diff --git a/.gitignore b/.gitignore
index 5a8c9b2..5cbb075 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,11 @@
 cameras.sql
+.DS_Store
 .project
 .settings
 *.swp
 node_modules
 prep.config
+settings-nvr-local.js
 target
 ui-dist
 yarn-error.log
diff --git a/README.md b/README.md
index 65405fe..7a25ecd 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ make this possible:
 
 *   [License](LICENSE.txt) — GPLv3
 *   [Building and installing](guide/install.md)
+*   [UI Development](guide/developing-ui.md)
 *   [Troubleshooting](guide/troubleshooting.md)
 
 # <a name="help"></a> Getting help and getting involved
diff --git a/guide/developing-ui.md b/guide/developing-ui.md
new file mode 100644
index 0000000..c9d5d67
--- /dev/null
+++ b/guide/developing-ui.md
@@ -0,0 +1,146 @@
+# Working on UI development
+
+The UI is presented from a single HTML page (index.html) and any number
+of Javascript files, css files, images, etc. These are "packed" together
+using [webpack](https://webpack.js.org).
+
+For ongoing development it is possible to have the UI running in a web
+browser using "hot loading". This means that as you make changes to source
+files, they will be detected, the webpack will be recompiled and generated
+and then the browser will be informed to reload things. In combination with
+the debugger built into modern browsers this makes for a reasonable process.
+
+For a production build, the same process is followed, except with different
+settings. In particular, no hot loading development server will be started
+and more effort is expended on packing and minimizing the components of
+the application as represented in the various "bundles". Read more about
+this in the webpack documentation.
+
+## Getting started
+
+Checkout the branch you want to work on and type
+
+    $ yarn start
+
+This will pack and prepare a development setup. By default the development
+server that serves up the web page(s) will listen on
+[http://localhost:3000](http://localhost:3000) so you can direct your browser
+there.
+
+Make any changes to the source code as you desire (look at existing code
+for examples and typical style), and the browser will hot-load your changes.
+Often times you will make mistakes. Anything from a coding error (for which
+you can use the browser's debugger), or compilation breaking Javascript errors.
+The latter will often be reported as errors during the webpack assembly
+process, but some will show up in the browser console, or both.
+
+## Control and location of settings
+
+Much of the settings needed to put the UI together, run webpack etc. is
+located in a series of files that contain webpack configuration. These
+files all live in the "webpack" subdirectory. We will not explain all
+of them here, as you should rarely need to understand them, let alone
+modify them.
+
+What is worth mentioning is that the `package.json` file is configured
+to use a different webpack configuration for development vs. production
+builds. Both configurations depend on a shared configuration common to
+both.
+
+There are also some settings that control aspects of the MoonFire UI
+behavior, such as window titles etc. These settings are found in the
+`settings-nvr.js` file in the project root directory. They should be
+pretty self explanatory.
+
+The webpack configuration for all webpack builds is able to load the
+values from `settings-nvr.js` and then, if the file exists, load those
+from `settings-nvr-local.js` and use them to add to the configuration,
+or replace. You can take advantage of this to add your own configuration
+values in the "local" file, which does not get checked in, but is used
+to affect development, and production builds.
+
+## Special considerations for API calls
+
+The UI code will make calls to the MoonFire NVR's server API, which is
+assumed to run on the same host as the MoonFire server. This makes sense
+because that server is also normally the one serving up the UI. For UI 
+development, however this is not always convenient, or even useful.
+
+For one, you may be doing this development on a machine other than where
+the main MoonFire server is running. That can work, but of course that
+machine will not be responding the the API calls. If the UI does not
+gracefully handle API failure errors (it should but development on that
+is ongoing), it may break your UI code.
+
+Therefore, for practical purposes, you may want the API calls to go to
+a different server than where the localhost is. Rather than editing the
+`webpack/dev.conf.js` file to make this happen, you should use a different
+mechanism. The reason for not modifying this file (unless the change is
+needed by all), is that the file is under source control and thus should
+not reflect settings that are just for your personal use.
+
+The manner in which you can achieve using a different server for API
+calls is by telling the development server to use a "proxy" for
+certain urls. All API calls start with "/api", so we'll take advantage
+of that. Create a the file `settings-nvr-local.js` right next to the standard
+`settings-nvr.js`. The file should look something like this:
+
+    module.exports.settings = {
+      devServer: {
+        proxy: {
+          '/api': 'http://192.168.1.232:8080'
+        }
+      }
+    };
+
+This tells the development server to proxy all urls that it encounters
+requests for to the url specified. The way this is done is by taking the
+full URI component for the original request, and appending it to the string
+configured on the right side of the path to be rewritten above. In a standard
+MoonFire install, the server (and thus the API server as well), will be
+listening on port 8080 a the IP address where the server lives. So adjust
+the above for reach your own MoonFire instance where there is a server
+running with some real data behind it.
+
+### Issues with "older" MoonFire builds
+
+You might also have though to change the "/api" string in the source code
+to include the IP address of the MoonFire server. This would use the
+"right" (desirable) URLs, but the requests will fail due to a violation
+of the Cross-Origin Resource Sharing (CORS) protocol. If you really
+need to, you can add a configuration option to the MoonFire server
+by modifying its "service definition". We will not explain here how.
+
+## Changing development server configuration
+
+You can find our standard configuration for the development server inside
+the `webpacks/dev.conf.js` file. Using the technique outlined above you
+can change ports, ip addresses etc. One example where this may come in
+useful is that you may want to "test" your new API code, running on
+machine "A" (from a development server), proxying API requests to machine
+"B" (because it has real data), from a browser running on machine "C".
+
+The development server normally is configured to listing on port 3000
+on "localhost." (which would correspond to machine "A" in this example).
+However, you cannot use "localhost" on another machine to refer to "A".
+You may think that using the IP address of "A" works, but it doesn't
+because "localhost" lives at an IP address local to machine "A".
+
+To make this work you must tell the development server on host "A" to
+listen differently. You need to configure it to listen on IP address
+"0.0.0.0", which means "all available interfaces". Once that is in
+place you can use the IP address to reach "A" from "C". "A" will then
+send API requests on to "B", and present final UI using information
+from "A" and "B" to the browser on "C".
+
+Modify the local settings to something like this:
+
+    module.exports.settings = {
+      devServer: {
+        host: "0.0.0.0",
+        proxy: {
+          '/api': 'http://192.168.1.232:8080'
+        }
+      }
+    };
+
diff --git a/guide/easy-install.md b/guide/easy-install.md
index fbee383..9702357 100644
--- a/guide/easy-install.md
+++ b/guide/easy-install.md
@@ -4,7 +4,7 @@ There are no binary packages of Moonfire NVR available yet, so it must be built
 from source. This is made easy using a few scripts that will do the job for you
 unless you have very a different operating system. The scripts are written and
 tested under ubuntu and raspbian but should not be hard to modify if necessary.
-You'll start by downloading moonfire if you have not already done so.
+You'll start by downloading Moonfire if you have not already done so.
 
