diff --git a/.vim.custom b/.vim.custom
index 7444394..14785cb 100644
--- a/.vim.custom
+++ b/.vim.custom
@@ -1,14 +1,5 @@
 function s:hdevtools_options(rgs)
-	return join(map(a:rgs, "'-g ' . v:val"))
-endfunction
-
-function s:discover_cabal_sandbox(glob)
-	let l:sandboxes = split(glob(a:glob, "."), "\n")
-	if len(l:sandboxes) > 0
-		return ['-no-user-package-db', '-package-db=' . l:sandboxes[-1]]
-	else
-		return []
-	endif
+	return join(["-s", "/tmp/" . substitute(system("sha1sum <<< $PWD | cut -d' ' -f1"), '\n\+$', '', '') . ".sock"] + map(a:rgs, "'-g ' . v:val"))
 endfunction
 
 let g:syntastic_haskell_hdevtools_args = s:hdevtools_options
@@ -23,5 +14,5 @@ let g:syntastic_haskell_hdevtools_args = s:hdevtools_options
 	\ , '-Wall'
 	\ , '-fno-warn-unused-do-bind'
 	\ , '-fno-warn-type-defaults'
-	\ ] + s:discover_cabal_sandbox(".cabal-sandbox/*.conf.d")
+	\ ]
 	\ )
diff --git a/default.nix b/default.nix
index 6d592b6..3656fcf 100644
--- a/default.nix
+++ b/default.nix
@@ -1,2 +1,9 @@
-{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7101" }:
-nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./ldap-client.nix {}
+{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }: let
+  ghc = nixpkgs.pkgs.haskell.packages.${compiler};
+  npm = import ./npm {};
+in
+  ghc.callPackage ./package.nix {
+    mkDerivation = args: ghc.mkDerivation(args // {
+      buildTools = (if args ? buildTools then args.buildTools else []) ++ [ npm.nodePackages.ldapjs ];
+    });
+  }
diff --git a/npm/.nixfromnpm-version b/npm/.nixfromnpm-version
new file mode 100644
index 0000000..bcaffe1
--- /dev/null
+++ b/npm/.nixfromnpm-version
@@ -0,0 +1 @@
+0.7.0
\ No newline at end of file
diff --git a/npm/default.nix b/npm/default.nix
new file mode 100644
index 0000000..71c6258
--- /dev/null
+++ b/npm/default.nix
@@ -0,0 +1,9 @@
+{ nodejsVersion ? "4.1", npm3 ? false, pkgs ? import <nixpkgs> {} }:
+let
+    nodeLib = import ./nodeLib {
+      inherit pkgs npm3 nodejsVersion;
+      self = nodeLib;
+    };
+    in nodeLib.generatePackages {
+      rootPath = ./nodePackages;
+    }
\ No newline at end of file
diff --git a/npm/nodeLib/buildNodePackage.nix b/npm/nodeLib/buildNodePackage.nix
new file mode 100644
index 0000000..79609cd
--- /dev/null
+++ b/npm/nodeLib/buildNodePackage.nix
@@ -0,0 +1,394 @@
+{
+  # Provides the mkDerivation function.
+  stdenv,
+  # Lets us run a command.
+  runCommand,
+  # Derivation for nodejs and npm.
+  nodejs,
+  # Which version of npm to use.
+  npm ? nodejs,
+  # List of required native build inputs.
+  neededNatives,
+  # Self-reference for overriding purposes.
+  buildNodePackage
+}:
+
+let
+  # The path within $out/lib to find a package. If the package does not
+  # have a namespace, it will simply be in `node_modules`, and otherwise it
+  # will appear in `node_modules/@namespace`.
+  modulePath = pkg: if pkg.namespace == null then "node_modules"
+                    else "node_modules/@${pkg.namespace}";
+
+  # The path to the package within its modulePath. Just appending the name
+  # of the package.
+  pathInModulePath = pkg: "${modulePath pkg}/${pkg.basicName}";
+in
+
+{
+  # Used for private packages. Indicated in the name field of the
+  # package.json, e.g. "@mynamespace/mypackage". Public packages will not
+  # need this.
+  namespace ? null,
+
+  # The name of the package. If it's a private package with a namespace,
+  # this should not contain the namespace.
+  name,
+
+  # Version of the package. This should follow the semver standard, although
+  # we don't explicitly enforce that in this function.
+  version,
+
+  # Source of the package; can be a tarball or a folder on the filesystem.
+  src,
+
+  # by default name of nodejs interpreter e.g. "nodejs-<version>-${name}"
+  namePrefix ? "${nodejs.name}-" +
+               (if namespace == null then "" else "${namespace}-"),
+
+  # List or attribute set of dependencies
+  deps ? {},
+
+  # List or attribute set of peer depencies
+  peerDependencies ? {},
+
+  # List or attribute set of optional dependencies
+  optionalDependencies ? {},
+
+  # List of optional dependencies to skip
+  skipOptionalDependencies ? [],
+
+  # List or set of development dependencies (or null).
+  devDependencies ? null,
+
+  # If true and devDependencies are not null, the package will be
+  # installed contingent on successfully running tests.
+  doCheck ? devDependencies != null,
+
+  # Additional flags passed to npm install
+  flags ? "",
+
+  # Command to be run before shell hook
+  preShellHook ? "",
+
+  # Command to be run after shell hook
+  postShellHook ? "",
+
+  # Same as https://docs.npmjs.com/files/package.json#os
+  os ? [],
+
+  # Same as https://docs.npmjs.com/files/package.json#cpu
+  cpu ? [],
+
+  # Attribute set of already resolved deps (internal),
+  # for avoiding infinite recursion
+  resolvedDeps ? {},
+
+  ...
+} @ args:
+
+let
+  inherit (stdenv.lib) fold removePrefix hasPrefix subtractLists isList flip
+                       intersectLists isAttrs listToAttrs nameValuePair
+                       mapAttrs filterAttrs attrNames elem concatMapStrings
+                       attrValues getVersion flatten remove concatStringsSep;
+
+  # whether we should run tests.
+  shouldTest = doCheck && devDependencies != null;
+
+  # The package name as it appears in the package.json. This contains a
+  # namespace if there is one, so it will be a distinct identifier for
+  # different packages.
+  pkgName = if namespace == null then name else "@${namespace}/${name}";
+
+  # We create a `self` object for self-referential expressions. It
+  # bottoms out in a call to `mkDerivation` at the end.
+  self = let
+    sources = runCommand "node-sources" {} ''
+      tar --no-same-owner --no-same-permissions -xf ${nodejs.src}
+      mv $(find . -type d -mindepth 1 -maxdepth 1) $out
+    '';
+
+    platforms = if os == [] then nodejs.meta.platforms else
+      fold (entry: platforms:
+        let
+          filterPlatforms =
+            stdenv.lib.platforms.${removePrefix "!" entry} or [];
+        in
+          # Ignore unknown platforms
+          if filterPlatforms == [] then (if platforms == [] then nodejs.meta.platforms else platforms)
+          else
+            if hasPrefix "!" entry then
+              subtractLists (intersectLists filterPlatforms nodejs.meta.platforms) platforms
+            else
+              platforms ++ (intersectLists filterPlatforms nodejs.meta.platforms)
+      ) [] os;
+
+    toAttrSet = obj: if isAttrs obj then obj else
+      (listToAttrs (map (x: nameValuePair x.name x) obj));
+
+    mapDependencies = deps: filterFunc: let
+        attrDeps = toAttrSet deps;
+      in rec {
+        # All required node modules, without already resolved dependencies
+        # Also override with already resolved dependencies
+        requiredDeps = mapAttrs (name: dep:
+          dep.override {resolvedDeps = resolvedDeps // { "${name}" = self; };}
+        ) (filterAttrs filterFunc
+            (removeAttrs attrDeps (attrNames resolvedDeps)));
+
+        # Recursive dependencies that we want to avoid with shim creation
+        recursiveDeps = filterAttrs filterFunc
+                          (removeAttrs attrDeps (attrNames requiredDeps));
+      };
+
+    # Filter out self-referential dependencies.
