bug: Build error when using uniwind/metro with esm metro config

[stevezhu]

What happened?

When using any esm metro config such as metro.config.mjs, metro.config.ts (react/metro#1560) or setting "type": "module", I get the following error when running the metro/expo build.

> uniwind-esm-import-repro@1.0.0 start /<dev>/uniwind-esm-import-repro
> expo start

Starting project at /<dev>/uniwind-esm-import-repro
Using src/app as the root directory for Expo Router.
TypeError: Error loading Metro config at: /<dev>/uniwind-esm-import-repro/metro.config.ts
Class extends value #<Object> is not a constructor or null
TypeError: Class extends value #<Object> is not a constructor or null
    at file:///<dev>/uniwind-esm-import-repro/node_modules/uniwind/dist/metro/index.mjs:8:25
    at ModuleJobSync.runSync (node:internal/modules/esm/module_job:534:37)
    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:382:47)
    at loadESMFromCJS (node:internal/modules/cjs/loader:1626:24)
    at Module._compile (node:internal/modules/cjs/loader:1791:5)
    at Object..js (node:internal/modules/cjs/loader:1940:10)
    at Module.load (node:internal/modules/cjs/loader:1530:32)
    at Module._load (node:internal/modules/cjs/loader:1332:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:255:19)
    at Module.require (node:internal/modules/cjs/loader:1553:12)
 ELIFECYCLE  Command failed with exit code 1.

The issue goes away when I patch the uniwind exports to specifically use the cjs build.

file: uniwind/package.json

        "./metro": {
            "types": "./dist/metro/index.d.ts",
+           "node": "./dist/metro/index.cjs",
            "import": "./dist/metro/index.mjs",
            "default": "./dist/metro/index.cjs"
        },

Steps to Reproduce

In the repro repository:

1. pnpm install
2. pnpm start

Snack or Repository Link

https://github.com/stevezhu/uniwind-esm-import-repro

Uniwind version

1.3.0

React Native Version

0.83.1

Platforms

iOS, Android, Web

Expo

Yes

Additional information

• I've searched for similar issues in this repository and found none

[github-actions]

This issue has been automatically closed because it lacks a clear, minimal reproduction that we can use to verify the reported bug.

[jpudysz]

What's the problem?

[stevezhu]

What's the problem?

@jpudysz Sorry for the original barebones issue, I've added a reproduction repo and updated the details to more accurately reflect the actual error.