 ## Downloading
 
@@ -55,12 +55,12 @@ hard disk.
 
 Start by executing the setup script:
 
-    $ cd moonfire-nr
+    $ cd moonfire-nvr
     $ scripts/setup-ubuntu.sh
 
 If this is the very first time you run this script, a file named `prep.config`
 will be created and the script will stop. This file is where you will set
-or change variables that describe the moonfire installation you want. The
+or change variables that describe the Moonfire installation you want. The
 initial execution will put default values in this value, but only for the
 most commonly changed variables. For a full list of variables, see below.
 
@@ -73,12 +73,12 @@ case you must either resolve those first, or go the manual route.
 The script may be given the "-f" option. If you do, you are telling the script
 that you do not want any existing installation of ffmpeg to be overwritten with
 a newer one. This could be important to you. If you do use it, and the version
-you have installed is not compatible with moonfire, you will be told through
+you have installed is not compatible with Moonfire, you will be told through
 a message. If you have no ffmpeg installed, the option is effectively ignored
 and the necessary version of ffmpeg will be installed.
 
 The setup script should only need to be run once (after `prep.config` has been
-created), although if you do a re-install of moonfire, in particular a much
+created), although if you do a re-install of Moonfire, in particular a much
 newer version, it is a good idea to run it again as requirements and pre-requisites
 may have changed. Running the script multiple times should not have any negative effects.
 
