ex.nix

  shellcheckHook = makeSetupHook {
    name = "shellcheck-hook";
    substitutions = {};
  }
  (pkgs.writeText "foo" ''
    (
      # lol
      filename=$(cat "$0" | tail -n1   | ${pkgs.utillinux}/bin/rev | cut -d' ' -f2 | ${pkgs.utillinux}/bin/rev)
      ${pkgs.shellcheck}/bin/shellcheck -s bash "$filename"
    )
  '');

ex.sh

#!/usr/bin/env nix-shell
#!nix-shell -i bash -p shellcheckHook -I nixpkgs=./

foo=$1
echo $foo
echo $((1 + 1)))

grahamc@Morbo> ./test.sh 

In ./test.sh line 1:
#!/usr/bin/env nix-shell
^-- SC1008: This shebang was unrecognized. Note that ShellCheck only handles sh/bash/dash/ksh.


In ./test.sh line 5:
echo $foo
     ^-- SC2086: Double quote to prevent globbing and word splitting.


In ./test.sh line 6:
echo $((1 + 1)))
               ^-- SC1089: Parsing stopped here. Is this keyword correctly matched up?