Move test/benchmark folders to dev-only environment so they don't take up space in prod

[RollingHog]

Is there any way to setup npm so it doesn't load those folders on production, maybe via tampering with package.json? Currently folders such as

• browser-version/test
• test
• benchmarks
• test_lac
  occupy up to 66%(800 MB) of package size, although they're definetely not needed in production. I know it sounds not too much, but in my case it's important. And wasn't this repo intended to be as little and dep-free as possible after all?

Btw if someone is wondering, I'm pretty sure maintainer is physically alive at least.