@@ -86,7 +86,7 @@ may have changed. Running the script multiple times should not have any negative
 in particular during the building of libavutil you will see several compiler
 warnings. This, while undesirable, is a direct result of the original
 developers not cleaning up the cause(s) of these warnings. They are, however,
-just warnings and will not affect correct functioning of moonfire.
+just warnings and will not affect correct functioning of Moonfire.
 
 Once the setup is complete, two steps remain: building and then installing.
 There is a script for each of these scenarios, but since generally you would
@@ -99,7 +99,7 @@ The build script is involved like this:
 
     $ scripts/build.sh
 
-This script will perform all steps necessary to build a complete moonfire
+This script will perform all steps necessary to build a complete Moonfire
 setup. If there are no build errors, this script will then automatically
 invoke the install script (see below).
 
@@ -120,7 +120,7 @@ like this:
 
 This script will copy various files resulting from the build to the correct
 locations. It will also create a "service configuration" for systemctl that
-can be used to control moonfire. This service configuration can be prevented
+can be used to control Moonfire. This service configuration can be prevented
 by using the "-s" option to this script. It will also prevent the automatic
 start of this configuration.
 
diff --git a/package.json b/package.json
index 712dd9f..1552e2b 100644
--- a/package.json
+++ b/package.json
@@ -5,13 +5,12 @@
   },
   "scripts": {
     "start": "webpack-dev-server --mode development --config webpack/dev.config.js --progress",
-    "build": "webpack --mode production --config webpack/prod.config.js && cp ui-src/index.html ui-dist/"
+    "build": "webpack --mode production --config webpack/prod.config.js"
   },
   "dependencies": {
     "jquery": "^3.2.1",
     "jquery-ui": "^1.12.1",
-    "moment-timezone": "^0.5.13",
-    "webpack-merge": "^4.1.2"
+    "moment-timezone": "^0.5.13"
   },
   "homepage": "https://github.com/scottlamb/moonfire-nvr",
   "license": "GPL-3.0",
@@ -26,9 +25,11 @@
     "clean-webpack-plugin": "^0.1.18",
     "css-loader": "^0.28.10",
     "file-loader": "^1.1.11",
+    "html-webpack-plugin": "^3.0.6",
     "style-loader": "^0.19.0",
     "webpack": "^4.0.1",
     "webpack-cli": "^2.0.10",
-    "webpack-dev-server": "^3.1.0"
+    "webpack-dev-server": "^3.1.0",
+    "webpack-merge": "^4.1.2"
   }
 }
diff --git a/settings-nvr.js b/settings-nvr.js
new file mode 100644
index 0000000..84f8323
--- /dev/null
+++ b/settings-nvr.js
@@ -0,0 +1,37 @@
+// vim: set et ts=2 sw=2:
+//
+
+/**
+ * This module must export a map, but can use a function with no arguments
+ * that returns a map, or a function that receives the "env" and "args"
+ * values from webpack.
+ *
+ * @type {Object}
+ */
+module.exports.settings = {
+  // Project related: use ./ in front of project root relative files!
+  app_src_dir: './ui-src',
+  dist_dir: './ui-dist',
+
+  // App related
+  app_title: 'Moonfire NVR',
+
+  // Where is the server to be found
+  moonfire: {
+    server: 'localhost',
+    port: 8080,
+  },
+
+  /*
+   * In settings override file you can add sections like below on this level.
+   * After processing, anything defined in mode.production or mode.development,
+   * as appropriate based on --mode argument to webpack, will be merged
+   * into the top level of this settings module. This allows you to add to, or
+   * override anything listed above.
+   *
+   * webpack_mode: {
+   *  production: {},
+   *  development: {},
+  },
+  */
+};
diff --git a/ui-src/index.html b/ui-src/index.html
index c3b4590..96a3e4f 100644
--- a/ui-src/index.html
+++ b/ui-src/index.html
@@ -2,16 +2,14 @@
 <!-- vim: set et: -->
 <html lang="en">
   <head>
-    <title>moonfire ui</title>
-    <script src="bundle.js"></script>
+    <meta http-equiv="Content-type" content="text/html; charset=utf-8"/>
+    <title><%= htmlWebpackPlugin.options.title %></title>
     <style type="text/css">
       #nav {
-        position: fixed;
-        left: 0px;
-        top: 0px;
+        float: left;
         width: 17em;
       }
-      .ui-datepicker { width: 100%; }
+      #nav .ui-datepicker { width: 100%; }
 
