diff --git a/pkgs/data/fonts/iosevka/default.nix b/pkgs/data/fonts/iosevka/default.nix
index 04f8ebc613c5..c6c0c121dbc4 100644
--- a/pkgs/data/fonts/iosevka/default.nix
+++ b/pkgs/data/fonts/iosevka/default.nix
@@ -1,18 +1,47 @@
-{ stdenv, fetchzip }:
+{
+  stdenv, lib,
+  fetchFromGitHub, fetchurl,
+  runCommand, writeText,
+  nodejs, ttfautohint, otfcc
+}:
+
+with lib;
+
+let
+  installPackageLock = import ./package-lock.nix { inherit fetchurl lib; };
+in
 
 let
   version = "1.13.3";
-in fetchzip rec {
   name = "iosevka-${version}";
+  src = fetchFromGitHub {
+    owner = "be5invis";
+    repo ="Iosevka";
+    rev = "v${version}";
+    sha256 = "0wfhfiahllq8ngn0mybvp29cfcm7b8ndk3fyhizd620wrj50bazf";
+  };
+in
 
-  url = "https://github.com/be5invis/Iosevka/releases/download/v${version}/iosevka-pack-${version}.zip";
+stdenv.mkDerivation {
+  inherit name version src;
 
-  postFetch = ''
-    mkdir -p $out/share/fonts
-    unzip -j $downloadedFile \*.ttc -d $out/share/fonts/iosevka
+  nativeBuildInputs = [ nodejs ttfautohint otfcc ];
+
+  passAsFile = [ "installPackageLock" ];
+  installPackageLock = installPackageLock ./package-lock.json;
+
+  preConfigure = ''
+    HOME=$TMPDIR
+    source "$installPackageLockPath";
+    npm --offline rebuild
   '';
 
-  sha256 = "0103rjxcp2sis42xp7fh7g8i03h5snvs8n78lgsf79g8ssw0p9d4";
+  installPhase = ''
+    fontdir=$out/share/fonts/iosevka
+
+    mkdir -p $fontdir
+    cp -v dist/iosevka*/ttf/*.ttf $fontdir
+  '';
 
   meta = with stdenv.lib; {
     homepage = https://be5invis.github.io/Iosevka/;
@@ -23,6 +52,6 @@ in fetchzip rec {
     '';
     license = licenses.ofl;
     platforms = platforms.all;
-    maintainers = [ maintainers.cstrahan ];
+    maintainers = with maintainers; [ cstrahan jfrankenau ];
   };
 }
diff --git a/pkgs/data/fonts/iosevka/package-lock.json b/pkgs/data/fonts/iosevka/package-lock.json
new file mode 100644
index 000000000000..4e8a9be8807c
--- /dev/null
+++ b/pkgs/data/fonts/iosevka/package-lock.json
@@ -0,0 +1,1017 @@
+{
+  "name": "iosevka",
+  "version": "1.13.3",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "JSONStream": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.1.tgz",
+      "integrity": "sha1-cH92HgHa6eFvG8+TcDt4xwlmV5o=",
+      "requires": {
+        "jsonparse": "1.3.1",
+        "through": "2.3.8"
+      }
+    },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU="
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+    },
+    "bezier-js": {
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/bezier-js/-/bezier-js-2.2.3.tgz",
+      "integrity": "sha1-xVdBFqSjVkpxU41z4LDVFdqN3sU="
+    },
+    "builtin-modules": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
+      "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8="
+    },
+    "camelcase": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+      "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo="
+    },
+    "caryll-shapeops": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/caryll-shapeops/-/caryll-shapeops-0.2.1.tgz",
+      "integrity": "sha1-uEBMpQ5pAMB6vJNXubsAhbQEa8s=",
+      "requires": {
+        "bezier-js": "2.2.3",
+        "clipper-lib": "1.0.0"
+      }
+    },
+    "child-process-promise": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/child-process-promise/-/child-process-promise-2.2.1.tgz",
+      "integrity": "sha1-RzChHvYQ+tRQuPIjx50x172tgHQ=",
+      "requires": {
+        "cross-spawn": "4.0.2",
+        "node-version": "1.1.0",
+        "promise-polyfill": "6.0.2"
+      }
+    },
+    "clipper-lib": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/clipper-lib/-/clipper-lib-1.0.0.tgz",
+      "integrity": "sha1-6QLOsm4o7lz6YBSr33kKUe//Tss="
+    },
+    "cliui": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+      "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+      "requires": {
+        "string-width": "1.0.2",
+        "strip-ansi": "3.0.1",
+        "wrap-ansi": "2.1.0"
+      }
+    },
+    "clone": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/clone/-/clone-1.0.3.tgz",
+      "integrity": "sha1-KY1+IjFmD0DAA8LtMUDezz9TCF8="
+    },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
+    },
+    "coffee-script": {
+      "version": "1.12.7",