+    _dependencies = mapDependencies deps (name: dep:
+      dep.pkgName != pkgName);
+
+    # Filter out self-referential peer dependencies.
+    _peerDependencies = mapDependencies peerDependencies (name: dep:
+      dep.pkgName != pkgName);
+
+    # Filter out any optional dependencies which don't build correctly.
+    _optionalDependencies = mapDependencies optionalDependencies (name: dep:
+      (builtins.tryEval dep).success &&
+      !(elem dep.pkgName skipOptionalDependencies)
+    );
+
+    # Required dependencies are those that we haven't filtered yet.
+    requiredDependencies =
+      _dependencies.requiredDeps //
+      _optionalDependencies.requiredDeps //
+      _peerDependencies.requiredDeps;
+
+    recursiveDependencies =
+      _dependencies.recursiveDeps //
+      _optionalDependencies.recursiveDeps //
+      _peerDependencies.recursiveDeps;
+
+    npmFlags = concatStringsSep " " ([
+      # We point the registry at something that doesn't exist. This will
+      # mean that NPM will fail if any of the dependencies aren't met, as it
+      # will attempt to hit this registry for the missing dependency.
+      "--registry=fakeprotocol://notaregistry.$UNIQNAME.derp"
+      # These flags make failure fast, as otherwise NPM will spin for a while.
+      "--fetch-retry-mintimeout=0"
+      "--fetch-retry-maxtimeout=10"
+      # This will disable any user-level npm configuration.
+      "--userconfig=/dev/null"
+      # This flag is used for packages which link against the node headers.
+      "--nodedir=${sources}"
+    ] ++ (if isList flags then flags else [flags]));
+
+    # A bit of bash to check that variables are set.
+    checkSet = vars: concatStringsSep "\n" (flip map vars (var: ''
+      [[ -z $${var} ]] && { echo "${var} is not set."; exit 1; }
+    ''));
+
+    mkDerivationArgs = {
+      inherit src;
+
+      # Define some environment variables that we will use in the build.
+      prePatch = ''
+        export HASHEDNAME=$(echo "$propagatedNativeBuildInputs $name" \
+                          | md5sum | awk '{print $1}')
+        export UNIQNAME="''${HASHEDNAME:0:10}-${name}-${version}"
+        export BUILD_DIR=$TMPDIR/$UNIQNAME-build
+      '';
+
+      patchPhase = ''
+        runHook prePatch
+        patchShebangs $PWD
+
+        # Remove any impure dependencies from the package.json (see script
+        # for details)
+        node ${./removeImpureDependencies.js}
+
+        # We do not handle shrinkwraps yet
+        rm npm-shrinkwrap.json 2>/dev/null || true
+
+        # Repackage source into a tarball, so npm pre/post publish hooks are
+        # not triggered,
+        mkdir -p $BUILD_DIR
+        GZIP=-1 tar -czf $BUILD_DIR/package.tgz ./
+        export PATCHED_SRC=$BUILD_DIR/package.tgz
+        runHook postPatch
+      '';
+
+      configurePhase = ''
+        runHook preConfigure
+        (
+          ${checkSet ["BUILD_DIR"]}
+          mkdir -p $BUILD_DIR
+          cd $BUILD_DIR
+          # Symlink or copy dependencies for node modules
+          # copy is needed if dependency has recursive dependencies,
+          # because node can't follow symlinks while resolving recursive deps.
+          ${
+            let
+              link = dep: ''
+                ${if dep.recursiveDeps == [] then "ln -sfv" else "cp -rf"} \
+                  ${dep}/lib/${pathInModulePath dep} ${modulePath dep}
+              '';
+            in
+            flip concatMapStrings (attrValues requiredDependencies) (dep: ''
+              mkdir -p ${modulePath dep}
+              ${link dep}
+              ${concatMapStrings link (attrValues dep.peerDependencies)}
+            '')}
+
+          # Create shims for recursive dependenceies
+          ${concatMapStrings (dep: ''
+            mkdir -p ${modulePath dep}
+            cat > ${pathInModulePath dep}/package.json <<EOF
+            {
+                "name": "${dep.pkgName}",
+                "version": "${getVersion dep}"
+            }
+            EOF
+          '') (attrValues recursiveDependencies)}
+
+          # Create dummy package.json file
+          cat <<EOF > package.json
+        {"name":"dummy-for-$UNIQNAME","version":"0.0.0", "license":"MIT",
+         "description":"Dummy package file for building $name",
+         "repository":{"type":"git","url":"http://$UNIQNAME.com"}}
+        EOF
+
+          # Create dummy readme
+          echo "Dummy package" > README.md
+        )
+
+        export HOME=$BUILD_DIR
+        runHook postConfigure
+      '';
+
+      buildPhase = ''
+        runHook preBuild
+
+        # Install package
+        (
+          ${checkSet ["BUILD_DIR" "PATCHED_SRC"]}
+
+          echo "Building $name in $BUILD_DIR"
+          cd $BUILD_DIR
+          HOME=$PWD npm install $PATCHED_SRC ${npmFlags} || {
+            npm list
+            exit 1
+          }
+        )
+
+        runHook postBuild
+      '';
+
+      installPhase = ''
+        runHook preInstall
+
+        (
+          cd $BUILD_DIR
+
+          # Remove shims
+          ${concatMapStrings (dep: ''
+            rm ${pathInModulePath dep}/package.json
+            rmdir ${modulePath dep}
+          '') (attrValues recursiveDependencies)}
+
+          # Install the package that we just built.
+          mkdir -p $out/lib/${modulePath self}
+
+          # Move the folder that was created for this path to $out/lib.
+          mv ${pathInModulePath self} $out/lib/${pathInModulePath self}
+
+          # Remove the node_modules subfolder from there, and instead put things
+          # in $PWD/node_modules into that folder.
+          rm -rf $out/lib/${pathInModulePath self}/node_modules
+          cp -r node_modules $out/lib/${pathInModulePath self}/node_modules
+
+          if [ -e "$out/lib/${pathInModulePath self}/man" ]; then
+            mkdir -p $out/share
+            for dir in $out/lib/${pathInModulePath self}/man/*; do          #*/
+              mkdir -p $out/share/man/$(basename "$dir")
+              for page in $dir/*; do                                        #*/
+                ln -sv $page $out/share/man/$(basename "$dir")
+              done
+            done
+          fi
+
+          # Move peer dependencies to node_modules
+          ${concatMapStrings (dep: ''
+            mkdir -p ${modulePath dep}
+            mv ${pathInModulePath dep} $out/lib/${modulePath dep}
+          '') (attrValues _peerDependencies.requiredDeps)}
+
+          # Install binaries and patch shebangs. These are always found in
+          # node_modules/.bin, regardless of a package namespace.
+          mv node_modules/.bin $out/lib/node_modules 2>/dev/null || true
+          if [ -d "$out/lib/node_modules/.bin" ]; then
+            ln -sv $out/lib/node_modules/.bin $out/bin
+            patchShebangs $out/lib/node_modules/.bin
+          fi
+        )
+
+        runHook postInstall
+      '';
+
+      shellHook = ''
+        ${preShellHook}
+        export PATH=${npm}/bin:${nodejs}/bin:$(pwd)/node_modules/.bin:$PATH
+        mkdir -p node_modules
+        ${concatMapStrings (dep: ''
+          mkdir -p ${modulePath dep}
+          ln -sfv ${dep}/lib/${pathInModulePath dep} ${pathInModulePath dep}
+        '') (attrValues requiredDependencies)}
+        ${postShellHook}
+      '';
+
+      # Stipping does not make a lot of sense in node packages
+      dontStrip = true;
+
+      meta = {
+        inherit platforms;
+        maintainers = [ stdenv.lib.maintainers.offline ];
+      };
+
+      # Propagate pieces of information about the package so that downstream
+      # packages can reflect on them.
