Disable define substitution

[arv]

I would like to minimize my code but keep process.env.NODE_ENV in the bundled resulting code.

I cannot figure out how to disable the automatic define when minimize is true

[evanw]

This is something that esbuild only does when platform is browser (which is the default). You can change it to either node or neutral to disable this: https://esbuild.github.io/api/#platform.