[BUG?] changing an asset doesn't reload the app using new URL syntax (dev mode)

[lifaon74]

Describe the bug

When running vitejs in dev mode:

If you load an asset using fetch(new URL('./some-image.png, import.meta.url).href), the app is expected to reload when the asset changes. However nothing appends.

function run() {
  const url = new URL('./markdown.md', import.meta.url).href;
  console.log(`reload: ${Date.now()} - ${url}`);
}

run();

https://stackblitz.com/edit/vite-jeafy9?file=main.ts

On my point of view, the app should reload if the imported assets change. It may be useful if we have, for example, a markdown to html preview component. Currently, if we update the .md file, nothing happen.

Reproduction

https://stackblitz.com/edit/vite-jeafy9?file=main.ts

System Info

System:
    OS: Linux 5.4 Zorin OS 15.3
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Memory: 1.36 GB / 31.00 GB
    Container: Yes
    Shell: 4.4.20 - /bin/bash
  Binaries:
    Node: 14.9.0 - ~/.nvm/versions/node/v14.9.0/bin/node
    Yarn: 1.22.5 - /usr/bin/yarn
    npm: 6.14.8 - ~/.nvm/versions/node/v14.9.0/bin/npm
  Browsers:
    Firefox: 93.0
  npmPackages:
    vite: ^2.5.7 => 2.5.7

Used Package Manager

yarn

Logs

No response

Validations

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• Read the Contributing Guidelines.
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• The provided reproduction is a minimal reproducible example of the bug.