+      passthru.pkgName = pkgName;
+      passthru.basicName = name;
+      passthru.namespace = namespace;
+      passthru.version = version;
+      passthru.peerDependencies = _peerDependencies.requiredDeps;
+      passthru.recursiveDeps =
+        (flatten (
+          map (dep: remove name dep.recursiveDeps) (attrValues requiredDependencies)
+        )) ++
+        (attrNames recursiveDependencies);
+
+      # Add an 'override' attribute, which will call `buildNodePackage` with the
+      # given arguments overridden.
+      passthru.override = newArgs: buildNodePackage (args // newArgs);
+    } // (removeAttrs args ["deps" "resolvedDeps" "optionalDependencies"
+                            "devDependencies"]) // {
+      name = "${namePrefix}${name}-${version}";
+
+      # Run the node setup hook when this package is a build input
+      propagatedNativeBuildInputs = (args.propagatedNativeBuildInputs or []) ++
+                                    [ npm nodejs ];
+
+      nativeBuildInputs =
+        (args.nativeBuildInputs or []) ++ neededNatives ++
+        (attrValues requiredDependencies);
+
+      # Expose list of recursive dependencies upstream, up to the package that
+      # caused recursive dependency
+      recursiveDeps =
+        (flatten (
+          map (dep: remove name dep.recursiveDeps) (attrValues requiredDependencies)
+        )) ++
+        (attrNames recursiveDependencies);
+    };
+
+    in stdenv.mkDerivation mkDerivationArgs;
+
+in self
diff --git a/npm/nodeLib/default.nix b/npm/nodeLib/default.nix
new file mode 100644
index 0000000..2cb1eb5
--- /dev/null
+++ b/npm/nodeLib/default.nix
@@ -0,0 +1,210 @@
+/*
+A set of tools for generating node packages, such as to be imported by
+default.nix files generated by nixfromnpm.
+*/
+
+{
+  # Self-reference so that we can pass through to downstream libraries
+  self,
+  # Base set of packages, i.e. nixpkgs.
+  pkgs,
+  # Version of nodejs.
+  nodejsVersion ? "4.1",
+  # Whether to use npm3 (requires a prebuilt tarball of npm3).
+  npm3 ? true
+}:
+
+let
+  # Function to replace dots with something
+  replaceDots = c: replaceChars ["."] [c];
+  inherit (builtins) readDir removeAttrs length getEnv elemAt hasAttr;
+  inherit (pkgs.lib) attrNames attrValues filterAttrs flip foldl
+                     hasSuffix hasPrefix removeSuffix replaceChars
+                     optional optionals stringToCharacters
+                     concatStrings tail splitString;
+  inherit (pkgs.stdenv) isLinux;
+
+  # Function to remove the first character of a string.
+  dropFirstChar = str: concatStrings (tail (stringToCharacters str));
+
+  # Like a for loop.
+  for = flip map;
+
+  # Concatenate a list of sets.
+  joinSets = foldl (a: b: a // b) {};
+
+  # Extracts a tarball containing a bootstrapped version of npm 3.
+  # This tarball must have been previously generated by an invocation
+  # of nixfromnpm, but one of these should be included in the
+  # nixfromnpm distribution (if not, run the `gen_npm3` script).
+  npm3-src = pkgs.runCommand "npm3" {src=./npm3.tar.gz;} ''
+    mkdir -p $out && cd $out && tar -xf $src
+  '';
+
+  # Builds the extracted nix file. Since of course it can't use npm3,
+  # being that it hasn't been built yet, we disable npm3 for this.
+  _npm3 = import npm3-src {
+    inherit pkgs nodejsVersion;
+    npm3 = false;
+   };
+
+  # Parse the `NPM_AUTH_TOKENS` environment variable to discover
+  # namespace-token associations and turn them into an attribute set
+  # which we can use as an input to the fetchPrivateNpm function.
+  # Split the variable on ':', then turn each k=v element in
+  # the list into an attribute set and join all of those sets.
+  namespaceTokens = joinSets (
+    for (splitString ":" (getEnv "NPM_AUTH_TOKENS")) (kvPair:
+      let kv = splitString "=" kvPair; in
+      if length kv != 2 then {}
+      else {"${elemAt kv 0}" = elemAt kv 1;}));
+
+  # A function similar to fetchUrl but allows setting of custom headers.
+  fetchUrlWithHeaders = pkgs.callPackage ./fetchUrlWithHeaders.nix {};
+
+  # Uses the parsed namespace tokens to create a function that can
+  # fetch a private package from an npm repo.
+  fetchPrivateNpm = {namespace, headers ? {}, ...}@args:
+    if !(hasAttr namespace namespaceTokens)
+    then throw "NPM_AUTH_TOKENS does not contain namespace ${namespace}"
+    else let
+      Authorization = "Bearer ${namespaceTokens.${namespace}}";
+      headers = {inherit Authorization;} // headers;
+    in
+    fetchUrlWithHeaders (removeAttrs args ["namespace"] // {inherit headers;});
+in
+
+rec {
+  nodejs = pkgs."nodejs-${replaceDots "_" nodejsVersion}" or (
+    throw "The given nodejs version ${nodejsVersion} has not been defined."
+  );
+  buildNodePackage = import ./buildNodePackage.nix ({
+    inherit (pkgs) stdenv runCommand;
+    inherit nodejs buildNodePackage;
+    neededNatives = [pkgs.python] ++ optionals isLinux [pkgs.utillinux];
+  } // (if npm3 then {npm = _npm3;} else {}));
+  # A generic package that will fail to build. This is used to indicate
+  # packages that are broken, without failing the entire generation of
+  # a package expression.
+  brokenPackage = {name, reason}:
+    let
+     deriv = pkgs.stdenv.mkDerivation {
+        name = "BROKEN-${name}";
+        buildCommand = ''
+          echo "Package ${name} is broken: ${reason}"
+          exit 1
+        '';
+        passthru.withoutTests = deriv;
+        passthru.pkgName = name;
+        passthru.basicName = "BROKEN";
+        passthru.namespace = null;
+        passthru.version = "BROKEN";
+        passthru.override = _: deriv;
+        passthru.recursiveDeps = [];
+        passthru.peerDependencies = {};
+      };
+    in
+    deriv;
+
+  # List a directory after filtering the files.
+  lsFilter = pred: dir: attrNames (filterAttrs pred (readDir dir));
+
+  # Checks the name and type of a listing to grab non-dotfile dirs.
+  isRegDir = name: type: type == "directory" && !(hasPrefix "." name);
+
+  # Discover all of the node packages in a folder and turn them into a set
+  # mapping `<name>_<version>` to the expression to build that package.
+  discoverPackages = {callPackage, rootPath}:
+    # if true then throw "huh? ${rootPath}" else
+    let
+    # Names of NPM packages defined in this directory. Don't take
+    # files that start with '@'.
+    nodeDirs = lsFilter (n: t: isRegDir n t && !(hasPrefix "@" n))
+                        (/. + rootPath);
+    # Generate the package expression from a package name and .nix path.
+    toPackage = name: filepath: let
+      versionRaw = removeSuffix ".nix" filepath; # Raw version, i.e. "1.2.4"
+      # Join with package name to make the variable name.
+      varName = "${replaceDots "-" name}_${replaceDots "-" versionRaw}";
+      in
+      # Return the singleton set which maps that name to the actual expression.
