diff --git a/doc/release-notes/rl-2511.section.md b/doc/release-notes/rl-2511.section.md
index a1af41f0d054..25335f2f4232 100644
--- a/doc/release-notes/rl-2511.section.md
+++ b/doc/release-notes/rl-2511.section.md
@@ -46,6 +46,8 @@
 
 - `conduwuit` was removed due to upstream ceasing development and deleting their repository. For existing data, a migration to `matrix-conduit`, `matrix-continuwuity` or `matrix-tuwunel` may be possible.
 
+- The GHCJS 8.10.7, exposed via `haskell.compiler.ghcjs` and `haskell.compiler.ghcjs810`, has been removed. Downstream users should migrate their projects to the new JavaScript backend of GHC proper which can be used via `pkgsCross.ghcjs` from Nixpkgs.
+
 - `gnome-keyring` no longer ships with an SSH agent anymore because it has been deprecated upstream. You should use `gcr_4` instead, which provides the same features. More information on why this was done can be found on [the relevant GCR upstream PR](https://gitlab.gnome.org/GNOME/gcr/-/merge_requests/67).
 
 - `stdenv.mkDerivation` and other derivation builders that use it no longer allow the value of `env` to be anything but an attribute set, for the purpose of setting environment variables that are available to the [builder](https://nix.dev/manual/nix/latest/store/derivation/#builder) process. An environment variable called `env` can still be provided by means of `mkDerivation { env.env = ...; }`, though we recommend to use a more specific name than "env".
diff --git a/pkgs/development/compilers/ghcjs/8.10/common-overrides.nix b/pkgs/development/compilers/ghcjs/8.10/common-overrides.nix
deleted file mode 100644
index 38caf51088e8..000000000000
--- a/pkgs/development/compilers/ghcjs/8.10/common-overrides.nix
+++ /dev/null
@@ -1,42 +0,0 @@
-{
-  haskellLib,
-  fetchpatch,
-  buildPackages,
-}:
-
-let
-  inherit (haskellLib)
-    addBuildTools
-    appendConfigureFlag
-    dontHaddock
-    doJailbreak
-    markUnbroken
-    overrideCabal
-    ;
-in
-self: super: {
-  ghcjs =
-    overrideCabal
-      (drv: {
-        # Jailbreak and patch can be dropped after https://github.com/ghcjs/ghcjs/pull/833
-        jailbreak = true;
-        patches = drv.patches or [ ] ++ [
-          (fetchpatch {
-            name = "ghcjs-aeson-2.0.patch";
-            url = "https://github.com/ghcjs/ghcjs/commit/9ef1f92d740e8503d15d91699f57db147f0474cc.patch";
-            sha256 = "0cgxcy6b5870bv4kj54n3bzcqinh4gl4w4r78dg43h2mblhkzbnj";
-          })
-        ];
-      })
-      (
-        super.ghcjs.overrideScope (
-          self: super: {
-            # Allow transformers-compat >= 0.7
-            optparse-applicative = doJailbreak self.optparse-applicative_0_15_1_0;
-            ansi-wl-pprint = self.ansi-wl-pprint_0_6_9;
-            ansi-terminal = self.ansi-terminal_1_0_2;
-            ansi-terminal-types = self.ansi-terminal-types_0_11_5;
-          }
-        )
-      );
-}
diff --git a/pkgs/development/compilers/ghcjs/8.10/configured-ghcjs-src.nix b/pkgs/development/compilers/ghcjs/8.10/configured-ghcjs-src.nix
deleted file mode 100644
index 3df3a42bf5c3..000000000000
--- a/pkgs/development/compilers/ghcjs/8.10/configured-ghcjs-src.nix
+++ /dev/null
@@ -1,70 +0,0 @@
-{
-  perl,
-  autoconf,
-  automake,
-  python3,
-  gcc,
-  cabal-install,
-  runCommand,
-  fetchpatch,
-
-  ghc,
-  happy,
-  alex,
-
-  ghcjsSrc,
-  version,
-}:
-
-runCommand "configured-ghcjs-src"
-  {
-    nativeBuildInputs = [
-      perl
-      autoconf
-      automake
-      python3
-      ghc
-      happy
-      alex
-      cabal-install
-      gcc
-    ];
-
-    inherit ghcjsSrc;
-
-    ctimePatch = fetchpatch {
-      name = "ghcjs-base-ctime-64-bit.patch";
-      url = "https://github.com/ghcjs/ghcjs/commit/b7711fbca7c3f43a61f1dba526e6f2a2656ef44c.patch";
-      hash = "sha256-zZ3l8/5gbIGtvu0s2Xl92fEDhkhJ2c2w+5Ql5qkvr3s=";
-    };
-  }
-  ''
-    export HOME=$(pwd)
-    mkdir $HOME/.cabal
-    touch $HOME/.cabal/config
-    cp -r "$ghcjsSrc" "$out"
-    chmod -R +w "$out"
-    cd "$out"
-
-    patch -p1 -i "$ctimePatch"
-
-    # TODO: Find a better way to avoid impure version numbers
-    sed -i 's/RELEASE=NO/RELEASE=YES/' ghc/configure.ac
-
-    # These files are needed by ghc-boot package, and these are generated by the
-    # make/hadrian build system when compiling ghc. Since we dont have access to
-    # the generated code of the ghc while it got built, here is a little hack to
-    # generate these again.
-    runhaskell ${./generate_host_version.hs}
-    mkdir -p utils/pkg-cache/ghc/libraries/ghc-boot/dist-install/build/GHC/Platform
-    mv Host.hs utils/pkg-cache/ghc/libraries/ghc-boot/dist-install/build/GHC/Platform/Host.hs
-    mv Version.hs utils/pkg-cache/ghc/libraries/ghc-boot/dist-install/build/GHC/Version.hs
-
-    # The ghcjs has the following hardcoded paths of lib dir in its code. Patching
-    # these to match the path expected by the nixpkgs's generic-builder, etc.
-    sed -i 's/libSubDir = "lib"/libSubDir = "lib\/ghcjs-${version}"/' src-bin/Boot.hs
-    sed -i 's@let libDir = takeDirectory haddockPath </> ".." </> "lib"@let libDir = takeDirectory haddockPath </> ".." </> "lib/ghcjs-${version}"@' src-bin/HaddockDriver.hs
-
-    patchShebangs .
-    ./utils/makePackages.sh copy
-  ''
diff --git a/pkgs/development/compilers/ghcjs/8.10/default.nix b/pkgs/development/compilers/ghcjs/8.10/default.nix
deleted file mode 100644
index a060e8e9d5c6..000000000000
--- a/pkgs/development/compilers/ghcjs/8.10/default.nix
+++ /dev/null
@@ -1,144 +0,0 @@
-{
-  stdenv,
-  pkgsHostHost,
-  callPackage,
-  fetchgit,
-  fetchpatch,
-  ghcjsSrcJson ? null,
-  ghcjsSrc ? fetchgit (lib.importJSON ghcjsSrcJson),
-  bootPkgs,
-  stage0,
-  haskellLib,
-  cabal-install,
-  nodejs,
-  makeWrapper,
-  xorg,
-  gmp,
-  pkg-config,
-  gcc,
-  lib,
-  ghcjsDepOverrides ? (_: _: { }),
-  linkFarm,
-  buildPackages,
-}:
-
-let
-  passthru = {
-    configuredSrc = callPackage ./configured-ghcjs-src.nix {
-      inherit ghcjsSrc;
-      inherit (bootPkgs) ghc alex;
-      inherit (bootGhcjs) version;
-      happy = bootPkgs.happy_1_19_12;
-    };
-    bootPkgs = bootPkgs.extend (
-      lib.foldr lib.composeExtensions (_: _: { }) [
-        (
-          self: _:
-          import stage0 {
-            inherit (passthru) configuredSrc;
