The docs:

For extendEnv

Set to false if you don't want to extend the environment variables when providing the env property.

For env:

Environment key-value pairs. Extends automatically from process.env. Set extendEnv to false if you don't want this.

Having read this, I was under the impression that if you set extendEnv to false, env has no effect at all (which is exactl

It seems to throw on non-zero exit code. I would like to avoid wrapping in try/catch, and read the code.

The documentation has an example showing usage of the {code} in the result. This is confusing because you cannot read the code it if throws.