+      {"${varName}" = callPackage (/. + rootPath + "/${name}/${filepath}") {};};
+    in
+    # For each directory, and each .nix file in it, create a package from that.
+    joinSets (for nodeDirs (pkgName: let
+      pkgDir = /. + rootPath + "/${pkgName}";
+      # List of .nix files in the directory (excluding symlinks).
+      versionFiles = lsFilter (name: type: type == "regular" &&
+                               hasSuffix ".nix" name)
+                               pkgDir;
+      # Check if there is a `latest.nix` file
+      hasLatest = lsFilter (n: _: n == "latest.nix") pkgDir != [];
+      in
+      joinSets (
+        # Find all of the versions listed in the folder.
+        map (toPackage pkgName) versionFiles ++
+        # If the folder has a `latest.nix` file, link the bare name of
+        # the package to that file.
+        optional hasLatest {
+          "${replaceDots "-" pkgName}" = callPackage
+                           (/. + rootPath + "/${pkgName}/latest.nix") {};
+        })));
+
+  # Same as above, except that we take all of the namespaced packages;
+  # these packages are in folders prefaced with `@`, and contain
+  # packages in that folder. So, for example the path `@foo/bar` is
+  # the path to all of the versions of the `bar` package under the
+  # namespace `foo`.
+  discoverNamespacePackages = {callPackage, rootPath}: let
+    isNsDir = name: type: type == "directory" && hasPrefix "@" name;
+    # Names of NPM packages defined in this directory.
+    namespaceDirs = lsFilter isNsDir (/. + rootPath);
+    in
+    # For each namespace directory, each package folder in it, and
+    # each .nix file in that, create a package from that and then
+    # create a namespace out of that.
+    joinSets (for namespaceDirs (nsDirName: {
+      "${dropFirstChar nsDirName}" = discoverPackages {
+          inherit callPackage;
+          rootPath = /. + rootPath + "/${nsDirName}";
+        };
+      }));
+
+  # The function that a default.nix can call into which will scan its
+  # directory for all of the package files and generate a big attribute set
+  # for all of them. Re-exports the `callPackage` function and all of the
+  # attribute sets, as well as the nodeLib.
+  generatePackages = {rootPath, extensions ? []}:
+    let
+      callPackageWith = pkgSet: path: overridingArgs: let
+        inherit (builtins) intersectAttrs functionArgs;
+        inherit (pkgs.lib) filterAttrs;
+        # The path must be a function; import it here.
+        func = import path;
+        # Get the arguments to the function; e.g. "{a=false; b=true;}", where
+        # a false value is an argument that has no default.
+        funcArgs = functionArgs func;
+        # Take only the arguments that don't have a default.
+        noDefaults = filterAttrs (_: v: v == false) funcArgs;
+        # Intersect this set with the package set to create the arguments to
+        # the function.
+        satisfyingArgs = intersectAttrs noDefaults pkgSet;
+        # Override these arguments with whatever's passed in.
+        actualArgs = satisfyingArgs // overridingArgs;
+        # Call the function with these args to get a derivation.
+        deriv = func actualArgs;
+        in deriv;
+
+      callPackage = callPackageWith {
+        inherit fetchUrlWithHeaders namespaces namespaceTokens;
+        inherit pkgs nodePackages buildNodePackage brokenPackage;
+      };
+      nodePackages = joinSets (map (e: e.nodePackages) extensions) //
+                     discoverPackages {inherit callPackage rootPath;};
+      namespaces = joinSets (map (e: e.namespaces) extensions) //
+                   discoverNamespacePackages {inherit callPackage rootPath;};
+    in {
+      inherit nodePackages callPackage namespaces namespaceTokens pkgs;
+      nodeLib = self;
+    };
+}
diff --git a/npm/nodeLib/fetch.py b/npm/nodeLib/fetch.py
new file mode 100644
index 0000000..5aeed86
--- /dev/null
+++ b/npm/nodeLib/fetch.py
@@ -0,0 +1,21 @@
+import os
+import requests
+out = os.environ['out']
+url = os.environ['url']
+headers = {"User-Agent": "nix-fetchurl"}
+header_names = os.environ.get("headerNames", "")
+for name in header_names.split():
+    if "__HTTP_HEADER_{}".format(name) not in os.environ:
+        exit("FATAL: no corresponding value set for header {}"
+             .format(name))
+    headers[name] = os.environ["__HTTP_HEADER_{}".format(name)]
+print('GET {} with headers {}'.format(url, headers))
+response = requests.get(url, headers=headers)
+if response.status_code != 200:
+    exit("Received a {} response. :(\nContent: {}"
+         .format(response.status_code, response.content))
+else:
+    print('Response: {} ({} bytes)'
+          .format(response.status_code, len(response.content)))
+with open(out, 'wb') as f:
+    f.write(response.content)
diff --git a/npm/nodeLib/fetchUrlWithHeaders.nix b/npm/nodeLib/fetchUrlWithHeaders.nix
new file mode 100644
index 0000000..aba3bd9
--- /dev/null
+++ b/npm/nodeLib/fetchUrlWithHeaders.nix
@@ -0,0 +1,71 @@
+# A python-based fetchurl function, allowing the passage of custom headers.
+# Just calls into `requests` under the hood.
+{
+  pythonPackages, stdenv
+}:
+
+
+{ # URL to fetch.
+  url ? ""
+
+, # Additional curl options needed for the download to succeed.
+  curlOpts ? ""
+
+, # Name of the file.  If empty, use the basename of `url' (or of the
+  # first element of `urls').
+  name ? ""
+
+  # Different ways of specifying the hash.
+, outputHash ? ""
+, outputHashAlgo ? ""
+, md5 ? ""
+, sha1 ? ""
+, sha256 ? ""
+
+, # Meta information, if any.
+  meta ? {}
+
+  # Headers to set, if any.
+, headers ? {}
+}:
+
+let
+  inherit (stdenv.lib) flip mapAttrs' nameValuePair;
+  hasHash = (outputHash != "" && outputHashAlgo != "")
+            || md5 != "" || sha1 != "" || sha256 != "";
+
+  # Create an attribute set translating each header name and value into
+  # the header name prefixed with __HTTP_HEADER. When the derivation is
+  # evaluated, the script will pick up these environment variables and use
+  # them to produce the actual headers.
+  headerValues = flip mapAttrs' headers (headerName: headerValue:
+    nameValuePair "__HTTP_HEADER_${headerName}" headerValue);
+in
+
+if !hasHash
+then throw "You must specify the output hash for ${url}"
+else
+
+stdenv.mkDerivation ({
+  inherit url;
+  name = if name != "" then name else baseNameOf (toString url);
+
+  outputHashAlgo = if outputHashAlgo != "" then outputHashAlgo else
+      if sha256 != "" then "sha256" else if sha1 != "" then "sha1" else "md5";
+  outputHash = if outputHash != "" then outputHash else
+      if sha256 != "" then sha256 else if sha1 != "" then sha1 else md5;
+
+  # Only flat hashing, which is the normal mode if you're fetching a file.
+  outputHashMode = "flat";
+
+  # Doing the download on a remote machine just duplicates network
+  # traffic, so don't do that.
+  preferLocalBuild = true;
+
+  headerNames = builtins.attrNames headers;
+
+  buildInputs = with pythonPackages; [python requests2];
+  buildCommand = ''
+    python ${./fetch.py}
+  '';
+} // headerValues)
diff --git a/npm/nodeLib/parseNpmAuthTokens.nix b/npm/nodeLib/parseNpmAuthTokens.nix
new file mode 100644
index 0000000..3b6dcb9
--- /dev/null
+++ b/npm/nodeLib/parseNpmAuthTokens.nix
@@ -0,0 +1,16 @@
+# Parses the `NPM_AUTH_TOKENS` environment variable to discover
+# namespace-token associations and turn them into an attribute set
+# which we can use as an input to the fetchPrivateNpm function.