-            inherit (self) callPackage;
-          }
-        )
-
-        (callPackage ./common-overrides.nix {
-          inherit haskellLib fetchpatch buildPackages;
-        })
-        ghcjsDepOverrides
-      ]
-    );
-
-    targetPrefix = "";
-    inherit bootGhcjs;
-    inherit (bootGhcjs) version;
-    isGhcjs = true;
-
-    llvmPackages = null;
-    enableShared = true;
-
-    socket-io = pkgsHostHost.nodePackages."socket.io";
-
-    haskellCompilerName = "ghcjs-${bootGhcjs.version}";
-  };
-
-  bootGhcjs = haskellLib.justStaticExecutables passthru.bootPkgs.ghcjs;
-
-  # This provides the stuff we need from the emsdk
-  emsdk = linkFarm "emsdk" [
-    {
-      name = "upstream/bin";
-      path = buildPackages.clang + "/bin";
-    }
-    {
-      name = "upstream/emscripten";
-      path = buildPackages.emscripten + "/bin";
-    }
-  ];
-
-in
-stdenv.mkDerivation {
-  name = bootGhcjs.name;
-  src = passthru.configuredSrc;
-  nativeBuildInputs = [
-    bootGhcjs
-    passthru.bootPkgs.ghc
-    cabal-install
-    nodejs
-    makeWrapper
-    xorg.lndir
-    gmp
-    pkg-config
-  ]
-  ++ lib.optionals stdenv.hostPlatform.isDarwin [
-    gcc # https://github.com/ghcjs/ghcjs/issues/663
-  ];
-  dontConfigure = true;
-  dontInstall = true;
-
-  # Newer versions of `config.sub` reject the `js-ghcjs` host string, but the
-  # older `config.sub` filed vendored within `ghc` still works
-  dontUpdateAutotoolsGnuConfigScripts = true;
-
-  buildPhase = ''
-    export HOME=$TMP
-    mkdir $HOME/.cabal
-    touch $HOME/.cabal/config
-    cd lib/boot
-
-    export EM_CACHE="$HOME/.emscriptencache"
-    mkdir -p "$EM_CACHE"
-
-    mkdir -p $out/bin
-    mkdir -p $out/lib/${bootGhcjs.name}
-    lndir ${bootGhcjs}/bin $out/bin
-    chmod -R +w $out/bin
-    rm $out/bin/ghcjs-boot
-    cp ${bootGhcjs}/bin/ghcjs-boot $out/bin
-    rm $out/bin/haddock
-    cp ${bootGhcjs}/bin/haddock $out/bin
-    cp ${bootGhcjs}/bin/private-ghcjs-hsc2hs $out/bin/ghcjs-hsc2hs
-
-    wrapProgram $out/bin/ghcjs-boot --set ghcjs_libexecdir $out/bin
-
-    wrapProgram $out/bin/ghcjs --add-flags "-B$out/lib/${bootGhcjs.name}"
-    wrapProgram $out/bin/haddock --add-flags "-B$out/lib/${bootGhcjs.name}"
-    wrapProgram $out/bin/ghcjs-pkg --add-flags "--global-package-db=$out/lib/${bootGhcjs.name}/package.conf.d"
-    wrapProgram $out/bin/ghcjs-hsc2hs --add-flags "-I$out/lib/${bootGhcjs.name}/include --template=$out/lib/${bootGhcjs.name}/include/template-hsc.h"
-
-    env PATH=$out/bin:$PATH $out/bin/ghcjs-boot --with-emsdk=${emsdk} --no-haddock
-  '';
-
-  enableParallelBuilding = true;
-
-  inherit passthru;
-
-  meta = {
-    platforms = with lib.platforms; linux ++ darwin;
-
-    # Hydra limits jobs to only outputting 1 gigabyte worth of files.
-    # GHCJS outputs over 3 gigabytes.
-    # https://github.com/NixOS/nixpkgs/pull/137066#issuecomment-922335563
-    hydraPlatforms = lib.platforms.none;
-
-    maintainers = with lib.maintainers; [ obsidian-systems-maintenance ];
-  };
-}
diff --git a/pkgs/development/compilers/ghcjs/8.10/generate_host_version.hs b/pkgs/development/compilers/ghcjs/8.10/generate_host_version.hs
deleted file mode 100644
index 8bf2583d238c..000000000000
--- a/pkgs/development/compilers/ghcjs/8.10/generate_host_version.hs
+++ /dev/null
@@ -1,54 +0,0 @@
--- Generate the Host.hs and Version.hs as done by hadrian/src/Rules/Generate.hs
-
-import GHC.Platform.Host
-import GHC.Version
-
-main = do
-  writeFile "Version.hs" versionHs
-  writeFile "Host.hs" platformHostHs
-
--- | Generate @Version.hs@ files.
-versionHs :: String
-versionHs = unlines
-        [ "module GHC.Version where"
-        , ""
-        , "import Prelude -- See Note [Why do we import Prelude here?]"
-        , ""
-        , "cProjectGitCommitId   :: String"
-        , "cProjectGitCommitId   = " ++ show cProjectGitCommitId
-        , ""
-        , "cProjectVersion       :: String"
-        , "cProjectVersion       = " ++ show cProjectVersion
-        , ""
-        , "cProjectVersionInt    :: String"
-        , "cProjectVersionInt    = " ++ show cProjectVersionInt
-        , ""
-        , "cProjectPatchLevel    :: String"
-        , "cProjectPatchLevel    = " ++ show cProjectPatchLevel
-        , ""
-        , "cProjectPatchLevel1   :: String"
-        , "cProjectPatchLevel1   = " ++ show cProjectPatchLevel1
-        , ""
-        , "cProjectPatchLevel2   :: String"
-        , "cProjectPatchLevel2   = " ++ show cProjectPatchLevel2
-        ]
-
--- | Generate @Platform/Host.hs@ files.
-platformHostHs :: String
-platformHostHs = unlines
-        [ "module GHC.Platform.Host where"
-        , ""
-        , "import GHC.Platform"
-        , ""
-        , "cHostPlatformArch :: Arch"
-        , "cHostPlatformArch = " ++ show cHostPlatformArch
-        , ""
-        , "cHostPlatformOS   :: OS"
-        , "cHostPlatformOS   = " ++ show cHostPlatformOS
-        , ""
-        , "cHostPlatformMini :: PlatformMini"
-        , "cHostPlatformMini = PlatformMini"
-        , "  { platformMini_arch = cHostPlatformArch"
-        , "  , platformMini_os = cHostPlatformOS"
-        , "  }"
-        ]
diff --git a/pkgs/development/compilers/ghcjs/8.10/git.json b/pkgs/development/compilers/ghcjs/8.10/git.json
deleted file mode 100644
index 18804d84acb1..000000000000
--- a/pkgs/development/compilers/ghcjs/8.10/git.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "url": "https://github.com/obsidiansystems/ghcjs",
-  "rev": "9fc935f2c3ba6c33ec62eb83afc9f52a893eb68c",
-  "sha256": "sha256:063dmir39c4i1z8ypnmq86g1x2vhqndmdpzc4hyzsy5jjqcbx6i3",
-  "fetchSubmodules": true
-}
diff --git a/pkgs/development/compilers/ghcjs/8.10/stage0.nix b/pkgs/development/compilers/ghcjs/8.10/stage0.nix
deleted file mode 100644
index 30c89a1b2e19..000000000000
--- a/pkgs/development/compilers/ghcjs/8.10/stage0.nix
+++ /dev/null
@@ -1,245 +0,0 @@
-{ callPackage, configuredSrc }:
-
-{
-
-  ghcjs = callPackage (
-    {
-      mkDerivation,
-      aeson,
-      alex,
-      array,
-      attoparsec,
-      base,
-      base16-bytestring,
-      base64-bytestring,
-      binary,
-      bytestring,
-      Cabal,
-      containers,
-      cryptohash,
-      data-default,
-      deepseq,
-      directory,
-      executable-path,
-      filepath,
-      ghc-boot,
