WIP: flake.nix for the project

default.nix

@@ -0,0 +1,60 @@
+{ pkgs ? import <nixpkgs> { }, ... }:
+
+  let
+    lib = pkgs.lib;
+    haskellPkg = pkgName: pkgs.haskellPackages."${pkgName}";
+
+    mkDerivation = haskellPkg "mkDerivation";
+    aeson = haskellPkg "aeson";
+    ansi-terminal = haskellPkg "ansi-terminal";
+    ansi-wl-pprint = haskellPkg "ansi-wl-pprint_0_6_9";
+    async = haskellPkg "async";
+    base = haskellPkg "base_4_21_0_0";
+    boxes = haskellPkg "boxes";
+    bytestring = haskellPkg "bytestring_0_12_2_0";
+    containers = haskellPkg "containers_0_7";
+    directory = haskellPkg "directory_1_3_9_0";
+    filepath = haskellPkg "filepath_1_5_4_0";
+    formatting = haskellPkg "formatting";
+    Glob = haskellPkg "Glob";
+    hspec = haskellPkg "hspec";
+    hspec-core = haskellPkg "hspec-core";
+    HUnit = haskellPkg "HUnit";
+    language-javascript = haskellPkg "language-javascript";
+    mtl = haskellPkg "mtl_2_3_1";
+    optparse-applicative = haskellPkg "optparse-applicative";
+    process = haskellPkg "process_1_6_25_0"; 
+    purescript = haskellPkg "purescript"; 
+    QuickCheck = haskellPkg "QuickCheck"; 
+    safe = haskellPkg "safe";
+    text = haskellPkg "text_2_1_2";
+    transformers = haskellPkg "transformers_0_6_1_2";
+    unordered-containers = haskellPkg "unordered-containers";
+    utf8-string = haskellPkg "utf8-string";
+  in mkDerivation rec {
+    pname = "zephyr";
+    version = "5.3";
+    src = ./.;
+    isLibrary = true;
+    isExecutable = true;
+    libraryHaskellDepends = [
+      aeson ansi-terminal base boxes containers formatting language-javascript mtl purescript safe text unordered-containers
+    ];
+    executableHaskellDepends = [
+      aeson ansi-terminal ansi-wl-pprint async base bytestring containers
+      directory filepath formatting Glob language-javascript mtl
+      optparse-applicative purescript text transformers utf8-string
+    ];
+    testHaskellDepends = [
+      aeson base containers directory hspec hspec-core HUnit
+      language-javascript mtl optparse-applicative process purescript
+      QuickCheck text transformers
+    ];
+    testToolDepends = [ purescript ];
+    license = lib.licenses.mpl20;
+    description = "Zephyr, tree-shaking for the PureScript language";
+    homepage = "https://github.com/MaybeJustJames/zephyr";
+    maintainers = with pkgs.lib.maintainers; [ malik ];
+    hydraPlatforms = lib.platforms.none;
+    mainProgram = pname;
+  }

flake.nix

@@ -0,0 +1,19 @@
+{
+  description = "Flake utils demo";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let pkgs = nixpkgs.legacyPackages.${system}; in
+      {
+        packages = rec {
+          default = zephyr;
+          zephyr = import ./default.nix { inherit pkgs; };
+        };
+      }
+    );
+}

zephyr.cabal

@@ -65,18 +65,18 @@ library
     , Language.PureScript.DCE.Eval
     , Language.PureScript.DCE.Utils
   build-depends:
-      aeson                >=2.0.3.0  && <2.1
-    , ansi-terminal        >=0.11     && <0.12
-    , base                 >=4.16.2   && <4.17
+      aeson                >=2.1.2.1  && <2.2
+    , ansi-terminal        >=1.0.2     && <1.1
+    , base                 >=4.21.0.0   && <4.22
     , boxes                >=0.1.5    && <0.2
-    , containers           >=0.6.5.1  && <0.7
+    , containers           >=0.7  && <0.8
     , formatting
-    , language-javascript  ==0.7.0.0
-    , mtl                  >=2.2.2    && <2.3
-    , purescript           >=0.15.4   && <0.16
-    , safe                 >=0.3.19   && <0.4
-    , text                 >=1.2.5.0  && <1.3
-    , unordered-containers == 0.2.19.1
+    , language-javascript  ==0.7.1.0
+    , mtl                  >=2.3.1    && <2.4
+    , purescript           >=0.15.15   && <0.16
+    , safe                 >=0.3.21   && <0.4
+    , text                 >=2.1.2  && <2.2
+    , unordered-containers == 0.2.20
   default-language:    Haskell2010
 