       #videos {
         margin-left: 18em;
diff --git a/webpack/NVRSettings.js b/webpack/NVRSettings.js
new file mode 100644
index 0000000..3cd908e
--- /dev/null
+++ b/webpack/NVRSettings.js
@@ -0,0 +1,51 @@
+// vim: set et ts=2 sw=2:
+//
+const path = require('path');
+const Settings = require('./parts/Settings');
+
+/**
+ * Exports a sub-class of Settings specifically for the Moonfire NVR project.
+ *
+ * Gives us a simpler constructor that encapsulates the names of the expected
+ * settings files.
+ *
+ * Provide some convenience member variables:
+ * config {object} Map of the original settings configuration
+ * values {object} The values map of the settings that were configured
+ *
+ * @type {NVRSettings}
+ */
+module.exports = class NVRSettings extends Settings {
+  /**
+   * Construct an NVRSettings object.
+   *
+   * This object will be a subclass of Settings, with some extra functionality.
+   *
+   * Initializes the super Settings object with the proper project root
+   * and named settings files.
+   *
+   *  @param {object} env        "env" object passed to webpack config function
+   *  @param {object} args       "args" object passed to webpack config function
+   * @param  {String} projectRoot Project root, defaults to '.' which is
+   *                              usually the directory from which you run
+   *                              npm or yarn.
+   */
+  constructor(env, args, projectRoot = './') {
+    super({
+      projectRoot: path.resolve(projectRoot),
+      primaryFile: 'settings-nvr.js',
+      secondaryFile: 'settings-nvr-local.js',
+      env: env,
+      args: args,
+    });
+    const config = this.settings_config;
+    // Add some absolute paths that might be relevant
+    this.settings = Object.assign(this.settings, {
+      _paths: {
+        project_root: config.projectRoot,
+        app_src_dir: path.join(config.projectRoot, this.settings.app_src_dir),
+        dist_dir: path.join(config.projectRoot, this.settings.dist_dir),
+      },
+    });
+  }
+};
diff --git a/webpack/base.config.js b/webpack/base.config.js
index 897354e..0546190 100644
--- a/webpack/base.config.js
+++ b/webpack/base.config.js
@@ -1,42 +1,52 @@
+// vim: set et ts=2 sw=2:
+//
+
 const path = require('path');
 const webpack = require('webpack');
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const NVRSettings = require('./NVRSettings');
 
+module.exports = (env, args) => {
+  const nvrSettings = new NVRSettings(env, args).settings;
 