-      ghc-boot-th,
-      ghc-compact,
-      ghc-heap,
-      ghc-paths,
-      ghci,
-      happy,
-      hashable,
-      hpc,
-      http-types,
-      HUnit,
-      lens,
-      lib,
-      lifted-base,
-      mtl,
-      network,
-      optparse-applicative,
-      parallel,
-      parsec,
-      process,
-      random,
-      safe,
-      shelly,
-      split,
-      stringsearch,
-      syb,
-      tar,
-      template-haskell,
-      terminfo,
-      test-framework,
-      test-framework-hunit,
-      text,
-      time,
-      transformers,
-      unix,
-      unix-compat,
-      unordered-containers,
-      vector,
-      wai,
-      wai-app-static,
-      wai-extra,
-      wai-websockets,
-      warp,
-      webdriver,
-      websockets,
-      wl-pprint-text,
-      xhtml,
-      yaml,
-    }:
-    mkDerivation {
-      pname = "ghcjs";
-      version = "8.10.7";
-      src = configuredSrc + /.;
-      isLibrary = true;
-      isExecutable = true;
-      libraryHaskellDepends = [
-        aeson
-        array
-        attoparsec
-        base
-        base16-bytestring
-        base64-bytestring
-        binary
-        bytestring
-        Cabal
-        containers
-        cryptohash
-        data-default
-        deepseq
-        directory
-        filepath
-        ghc-boot
-        ghc-boot-th
-        ghc-compact
-        ghc-heap
-        ghc-paths
-        ghci
-        hashable
-        hpc
-        lens
-        mtl
-        optparse-applicative
-        parallel
-        parsec
-        process
-        safe
-        split
-        stringsearch
-        syb
-        template-haskell
-        terminfo
-        text
-        time
-        transformers
-        unix
-        unordered-containers
-        vector
-        wl-pprint-text
-        yaml
-      ];
-      libraryToolDepends = [
-        alex
-        happy
-      ];
-      executableHaskellDepends = [
-        aeson
-        array
-        base
-        binary
-        bytestring
-        Cabal
-        containers
-        deepseq
-        directory
-        executable-path
-        filepath
-        ghc-boot
-        lens
-        mtl
-        optparse-applicative
-        parsec
-        process
-        tar
-        terminfo
-        text
-        time
-        transformers
-        unix
-        unix-compat
-        unordered-containers
-        vector
-        xhtml
-        yaml
-      ];
-      testHaskellDepends = [
-        aeson
-        base
-        bytestring
-        data-default
-        deepseq
-        directory
-        filepath
-        http-types
-        HUnit
-        lens
-        lifted-base
-        network
-        optparse-applicative
-        process
-        random
-        shelly
-        test-framework
-        test-framework-hunit
-        text
-        time
-        transformers
-        unordered-containers
-        wai
-        wai-app-static
-        wai-extra
-        wai-websockets
-        warp
-        webdriver
-        websockets
-        yaml
-      ];
-      description = "Haskell to JavaScript compiler";
-      license = lib.licenses.mit;
-    }
-  ) { };
-
-  ghcjs-th = callPackage (
-    {
-      mkDerivation,
-      base,
-      binary,
-      bytestring,
-      containers,
-      ghc-prim,
-      ghci,
-      lib,
-      template-haskell,
-    }:
-    mkDerivation {
-      pname = "ghcjs-th";
-      version = "0.1.0.0";
-      src = configuredSrc + /lib/ghcjs-th;
-      libraryHaskellDepends = [
-        base
-        binary
-        bytestring
-        containers
-        ghc-prim
-        ghci
-        template-haskell
-      ];
-      homepage = "https://github.com/ghcjs";
-      license = lib.licenses.mit;
-    }
-  ) { };
-
-  ghcjs-prim = callPackage (
-    {
-      mkDerivation,
-      base,
-      ghc-prim,
-      lib,
-    }:
-    mkDerivation {
-      pname = "ghcjs-prim";
-      version = "0.1.1.0";
-      src = ./.;
-      libraryHaskellDepends = [
-        base
-        ghc-prim
-      ];
-      homepage = "https://github.com/ghcjs";
-      license = lib.licenses.mit;
-    }
-  ) { };
-}
diff --git a/pkgs/development/compilers/ghcjs/ghcjs-base.nix b/pkgs/development/compilers/ghcjs/ghcjs-base.nix
deleted file mode 100644
index bb57c0beefca..000000000000
--- a/pkgs/development/compilers/ghcjs/ghcjs-base.nix
+++ /dev/null
@@ -1,87 +0,0 @@
-{
-  mkDerivation,
-  aeson,
-  array,
-  attoparsec,
-  base,
-  binary,
-  bytestring,
-  containers,
-  deepseq,
-  directory,
-  dlist,
-  fetchFromGitHub,
-  ghc-prim,
-  ghcjs-prim,
-  hashable,
-  HUnit,
-  integer-gmp,
-  primitive,
-  QuickCheck,
-  quickcheck-unicode,
-  random,
-  scientific,
-  test-framework,
-  test-framework-hunit,
-  test-framework-quickcheck2,
-  text,
-  time,
-  transformers,
-  unordered-containers,
-  vector,
-  lib,
-}:
-mkDerivation {
-  pname = "ghcjs-base";
-  version = "0.2.1.0";
-  # This is the release 0.2.1.0, but the hackage release misses test source files,
-  # so lets use github https://github.com/ghcjs/ghcjs-base/issues/132
-  src = fetchFromGitHub {
-    owner = "ghcjs";
-    repo = "ghcjs-base";
-    rev = "fbaae59b05b020e91783df122249095e168df53f";
-    sha256 = "sha256-x6eCAK1Hne0QkV3Loi9YpxbleNHU593E4AO8cbk2vUc=";
-  };
-  libraryHaskellDepends = [
-    aeson
-    attoparsec
-    base
-    binary
-    bytestring
-    containers
-    deepseq
-    dlist
-    ghc-prim
-    ghcjs-prim
-    hashable
-    integer-gmp
-    primitive
-    scientific
-    text
-    time
-    transformers
-    unordered-containers
-    vector
-  ];
-  testHaskellDepends = [
-    array
-    base
-    bytestring
-    deepseq
-    directory
-    ghc-prim
-    ghcjs-prim
-    HUnit
-    primitive
-    QuickCheck
-    quickcheck-unicode
-    random
-    test-framework
-    test-framework-hunit
-    test-framework-quickcheck2
-    text
-  ];
-  homepage = "https://github.com/ghcjs/ghcjs-base";
-  description = "base library for GHCJS";
-  license = lib.licenses.mit;
-}
diff --git a/pkgs/development/haskell-modules/configuration-arm.nix b/pkgs/development/haskell-modules/configuration-arm.nix
index 9b12e09880b8..6e3fb04d8ec1 100644
--- a/pkgs/development/haskell-modules/configuration-arm.nix
+++ b/pkgs/development/haskell-modules/configuration-arm.nix
@@ -37,7 +37,6 @@ self: super:
 