+      "resolved": "https://registry.npmjs.org/coffee-script/-/coffee-script-1.12.7.tgz",
+      "integrity": "sha512-fLeEhqwymYat/MpTPUjSKHVYYl0ec2mOyALEMLmzr5i1isuG+6jfI2j2d5oBO3VIzgUXgBVIcOT9uH1TFxBckw=="
+    },
+    "cross-spawn": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-4.0.2.tgz",
+      "integrity": "sha1-e5JHYhwjrf3ThWAEqCPL45dCTUE=",
+      "requires": {
+        "lru-cache": "4.1.1",
+        "which": "1.3.0"
+      }
+    },
+    "cubic2quad": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/cubic2quad/-/cubic2quad-1.1.1.tgz",
+      "integrity": "sha1-abGcYaP1tB7PLx1fro+wNBWqixU="
+    },
+    "decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA="
+    },
+    "deep-is": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ="
+    },
+    "defaults": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/defaults/-/defaults-1.0.3.tgz",
+      "integrity": "sha1-xlYFHpgX2f8I7YgUd/P+QBnz730=",
+      "requires": {
+        "clone": "1.0.3"
+      }
+    },
+    "error-ex": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.1.tgz",
+      "integrity": "sha1-+FWobOYa3E6GIcPNoh56dhLDqNw=",
+      "requires": {
+        "is-arrayish": "0.2.1"
+      }
+    },
+    "escodegen": {
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-1.9.0.tgz",
+      "integrity": "sha512-v0MYvNQ32bzwoG2OSFzWAkuahDQHK92JBN0pTAALJ4RIxEZe766QJPDR8Hqy7XNUy5K3fnVL76OqYAdc4TZEIw==",
+      "requires": {
+        "esprima": "3.1.3",
+        "estraverse": "4.2.0",
+        "esutils": "2.0.2",
+        "optionator": "0.8.2",
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+      "resolved": "https://registry.npmjs.org/escope/-/escope-1.0.3.tgz",
+      "integrity": "sha1-dZ3OhJbEJI/sLQyq9BCLzz8af10=",
+      "requires": {
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+          "integrity": "sha1-WuRpYyQ2ACBmdMyySgnhZnT83KE="
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+      "integrity": "sha1-2bs3uPjq+/Tm1O1reqKVarvTxMI=",
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+        "escope": "1.0.3",
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+        "esshorten": "1.1.1",
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+            "estraverse": "1.5.1",
+            "esutils": "1.0.0",
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+          }
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+          "resolved": "https://registry.npmjs.org/esprima/-/esprima-1.1.1.tgz",
+          "integrity": "sha1-W28VR/TRAuZw4UDFCb5ncdautUk="
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+          "integrity": "sha1-hno+jlip+EYYr7bC3bzZFrfLr3E="
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+          "integrity": "sha1-gVHTWOIMisx/t0XnRywAJf5JZXA="
+        },
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+          "integrity": "sha1-uo0znQykphDjo/FFucr0iAcVUFQ=",
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+          "integrity": "sha1-lxWotfXnWGz/BsgkngOc1zZNP1Q=",
+          "requires": {
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+            "fast-levenshtein": "1.0.7",
+            "levn": "0.2.5",
+            "prelude-ls": "1.1.2",
+            "type-check": "0.3.2",
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+          "integrity": "sha1-wkvBRspRfBRx9drL4lcbK3+eM0Y=",
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+          }
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+        "wordwrap": {
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+          "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc="
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+      "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM="
+    },
+    "esshorten": {
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+      "integrity": "sha1-F0+Wt8wmfkaHLYFOfbfCkL3/Yak=",
+      "requires": {
+        "escope": "1.0.3",
+        "estraverse": "4.1.1",
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+          "integrity": "sha1-9srKcokzqFDvkGYdDheYK6RxEaI="
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+      "integrity": "sha1-De4/7TH81GlhjOc0IJn8GvoL2xM="
+    },
+    "esutils": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
+      "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs="