-const project_root = path.join(__dirname, '../');
-const src_dir = path.join(project_root, 'ui-src');
-const dist_dir = path.join(project_root, 'ui-dist');
-
-module.exports = {
-  entry: {
-    nvr: path.join(src_dir, 'index.js'),
-  },
-  output: {
-    filename: 'bundle.js',
-    path: path.resolve(dist_dir),
-  },
-  module: {
-    rules: [{
-      test: /\.js$/,
-      loader: 'babel',
-      query: {
-        'presets': ['env', {}],
-      },
-      include: [path.resolve(__dirname, './ui-src'), path.resolve(__dirname, './ui-src/lib')],
-    }, {
-      test: /\.png$/,
-      use: ['file-loader'],
-    }, {
-      test: /\.css$/,
-      loader: 'style-loader!css-loader',
-    }],
-  },
-  plugins: [
-    new webpack.IgnorePlugin(/\.\/locale$/),
-    new webpack.NormalModuleReplacementPlugin(
-      /node_modules\/moment\/moment\.js$/,
-      './min/moment.min.js'),
-    new webpack.NormalModuleReplacementPlugin(
-      /node_modules\/moment-timezone\/index\.js$/,
-      './builds/moment-timezone-with-data-2012-2022.min.js'),
-  ],
+  return {
+    entry: {
+      nvr: path.join(nvrSettings._paths.app_src_dir, 'index.js'),
+    },
+    output: {
+      filename: '[name].bundle.js',
+      path: nvrSettings._paths.dist_dir,
+    },
+    module: {
+      rules: [{
+        test: /\.js$/,
+        loader: 'babel-loader',
+        query: {
+          'presets': ['env'],
+        },
+        exclude: /(node_modules|bower_components)/,
+        include: [ './ui-src'],
+      }, {
+        test: /\.png$/,
+        use: ['file-loader'],
+      }, {
+        // Load css and then in-line in head
+        test: /\.css$/,
+        loader: 'style-loader!css-loader',
+      }],
+    },
+    plugins: [
+      new webpack.IgnorePlugin(/\.\/locale$/),
+      new HtmlWebpackPlugin({
+        title: nvrSettings.app_title,
+        template: path.join(nvrSettings._paths.app_src_dir, 'index.html'),
+      }),
+      new webpack.NormalModuleReplacementPlugin(
+        /node_modules\/moment\/moment\.js$/,
+        './min/moment.min.js'),
+      new webpack.NormalModuleReplacementPlugin(
+        /node_modules\/moment-timezone\/index\.js$/,
+        './builds/moment-timezone-with-data-2012-2022.min.js'),
+    ],
+  };
 };
diff --git a/webpack/dev.config.js b/webpack/dev.config.js
index d17ad71..bd5b703 100644
--- a/webpack/dev.config.js
+++ b/webpack/dev.config.js
@@ -1,26 +1,35 @@
-const path = require('path');
-const webpack = require('webpack');
-const merge = require('webpack-merge');
+// vim: set et ts=2 sw=2:
+//
 
+const webpack = require('webpack');
+const NVRSettings = require('./NVRSettings');
 const baseConfig = require('./base.config.js');
 