   # Similar to https://ghc.haskell.org/trac/ghc/ticket/13062
   happy = dontCheck super.happy;
-  happy_1_19_12 = doDistribute (dontCheck super.happy_1_19_12);
 
   # add arm specific library
   wiringPi = overrideCabal (
diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 35172aa12edd..87e0ba9d7008 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1831,16 +1831,6 @@ with haskellLib;
   # https://github.com/biocad/servant-openapi3/issues/30
   servant-openapi3 = dontCheck super.servant-openapi3;
 
-  # Point hspec 2.7.10 to correct dependencies
-  hspec_2_7_10 = super.hspec_2_7_10.override {
-    hspec-discover = self.hspec-discover_2_7_10;
-    hspec-core = self.hspec-core_2_7_10;
-  };
-  hspec-discover_2_7_10 = super.hspec-discover_2_7_10.override {
-    hspec-meta = self.hspec-meta_2_7_8;
-  };
-  hspec-core_2_7_10 = doJailbreak (dontCheck super.hspec-core_2_7_10);
-
   # Disable test cases that were broken by insignificant changes in icu 76
   # https://github.com/haskell/text-icu/issues/108
   text-icu = overrideCabal (drv: {
diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
index 38f53d3e04c9..f39c3ce90488 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
@@ -8,10 +8,7 @@ let
 in
 
 self: super: {
-
-  # ghcjs does not use `llvmPackages` and exposes `null` attribute.
-  llvmPackages =
-    if self.ghc.llvmPackages != null then pkgs.lib.dontRecurseIntoAttrs self.ghc.llvmPackages else null;
+  llvmPackages = pkgs.lib.dontRecurseIntoAttrs self.ghc.llvmPackages;
 
   # Disable GHC 8.10.x core libraries.
   array = null;
diff --git a/pkgs/development/haskell-modules/configuration-ghcjs-8.x.nix b/pkgs/development/haskell-modules/configuration-ghcjs-8.x.nix
deleted file mode 100644
index 56776f094cb9..000000000000
--- a/pkgs/development/haskell-modules/configuration-ghcjs-8.x.nix
+++ /dev/null
@@ -1,154 +0,0 @@
-# GHCJS package fixes
-#
-# Please insert new packages *alphabetically*
-# in the OTHER PACKAGES section.
-{ pkgs, haskellLib }:
-
-let
-  removeLibraryHaskellDepends =
-    pnames: depends: builtins.filter (e: !(builtins.elem (e.pname or "") pnames)) depends;
-in
-
-with haskellLib;
-
-self: super:
-
-## GENERAL SETUP BASE PACKAGES
-{
-  inherit (self.ghc.bootPkgs)
-    jailbreak-cabal
-    alex
-    happy
-    gtk2hs-buildtools
-    rehoo
-    hoogle
-    ;
-
-  # Test suite fails; https://github.com/ghcjs/ghcjs-base/issues/133
-  ghcjs-base = dontCheck (
-    self.callPackage ../compilers/ghcjs/ghcjs-base.nix {
-      fetchFromGitHub = pkgs.buildPackages.fetchFromGitHub;
-      aeson = self.aeson_1_5_6_0;
-    }
-  );
-
-  # Included in ghcjs itself
-  ghcjs-prim = null;
-
-  ghcjs-websockets = markUnbroken super.ghcjs-websockets;
-
-  # GHCJS does not ship with the same core packages as GHC.
-  # https://github.com/ghcjs/ghcjs/issues/676
-  stm = doJailbreak self.stm_2_5_3_1;
-  exceptions = dontCheck self.exceptions_0_10_10;
-
-  ## OTHER PACKAGES
-
-  # Runtime exception in tests, missing C API h$realloc
-  base-compat-batteries = dontCheck super.base-compat-batteries;
-
-  # nodejs crashes during test
-  ChasingBottoms = dontCheck super.ChasingBottoms;
-
-  # runs forever
-  text-short = dontCheck super.text-short;
-
-  # doctest doesn't work on ghcjs, but sometimes dontCheck doesn't seem to get rid of the dependency
-  doctest = pkgs.lib.warn "ignoring dependency on doctest" null;
-
-  ghcjs-dom = overrideCabal (drv: {
-    libraryHaskellDepends = with self; [
-      ghcjs-base
-      ghcjs-dom-jsffi
-      text
-      transformers
-    ];
-    configureFlags = [
-      "-fjsffi"
-      "-f-webkit"
-    ];
-  }) super.ghcjs-dom;
-
-  ghcjs-dom-jsffi = overrideCabal (drv: {
-    libraryHaskellDepends = (drv.libraryHaskellDepends or [ ]) ++ [
-      self.ghcjs-base
-      self.text
-    ];
-    broken = false;
-  }) super.ghcjs-dom-jsffi;
-
-  # https://github.com/Deewiant/glob/issues/39
-  Glob = dontCheck super.Glob;
-
-  # Test fails to compile during the hsc2hs stage
-  hashable = dontCheck super.hashable;
-
-  # uses doctest
-  http-types = dontCheck super.http-types;
-
-  jsaddle = overrideCabal (drv: {
-    libraryHaskellDepends = (drv.libraryHaskellDepends or [ ]) ++ [ self.ghcjs-base ];
-  }) super.jsaddle;
-
-  # Tests hang, possibly some issue with tasty and race(async) usage in the nonTerminating tests
-  logict = dontCheck super.logict;
-
-  patch = dontCheck super.patch;
-
-  # TODO: tests hang
-  pcre-light = dontCheck super.pcre-light;
-
-  # Terminal test not supported on ghcjs
-  QuickCheck = dontCheck super.QuickCheck;
-
-  reflex = overrideCabal (drv: {
-    libraryHaskellDepends = (drv.libraryHaskellDepends or [ ]) ++ [ self.ghcjs-base ];
-  }) super.reflex;
-
-  reflex-dom = overrideCabal (drv: {
-    libraryHaskellDepends = removeLibraryHaskellDepends [ "jsaddle-webkit2gtk" ] (
-      drv.libraryHaskellDepends or [ ]
-    );
-  }) super.reflex-dom;
-
-  # https://github.com/dreixel/syb/issues/21
-  syb = dontCheck super.syb;
-
-  # nodejs crashes during test
-  scientific = dontCheck super.scientific;
-
-  # Tests use TH which gives error
-  tasty-quickcheck = dontCheck super.tasty-quickcheck;
-
-  temporary = dontCheck super.temporary;
-
-  # TODO: The tests have a TH error, which has been fixed in ghc
-  # https://gitlab.haskell.org/ghc/ghc/-/issues/15481 but somehow the issue is
-  # still present here https://github.com/glguy/th-abstraction/issues/53
-  th-abstraction = dontCheck super.th-abstraction;
-
-  # Need hedgehog for tests, which fails to compile due to dep on concurrent-output
-  zenc = dontCheck super.zenc;
-
-  hspec = self.hspec_2_7_10;
-  hspec-core = self.hspec-core_2_7_10;
-  hspec-meta = self.hspec-meta_2_7_8;
-  hspec-discover = self.hspec-discover_2_7_10;
-
-  # ReferenceError: h$primop_ShrinkSmallMutableArrayOp_Char is not defined
-  unordered-containers = dontCheck super.unordered-containers;
-
-  # Without this revert, test suites using tasty fail with:
-  # ReferenceError: h$getMonotonicNSec is not defined
-  # https://github.com/UnkindPartition/tasty/pull/345#issuecomment-1538216407
-  tasty = appendPatch (pkgs.fetchpatch {
-    name = "tasty-ghcjs.patch";
-    url = "https://github.com/UnkindPartition/tasty/commit/e692065642fd09b82acccea610ad8f49edd207df.patch";
-    revert = true;
-    relative = "core";
-    hash = "sha256-ryABU2ywkVOEPC/jWv8humT3HaRpCwMYEk+Ux3hhi/M=";
-  }) super.tasty;
-
-  # Tests take unacceptably long.
-  vector = dontCheck super.vector;
-}
diff --git a/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml b/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
index f65507959f90..460a905c9bec 100644
--- a/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
+++ b/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
@@ -45,12 +45,8 @@ default-package-overrides:
 
