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[Bug]: rolldown -c -w parse -w as config #3248

@phk422

Description

@phk422

Reproduction link or steps

Repo: https://github.com/phk422/rolldown-demo
Running pnpm dev works fine.
However, running pnpm dev2 results in an error.

What is expected?

The rolldow.config configuration can be correctly identified using pnpm dev2

What is actually happening?

The following error occurs with pnpm dev2:

> rolldown -c -w

Error: Error happened while loading config.
    at loadConfig (file:///D:/hk-project/rolldown-demo/node_modules/.pnpm/rolldown@1.0.0-beta.1/node_modules/rolldown/dist/esm/cli.mjs:352:9)
    at bundleWithConfig (file:///D:/hk-project/rolldown-demo/node_modules/.pnpm/rolldown@1.0.0-beta.1/node_modules/rolldown/dist/esm/cli.mjs:359:23)
    ... 4 lines matching cause stack trace ...
    at async importModuleDynamicallyWrapper (node:internal/vm/module:429:15) {
  [cause]: Error: Unsupported config format. Expected: `.js,.mjs,.cjs,.ts,.mts,.cts` but got ``
      at loadConfig (file:///D:/hk-project/rolldown-demo/node_modules/.pnpm/rolldown@1.0.0-beta.1/node_modules/rolldown/dist/esm/cli.mjs:350:12)
      at bundleWithConfig (file:///D:/hk-project/rolldown-demo/node_modules/.pnpm/rolldown@1.0.0-beta.1/node_modules/rolldown/dist/esm/cli.mjs:359:23)
      at main (file:///D:/hk-project/rolldown-demo/node_modules/.pnpm/rolldown@1.0.0-beta.1/node_modules/rolldown/dist/esm/cli.mjs:2004:9)
      at file:///D:/hk-project/rolldown-demo/node_modules/.pnpm/rolldown@1.0.0-beta.1/node_modules/rolldown/dist/esm/cli.mjs:2017:1
      at ModuleJob.run (node:internal/modules/esm/module_job:195:25)
      at async ModuleLoader.import (node:internal/modules/esm/loader:336:24)
      at async importModuleDynamicallyWrapper (node:internal/vm/module:429:15)

System Info

System:
    OS: Windows 10 10.0.17763
    CPU: (12) x64 Intel(R) Core(TM) i5-10500 CPU @ 3.10GHz
    Memory: 13.07 GB / 31.83 GB
  Binaries:
    Node: 18.19.1 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.22 - ~\AppData\Local\pnpm\yarn.CMD
    npm: 10.2.4 - C:\Program Files\nodejs\npm.CMD
    pnpm: 7.33.6 - C:\Program Files\nodejs\pnpm.CMD
  Browsers:
    Internet Explorer: 11.0.17763.2989
  npmPackages:
    rolldown: 1.0.0-beta.1 => 1.0.0-beta.1

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