require-ing a json file breaks vitest

[threepointone]

What versions & operating system are you using?

wrangler@4.22.0, @cloudflare/vitest-pool-workers

Please provide a link to a minimal reproduction

https://github.com/threepointone/test-vitest-workers-json-require

Describe the Bug

A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.

Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.

(like here: https://unpkg.com/ajv@8.17.1/dist/core.js)

This works when we do wrangler dev or vite dev, but fails when we run vitest.

Repro

npm install && npm test

Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.

Workaround:

add it to the deps section of vitest.config.ts

Please provide any relevant error logs

No response

[threepointone]

probably the same issue here #9405