Allow spreading config into `defineContentScript`

[aaronklinker-st]

Describe the bug

When I try to do this:

export default defineContentScript({
  ...SOME_SHARED_CONFIG,

  async main(ctx) {
    // ...
  }
})

I get the following error from wxt prepare:

WXT 0.20.13                                                                                                                                                                                                                                                                        10:05:35 AM
ℹ Generating types...
✖ Command failed after 1.390 s

 ERROR  Cannot read properties of undefined (reading 'name')                                                                                                                                                                                                                       10:05:37 AM

    at node_modules/.pnpm/wxt@0.20.13_@types+node@25.0.3_jiti@1.21.7_rollup@4.55.1_yaml@2.8.2/node_modules/wxt/dist/core/utils/transform.mjs:23:28
    at Array.filter (<anonymous>)
    at emptyMainFunction (node_modules/.pnpm/wxt@0.20.13_@types+node@25.0.3_jiti@1.21.7_rollup@4.55.1_yaml@2.8.2/node_modules/wxt/dist/core/utils/transform.mjs:22:107)
    at removeMainFunctionCode (node_modules/.pnpm/wxt@0.20.13_@types+node@25.0.3_jiti@1.21.7_rollup@4.55.1_yaml@2.8.2/node_modules/wxt/dist/core/utils/transform.mjs:4:3)
    at TransformPluginContext.handler (node_modules/.pnpm/wxt@0.20.13_@types+node@25.0.3_jiti@1.21.7_rollup@4.55.1_yaml@2.8.2/node_modules/wxt/dist/core/builders/vite/plugins/removeEntrypointMainFunction.mjs:12:27)
    at EnvironmentPluginContainer.transform (node_modules/.pnpm/vite@7.3.1_@types+node@25.0.3_jiti@1.21.7_yaml@2.8.2/node_modules/vite/dist/node/chunks/config.js:28797:51)
    at loadAndTransform (node_modules/.pnpm/vite@7.3.1_@types+node@25.0.3_jiti@1.21.7_yaml@2.8.2/node_modules/vite/dist/node/chunks/config.js:22670:26)

I can fix this by adding an optional chain operator here:

  // node_modules/wxt/dist/core/utils/transform.mjs
        mod.exports.default.$ast.arguments[0].properties = mod.exports.default.$ast.arguments[0].properties.filter(
-         (prop) => prop.key.name !== "main"
+         (prop) => prop.key?.name !== "main"
        );

Reproduction

See code above

Steps to reproduce

wxt prepare

System Info

System:
    OS: macOS 26.4.1
    CPU: (11) arm64 Apple M3 Pro
    Memory: 363.55 MB / 36.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.15.0 - /Users/aaron/.asdf/installs/nodejs/24.15.0/bin/node
    npm: 11.12.1 - /Users/aaron/.asdf/plugins/nodejs/shims/npm
    pnpm: 9.11.0 - /Users/aaron/.asdf/installs/nodejs/24.15.0/bin/pnpm
    bun: 1.3.13 - /Users/aaron/.bunv/bin/bun
    Deno: 2.7.14 - /opt/homebrew/bin/deno
  Browsers:
    Chrome Canary: 150.0.7863.0
    Safari: 26.4
  npmPackages:
    vite: ^7.3.1 => 7.3.1
    wxt: ^0.20.13 => 0.20.13

Used Package Manager

pnpm

Validations

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

[YashNayakk]

Hi! I'd like to investigate and work on this issue.