 # keep-sorted start skip_lines=1 case=no numeric=yes
 extra-packages:
-  - aeson < 2                           # required by pantry-0.5.2
   - algebraic-graphs < 0.7              # 2023-08-14: Needed for building weeder < 2.6.0
-  - ansi-terminal < 1.1                 # 2025-02-27: required for ghcjs
-  - ansi-terminal-types == 0.11.5       # 2025-02-27: required for ghcjs
-  - ansi-wl-pprint >= 0.6 && < 0.7      # 2024-03-23: required for ghcjs
-  - apply-refact == 0.9.*               # 2022-12-12: needed for GHC < 9.2
+  - ansi-wl-pprint >= 0.6 && < 0.7      # 2025-07-07: used by gren <= 0.5.4
   - attoparsec == 0.13.*                # 2022-02-23: Needed to compile elm for now
   - Cabal == 3.2.*                      # Used for packages needing newer Cabal on ghc 8.6 and 8.8
   - Cabal == 3.10.*
@@ -85,7 +81,6 @@ extra-packages:
   - ghc-tags == 1.5.*                   # 2023-02-18: preserve for ghc-lib == 9.2.*
   - ghc-tags == 1.7.*                   # 2023-02-18: preserve for ghc-lib == 9.6.*
   - ghc-tags == 1.8.*                   # 2023-02-18: preserve for ghc-lib == 9.8.*
-  - happy == 1.19.12                    # for ghcjs
   - happy == 1.20.*                     # for ghc-lib-parser == 9.6.*
   - hasql < 1.7                         # 2025-01-19: Needed for building postgrest
   - hasql-dynamic-statements < 0.3.1.6  # 2025-01-19: Needed for building postgrest
@@ -96,17 +91,12 @@ extra-packages:
   - hlint == 3.4.1                      # 2022-09-21: preserve for ghc 8.10
   - hlint == 3.6.*                      # 2025-04-14: needed for hls with ghc-lib-parser 9.6
   - hnix-store-core < 0.7               # 2023-12-11: required by hnix-store-remote 0.6
-  - hspec < 2.8                         # 2022-04-07: Needed for tasty-hspec 1.1.6
-  - hspec-core < 2.8                    # 2022-04-07: Needed for tasty-hspec 1.1.6
-  - hspec-discover < 2.8                # 2022-04-07: Needed for tasty-hspec 1.1.6
   - hspec-megaparsec == 2.2.0           # 2023-11-18: Latest version compatible with ghc 9.0
-  - hspec-meta < 2.8                    # 2022-12-07: Needed for elmPackages.elm / hspec-discover
   - language-javascript == 0.7.0.0      # required by purescript
   - lsp < 2.5                           # 2024-07-08: need for koka
   - lsp == 2.1.*                        # 2024-02-28: need for dhall-lsp-server
   - lsp-types == 2.1.*                  # 2024-02-28: need for dhall-lsp-server and koka
   - network-run == 0.4.0                # 2024-10-20: for GHC 9.10/network == 3.1.*
-  - optparse-applicative < 0.16         # needed for niv-0.2.19
   - ormolu == 0.5.2.0                   # 2023-08-08: preserve for ghc 9.0
   - ormolu == 0.7.2.0                   # 2023-11-13: for ghc-lib-parser 9.6 compat
   - ormolu == 0.7.7.0                   # 2025-01-27: for ghc 9.10 compat
diff --git a/pkgs/development/haskell-modules/configuration-nix.nix b/pkgs/development/haskell-modules/configuration-nix.nix
index 263457fb312b..73ed3fb95351 100644
--- a/pkgs/development/haskell-modules/configuration-nix.nix
+++ b/pkgs/development/haskell-modules/configuration-nix.nix
@@ -635,15 +635,9 @@ builtins.intersectAttrs super {
   tasty = overrideCabal (drv: {
     libraryHaskellDepends =
       (drv.libraryHaskellDepends or [ ])
-      ++
-        lib.optionals
-          (
-            !(pkgs.stdenv.hostPlatform.isAarch64 || pkgs.stdenv.hostPlatform.isx86_64)
-            || (self.ghc.isGhcjs or false)
-          )
-          [
-            self.unbounded-delays
-          ];
+      ++ lib.optionals (!(pkgs.stdenv.hostPlatform.isAarch64 || pkgs.stdenv.hostPlatform.isx86_64)) [
+        self.unbounded-delays
+      ];
   }) super.tasty;
 
   tasty-discover = overrideCabal (drv: {
diff --git a/pkgs/development/haskell-modules/hackage-packages.nix b/pkgs/development/haskell-modules/hackage-packages.nix
index 0257dfb1bcb3..cf1425692db5 100644
--- a/pkgs/development/haskell-modules/hackage-packages.nix
+++ b/pkgs/development/haskell-modules/hackage-packages.nix
@@ -53573,121 +53573,6 @@ self: {
     }
   ) { };
 
