vite does not package worker.js with `new Worker(new URL("./worker.js", import.meta.url)`

Describe the bug

If I use

const worker = new Worker(new URL("./worker.js", import.meta.url), {
  type: "module",
});

worker.js will not be packaged.

This is the recommended way to package a Worker according to vite: https://v3.vitejs.dev/guide/features.html.

Reproduction

Archive.zip

Steps to reproduce

pnpm install.

From the output, you can see that worker.js and sqlite3.wasm are not bundled.

The reason is that in defineImportMeta.mjs shipped by wxt, import.meta.url is replaced by self.location.href. This confused the bundler.

This seems to be related to #392. Personally, I don't think such substitution makes any sense on wxt level given such severe side effects, which confused vite's recommend pattern. If a user need this workaround for some packages, they may apply it themselves in their config. Once applied, it is hard to find and remove this define.

System Info

System:
    OS: Linux 6.18 EndeavourOS
    CPU: (16) x64 AMD Ryzen 7 5800X 8-Core Processor
    Memory: 84.63 GB / 125.73 GB
    Container: Yes
    Shell: 5.9 - /usr/bin/zsh
  Binaries:
    Node: 22.21.1 - /home/yichaozhou/.nix-profile/bin/node
    Yarn: 1.22.22 - /usr/bin/yarn
    npm: 10.9.4 - /home/yichaozhou/.nix-profile/bin/npm
    pnpm: 10.25.0 - /usr/bin/pnpm
  Browsers:
    Firefox: 146.0.1
    Firefox Developer Edition: 146.0.1
  npmPackages:
    wxt: ^0.20.6 => 0.20.13

Used Package Manager

pnpm

Validations

• 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.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

Start with the defineImportMeta.mjs substitution described in the report and reproduce the behavior using the linked Archive.zip with pnpm install. Compare the build output to confirm that worker.js and sqlite3.wasm are omitted. Done means the recommended new Worker(new URL(..., import.meta.url)) pattern packages both files without breaking the intended import.meta.url behavior.