[Feature] Importing Amber variables

[Thesola10]

Is your feature request related to a problem? Please describe.
Currently, the only way to share values between Amber files (i.e. the global scope) is to declare an environment variable. This has the disadvantage of hindered discoverability: There is now a shared assumption being the name of the variable, which escapes compiler analysis.

Describe the solution you'd like
The ability to specify pub let ..., which makes the Amber variable into a singleton, which can be imported into any other file that requires it.

The technical aspect would likely involve reusing the same internal name across importers of the variable in the compiled script.

Describe alternatives you've considered
As above, an environment variable works, but the lack of compiler analysis makes it a possible avenue for issues.

An alternative is to export a getter/setter for the scoped variable, but it is unclear whether successive imports of a file preserve the required scope.

Fully global variables are a possible solution, but the module relationship isn't explicitly stated as it would with an import.

Additional context
This is what I'm currently working on. This suggestion would replace instances of env_var_get(), in src/cli.ab for instance, allowing it to import values loaded in src/main.ab

[b1ek]

i like the idea of exporting a variable, with this syntax which i think is what you meant too:

// file1.ab
pub let word = "Amber";

// file2.ab
import { word } from "./file1";
echo word // stdout: Amber

the compiler limitations concerns are valid, but i wouldn't focus on them too much until an implementation is in the works