+{pkgs, joinSets}:
+
+let
+  inherit (pkgs.lib) flip length elemAt;
+  npmAuthTokens = builtins.getEnv "NPM_AUTH_TOKENS";
+in
+
+# Split the variable on ':', then turn each k=v element in
+# the list into an attribute set and join all of those sets.
+joinSets (
+  flip map (split ":" npmAuthTokens) (kvPair:
+    if length (split "=" kvPair) != 2 then {}
+    else {"${elemAt kvPair 0}" = elemAt kvPair 1;}))
diff --git a/npm/nodeLib/removeImpureDependencies.js b/npm/nodeLib/removeImpureDependencies.js
new file mode 100644
index 0000000..e74dfb9
--- /dev/null
+++ b/npm/nodeLib/removeImpureDependencies.js
@@ -0,0 +1,46 @@
+// These packages come packaged with nodejs.
+var fs = require('fs');
+var url = require('url');
+
+function versionSpecIsImpure(versionSpec) {
+  // Returns true if a version spec is impure.
+  return (versionSpec == "latest" || versionSpec == "unstable" ||
+          // file path references
+          versionSpec.substr(0, 2) == ".." ||
+          versionSpec.substr(0, 2) == "./" ||
+          versionSpec.substr(0, 2) == "~/" ||
+          versionSpec.substr(0, 1) == '/' ||
+          // github owner/repo references
+          /^[^/]+\/[^/]+(#.*)?$/.test(versionSpec) ||
+          // is a URL
+          url.parse(versionSpec).protocol);
+}
+
+// Load up the package object.
+var packageObj = JSON.parse(fs.readFileSync('./package.json'));
+
+// Purify dependencies.
+var depTypes = ['dependencies', 'devDependencies', 'optionalDependencies'];
+for (var i in depTypes) {
+  var depType = depTypes[i];
+  var depSet = packageObj[depType];
+  if (depSet !== undefined) {
+    for (var depName in depSet) {
+      if (versionSpecIsImpure(depSet[depName])) {
+        depSet[depName] = '*';
+      }
+    }
+  }
+}
+
+/* Remove peer dependencies */
+if (process.env.removePeerDependencies && packageObj.peerDependencies) {
+  console.log("WARNING: removing the following peer dependencies:");
+  for (key in packageObj.peerDependencies) {
+    console.log("  " + key + ": " + packageObj.peerDependencies[key]);
+  }
+  delete packageObj.peerDependencies;
+}
+
+/* Write the fixed JSON file */
+fs.writeFileSync("package.json", JSON.stringify(packageObj));
diff --git a/npm/nodePackages/asn1/0.2.3.nix b/npm/nodePackages/asn1/0.2.3.nix
new file mode 100644
index 0000000..7eabb05
--- /dev/null
+++ b/npm/nodePackages/asn1/0.2.3.nix
@@ -0,0 +1,14 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "asn1";
+    version = "0.2.3";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz";
+      sha1 = "dac8787713c9966849fc8180777ebe9c1ddf3b86";
+    };
+    deps = [];
+    meta = {
+      homepage = "https://github.com/mcavage/node-asn1";
+      description = "Contains parsers and serializers for ASN.1 (currently BER only)";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/asn1/latest.nix b/npm/nodePackages/asn1/latest.nix
new file mode 120000
index 0000000..f45e5cd
--- /dev/null
+++ b/npm/nodePackages/asn1/latest.nix
@@ -0,0 +1 @@
+0.2.3.nix
\ No newline at end of file
diff --git a/npm/nodePackages/assert-plus/0.1.5.nix b/npm/nodePackages/assert-plus/0.1.5.nix
new file mode 100644
index 0000000..bafce52
--- /dev/null
+++ b/npm/nodePackages/assert-plus/0.1.5.nix
@@ -0,0 +1,14 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "assert-plus";
+    version = "0.1.5";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/assert-plus/-/assert-plus-0.1.5.tgz";
+      sha1 = "ee74009413002d84cec7219c6ac811812e723160";
+    };
+    deps = [];
+    devDependencies = [];
+    meta = {
+      description = "Extra assertions on top of node's assert module";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/assert-plus/latest.nix b/npm/nodePackages/assert-plus/latest.nix
new file mode 120000
index 0000000..cb46933
--- /dev/null
+++ b/npm/nodePackages/assert-plus/latest.nix
@@ -0,0 +1 @@
+0.1.5.nix
\ No newline at end of file
diff --git a/npm/nodePackages/backoff/2.4.1.nix b/npm/nodePackages/backoff/2.4.1.nix
new file mode 100644
index 0000000..912e1ab
--- /dev/null
+++ b/npm/nodePackages/backoff/2.4.1.nix
@@ -0,0 +1,21 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "backoff";
+    version = "2.4.1";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/backoff/-/backoff-2.4.1.tgz";
+      sha1 = "2f68c50e0dd789dbefe24200a62efb04d2456d68";
+    };
+    deps = with nodePackages; [
+      precond_0-2-3
+    ];
+    meta = {
+      description = "Fibonacci and exponential backoffs.";
+      keywords = [
+        "backoff"
+        "retry"
+        "fibonacci"
+        "exponential"
+      ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/backoff/latest.nix b/npm/nodePackages/backoff/latest.nix
new file mode 120000
index 0000000..7c5c693
--- /dev/null
+++ b/npm/nodePackages/backoff/latest.nix
@@ -0,0 +1 @@
+2.4.1.nix
\ No newline at end of file
diff --git a/npm/nodePackages/bunyan/1.5.1.nix b/npm/nodePackages/bunyan/1.5.1.nix
new file mode 100644
index 0000000..1d79841
--- /dev/null
+++ b/npm/nodePackages/bunyan/1.5.1.nix
@@ -0,0 +1,30 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "bunyan";
+    version = "1.5.1";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/bunyan/-/bunyan-1.5.1.tgz";
+      sha1 = "5f6e7d44c43b952f56b0f41309e3ab12391b4e2d";
+    };
+    deps = with nodePackages; [
+      dtrace-provider_0-6-0
+      safe-json-stringify_1-0-3
+      mv_2-0-3
+    ];
+    optionalDependencies = with nodePackages; [
+      dtrace-provider_0-6-0
+      safe-json-stringify_1-0-3
+      mv_2-0-3
+    ];
+    meta = {
+      homepage = "https://github.com/trentm/node-bunyan";
+      description = "a JSON logging library for node.js services";
+      keywords = [
+        "log"
+        "logging"
+        "log4j"
+        "json"
+        "bunyan"
+      ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/bunyan/latest.nix b/npm/nodePackages/bunyan/latest.nix
new file mode 120000
index 0000000..a69ad5e
--- /dev/null
+++ b/npm/nodePackages/bunyan/latest.nix
@@ -0,0 +1 @@
+1.5.1.nix
\ No newline at end of file
diff --git a/npm/nodePackages/dashdash/1.10.1.nix b/npm/nodePackages/dashdash/1.10.1.nix
new file mode 100644
index 0000000..d5048e8
--- /dev/null
+++ b/npm/nodePackages/dashdash/1.10.1.nix
@@ -0,0 +1,24 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "dashdash";
+    version = "1.10.1";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/dashdash/-/dashdash-1.10.1.tgz";
+      sha1 = "0abf1af89a8f5129a81f18c2b35b21df22622f60";
+    };
+    deps = with nodePackages; [
+      assert-plus_0-1-5
+    ];
+    meta = {
+      homepage = "https://github.com/trentm/node-dashdash";
+      description = "A light, featureful and explicit option parsing library.";
+      keywords = [
+        "option"
+        "parser"
+        "parsing"
+        "cli"