-module.exports = merge(baseConfig, {
-  devtool: 'inline-source-map',
-  devServer: {
-    contentBase: './ui-src',
-    historyApiFallback: true,
-    inline: true,
-    port: 3000,
-    hot: true,
-    clientLogLevel: 'info',
-    proxy: {
-	    '/api': 'http://localhost:8080'
-    }
-  },
-  plugins: [
-    new webpack.DefinePlugin({
-      'process.env.NODE_ENV': JSON.stringify('development'),
-    }),
-    new webpack.HotModuleReplacementPlugin(),
-  ],
-});
+module.exports = (env, args) => {
+  const settingsObject = new NVRSettings(env, args);
+  const nvrSettings = settingsObject.settings;
+
+  return settingsObject.webpackMerge(baseConfig, {
+    stats: {
+      warnings: true,
+    },
+    devtool: 'inline-source-map',
+    devServer: {
+      contentBase: nvrSettings.app_src_dir,
+      historyApiFallback: true,
+      inline: true,
+      port: 3000,
+      hot: true,
+      clientLogLevel: 'info',
+      proxy: {
+        '/api': `http://${nvrSettings.moonfire.server}:${nvrSettings.moonfire.port}`,
+      },
+    },
+    plugins: [
+      new webpack.DefinePlugin({
+        'process.env.NODE_ENV': JSON.stringify('development'),
+      }),
+      new webpack.HotModuleReplacementPlugin(),
+    ],
+  });
+};
diff --git a/webpack/parts/Settings.js b/webpack/parts/Settings.js
new file mode 100644
index 0000000..d71848e
--- /dev/null
+++ b/webpack/parts/Settings.js
@@ -0,0 +1,200 @@
+// vim: set et ts=2 sw=2:
+//
+const path = require('path');
+const merge = require('webpack-merge');
+
+/**
+ * Helper function to require a file and catch errors so we can
+ * distinguish between failure to find the module and errors in the
+ * module.
+ *
+ * When a require results in errors (as opposed to the file not being
+ * found), we throw an exception.
+ *
+ * If the module that is require-d is a function, it will be executed,
+ * passing the "env" and "args" parameters from the settingsConfig to it.
+ * The function should return a map.
+ *
+ * @param  {String} path            Path to be passed to require()
+ * @param  {object} settingsConfig  Settings passed to new Settings()
+ * @param  {Boolean} optional       True file not to exist
+ * @return {object}                 The module, or {} if not found (optional)
+ */
+function requireHelper(path, settingsConfig, optional) {
+  let module = {};
+  try {
+    require.resolve(path); // Throws if not found
+    try {
+      module = require(path);
+      if (typeof(module) === 'function') {
+        module = module(settingsConfig.env, settingsConfig.args);
+      }
+      // Get owned properties only: now a literal map
+      module = Object.assign({}, require(path).settings);
+    } catch (e) {
+      throw new Error('Settings file (' + path + ') has errors.');
+    }
+  } catch (e) {
+    if (!optional) {
+      throw new Error('Settings file (' + path + ') not found.');
+    }
+  }
+  const args = settingsConfig.args;
+  const webpackMode = (args ? args.mode : null) || 'none';
+  const modes = module.webpack_mode || {};
+  delete module.webpack_mode; // Not modifying original module. We have a copy!
+  if (webpackMode && modes) {
+    module = merge(module, modes[webpackMode]);
+  }
+  return module;
+}
+
+/**
+ * General purpose settings loading class.
+ *
+ * The class first reads a specified file extracting a map object with
+ * settings. It then attempts to read a second file which, if successfull,
+ * will be merged to override values from the first.
+ *
+ * The module exported in each file must either be a map, in which case
+ * it is used directly, or a function with no arguments. In the latter case
+ * it will be called in order to obtain the map.
+ *
+ * The intended use is that the first file contains project level settings
+ * that are checked into a repository. The second file should be for local
+ * (development) overrides and should not be checked in.
+ *
+ * If the primary file is allowed optional and is not found, we still
+ * attempt to read the secondary, but it is never an error if that file
+ * does not exist.
+ *
+ * Both primary and secondary files may contain a property called webpack_mode
+ * that, in turn, may contain properties named "development" and
+ * "production". During loading, if these properties are present, the whole
+ * "webpack_mode" property is *NOT* delivered in the final result, but the
+ * sub-property corresponding to webpack's "--mode" argument is merged
+ * with the configuration object at the top-level. This allows either
+ * sub-property to override defaults in the settings.
+ *
+ * Provide some convenience member variables in the Settings object:
+ * settings_config {object} object with the arguments to the constructor
+ * settings {object} The values map of the settings that were configured
+ *
+ * In many cases a user of this class will only be intersted in the values
+ * component. A typical usage patterns would the be:
+ * <pre><code>
+ * const Settings = require('Settings');
+ * const settings = (new Settings()).values;
+ * </code></pre>
+ *
+ * This does make the "config" component of the Settings instance unavailable.
+ * That can be remedied:
+ * <pre><code>
+ * const Settings = require('Settings');
+ * const _settings = new Settings();
+ * const settings = _settings.values;
+ * </code></pre>
+ *
+ * Now the config is available as "_settings.config".
+ *
+ * @type {NVRSettings}
+ */
+class Settings {
+  /**
+   * Construct the settings object by attempting to read and merge
+   * both files.
+   *
+   * Settings file and alternate or specified as filenames only. They
+   * are always looked for in the project root directory.
+   *
+   * "env", and "args" options are intended to be passed in like so:
+   * <pre><code>
+   * const Settings = require('./Settings');
+   *
+   * module.exports = (env, args) => {
+   *   const settingsObject = new Settings({ env: env, args: args });
+   *   const settings = settingsObject.settings;
+   *
+   *   return {
+   *   ... webpack config here, using things like
+   *   ... settings.app_title
+   *   };
+   * }
+   * </code></pre>
+   *
+   * The Settings object inspects "args.mode" to determine how to overload
+   * some settings values, and defaults to 'none' if not present.
+   * Alternatively, null can be passed for "env", and you could pass
+   * <pre>{ mode: 'development' }</pre> for args (or use 'production').
+   * Both values will be available later from  settingsObject.settings_config
+   * and using the values from webpack gives full access to everything webpack
+   * knows.
+   *
+   * @param  {Boolean} options.optional     True if main file is optional
+   * @param  {String}  options.projectRoot  Path to project root
+   * @param  {String}  options.primaryFile   Name of main settings file
+   * @param  {String}  options.secondaryFile Name of secondary settings file
+   * @param  {String}  options.env          Environment variables (from webpack)
+   * @param  {String}  options.args         Arguments (from webpack)
+   */
+  constructor({
+    optional = false,
+    projectRoot = './',
+    primaryFile = 'settings.js',
+    secondaryFile = 'settings-local.js',
+    env = null,
+    args = null,
+  } = {}) {
+    if (!projectRoot) {
+      throw new Error('projectRoot argument for Settings is not set.');
+    }
+
+    // Remember settings, as provided
+    // eslint-disable-next-line prefer-rest-params
+    this.settings_config = arguments[0];
+
+    // Convert settings file names into absolute paths.
+    const primaryPath = path.resolve(projectRoot, primaryFile);
+    const secondaryPath = path.resolve(projectRoot, secondaryFile);
+
+    // Check if we can resolve the primary file and if we can, require it.
+    const _settings =
+      requireHelper(primaryPath, this.settings_config, optional);
+
+    // Merge secondary override file, if it exists
+    this.settings = merge(_settings,
+      requireHelper(secondaryPath, this.settings_config, true));
+  };
+
+  /**
+   * Take one or more webpack configurations and merge them.
+   *
+   * This uses the webpack-merge functionality, but each argument is subjected
+   * to some pre-processing.
+   * - If the argument is a string, a 'require' is performed with it first
+   * - If the remaining value is a function, it is expected to be like a
+   *   webpack initialization function which gets passed "env" and "args"
+   *   and it is called like that.
+   * - The remaining value is fed to webpack-merge.
+   *
+   * @param  {[object]} webpackConfig1 Object representing the config
+   * @return {[type]}                  Merged configuration
+   */
+  webpackMerge(...packs) {
+    const unpack = (webpackConfig) => {
+      if ((typeof(webpackConfig) === 'string') ||
+        (webpackConfig instanceof String)) {
+        webpackConfig = require(webpackConfig);
+      }
+      const config = this.settings_config;
+      if (typeof(webpackConfig) === 'function') {
+        return webpackConfig(config.env, config.args);
+      }
+      return webpackConfig;
+    };
+
+    return merge(packs.map((p) => unpack(p)));
+  }
+}
+
+module.exports = Settings;
diff --git a/webpack/prod.config.js b/webpack/prod.config.js
index e54a0ee..91afa7d 100644
--- a/webpack/prod.config.js
+++ b/webpack/prod.config.js
@@ -1,15 +1,40 @@
-const path = require('path');
+// vim: set et ts=2 sw=2:
+//
+
 const webpack = require('webpack');
-const merge = require('webpack-merge');
+const NVRSettings = require('./NVRSettings');
 const baseConfig = require('./base.config.js');
 