-  "aeson_1_5_6_0" = callPackage (
-    {
-      mkDerivation,
-      attoparsec,
-      base,
-      base-compat,
-      base-compat-batteries,
-      base-orphans,
-      base16-bytestring,
-      bytestring,
-      containers,
-      data-fix,
-      deepseq,
-      Diff,
-      directory,
-      dlist,
-      filepath,
-      generic-deriving,
-      ghc-prim,
-      hashable,
-      hashable-time,
-      integer-logarithms,
-      primitive,
-      QuickCheck,
-      quickcheck-instances,
-      scientific,
-      strict,
-      tagged,
-      tasty,
-      tasty-golden,
-      tasty-hunit,
-      tasty-quickcheck,
-      template-haskell,
-      text,
-      th-abstraction,
-      these,
-      time,
-      time-compat,
-      unordered-containers,
-      uuid-types,
-      vector,
-    }:
-    mkDerivation {
-      pname = "aeson";
-      version = "1.5.6.0";
-      sha256 = "1s5z4bgb5150h6a4cjf5vh8dmyrn6ilh29gh05999v6jwd5w6q83";
-      revision = "7";
-      editedCabalFile = "1qbsyy605hlfh7wfj3q33yx0xmb4n81z6h0y99x7khyxmy0plqbf";
-      libraryHaskellDepends = [
-        attoparsec
-        base
-        base-compat-batteries
-        bytestring
-        containers
-        data-fix
-        deepseq
-        dlist
-        ghc-prim
-        hashable
-        primitive
-        scientific
-        strict
-        tagged
-        template-haskell
-        text
-        th-abstraction
-        these
-        time
-        time-compat
-        unordered-containers
-        uuid-types
-        vector
-      ];
-      testHaskellDepends = [
-        attoparsec
-        base
-        base-compat
-        base-orphans
-        base16-bytestring
-        bytestring
-        containers
-        data-fix
-        Diff
-        directory
-        dlist
-        filepath
-        generic-deriving
-        ghc-prim
-        hashable
-        hashable-time
-        integer-logarithms
-        QuickCheck
-        quickcheck-instances
-        scientific
-        strict
-        tagged
-        tasty
-        tasty-golden
-        tasty-hunit
-        tasty-quickcheck
-        template-haskell
-        text
-        these
-        time
-        time-compat
-        unordered-containers
-        uuid-types
-        vector
-      ];
-      description = "Fast JSON parsing and encoding";
-      license = lib.licenses.bsd3;
-      hydraPlatforms = lib.platforms.none;
-    }
-  ) { };
-
   "aeson" = callPackage (
     {
       mkDerivation,
@@ -76649,30 +76534,6 @@ self: {
     }
   ) { };
 
-  "ansi-terminal_1_0_2" = callPackage (
-    {
-      mkDerivation,
-      ansi-terminal-types,
-      base,
-      colour,
-    }:
-    mkDerivation {
-      pname = "ansi-terminal";
-      version = "1.0.2";
-      sha256 = "0d6qm3ph6drim7g81yx46nmgspxsf4nnr2d91fa0fy3cyv5idra6";
-      isLibrary = true;
-      isExecutable = true;
-      libraryHaskellDepends = [
-        ansi-terminal-types
-        base
-        colour
-      ];
-      description = "Simple ANSI terminal support";
-      license = lib.licenses.bsd3;
-      hydraPlatforms = lib.platforms.none;
-    }
-  ) { };
-
   "ansi-terminal" = callPackage (
     {
       mkDerivation,
@@ -76778,28 +76639,6 @@ self: {
     }
   ) { };
 
-  "ansi-terminal-types_0_11_5" = callPackage (
-    {
-      mkDerivation,
-      base,
-      colour,
-    }:
-    mkDerivation {
-      pname = "ansi-terminal-types";
-      version = "0.11.5";
-      sha256 = "1lgxnhnzgk4mwlnh8zdgx8w8pa4q4n140mvd1880acgli41j6yxz";
-      revision = "1";
-      editedCabalFile = "02mhl78kmjfa0h22khcjdaaxyvanv717rb2mi3l0jiawv7gl117p";
-      libraryHaskellDepends = [
-        base
-        colour
-      ];
-      description = "Types and functions used to represent SGR aspects";
-      license = lib.licenses.bsd3;
-      hydraPlatforms = lib.platforms.none;
-    }
-  ) { };
-
   "ansi-terminal-types" = callPackage (
     {
       mkDerivation,
@@ -80800,101 +80639,6 @@ self: {
     }
   ) { };
 
-  "apply-refact_0_9_3_0" = callPackage (
-    {
-      mkDerivation,
-      base,
-      containers,
-      directory,
-      extra,
-      filemanip,
-      filepath,
-      ghc,
-      ghc-boot-th,
-      ghc-exactprint,
-      optparse-applicative,
-      process,
-      refact,
-      silently,
-      syb,
-      tasty,
-      tasty-expected-failure,
-      tasty-golden,
-      transformers,
-      uniplate,
-      unix-compat,
-    }:
-    mkDerivation {
-      pname = "apply-refact";
-      version = "0.9.3.0";
-      sha256 = "1sn5g71sx8xa4ggyk49m661iip6zrzl65vb87l16l31kf79bbm7w";
-      revision = "1";
-      editedCabalFile = "0hgdjm6ydfc29d922h1cpwrch61r5qchzrw21dz80kdry53qxl5q";
-      isLibrary = true;
-      isExecutable = true;
-      libraryHaskellDepends = [
-        base
-        containers
-        directory
-        extra
-        filemanip
-        ghc
-        ghc-boot-th
-        ghc-exactprint
-        process
-        refact
-        syb
-        transformers
-        uniplate
-        unix-compat
-      ];
-      executableHaskellDepends = [
-        base
-        containers
-        directory
-        extra
-        filemanip
-        filepath
-        ghc
-        ghc-boot-th
-        ghc-exactprint
-        optparse-applicative
-        process
-        refact
-        syb
-        transformers
-        uniplate
-        unix-compat
-      ];
-      testHaskellDepends = [
-        base
-        containers
-        directory
-        extra
-        filemanip
-        filepath
-        ghc
-        ghc-boot-th
-        ghc-exactprint
-        optparse-applicative
-        process
-        refact
-        silently
-        syb
-        tasty
-        tasty-expected-failure
-        tasty-golden
-        transformers
-        uniplate
-        unix-compat
-      ];
-      description = "Perform refactorings specified by the refact library";
-      license = lib.licenses.bsd3;
-      hydraPlatforms = lib.platforms.none;
-      mainProgram = "refactor";
-    }
-  ) { };
-
   "apply-refact" = callPackage (
     {
       mkDerivation,
@@ -297969,41 +297713,6 @@ self: {
     }
   ) { };
 