+    },
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+      "integrity": "sha1-lEvs00zEHuMqY6n68nrVpl/Fl3c=",
+      "requires": {
+        "cross-spawn": "5.1.0",
+        "get-stream": "3.0.0",
+        "is-stream": "1.1.0",
+        "npm-run-path": "2.0.2",
+        "p-finally": "1.0.0",
+        "signal-exit": "3.0.2",
+        "strip-eof": "1.0.0"
+      },
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+          "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
+          "requires": {
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+            "shebang-command": "1.2.0",
+            "which": "1.3.0"
+          }
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+      "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
+      "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc="
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+    "find-up": {
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+      "integrity": "sha1-ay6YIrGizgpgq2TWEOzK1TyyTQ8=",
+      "requires": {
+        "path-exists": "2.1.0",
+        "pinkie-promise": "2.0.1"
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+    "fs-extra": {
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+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-3.0.1.tgz",
+      "integrity": "sha1-N5TzeMWLNC6n27sjCVEJxLO2IpE=",
+      "requires": {
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+        "jsonfile": "3.0.1",
+        "universalify": "0.1.1"
+      }
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+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.2.tgz",
+      "integrity": "sha1-9wLmMSfn4jHBYKgMFVSstw1QR+U="
+    },
+    "get-stream": {
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+      "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ="
+    },
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+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
+      "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg="
+    },
+    "hosted-git-info": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.5.0.tgz",
+      "integrity": "sha512-pNgbURSuab90KbTqvRPsseaTxOJCZBD0a7t+haSN33piP9cCM4l0CqdzAif2hUqm716UovKB2ROmiabGAKVXyg=="
+    },
+    "invert-kv": {
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+      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-1.0.0.tgz",
+      "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY="
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+      "integrity": "sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0="
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+      "integrity": "sha1-VAVy0096wxGfj3bDDLwbHgN6/74=",
+      "requires": {
+        "builtin-modules": "1.1.1"
+      }
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+    "is-fullwidth-code-point": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+      "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+      "requires": {
+        "number-is-nan": "1.0.1"
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+      "integrity": "sha1-Sw2hRCEE0bM2NA6AeX6GXPOffXI="
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+      "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA="
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+    "jsonfile": {
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+      "integrity": "sha1-pezG9l9T9mLEQVx2daAzHQmS7GY=",
+      "requires": {
+        "graceful-fs": "4.1.11"
+      }
+    },
+    "jsonparse": {
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+      "resolved": "https://registry.npmjs.org/jsonparse/-/jsonparse-1.3.1.tgz",
+      "integrity": "sha1-P02uSpH6wxX3EGL4UhzCOfE2YoA="
+    },
+    "lcid": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
+      "integrity": "sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=",
+      "requires": {
+        "invert-kv": "1.0.0"
+      }
+    },
+    "levn": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
+      "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
+      "requires": {
+        "prelude-ls": "1.1.2",
+        "type-check": "0.3.2"
+      }
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+    "libspiro-js": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/libspiro-js/-/libspiro-js-0.3.1.tgz",
