Feature request: demo for background scripts?

[James-E-A]

I'm trying to use Snowpack to compile a WebExtension that has a background script that uses code from the npm Registry, but I'm getting some weird errors trying to run it:

$ npx snowpack build --watch --verbose
[17:03:34] [snowpack] run command: build

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: C:\Users\EdingtonJames\Desktop\cerdicator\node_modules\web-ext\index.js
require() of ES modules is not supported.
require() of C:\Users\EdingtonJames\Desktop\cerdicator\node_modules\web-ext\index.js from C:\Users\EdingtonJames\Desktop\cerdicator\node_modules\snowpack-plugin-web-ext\dist-node\index.js is a
n ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename C:\Users\EdingtonJames\Desktop\cerdicator\node_modules\web-ext\index.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from C:\Users\Eding
tonJames\Desktop\cerdicator\node_modules\web-ext\package.json.

    at new NodeError (node:internal/errors:363:5)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1126:13)
    at Module.load (node:internal/modules/cjs/loader:989:32)
    at Function.Module._load (node:internal/modules/cjs/loader:829:14)
    at Module.require (node:internal/modules/cjs/loader:1013:19)
    at require (node:internal/modules/cjs/helpers:93:18)
    at Object.<anonymous> (C:\Users\EdingtonJames\Desktop\cerdicator\node_modules\snowpack-plugin-web-ext\dist-node\index.js:7:14)
    at Module._compile (node:internal/modules/cjs/loader:1109:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1138:10)
    at Module.load (node:internal/modules/cjs/loader:989:32)
    at Function.Module._load (node:internal/modules/cjs/loader:829:14)
    at Module.require (node:internal/modules/cjs/loader:1013:19)
    at Object.require [as NATIVE_REQUIRE] (node:internal/modules/cjs/helpers:93:18)
    at loadPluginFromConfig (C:\Users\EdingtonJames\Desktop\cerdicator\node_modules\snowpack\lib\cjs\config.js:286:34)
    at C:\Users\EdingtonJames\Desktop\cerdicator\node_modules\snowpack\lib\cjs\config.js:316:24
    at Array.forEach (<anonymous>)

The codebase I'm trying this on can currently be got via:

git clone -b rewrite/npmtooling https://github.com/JamesTheAwesomeDude/cerdicator.git && cd cerdicator
npm install
npx snowpack build --watch --verbose

If background scripts are currently supported by this tool, could you include a minimum viable codebase example, like the one that you've currently got that demos browser actions? (Or are browser actions are the only extension page type currently supported?)