Document using the same Package in an Executable

[jkarni]

For compiled languages especially, I'd like to be able to do something like this:

import * as garn from "http://localhost:8777/mod.ts";
import * as nixpkgs from "http://localhost:8777/nixpkgs.ts";

export const helloFromHaskell = garn.haskell
  .mkHaskellProject({
    description: "My haskell executable",
    executable: "helloFromHaskell",
    compiler: "ghc94",
    src: ".",
  })
  .addExecutable("foo")`${helloFromHaskell.pkg}/bin/helloFromHaskell`;

But this doesn't work because the variable is used before it is assigned.

We can separate it out into two steps:

import * as garn from "http://localhost:8777/mod.ts";
import * as nixpkgs from "http://localhost:8777/nixpkgs.ts";

const helloFromHaskell = garn.haskell
  .mkHaskellProject({
    description: "My haskell executable",
    executable: "helloFromHaskell",
    compiler: "ghc94",
    src: ".",
  })

export const helloFromHaskell2 = helloFromHaskell
  .addExecutable("foo")`${helloFromHaskell.pkg}/bin/helloFromHaskell`;

But it's not obvious that this is what we need to do (it's not obvious the .add methods don't mutate the object, for example, and that we shouldn't be using a var), so it'd be nice to document this somewhere (e.g. a cookbook).

[soenkehahn]

With #372 our recommendation may change.