 executable zephyr
@@ -106,23 +106,23 @@ executable zephyr
     -rtsopts
     -with-rtsopts -N2
   build-depends:
-      aeson                >=2.0.3.0   && <2.1
+      aeson                >=2.1.2.1   && <2.2
     , async
-    , ansi-terminal        >=0.11      && <0.12
+    , ansi-terminal        >=1.0.2      && <1.1
     , ansi-wl-pprint       >=0.6.9     && <0.7
-    , base                 >=4.16.2    && <4.17
-    , bytestring           >=0.11.3.1  && <0.12
-    , containers           >=0.6.5.1   && <0.7
-    , directory            >=1.3.6.2   && <1.4
-    , filepath             >=1.4.2.2   && <1.5
+    , base                 >=4.21.0.0    && <4.22
+    , bytestring           >=0.12.2.0  && <0.13
+    , containers           >=0.7   && <0.8
+    , directory            >=1.3.9.0   && <1.4
+    , filepath             >=1.5.4.0   && <1.6
     , formatting
     , Glob                 >=0.10.2    && <0.11
-    , language-javascript  ==0.7.0.0
-    , mtl                  >=2.2.2     && <2.3
-    , optparse-applicative >=0.17.0.0  && <0.18
-    , purescript           >=0.15.4    && <0.16
-    , text                 >=1.2.5.0   && <1.3
-    , transformers         >=0.5.6.2   && <0.6
+    , language-javascript  ==0.7.1.0
+    , mtl                  >=2.3.1     && <2.4
+    , optparse-applicative >=0.18.1.0  && <0.19
+    , purescript           >=0.15.15    && <0.16
+    , text                 >=2.1.2   && <2.2
+    , transformers         >=0.6.1.2   && <0.7
     , utf8-string          >=1.0.2     && <1.1
     , zephyr               >=0.5       && <0.6
   default-language:    Haskell2010
@@ -147,21 +147,21 @@ test-suite zephyr-test
     , Test.Karma
     , Test.Utils
   build-depends:
-      aeson                >=2.0.3.0   && <2.1
-    , base                 >=4.16.2    && <4.17
-    , containers           >=0.6.5.1   && <0.7
-    , directory            >=1.3.6.2   && <1.4
+      aeson                >=2.1.2.1   && <2.2
+    , base                 >=4.21.0.0    && <4.22
+    , containers           >=0.7   && <0.8
+    , directory            >=1.3.9.0   && <1.4
     , hspec
-    , hspec-core           <2.9.3
+    , hspec-core
     , HUnit
-    , language-javascript  ==0.7.0.0
-    , mtl                  >=2.2.2     && <2.3
-    , optparse-applicative ==0.17.0.0
-    , process              ==1.6.13.1
-    , purescript           >=0.15.4    && <0.16
-    , QuickCheck           >=2.12.1
-    , text                 >=1.2.5.0   && <1.3
-    , transformers         >=0.5.6.2   && <0.6
+    , language-javascript  ==0.7.1.0
+    , mtl                  >=2.3.1     && <2.4
+    , optparse-applicative ==0.18.1.0
+    , process              ==1.6.25.0
+    , purescript           >=0.15.15    && <0.16
+    , QuickCheck           >=2.14.3
+    , text                 >=2.1.2   && <2.2
+    , transformers         >=0.6.1.2   && <0.7
     , zephyr               >=0.5       && <0.6
   build-tool-depends:
       purescript:purs