+      "integrity": "sha1-hmUrAAmm2E6nmlMgvcpfAGEu5Dk="
+    },
+    "load-json-file": {
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+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-8.0.2.tgz",
+      "integrity": "sha1-YpmpBVsc78lp/355wdkY3Osiw2A=",
+      "requires": {
+        "camelcase": "4.1.0",
+        "cliui": "3.2.0",
+        "decamelize": "1.2.0",
+        "get-caller-file": "1.0.2",
+        "os-locale": "2.1.0",
+        "read-pkg-up": "2.0.0",
+        "require-directory": "2.1.1",
+        "require-main-filename": "1.0.1",
+        "set-blocking": "2.0.0",
+        "string-width": "2.1.1",
+        "which-module": "2.0.0",
+        "y18n": "3.2.1",
+        "yargs-parser": "7.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
+        },
+        "camelcase": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
+          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0="
+        },
+        "find-up": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
+          "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
+          "requires": {
+            "locate-path": "2.0.0"
+          }
+        },
+        "is-fullwidth-code-point": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
+        },
+        "load-json-file": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-2.0.0.tgz",
+          "integrity": "sha1-eUfkIUmvgNaWy/eXvKq8/h/inKg=",
+          "requires": {
+            "graceful-fs": "4.1.11",
+            "parse-json": "2.2.0",
+            "pify": "2.3.0",
+            "strip-bom": "3.0.0"
+          }
+        },
+        "os-locale": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-2.1.0.tgz",
+          "integrity": "sha512-3sslG3zJbEYcaC4YVAvDorjGxc7tv6KVATnLPZONiljsUncvihe9BQoVCEs0RZ1kmf4Hk9OBqlZfJZWI4GanKA==",
+          "requires": {
+            "execa": "0.7.0",
+            "lcid": "1.0.0",
+            "mem": "1.1.0"
+          }
+        },
+        "path-type": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/path-type/-/path-type-2.0.0.tgz",
+          "integrity": "sha1-8BLMuEFbcJb8LaoQVMPXI4lZTHM=",
+          "requires": {
+            "pify": "2.3.0"
+          }
+        },
+        "read-pkg": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-2.0.0.tgz",
+          "integrity": "sha1-jvHAYjxqbbDcZxPEv6xGMysjaPg=",
+          "requires": {
+            "load-json-file": "2.0.0",
+            "normalize-package-data": "2.4.0",
+            "path-type": "2.0.0"
+          }
+        },
+        "read-pkg-up": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-2.0.0.tgz",
+          "integrity": "sha1-a3KoBImE4MQeeVEP1en6mbO1Sb4=",
+          "requires": {
+            "find-up": "2.1.0",
+            "read-pkg": "2.0.0"
+          }
+        },
+        "string-width": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+          "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+          "requires": {
+            "is-fullwidth-code-point": "2.0.0",
+            "strip-ansi": "4.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "requires": {
+            "ansi-regex": "3.0.0"
+          }
+        },
+        "strip-bom": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+          "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM="
+        },
+        "which-module": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+          "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
+        },
+        "yargs-parser": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-7.0.0.tgz",
+          "integrity": "sha1-jQrELxbqVd69MyyvTEA4s+P139k=",
+          "requires": {
+            "camelcase": "4.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
+      "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
+      "requires": {
+        "camelcase": "3.0.0"
+      }
+    }
+  }
+}
diff --git a/pkgs/data/fonts/iosevka/package-lock.nix b/pkgs/data/fonts/iosevka/package-lock.nix
new file mode 100644
index 000000000000..4a7be92e7375
--- /dev/null
+++ b/pkgs/data/fonts/iosevka/package-lock.nix
@@ -0,0 +1,142 @@
+{ lib, fetchurl }:
+
+with lib; with builtins;
+
+let
+  # Convert a base64-encoded string into a list of quads and padding.
