Explicit URL imports import the module when used with javascript files

[kallekankaanpaa]

Describe the bug

When trying to import the URL of a javascript file with the explicit URL import as described in the documentation the javascript module is imported rather than just the URL of the module.

This only happens when running the code with npm run dev the bundle built with npm run build works as expected.

Reproduction

https://stackblitz.com/edit/vitejs-vite-ubhupq?file=main.js

Steps to reproduce

1. npm install
2. npm run dev

System Info

System:
    OS: Linux 5.15 Ubuntu 22.04.4 LTS 22.04.4 LTS (Jammy Jellyfish)
    CPU: (8) x64 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
    Memory: 2.81 GB / 7.62 GB
    Container: Yes
    Shell: 5.1.16 - /bin/bash
  Binaries:
    Node: 20.12.2 - ~/.nvm/versions/node/v20.12.2/bin/node
    npm: 10.5.2 - ~/.nvm/versions/node/v20.12.2/bin/npm

Used Package Manager

npm

Logs

No response

Validations

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• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
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• The provided reproduction is a minimal reproducible example of the bug.

[stackblitz]

Start a new pull request in StackBlitz Codeflow.

• vitejs-vite-ubhupq (Open reproduction)