+        "command"
+        "args"
+      ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/dashdash/latest.nix b/npm/nodePackages/dashdash/latest.nix
new file mode 120000
index 0000000..a05fdfc
--- /dev/null
+++ b/npm/nodePackages/dashdash/latest.nix
@@ -0,0 +1 @@
+1.10.1.nix
\ No newline at end of file
diff --git a/npm/nodePackages/dtrace-provider/0.6.0.nix b/npm/nodePackages/dtrace-provider/0.6.0.nix
new file mode 100644
index 0000000..eb7b6e2
--- /dev/null
+++ b/npm/nodePackages/dtrace-provider/0.6.0.nix
@@ -0,0 +1,17 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "dtrace-provider";
+    version = "0.6.0";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/dtrace-provider/-/dtrace-provider-0.6.0.tgz";
+      sha1 = "0b078d5517937d873101452d9146737557b75e51";
+    };
+    deps = with nodePackages; [
+      nan_2-1-0
+    ];
+    meta = {
+      homepage = "https://github.com/chrisa/node-dtrace-provider#readme";
+      description = "Native DTrace providers for node.js applications";
+      keywords = [ "dtrace" ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/dtrace-provider/latest.nix b/npm/nodePackages/dtrace-provider/latest.nix
new file mode 120000
index 0000000..6f25937
--- /dev/null
+++ b/npm/nodePackages/dtrace-provider/latest.nix
@@ -0,0 +1 @@
+0.6.0.nix
\ No newline at end of file
diff --git a/npm/nodePackages/extsprintf/1.2.0.nix b/npm/nodePackages/extsprintf/1.2.0.nix
new file mode 100644
index 0000000..e9ea512
--- /dev/null
+++ b/npm/nodePackages/extsprintf/1.2.0.nix
@@ -0,0 +1,15 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "extsprintf";
+    version = "1.2.0";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/extsprintf/-/extsprintf-1.2.0.tgz";
+      sha1 = "5ad946c22f5b32ba7f8cd7426711c6e8a3fc2529";
+    };
+    deps = [];
+    devDependencies = [];
+    meta = {
+      homepage = "https://github.com/davepacheco/node-extsprintf";
+      description = "extended POSIX-style sprintf";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/extsprintf/latest.nix b/npm/nodePackages/extsprintf/latest.nix
new file mode 120000
index 0000000..4919f5b
--- /dev/null
+++ b/npm/nodePackages/extsprintf/latest.nix
@@ -0,0 +1 @@
+1.2.0.nix
\ No newline at end of file
diff --git a/npm/nodePackages/ldap-filter/0.2.2.nix b/npm/nodePackages/ldap-filter/0.2.2.nix
new file mode 100644
index 0000000..de3168b
--- /dev/null
+++ b/npm/nodePackages/ldap-filter/0.2.2.nix
@@ -0,0 +1,16 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "ldap-filter";
+    version = "0.2.2";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/ldap-filter/-/ldap-filter-0.2.2.tgz";
+      sha1 = "f2b842be0b86da3352798505b31ebcae590d77d0";
+    };
+    deps = with nodePackages; [
+      assert-plus_0-1-5
+    ];
+    meta = {
+      homepage = "http://ldapjs.org";
+      description = "API for handling LDAP-style filters";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/ldap-filter/latest.nix b/npm/nodePackages/ldap-filter/latest.nix
new file mode 120000
index 0000000..5382e84
--- /dev/null
+++ b/npm/nodePackages/ldap-filter/latest.nix
@@ -0,0 +1 @@
+0.2.2.nix
\ No newline at end of file
diff --git a/npm/nodePackages/ldapjs/1.0.0.nix b/npm/nodePackages/ldapjs/1.0.0.nix
new file mode 100644
index 0000000..ff69ade
--- /dev/null
+++ b/npm/nodePackages/ldapjs/1.0.0.nix
@@ -0,0 +1,28 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "ldapjs";
+    version = "1.0.0";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/ldapjs/-/ldapjs-1.0.0.tgz";
+      sha1 = "1da2cd5bfb9cb103c1ba516938da971bc2bbc3f2";
+    };
+    deps = with nodePackages; [
+      ldap-filter_0-2-2
+      asn1_0-2-3
+      bunyan_1-5-1
+      once_1-3-2
+      vasync_1-6-3
+      dtrace-provider_0-6-0
+      backoff_2-4-1
+      assert-plus_0-1-5
+      verror_1-6-0
+      dashdash_1-10-1
+    ];
+    optionalDependencies = with nodePackages; [
+      dtrace-provider_0-6-0
+    ];
+    meta = {
+      homepage = "http://ldapjs.org";
+      description = "LDAP client and server APIs";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/ldapjs/latest.nix b/npm/nodePackages/ldapjs/latest.nix
new file mode 120000
index 0000000..16c2c64
--- /dev/null
+++ b/npm/nodePackages/ldapjs/latest.nix
@@ -0,0 +1 @@
+1.0.0.nix
\ No newline at end of file
diff --git a/npm/nodePackages/minimist/0.0.8.nix b/npm/nodePackages/minimist/0.0.8.nix
new file mode 100644
index 0000000..7cf6c6d
--- /dev/null
+++ b/npm/nodePackages/minimist/0.0.8.nix
@@ -0,0 +1,20 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "minimist";
+    version = "0.0.8";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz";
+      sha1 = "857fcabfc3397d2625b8228262e86aa7a011b05d";
+    };
+    deps = [];
+    meta = {
+      homepage = "https://github.com/substack/minimist";
+      description = "parse argument options";
+      keywords = [
+        "argv"
+        "getopt"
+        "parser"
+        "optimist"
+      ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/minimist/latest.nix b/npm/nodePackages/minimist/latest.nix
new file mode 120000
index 0000000..65c0a0d
--- /dev/null
+++ b/npm/nodePackages/minimist/latest.nix
@@ -0,0 +1 @@
+0.0.8.nix
\ No newline at end of file
diff --git a/npm/nodePackages/mkdirp/0.5.1.nix b/npm/nodePackages/mkdirp/0.5.1.nix
new file mode 100644
index 0000000..e0a9858
--- /dev/null
+++ b/npm/nodePackages/mkdirp/0.5.1.nix
@@ -0,0 +1,20 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "mkdirp";
+    version = "0.5.1";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz";
+      sha1 = "30057438eac6cf7f8c4767f38648d6697d75c903";
+    };
+    deps = with nodePackages; [
+      minimist_0-0-8
+    ];
+    meta = {
+      homepage = "https://github.com/substack/node-mkdirp#readme";
+      description = "Recursively mkdir, like `mkdir -p`";
+      keywords = [
+        "mkdir"
+        "directory"
+      ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/mkdirp/latest.nix b/npm/nodePackages/mkdirp/latest.nix
new file mode 120000
index 0000000..2dc7af4
--- /dev/null
+++ b/npm/nodePackages/mkdirp/latest.nix
@@ -0,0 +1 @@
+0.5.1.nix
\ No newline at end of file
diff --git a/npm/nodePackages/mv/2.0.3.nix b/npm/nodePackages/mv/2.0.3.nix
new file mode 100644
index 0000000..4115817
--- /dev/null
+++ b/npm/nodePackages/mv/2.0.3.nix
@@ -0,0 +1,26 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "mv";
+    version = "2.0.3";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/mv/-/mv-2.0.3.tgz";
+      sha1 = "e9ab707d71dc38de24edcc637a8e2f5f480c7f32";
+    };
+    deps = with nodePackages; [
+      ncp_0-6-0
+      mkdirp_0-5-1
+      rimraf_2-2-8
+    ];
+    meta = {
+      homepage = "https://github.com/andrewrk/node-mv";
+      description = "fs.rename but works across devices. same as the unix utility 'mv'";