+  fromBase64 = str:
+    let
+      len = stringLength str;
+      quads = 3 * len - 4 * padding;
+      padding =
+        if hasSuffix "==" str then 2 else
+        if hasSuffix "=" str then 1 else
+        0;
+      chars = stringToCharacters (substring 0 (len - padding) str);
+      table = {
+        "A" = [0 0 0];
+        "B" = [0 0 1];
+        "C" = [0 0 2];
+        "D" = [0 0 3];
+        "E" = [0 1 0];
+        "F" = [0 1 1];
+        "G" = [0 1 2];
+        "H" = [0 1 3];
+        "I" = [0 2 0];
+        "J" = [0 2 1];
+        "K" = [0 2 2];
+        "L" = [0 2 3];
+        "M" = [0 3 0];
+        "N" = [0 3 1];
+        "O" = [0 3 2];
+        "P" = [0 3 3];
+        "Q" = [1 0 0];
+        "R" = [1 0 1];
+        "S" = [1 0 2];
+        "T" = [1 0 3];
+        "U" = [1 1 0];
+        "V" = [1 1 1];
+        "W" = [1 1 2];
+        "X" = [1 1 3];
+        "Y" = [1 2 0];
+        "Z" = [1 2 1];
+        "a" = [1 2 2];
+        "b" = [1 2 3];
+        "c" = [1 3 0];
+        "d" = [1 3 1];
+        "e" = [1 3 2];
+        "f" = [1 3 3];
+        "g" = [2 0 0];
+        "h" = [2 0 1];
+        "i" = [2 0 2];
+        "j" = [2 0 3];
+        "k" = [2 1 0];
+        "l" = [2 1 1];
+        "m" = [2 1 2];
+        "n" = [2 1 3];
+        "o" = [2 2 0];
+        "p" = [2 2 1];
+        "q" = [2 2 2];
+        "r" = [2 2 3];
+        "s" = [2 3 0];
+        "t" = [2 3 1];
+        "u" = [2 3 2];
+        "v" = [2 3 3];
+        "w" = [3 0 0];
+        "x" = [3 0 1];
+        "y" = [3 0 2];
+        "z" = [3 0 3];
+        "0" = [3 1 0];
+        "1" = [3 1 1];
+        "2" = [3 1 2];
+        "3" = [3 1 3];
+        "4" = [3 2 0];
+        "5" = [3 2 1];
+        "6" = [3 2 2];
+        "7" = [3 2 3];
+        "8" = [3 3 0];
+        "9" = [3 3 1];
+        "+" = [3 3 2];
+        "/" = [3 3 3];
+      };
+    in
+      take quads (concatMap (c: table.${c}) chars);
+
+  # Convert a list of quads with padding into a base16-encoded string.
+  toBase16 = quads:
+    if length quads == 0 then "" else
+    if length quads == 1 then throw "toBase16: odd quads" else
+    let
+      hexad = 4 * elemAt quads 0 + elemAt quads 1;
+      hexits = "0123456789abcdef";
+    in
+      substring hexad 1 hexits + toBase16 (drop 2 quads);
+in
+
+let
+  fetchResolved = { resolved, integrity, ... }:
+    let args = { url = resolved; } // integrityHash integrity; in
+      fetchurl args;
+  integrityHash = integrity:
+    if hasPrefix "sha1-" integrity then integritySHA1 integrity else
+    if hasPrefix "sha512-" integrity then integritySHA512 integrity else
+    throw "don't understand integrity: ${integrity}";
+  integritySHA1 = integrity:
+    { sha1 = toBase16 (fromBase64 (removePrefix "sha1-" integrity)); };
+  integritySHA512 = integrity:
+    { sha512 = toBase16 (fromBase64 (removePrefix "sha512-" integrity)); };
+in
+
+let
+  depend = name: attrs@{ version, dependencies ? {}, ... }:
+      {
+        inherit name version;
+        src = fetchResolved attrs;
+        depends = mapAttrsToList depend dependencies;
+      };
+  prepareDepend = { name, src, depends, ... }:
+    ''
+      unpackFile '${src}'
+      mv package '${name}'
+      mkdir -p '${name}/node_modules'
+      (
+          cd '${name}/node_modules'
+          ${concatMapStrings prepareDepend depends}
+      )
+    '';
+in
+
+packageLockFile:
+
+let
+  packageLock = fromJSON (readFile packageLockFile);
+  depends = mapAttrsToList depend packageLock.dependencies;
+in
+  ''
+    mkdir -p node_modules
+    (
+        cd node_modules
+        ${concatMapStrings prepareDepend depends}
+    )
+  ''
+
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 98b2c98ab3af..302f4443070c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -13392,7 +13392,9 @@ with pkgs;
 
   input-fonts = callPackage ../data/fonts/input-fonts { };
 
-  iosevka = callPackage ../data/fonts/iosevka { };
+  iosevka = callPackage ../data/fonts/iosevka {
+    nodejs = nodejs-8_x;
+  };
 
   ipafont = callPackage ../data/fonts/ipafont {};
   ipaexfont = callPackage ../data/fonts/ipaexfont {};