-  "happy_1_19_12" = callPackage (
-    {
-      mkDerivation,
-      array,
-      base,
-      containers,
-      mtl,
-      process,
-    }:
-    mkDerivation {
-      pname = "happy";
-      version = "1.19.12";
-      sha256 = "03xlmq6qmdx4zvzw8bp33kd9g7yvcq5cz4wg50xilw812kj276pv";
-      revision = "1";
-      editedCabalFile = "13wydw1mmdry4l9r63vxjk4h55ci9hgwzn1a842qqk1m2rb4xiln";
-      isLibrary = false;
-      isExecutable = true;
-      enableSeparateDataOutput = true;
-      executableHaskellDepends = [
-        array
-        base
-        containers
-        mtl
-      ];
-      testHaskellDepends = [
-        base
-        process
-      ];
-      description = "Happy is a parser generator for Haskell";
-      license = lib.licenses.bsd2;
-      hydraPlatforms = lib.platforms.none;
-      mainProgram = "happy";
-    }
-  ) { };
-
   "happy_1_20_1_1" = callPackage (
     {
       mkDerivation,
@@ -355226,32 +354935,6 @@ self: {
     }
   ) { };
 
-  "hspec_2_7_10" = callPackage (
-    {
-      mkDerivation,
-      base,
-      hspec-core,
-      hspec-discover,
-      hspec-expectations,
-      QuickCheck,
-    }:
-    mkDerivation {
-      pname = "hspec";
-      version = "2.7.10";
-      sha256 = "0z0lwrmrqkglr78n6k2c36n4h68142bh785ys0x4jaibjshvs6rw";
-      libraryHaskellDepends = [
-        base
-        hspec-core
-        hspec-discover
-        hspec-expectations
-        QuickCheck
-      ];
-      description = "A Testing Framework for Haskell";
-      license = lib.licenses.mit;
-      hydraPlatforms = lib.platforms.none;
-    }
-  ) { };
-
   "hspec" = callPackage (
     {
       mkDerivation,
@@ -355448,90 +355131,6 @@ self: {
     }
   ) { };
 
-  "hspec-core_2_7_10" = callPackage (
-    {
-      mkDerivation,
-      ansi-terminal,
-      array,
-      base,
-      call-stack,
-      clock,
-      deepseq,
-      directory,
-      filepath,
-      hspec-expectations,
-      hspec-meta,
-      HUnit,
-      process,
-      QuickCheck,
-      quickcheck-io,
-      random,
-      setenv,
-      silently,
-      stm,
-      temporary,
-      tf-random,
-      transformers,
-    }:
-    mkDerivation {
-      pname = "hspec-core";
-      version = "2.7.10";
-      sha256 = "12k9yp5gznrda449ir60d5wv3xl7nnyffkb5mhfc0svw9f8lxlv1";
-      revision = "2";
-      editedCabalFile = "0l16mgxgapnihrvbwvhbz9i60v5fx68mhpv6zww9b68bdj6cpbsk";
-      libraryHaskellDepends = [
-        ansi-terminal
-        array
-        base
-        call-stack
-        clock
-        deepseq
-        directory
-        filepath
-        hspec-expectations
-        HUnit
-        QuickCheck
-        quickcheck-io
-        random
-        setenv
-        stm
-        tf-random
-        transformers
-      ];
-      testHaskellDepends = [
-        ansi-terminal
-        array
-        base
-        call-stack
-        clock
-        deepseq
-        directory
-        filepath
-        hspec-expectations
-        hspec-meta
-        HUnit
-        process
-        QuickCheck
-        quickcheck-io
-        random
-        setenv
-        silently
-        stm
-        temporary
-        tf-random
-        transformers
-      ];
-      testToolDepends = [ hspec-meta ];
-      testFlags = [
-        "--skip"
-        "'Test.Hspec.Core.Runner.hspecResult runs specs in parallel'"
-      ];
-      description = "A Testing Framework for Haskell";
-      license = lib.licenses.mit;
-      hydraPlatforms = lib.platforms.none;
-    }
-  ) { };
-
   "hspec-core" = callPackage (
     {
       mkDerivation,
@@ -355662,47 +355261,6 @@ self: {
     }
   ) { };
 
-  "hspec-discover_2_7_10" = callPackage (
-    {
-      mkDerivation,
-      base,
-      directory,
-      filepath,
-      hspec-meta,
-      QuickCheck,
-    }:
-    mkDerivation {
-      pname = "hspec-discover";
-      version = "2.7.10";
-      sha256 = "13yzvd3b679skvs1insk4s0wc4zvmz6hs38kc8q0j6vzqq06smqa";
-      isLibrary = true;
-      isExecutable = true;
-      libraryHaskellDepends = [
-        base
-        directory
-        filepath
-      ];
-      executableHaskellDepends = [
-        base
-        directory
-        filepath
-      ];
-      testHaskellDepends = [
-        base
-        directory
-        filepath
-        hspec-meta
-        QuickCheck
-      ];
-      testToolDepends = [ hspec-meta ];
-      description = "Automatically discover and run Hspec tests";
-      license = lib.licenses.mit;
-      hydraPlatforms = lib.platforms.none;
-      mainProgram = "hspec-discover";
-      maintainers = [ lib.maintainers.maralorn ];
-    }
-  ) { };
-
   "hspec-discover" = callPackage (
     {
       mkDerivation,
@@ -356400,72 +355958,6 @@ self: {
     }
   ) { };
 
-  "hspec-meta_2_7_8" = callPackage (
-    {
-      mkDerivation,
-      ansi-terminal,
-      array,
-      base,
-      call-stack,
-      clock,
-      deepseq,
-      directory,
-      filepath,
-      QuickCheck,
-      quickcheck-io,
-      random,
-      setenv,
-      stm,
-      time,
-      transformers,
-    }:
-    mkDerivation {
-      pname = "hspec-meta";
-      version = "2.7.8";
-      sha256 = "0sfj0n2hy1r8ifysgbcmfdygcd7vyzr13ldkcp0l2ml337f8j0si";
-      isLibrary = true;
-      isExecutable = true;
-      libraryHaskellDepends = [
-        ansi-terminal
-        array
-        base
-        call-stack
-        clock
-        deepseq
-        directory
-        filepath
-        QuickCheck
-        quickcheck-io
-        random
-        setenv
-        stm
-        time
-        transformers
-      ];
-      executableHaskellDepends = [
-        ansi-terminal
-        array
-        base
-        call-stack
-        clock
-        deepseq
-        directory
-        filepath
-        QuickCheck
-        quickcheck-io
-        random
-        setenv
-        stm
-        time
-        transformers
-      ];
-      description = "A version of Hspec which is used to test Hspec itself";
-      license = lib.licenses.mit;
-      hydraPlatforms = lib.platforms.none;
-      mainProgram = "hspec-meta-discover";
-    }
-  ) { };
-
   "hspec-meta" = callPackage (
     {
       mkDerivation,
@@ -495263,41 +494755,6 @@ self: {
     }
   ) { };
 
