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@happy-autumn-40938?

My worker index.ts has only these imports:

import { GrowthBook } from "@growthbook/growthbook";
import { getPayloadFromKV } from "@growthbook/edge-cloudflare";

I don't have an answer on how to make CJS play nicely with vitest in this scenario, but I can look into it. Possibly dual export to ESM + CJS. I have had some success in the past via forcing modules / renaming test runners to

.mjs

Could you perhaps recommend a test suite which would not have such issues with growthbook?

You could perhaps try jest, although I don't particularly love recommending that. I'll be working on a new Edge SDK build over the next couple of weeks and will do some testing in vitest at that time. This may mean that the SDK will be dual-packaged for CJS and ESM.