How to access process.env

[richardpickett]

I have a simple .js based library with a couple handy classes that are ran in the browser.

One of the classes accesses the env like this: process?.env?.SOME_VAR.

I use tsup src/index.js --format cjs,esm --dts --clean --minify to build the package and then npm publish.

When I don't use tsup and just cp all the .js into the dist folder, it works just fine, the class can access the env just fine.

But when I compile with tsup, the class can't access any values in process.env in the app that npm imports it.

What's the right way to (a) compile the package for publishing so that (b) when it's imported it can read process.env in the app which imports it.

[GarinZ]

@egoist please help up on this question. And I also want to know, if I set compile-time environment variables like tsup src/index.ts --env.NODE_ENV production, how could I get this variable in .ts files