fix EM_CACHE problem in the flake instead

Author: fidgetingbits

Diff for: README.md

@@ -63,35 +63,11 @@ When working with WSL, the host vscode instance connects to a vscode server on t
 
 There is a `.envrc` file included to trigger the flake usage.
 
-As of 2023-09 emscripten seems to have some issues related to caching folder on
-Nix. After running the `yarn` command you will see something like this:
-
-```
-$ yarn add -D tree-sitter-nix
-[SNIPPED]
-OSError: [Errno 30] Read-only file system: '/nix/store/ykh9rm7z5mr248hsc408zr1csh6ss0vz-emscripten-3.1.42/share/emscripten/cache/symbol_lists.lock'
-make: *** [Makefile:63: vendor/web-tree-sitter/0.20.4/README.md] Error 1
-error Command failed with exit code 2.
-```
-
-In order to work around that error you will have to run the commands included below. Note the `/nix/store/` path comes from the error above.
-
-```bash
-$ cp -R /nix/store/ykh9rm7z5mr248hsc408zr1csh6ss0vz-emscripten-3.1.42/share/emscripten/cache/ ~/.emscripten_cache
-$ chmod u+rwX -R ~/.emscripten_cache
-$ export EM_CACHE=~/.emscripten_cache
-$ yarn add -D ...
-```
-
-See https://github.com/NixOS/nixpkgs/issues/139943 for background on this
-issue.
-
 In order to run `yarn compile` it will attempt to run `npx tree-sitter` which
 will fail. You can use `steam-run` instead:
 
 `steam-run yarn compile`
 
-
 ### Updating `web-tree-sitter`
 
 We build a custom version of `web-tree-sitter` to ensure that we can always use the latest version and fix any problems as they come up.

Diff for: flake.nix

@@ -18,10 +18,19 @@
       });
     in
     {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = with pkgs; [ node2nix nodejs pnpm yarn emscripten python310 steam-run];
-        };
-      });
+      devShells = forEachSupportedSystem
+        ({ pkgs }: {
+          default = pkgs.mkShell
+            {
+              packages = with pkgs; [ node2nix nodejs pnpm yarn emscripten python310 steam-run ];
+              # shellHook = ''
+              #   if [ ! -d $(pwd)/.emscripten_cache ]; then
+              #     cp -R ${pkgs.emscripten}/share/emscripten/cache/ $(pwd)/.emscripten_cache
+              #     chmod u+rwX -R $(pwd)/.emscripten_cache
+              #     export EM_CACHE=$(pwd)/.emscripten_cache
+              #   fi
+              # '';
+            };
+        });
     };
 }