Codium build almost works

flake-compat.nix

@@ -0,0 +1,9 @@
+let
+  lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+  inherit (lock.nodes.flake-compat.locked) owner repo rev narHash;
+  flake-compat = builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz";
+    sha256 = narHash;
+  };
+in
+import flake-compat { src = ./.; }

flake.lock

@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1641205782,
+        "narHash": "sha256-4jY7RCWUoZ9cKD8co0/4tFARpWB+57+r1bLLvXNJliY=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b7547d3eed6f32d06102ead8991ec52ab0a4f1a7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1647893727,
@@ -18,6 +34,7 @@
     },
     "root": {
       "inputs": {
+        "flake-compat": "flake-compat",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -3,11 +3,16 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
   };
 
   outputs =
     { self
     , nixpkgs
+    , flake-compat
     }:
     let
       # Generate a user-friendly version number.
@@ -32,37 +37,36 @@
           pkgs = nixpkgsFor."${system}";
         in
         {
-          # In case we don't want to provide an editor, this defaultShell will
-          # provide only coq packages we need.
+          # In case we don't want to provide an editor, this defaultShell will provide only coq packages we need.
           defaultShell = pkgs.mkShell {
             buildInputs = with pkgs; [
               yarn
-            ];
-          };
-          # This is the defaultShell, but overriden to add one additional buildInput,
-          # vscodium!
-          vscodium = self.devShells.${system}.defaultShell.overrideAttrs (old: {
-            buildInputs =
-              let
-                vscodeWithRescript = pkgs.vscode-with-extensions.override {
+              (pkgs.vscode-with-extensions.override {
                   vscode = pkgs.vscodium;
                   vscodeExtensions = pkgs.vscode-utils.extensionsFromVscodeMarketplace [
+#                    {
+#                      name = "rescript-vscode";
+#                      publisher = "rescript-lang";
+#                      version = "1.2.1";
+#                      # sha256 = "sha256-b0gCaEzt5yAj53oLFZSXSD3bum9J1fYes/uf9+OlUek=";
+#                    }
                     {
-                      name = "rescript-vscode";
-                      publisher = "rescript-lang";
-                      version = "1.2.1";
-                      sha256 = "sha256-b0gCaEzt5yAj53oLFZSXSD3bum9J1fYes/uf9+OlUek=";
+                      name = "vim";
+                      publisher = "vscodevim";
+                      version = "1.22.2";
+                      sha256 = "sha256-dtIlgODzRdoMKnG9050ZcCX3w15A/R3FaMc+ZylvBbU=";
+                    }
+                    {
+                      name = "vscode-typescript-next";
+                      publisher = "ms-vscode";
+                      version = "4.7.20220323";
+                      sha256 = "sha256-mjiBCyg5As/XAU9I5k6jEZWGJA3P6P5o1roe2bS7aUI=";
                     }
                   ];
-                };
-              in
-              old.buildInputs
-              ++ [
-                vscodeWithRescript
-              ];
-          });
-          defaultPackage.${system} = self.packages.${system}.yarn;
-        });
-      defaultPackage.x86_64-linux = self.devShells.defaultPackage.x86_64-linux;
+              })
+            ];
+          };
+        }
+      );
     };
 }