How can I get environment variables in wasm js? I ...

# webassembly

[spierce7]

How can I get environment variables in wasm js? I assume that accessing the js side of process.env is necessary, but the interop of the js function requires a static string, so I'm not seeing how to properly access it via js interop.

[ephemient]

fun getenv(name: String): String = js("process.env[name] ?? ''")

[spierce7]

Thanks for the response! No matter what it's not happy though:

fun getenv(name: String): String? {
    return js("process?.env?.[name]")
}

Calls to 'js(code)' should be a single expression inside a top-level function body or a property initializer in Kotlin/Wasm.

This is just a function in a file, so I'm not seeing how we aren't meeting this criteria.

[ephemient]

use = and I think ? return doesn't work

[Michael Paus]

I hope that doesn’t work for wasmJs 😱

[Oleg Yukhnevich]

Here is how I've implemented it in ktor not so long ago

[Yoonho Aaron Kim]

Did you find any solution?

I have a same issue.

// commonMain
expect val SERVER_DOMAIN: String


// wasmJsMain
actual val SERVER_DOMAIN: String
    get() {
        return js("process.env[KTOR_HOST]")
    }

Build Fail: 'js(code)' should be a single expression inside a top-level function body or a property initializer in Kotlin/Wasm.

[ephemient]

it'll work with a wrapper, e.g.

private fun getenv(name: String): String? = js("process.env[name]")
actual val SERVER_DOMAIN: String
    get() = getenv("KTOR_HOST")!!

[Yoonho Aaron Kim]

oh.. you're right!
compile error is solved!
But... runtime error comes here ;;