Try #1506:

Author: iohk-bors[bot]

ci.nix

@@ -11,6 +11,7 @@
   inherit (pkgs.haskell-nix) sources;
   nixpkgsVersions = {
     "R2111" = "nixpkgs-2111";
+    "R2205" = "nixpkgs-2205";
     "unstable" = "nixpkgs-unstable";
   };
   compilerNixNames = nixpkgsName: nixpkgs: builtins.mapAttrs (compiler-nix-name: runTests: {
@@ -26,6 +27,9 @@
     nixpkgs.lib.optionalAttrs (nixpkgsName == "R2111") {
       ghc865 = false;
       ghc8107 = true;
+    } // nixpkgs.lib.optionalAttrs (nixpkgsName == "R2205") {
+      ghc865 = false;
+      ghc8107 = true;
     } // nixpkgs.lib.optionalAttrs (nixpkgsName == "unstable") {
       ghc865 = false;
       ghc884 = false; # Native version is used to boot 9.0.1

flake.lock

@@ -6,6 +6,7 @@
     nixpkgs-2003 = { url = "github:NixOS/nixpkgs/nixpkgs-20.03-darwin"; };
     nixpkgs-2105 = { url = "github:NixOS/nixpkgs/nixpkgs-21.05-darwin"; };
     nixpkgs-2111 = { url = "github:NixOS/nixpkgs/nixpkgs-21.11-darwin"; };
+    nixpkgs-2205 = { url = "github:NixOS/nixpkgs/nixpkgs-22.05-darwin"; };
     nixpkgs-unstable = { url = "github:NixOS/nixpkgs/nixpkgs-unstable"; };
     flake-utils = { url = "github:numtide/flake-utils"; };
     hydra.url = "hydra";

flake.nix

@@ -76,9 +76,11 @@ let
 
     # Inputs needed to boot the GHCJS compiler
     bootInputs = with pkgs.buildPackages; [
-            # pin nodejs to the 12 series for now, as strings can only be half the length in node 14+
-            # see https://github.com/nodejs/node/issues/33960, this can break large TH splices for now.
-            nodejs-12_x
+            # We used to pin nodejs to the 12 series, as strings can only be half the length in node 14+
+            # see https://github.com/nodejs/node/issues/33960
+            # Large TH splices are likely broken.
+            # TODO reinstate the pin of find a work around for ghcjs to send TH splice in chunks.
+            nodejs-18_x
             makeWrapper
             xorg.lndir
             gmp

lib/ghcjs-project.nix

@@ -22,7 +22,7 @@ final: prev:
           set -euo pipefail
           exe=$1
           shift
-          ${final.buildPackages.nodejs-12_x}/bin/node $exe $@
+          ${final.buildPackages.nodejs-18_x}/bin/node $exe $@
         '') + "/bin/node-wrapper")];
 
         # Apply the patches that came with `ghcjs`

overlays/ghcjs.nix

@@ -1,7 +1,7 @@
 # 'supportedSystems' restricts the set of systems that we will evaluate for. Useful when you're evaluating
 # on a machine with e.g. no way to build the Darwin IFDs you need!
 { supportedSystems ? [ "x86_64-linux" "x86_64-darwin" ]
-, ifdLevel ? 3
+, ifdLevel ? 1
 , checkMaterialization ? false }:
 
 let