Packages:
        @swc/core: 1.7.35
        @swc/helpers: N/A
        @swc/types: 0.1.13
        typescript: 5.6.3

    SWC Config:
        output: N/A
        .swcrc path: N/A

    Next.js info:
        output: N/A

Expected behavior

Output should equal to the one in TypeScript Playground:
https://www.typescriptlang.org/play/?module=1#code/HYQwtgpgzgDiDGEAEkAuIkG8BQS9IgA8YB7AJ1SXhOCkoDcIyoBLGpAXiQCIBGAOgAMQ7gG5sAX2zZQkWAmSyIJAGZZc+IqQpIWYbQyat2XNCH6NmbYOKnYt5SlyWrxQA

"use strict";
var meta;
(function (meta) {
    meta.version = "1.0.0";
})(meta || (meta = {}));
var nameof;
(function (nameof) {
    nameof.version = meta.version;
})(nameof || (nameof = {}));
module.exports = nameof;

Actual behavior

Following error is displayed:

  × An export assignment cannot be used in a module with other exported elements.
   ╭─[./packages/nameof/src/index.cts:9:1]
 6 │     export import version = meta.version;
 7 │ }
 8 │ 
 9 │ export = nameof;
   · ────────────────
   ╰────

Version

1.7.35

Additional context

A workaround which seems to work currently is using export const =, export var = or export let = instead of export import =.

Namespace aliases are documented here:
https://www.typescriptlang.org/docs/handbook/namespaces.html#aliases

[manuth]

Wow - that was fast!
Thank you guys so much 😄

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.