+      keywords = [
+        "mv"
+        "move"
+        "rename"
+        "device"
+        "recursive"
+        "folder"
+      ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/mv/latest.nix b/npm/nodePackages/mv/latest.nix
new file mode 120000
index 0000000..351e4a9
--- /dev/null
+++ b/npm/nodePackages/mv/latest.nix
@@ -0,0 +1 @@
+2.0.3.nix
\ No newline at end of file
diff --git a/npm/nodePackages/nan/2.1.0.nix b/npm/nodePackages/nan/2.1.0.nix
new file mode 100644
index 0000000..149cb04
--- /dev/null
+++ b/npm/nodePackages/nan/2.1.0.nix
@@ -0,0 +1,14 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "nan";
+    version = "2.1.0";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/nan/-/nan-2.1.0.tgz";
+      sha1 = "020a7ccedc63fdee85f85967d5607849e74abbe8";
+    };
+    deps = [];
+    meta = {
+      homepage = "https://github.com/nodejs/nan#readme";
+      description = "Native Abstractions for Node.js: C++ header for Node 0.8 -> 4 compatibility";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/nan/latest.nix b/npm/nodePackages/nan/latest.nix
new file mode 120000
index 0000000..01844ff
--- /dev/null
+++ b/npm/nodePackages/nan/latest.nix
@@ -0,0 +1 @@
+2.1.0.nix
\ No newline at end of file
diff --git a/npm/nodePackages/ncp/0.6.0.nix b/npm/nodePackages/ncp/0.6.0.nix
new file mode 100644
index 0000000..860db9d
--- /dev/null
+++ b/npm/nodePackages/ncp/0.6.0.nix
@@ -0,0 +1,15 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "ncp";
+    version = "0.6.0";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/ncp/-/ncp-0.6.0.tgz";
+      sha1 = "df8ce021e262be21b52feb3d3e5cfaab12491f0d";
+    };
+    deps = [];
+    meta = {
+      homepage = "https://github.com/AvianFlu/ncp";
+      description = "Asynchronous recursive file copy utility.";
+      keywords = [ "cli" "copy" ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/ncp/latest.nix b/npm/nodePackages/ncp/latest.nix
new file mode 120000
index 0000000..6f25937
--- /dev/null
+++ b/npm/nodePackages/ncp/latest.nix
@@ -0,0 +1 @@
+0.6.0.nix
\ No newline at end of file
diff --git a/npm/nodePackages/once/1.3.2.nix b/npm/nodePackages/once/1.3.2.nix
new file mode 100644
index 0000000..2b3b81f
--- /dev/null
+++ b/npm/nodePackages/once/1.3.2.nix
@@ -0,0 +1,22 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "once";
+    version = "1.3.2";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/once/-/once-1.3.2.tgz";
+      sha1 = "d8feeca93b039ec1dcdee7741c92bdac5e28081b";
+    };
+    deps = with nodePackages; [
+      wrappy_1-0-1
+    ];
+    meta = {
+      homepage = "https://github.com/isaacs/once#readme";
+      description = "Run a function exactly one time";
+      keywords = [
+        "once"
+        "function"
+        "one"
+        "single"
+      ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/once/latest.nix b/npm/nodePackages/once/latest.nix
new file mode 120000
index 0000000..ea38782
--- /dev/null
+++ b/npm/nodePackages/once/latest.nix
@@ -0,0 +1 @@
+1.3.2.nix
\ No newline at end of file
diff --git a/npm/nodePackages/precond/0.2.3.nix b/npm/nodePackages/precond/0.2.3.nix
new file mode 100644
index 0000000..f76d2b5
--- /dev/null
+++ b/npm/nodePackages/precond/0.2.3.nix
@@ -0,0 +1,20 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "precond";
+    version = "0.2.3";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/precond/-/precond-0.2.3.tgz";
+      sha1 = "aa9591bcaa24923f1e0f4849d240f47efc1075ac";
+    };
+    deps = [];
+    meta = {
+      description = "Precondition checking utilities.";
+      keywords = [
+        "precondition"
+        "assert"
+        "invariant"
+        "contract"
+        "condition"
+      ];
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/precond/latest.nix b/npm/nodePackages/precond/latest.nix
new file mode 120000
index 0000000..f45e5cd
--- /dev/null
+++ b/npm/nodePackages/precond/latest.nix
@@ -0,0 +1 @@
+0.2.3.nix
\ No newline at end of file
diff --git a/npm/nodePackages/rimraf/2.2.8.nix b/npm/nodePackages/rimraf/2.2.8.nix
new file mode 100644
index 0000000..73a31cb
--- /dev/null
+++ b/npm/nodePackages/rimraf/2.2.8.nix
@@ -0,0 +1,15 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "rimraf";
+    version = "2.2.8";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/rimraf/-/rimraf-2.2.8.tgz";
+      sha1 = "e439be2aaee327321952730f99a8929e4fc50582";
+    };
+    deps = [];
+    devDependencies = [];
+    meta = {
+      homepage = "https://github.com/isaacs/rimraf";
+      description = "A deep deletion module for node (like `rm -rf`)";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/rimraf/latest.nix b/npm/nodePackages/rimraf/latest.nix
new file mode 120000
index 0000000..6f9b4c5
--- /dev/null
+++ b/npm/nodePackages/rimraf/latest.nix
@@ -0,0 +1 @@
+2.2.8.nix
\ No newline at end of file
diff --git a/npm/nodePackages/safe-json-stringify/1.0.3.nix b/npm/nodePackages/safe-json-stringify/1.0.3.nix
new file mode 100644
index 0000000..3ad5dd8
--- /dev/null
+++ b/npm/nodePackages/safe-json-stringify/1.0.3.nix
@@ -0,0 +1,14 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "safe-json-stringify";
+    version = "1.0.3";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/safe-json-stringify/-/safe-json-stringify-1.0.3.tgz";
+      sha1 = "3cb6717660a086d07cb5bd9b7a6875bcf67bd05e";
+    };
+    deps = [];
+    meta = {
+      homepage = "https://github.com/e-conomic/safe-json-stringify";
+      description = "Prevent defined property getters from throwing errors";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/safe-json-stringify/latest.nix b/npm/nodePackages/safe-json-stringify/latest.nix
new file mode 120000
index 0000000..c56a352
--- /dev/null
+++ b/npm/nodePackages/safe-json-stringify/latest.nix
@@ -0,0 +1 @@
+1.0.3.nix
\ No newline at end of file
diff --git a/npm/nodePackages/vasync/1.6.3.nix b/npm/nodePackages/vasync/1.6.3.nix
new file mode 100644
index 0000000..9c4c997
--- /dev/null
+++ b/npm/nodePackages/vasync/1.6.3.nix
@@ -0,0 +1,16 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "vasync";
+    version = "1.6.3";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/vasync/-/vasync-1.6.3.tgz";
+      sha1 = "4a69d7052a47f4ce85503d7641df1cbf40432a94";
+    };
+    deps = with nodePackages; [
+      verror_1-6-0
+    ];
+    meta = {
+      homepage = "https://github.com/davepacheco/node-vasync";
+      description = "utilities for observable asynchronous control flow";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/vasync/latest.nix b/npm/nodePackages/vasync/latest.nix
new file mode 120000
index 0000000..5e092a9
--- /dev/null
+++ b/npm/nodePackages/vasync/latest.nix
@@ -0,0 +1 @@
+1.6.3.nix
\ No newline at end of file
diff --git a/npm/nodePackages/verror/1.6.0.nix b/npm/nodePackages/verror/1.6.0.nix
