Change:
<del> { stdenv, libXScrnSaver, makeWrapper, fetchurl, wrapGAppsHook, gtk3, unzip, atomEnv, libuuid, at-spi2-atk }: </del> <ins> { stdenv, libXScrnSaver, makeWrapper, fetchurl, wrapGAppsHook, gtk3, unzip, atomEnv, libuuid, at-spi2-atk, at-spi2-core }@args: </ins> let <del> version = "4.2.8"; name = "electron-${version}"; throwSystem = throw "Unsupported system: ${stdenv.hostPlatform.system}"; meta = with stdenv.lib; { description = "Cross platform desktop application shell"; homepage = https://github.com/electron/electron; license = licenses.mit; maintainers = with maintainers; [ travisbhartwell manveru ]; platforms = [ "x86_64-darwin" "x86_64-linux" "i686-linux" "armv7l-linux" "aarch64-linux" ]; </del> <ins> mkElectron = import ./generic.nix args; in { electron_4 = mkElectron "4.2.12" { x86_64-linux = "72c5319c92baa7101bea3254a036c0cd3bcf257f4a03a0bb153668b7292ee2dd"; x86_64-darwin = "89b0e16bb9b7072ed7ed1906fccd08540acdd9f42dd8a29c97fa17d811b8c5e5"; i686-linux = "bf96b1736141737bb064e48bdb543302fd259de634b1790b7cf930525f47859f"; armv7l-linux = "2d970b3020627e5381fd4916dd8fa50ca9556202c118ab4cba09c293960689e9"; aarch64-linux = "938b7cc5f917247a120920df30374f86414b0c06f9f3dc7ab02be1cadc944e55"; </ins> }; <del> linux = { inherit name version meta; src = { i686-linux = fetchurl { url = "https://github.com/electron/electron/releases/download/v${version}/electron-v${version}-linux-ia32.zip"; sha256 = "1sikxr0pfpi3wrf1d7fia1vhb1gacsy9pr7qc0fycgnzsy2nvf8n"; }; x86_64-linux = fetchurl { url = "https://github.com/electron/electron/releases/download/v${version}/electron-v${version}-linux-x64.zip"; sha256 = "0wc954cjc13flvdh8rkmnifdx6nirf273v1n76lsklbsq6c73i4h"; }; armv7l-linux = fetchurl { url = "https://github.com/electron/electron/releases/download/v${version}/electron-v${version}-linux-armv7l.zip"; sha256 = "0370ygpsm42drm70gj12i6mg960wchhqis7zz8i9is2ax1b2xjp5"; }; aarch64-linux = fetchurl { url = "https://github.com/electron/electron/releases/download/v${version}/electron-v${version}-linux-arm64.zip"; sha256 = "0vl90lsjcsgcxivbaq526ffbx3lsh6axfmpkfxl8cj2jlbsg593k"; }; }.${stdenv.hostPlatform.system} or throwSystem; buildInputs = [ gtk3 ]; nativeBuildInputs = [ unzip makeWrapper wrapGAppsHook ]; dontWrapGApps = true; # electron is in lib, we need to wrap it manually buildCommand = '' mkdir -p $out/lib/electron $out/bin unzip -d $out/lib/electron $src ln -s $out/lib/electron/electron $out/bin fixupPhase patchelf  --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)"  --set-rpath "${atomEnv.libPath}:${stdenv.lib.makeLibraryPath [ libuuid at-spi2-atk ]}:$out/lib/electron"  $out/lib/electron/electron wrapProgram $out/lib/electron/electron  --prefix LD_PRELOAD : ${stdenv.lib.makeLibraryPath [ libXScrnSaver ]}/libXss.so.1  "''${gappsWrapperArgs[@]}" ''; </del> <ins> electron_5 = mkElectron "5.0.13" { x86_64-linux = "8ded43241c4b7a6f04f2ff21c75ae10e4e6db1794e8b1b4f7656c0ed21667f8f"; x86_64-darwin = "589834815fb9667b3c1c1aa6ccbd87d50e5660ecb430f6b475168b772b9857cd"; i686-linux = "ccf4a5ed226928a30bd3ea830913d99853abb089bd4a6299ffa9fa0daa8d026a"; armv7l-linux = "96ad83802bc61d87bb952027d49e5dd297f58e4493e66e393b26e51e09065add"; aarch64-linux = "01f0fd313b060fb28a1022d68fb224d415fa22986e2a8f4aded6424b65e35add"; </ins> }; <del> darwin = { inherit name version meta; src = fetchurl { url = "https://github.com/electron/electron/releases/download/v${version}/electron-v${version}-darwin-x64.zip"; sha256 = "083v8k17b596fa63a7qrwyn2k8pd5vmg9yijbqbnpfcg4ja3bjx9"; }; buildInputs = [ unzip ]; </del> <ins> electron_6 = mkElectron "6.1.7" { x86_64-linux = "7fe94fc1edebe2f5645056a4300fc642c04155e55da8dd4ee058a0c0ef835ae8"; x86_64-darwin = "1c790a4cbda05f1c136d18fa6a09bdb09a1941f521207466756a3e95e343c485"; i686-linux = "1afd8ea79acb2b4782fb459e084549ed4cd4ead779764829b1d862148359eae5"; armv7l-linux = "14f2ea0459f0dda8c566b0fa4a2fe755f4220bbae313ea0c453861ac2f803196"; aarch64-linux = "80e05c1a0b51c335483666e959c1631a089246986b7fc3a4f9ee1288a57a602a"; }; </ins> <del> buildCommand = '' mkdir -p $out/Applications unzip $src mv Electron.app $out/Applications mkdir -p $out/bin ln -s $out/Applications/Electron.app/Contents/MacOs/Electron $out/bin/electron ''; </del> <ins> electron_7 = mkElectron "7.1.10" { x86_64-linux = "296f034ac9a00afa4dc99ed145410c015af3f59cd7e9becc7709d70a4f8a9ebf"; x86_64-darwin = "10eb453c2b19948777a6f404fbdbdd48464a4cd63db16bd3ce66b60dda016724"; i686-linux = "681b6440d4f0f7ffa29a34610ef41103d72937d6e524d81fd2d0fa8d9eb67936"; armv7l-linux = "2c09e9a77f1da152d766dc2e43719e2852b70f917229466a2ac457416d1374f7"; aarch64-linux = "1dad780b872bbc069eb1cac9ff4ec8f0b8d200153ab7f51397e27219094db1f0"; </ins> }; <del> in stdenv.mkDerivation (if stdenv.isDarwin then darwin else linux) </del> <ins> electron_8 = mkElectron "8.0.0" { x86_64-linux = "b457a2ece83bb8a2efea42e75403740cbba051a64e325288760046b8999dd1c9"; x86_64-darwin = "3f96dfa1d4e0313d11b9e5c66e2df161cfdb30685ee9dadcc779bcad2fb3876e"; i686-linux = "0633ac2b6b6d00302e0e5df224d0e808e4ea9ecc14643e8534027e49b20436fb"; armv7l-linux = "8d1f3daa86c77e7aceb8c8e4491c094e789951c7d475fc536b85fe7d279794bf"; aarch64-linux = "484c04204478e8594d66f8bd332529c0c5eecfd71ee1705cc0478fa59c6818ee"; }; } </ins>

Discussion:
Describe the bug ^ what is says. They're several months out of date. Here are the currently supported versions: cc