-  "optparse-applicative_0_15_1_0" = callPackage (
-    {
-      mkDerivation,
-      ansi-wl-pprint,
-      base,
-      bytestring,
-      process,
-      QuickCheck,
-      transformers,
-      transformers-compat,
-    }:
-    mkDerivation {
-      pname = "optparse-applicative";
-      version = "0.15.1.0";
-      sha256 = "1ws6y3b3f6hsgv0ff0yp6lw4hba1rps4dnvry3yllng0s5gngcsd";
-      revision = "1";
-      editedCabalFile = "0zmhqkd96v2z1ilhqdkd9z4jgsnsxb8yi2479ind8m5zm9363zr9";
-      libraryHaskellDepends = [
-        ansi-wl-pprint
-        base
-        process
-        transformers
-        transformers-compat
-      ];
-      testHaskellDepends = [
-        base
-        bytestring
-        QuickCheck
-      ];
-      description = "Utilities and combinators for parsing command line options";
-      license = lib.licenses.bsd3;
-      hydraPlatforms = lib.platforms.none;
-    }
-  ) { };
-
   "optparse-applicative" = callPackage (
     {
       mkDerivation,
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 38a85aa064f1..b4f399174aa2 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -5,6 +5,7 @@
   pkgs,
   newScope,
   stdenv,
+  config,
 }:
 
 let
@@ -25,9 +26,6 @@ let
     "ghc924Binary"
     "ghc963Binary"
     "ghc984Binary"
-    # ghcjs
-    "ghcjs"
-    "ghcjs810"
   ];
 
   haskellLibUncomposable = import ../development/haskell-modules/lib {
@@ -460,13 +458,6 @@ in
         llvmPackages = pkgs.llvmPackages_18;
       };
 
-      ghcjs = compiler.ghcjs810;
-      ghcjs810 = callPackage ../development/compilers/ghcjs/8.10 {
-        bootPkgs = bb.packages.ghc810;
-        ghcjsSrcJson = ../development/compilers/ghcjs/8.10/git.json;
-        stage0 = ../development/compilers/ghcjs/8.10/stage0.nix;
-      };
-
       # The integer-simple attribute set contains all the GHC compilers
       # build with integer-simple instead of integer-gmp.
       integer-simple =
@@ -495,6 +486,10 @@ in
           )
         );
     }
+    // pkgs.lib.optionalAttrs config.allowAliases {
+      ghcjs = throw "'haskell.compiler.ghcjs' has been removed. Please use 'pkgsCross.ghcjs' instead."; # Added 2025-09-06
+      ghcjs810 = throw "'haskell.compiler.ghcjs810' has been removed. Please use 'pkgsCross.ghcjs' instead."; # Added 2025-09-06
+    }
   );
 
   # Default overrides that are applied to all package sets.
@@ -647,14 +642,6 @@ in
         compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-9.14.x.nix { };
       };
 
-      ghcjs = packages.ghcjs810;
-      ghcjs810 = callPackage ../development/haskell-modules rec {
-        buildHaskellPackages = ghc.bootPkgs;
-        ghc = bh.compiler.ghcjs810;
-        compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-8.10.x.nix { };
-        packageSetConfig = callPackage ../development/haskell-modules/configuration-ghcjs-8.x.nix { };
-      };
-
       # The integer-simple attribute set contains package sets for all the GHC compilers
       # using integer-simple instead of integer-gmp.
       integer-simple =
@@ -687,5 +674,9 @@ in
             buildHaskellPackages = bh.packages.native-bignum.${name};
           }
         );
+    }
+    // pkgs.lib.optionalAttrs config.allowAliases {
+      ghcjs = throw "'haskell.packages.ghcjs' has been removed. Please use 'pkgsCross.ghcjs' instead."; # Added 2025-09-06
+      ghcjs810 = throw "'haskell.packages.ghcjs810' has been removed. Please use 'pkgsCross.ghcjs' instead."; # Added 2025-09-06
     };
 }
diff --git a/pkgs/top-level/release-cross.nix b/pkgs/top-level/release-cross.nix
index de853ce49675..ec753700a532 100644
--- a/pkgs/top-level/release-cross.nix
+++ b/pkgs/top-level/release-cross.nix
@@ -212,7 +212,6 @@ in
 
   # Javascript
   ghcjs = mapTestOnCross systems.examples.ghcjs {
-    haskell.packages.ghcjs.hello = nativePlatforms;
     haskell.packages.native-bignum.ghcHEAD.hello = nativePlatforms;
     haskellPackages.hello = nativePlatforms;
   };
diff --git a/pkgs/top-level/release-haskell.nix b/pkgs/top-level/release-haskell.nix
index 13d5f02fbae6..c5dd07c0099e 100644
--- a/pkgs/top-level/release-haskell.nix
+++ b/pkgs/top-level/release-haskell.nix
@@ -238,24 +238,7 @@ let
   jobs = recursiveUpdateMany [
     (mapTestOn {
       haskellPackages = packagePlatforms pkgs.haskellPackages;
-      haskell.compiler =
-        packagePlatforms pkgs.haskell.compiler
-        // (lib.genAttrs
-          [
-            "ghcjs"
-            "ghcjs810"
-          ]
-          (ghcjsName: {
-            # We can't build ghcjs itself, since it exceeds 3GB (Hydra's output limit) due
-            # to the size of its bundled libs. We can however save users a bit of compile
-            # time by building the bootstrap ghcjs on Hydra. For this reason, we overwrite
-            # the ghcjs attributes in haskell.compiler with a reference to the bootstrap
-            # ghcjs attribute in their bootstrap package set (exposed via passthru) which
-            # would otherwise be ignored by Hydra.
-            bootGhcjs = (packagePlatforms pkgs.haskell.compiler.${ghcjsName}.passthru).bootGhcjs;
-          })
-        );
-
+      haskell.compiler = packagePlatforms pkgs.haskell.compiler;
       tests.haskell = packagePlatforms pkgs.tests.haskell;
 
       nixosTests = {
@@ -413,9 +396,6 @@ let
               # remove musl ghc865Binary since it is known to be broken and
               # causes an evaluation error on darwin.
               ghc865Binary = { };
-
-              ghcjs = { };
-              ghcjs810 = { };
             };
 
             # Get some cache going for MUSL-enabled GHC.