new file mode 100644
index 0000000..0fb9c67
--- /dev/null
+++ b/npm/nodePackages/verror/1.6.0.nix
@@ -0,0 +1,17 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "verror";
+    version = "1.6.0";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/verror/-/verror-1.6.0.tgz";
+      sha1 = "7d13b27b1facc2e2da90405eb5ea6e5bdd252ea5";
+    };
+    deps = with nodePackages; [
+      extsprintf_1-2-0
+    ];
+    devDependencies = [];
+    meta = {
+      homepage = "https://github.com/davepacheco/node-verror";
+      description = "richer JavaScript errors";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/verror/latest.nix b/npm/nodePackages/verror/latest.nix
new file mode 120000
index 0000000..855cd09
--- /dev/null
+++ b/npm/nodePackages/verror/latest.nix
@@ -0,0 +1 @@
+1.6.0.nix
\ No newline at end of file
diff --git a/npm/nodePackages/wrappy/1.0.1.nix b/npm/nodePackages/wrappy/1.0.1.nix
new file mode 100644
index 0000000..e6414a2
--- /dev/null
+++ b/npm/nodePackages/wrappy/1.0.1.nix
@@ -0,0 +1,14 @@
+{ buildNodePackage, nodePackages, pkgs }:
+buildNodePackage {
+    name = "wrappy";
+    version = "1.0.1";
+    src = pkgs.fetchurl {
+      url = "http://registry.npmjs.org/wrappy/-/wrappy-1.0.1.tgz";
+      sha1 = "1e65969965ccbc2db4548c6b84a6f2c5aedd4739";
+    };
+    deps = [];
+    meta = {
+      homepage = "https://github.com/npm/wrappy";
+      description = "Callback wrapping utility";
+    };
+  }
\ No newline at end of file
diff --git a/npm/nodePackages/wrappy/latest.nix b/npm/nodePackages/wrappy/latest.nix
new file mode 120000
index 0000000..b9f08ee
--- /dev/null
+++ b/npm/nodePackages/wrappy/latest.nix
@@ -0,0 +1 @@
+1.0.1.nix
\ No newline at end of file
diff --git a/ldap-client.nix b/package.nix
similarity index 100%
rename from ldap-client.nix
rename to package.nix
diff --git a/shell.nix b/shell.nix
index a611bd7..29656cc 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,17 +1,17 @@
-{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7101" }: let
+{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc7102" }: let
   inherit (nixpkgs) pkgs;
-  ghc = pkgs.haskell.packages.${compiler}.ghcWithPackages( ps: with ps; [
-    hdevtools doctest
+  ghc = pkgs.haskell.packages.${compiler}.ghcWithPackages(ps: [
+    ps.hdevtools ps.doctest ps.hspec-discover ps.hlint ps.ghc-mod
   ]);
   cabal-install = pkgs.haskell.packages.${compiler}.cabal-install;
-  pkg = (import ./default.nix { inherit nixpkgs compiler; });
+  pkg = import ./default.nix { inherit nixpkgs compiler; };
+  npm = import ./npm {};
 in
   pkgs.stdenv.mkDerivation rec {
     name = pkg.pname;
-    buildInputs = [ ghc cabal-install ] ++ pkg.env.buildInputs;
+    buildInputs = [ ghc cabal-install npm.nodePackages.ldapjs ] ++ pkg.env.buildInputs;
     shellHook = ''
       ${pkg.env.shellHook}
-      export IN_WHICH_NIX_SHELL=${name}
-      cabal configure --package-db=$NIX_GHC_LIBDIR/package.conf.d
+      cabal configure --enable-tests --package-db=$NIX_GHC_LIBDIR/package.conf.d
     '';
   }
diff --git a/test/Ldap/Client/CompareSpec.hs b/test/Ldap/Client/CompareSpec.hs
index ed1e93f..3383c90 100644
--- a/test/Ldap/Client/CompareSpec.hs
+++ b/test/Ldap/Client/CompareSpec.hs
@@ -16,7 +16,7 @@ spec = do
       res `shouldBe` True
     res `shouldBe` Right ()
 
-  it "compares and looses" $ do
+  it "compares and loses" $ do
     res <- locally $ \l -> do
       res <- Ldap.compare l charmander (Attr "type") "flying"
       res `shouldBe` False
diff --git a/test/SpecHelper.hs b/test/SpecHelper.hs
index f0de15a..60d4b75 100644
--- a/test/SpecHelper.hs
+++ b/test/SpecHelper.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 module SpecHelper
   ( locally
@@ -22,8 +23,15 @@ module SpecHelper
   , oddish
   ) where
 
+#if __GLASGOW_HASKELL__ < 710
+import Control.Applicative ((<$))
+#endif
+import Control.Monad (forever)
+import Control.Concurrent (forkIO)
 import Control.Exception (bracket)
+import System.Environment (getEnvironment)
 import System.IO (hGetLine)
+import System.IO.Error (tryIOError)
 import System.Process (runInteractiveProcess, terminateProcess, waitForProcess)
 
 import Ldap.Client as Ldap
@@ -31,12 +39,14 @@ import Ldap.Client as Ldap
 
 locally :: (Ldap -> IO a) -> IO (Either LdapError a)
 locally f =
-  bracket (do (_, out, _, h) <- runInteractiveProcess "./test/ldap.js" [] Nothing
-                                  (Just [ ("PORT", show port)
-                                        , ("SSL_CERT", "./ssl/cert.pem")
-                                        , ("SSL_KEY", "./ssl/key.pem")
-                                        ])
+  bracket (do env <- getEnvironment
+              (_, out, _, h) <- runInteractiveProcess "./test/ldap.js" [] Nothing
+                                  (Just (("PORT", show port) :
+                                         ("SSL_CERT", "./ssl/cert.pem") :
+                                         ("SSL_KEY", "./ssl/key.pem") :
+                                         env))
               hGetLine out
+              forkIO (() <$ tryIOError (forever (hGetLine out >>= putStrLn)))
               return h)
           (\h -> do terminateProcess h
                     waitForProcess h)
diff --git a/test/ldap.js b/test/ldap.js
index 5a13702..1b519c0 100755
--- a/test/ldap.js
+++ b/test/ldap.js
@@ -1,8 +1,20 @@
-#!/usr/bin/env js
+#!/usr/bin/env node
 
 var fs = require('fs');
 var ldapjs = require('ldapjs');
 
+// Stub unimplemented functionality.
+ldapjs.ExtensibleFilter.prototype.matches = ldapjs.EqualityFilter.prototype.matches;
+ldapjs.ApproximateFilter.prototype.matches = ldapjs.EqualityFilter.prototype.matches;
+
+// Remove superfluous spaces from DNs.
+var wrappee = ldapjs.DN.prototype.format;
+ldapjs.DN.prototype.format = function(options) {
+  options = options || this._format;
+  options['skipSpace'] = true;
+  return (wrappee.bind(this))(options);
+};
+
 var port = process.env.PORT;
 var certificate = fs.readFileSync(process.env.SSL_CERT, "utf-8");
 var key = fs.readFileSync(process.env.SSL_KEY, "utf-8");
@@ -81,8 +93,9 @@ function authorize(req, res, next) {
 
 server.search('o=localhost', [authorize], function(req, res, next) {
   for (var i = 0; i < pokemon.length; i++) {
-    if (req.filter.matches(pokemon[i].attributes))
+    if (req.filter.matches(pokemon[i].attributes)) {
       res.send(pokemon[i]);
+    }
   };
 
   res.end();
@@ -163,7 +176,7 @@ server.modifyDN('o=localhost', [], function(req, res, next) {
     if (req.dn.toString() === pokemon[i].dn) {
       req.dn.rdns[0] = req.newRdn.rdns[0];
       pokemon[i].dn = req.dn.toString();
-      pokemon[i].attributes.cn = req.newRdn.rdns[0].cn;
+      pokemon[i].attributes.cn = req.newRdn.rdns[0].attrs.cn.value;
     }
   }