 const CleanWebpackPlugin = require('clean-webpack-plugin');
 
-module.exports = merge(baseConfig, {
-  plugins: [
-    new webpack.DefinePlugin({
-      'process.env.NODE_ENV': JSON.stringify('production'),
-    }),
-    new CleanWebpackPlugin(['ui-dist'], { root: path.resolve(__dirname, '../') }),
-  ],
-});
+module.exports = (env, args) => {
+  const settingsObject = new NVRSettings(env, args);
+  const nvrSettings = settingsObject.settings;
+
+  return settingsObject.webpackMerge(baseConfig, {
+    optimization: {
+      splitChunks: {
+        cacheGroups: {
+          default: {
+            minChunks: 2,
+            priority: -20,
+          },
+          commons: {
+            test: /[\\/]node_modules[\\/]/,
+            name: 'vendor',
+            chunks: 'all',
+            priority: -10,
+          },
+        },
+      },
+    },
+    plugins: [
+      new webpack.DefinePlugin({
+        'process.env.NODE_ENV': JSON.stringify('production'),
+      }),
+      new CleanWebpackPlugin([nvrSettings.dist_dir], {
+        root: nvrSettings._paths.project_root,
+      }),
+    ],
+  });
+};
diff --git a/yarn.lock b/yarn.lock
index 91788ad..4e80d73 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1163,6 +1163,10 @@ bonjour@^3.5.0:
     multicast-dns "^6.0.1"
     multicast-dns-service-types "^1.1.0"
 
+boolbase@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
+
 boom@2.x.x:
   version "2.10.1"
   resolved "https://registry.yarnpkg.com/boom/-/boom-2.10.1.tgz#39c8918ceff5799f83f9492a848f625add0c766f"
@@ -1343,6 +1347,13 @@ cacheable-request@^2.1.1:
     normalize-url "2.0.1"
     responselike "1.0.2"
 
+camel-case@3.0.x:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/camel-case/-/camel-case-3.0.0.tgz#ca3c3688a4e9cf3a4cda777dc4dcbc713249cf73"
+  dependencies:
+    no-case "^2.2.0"
+    upper-case "^1.1.1"
+
 camelcase-keys@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/camelcase-keys/-/camelcase-keys-2.1.0.tgz#308beeaffdf28119051efa1d932213c91b8f92e7"
@@ -1465,6 +1476,12 @@ class-utils@^0.3.5:
     isobject "^3.0.0"
     static-extend "^0.1.1"
 
+clean-css@4.1.x:
+  version "4.1.10"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.10.tgz#3dfc2c2569d5f03c14b41d875ad9bccae09cb89e"
+  dependencies:
+    source-map "0.5.x"
+
 clean-webpack-plugin@^0.1.18:
   version "0.1.18"
   resolved "https://registry.yarnpkg.com/clean-webpack-plugin/-/clean-webpack-plugin-0.1.18.tgz#2e2173897c76646031bff047c14b9c22c80d8c4a"
@@ -1627,6 +1644,10 @@ combined-stream@^1.0.5, combined-stream@~1.0.5:
   dependencies:
     delayed-stream "~1.0.0"
 
+commander@2.14.x, commander@~2.14.1:
+  version "2.14.1"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.14.1.tgz#2235123e37af8ca3c65df45b026dbd357b01b9aa"
+
 commander@~2.13.0:
   version "2.13.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.13.0.tgz#6964bca67685df7c1f1430c584f07d7597885b9c"
@@ -1823,6 +1844,15 @@ css-loader@^0.28.10:
     postcss-value-parser "^3.3.0"
     source-list-map "^2.0.0"
 
+css-select@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/css-select/-/css-select-1.2.0.tgz#2b3a110539c5355f1cd8d314623e870b121ec858"
+  dependencies:
+    boolbase "~1.0.0"
+    css-what "2.1"
+    domutils "1.5.1"
+    nth-check "~1.0.1"
+
 css-selector-tokenizer@^0.7.0:
   version "0.7.0"
   resolved "https://registry.yarnpkg.com/css-selector-tokenizer/-/css-selector-tokenizer-0.7.0.tgz#e6988474ae8c953477bf5e7efecfceccd9cf4c86"
@@ -1831,6 +1861,10 @@ css-selector-tokenizer@^0.7.0:
     fastparse "^1.1.1"
     regexpu-core "^1.0.0"
 
+css-what@2.1:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/css-what/-/css-what-2.1.0.tgz#9467d032c38cfaefb9f2d79501253062f87fa1bd"
+
 cssesc@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-0.1.0.tgz#c814903e45623371a0477b40109aaafbeeaddbb4"
@@ -2060,6 +2094,19 @@ dns-txt@^2.0.2:
   dependencies:
     buffer-indexof "^1.0.0"
 
+dom-converter@~0.1:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/dom-converter/-/dom-converter-0.1.4.tgz#a45ef5727b890c9bffe6d7c876e7b19cb0e17f3b"
+  dependencies:
+    utila "~0.3"
+
+dom-serializer@0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/dom-serializer/-/dom-serializer-0.1.0.tgz#073c697546ce0780ce23be4a28e293e40bc30c82"
+  dependencies:
+    domelementtype "~1.1.1"
+    entities "~1.1.1"
+
 dom-walk@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/dom-walk/-/dom-walk-0.1.1.tgz#672226dc74c8f799ad35307df936aba11acd6018"
@@ -2068,6 +2115,33 @@ domain-browser@^1.1.1:
   version "1.1.7"
   resolved "https://registry.yarnpkg.com/domain-browser/-/domain-browser-1.1.7.tgz#867aa4b093faa05f1de08c06f4d7b21fdf8698bc"
 
+domelementtype@1:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/domelementtype/-/domelementtype-1.3.0.tgz#b17aed82e8ab59e52dd9c19b1756e0fc187204c2"
+
+domelementtype@~1.1.1:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/domelementtype/-/domelementtype-1.1.3.tgz#bd28773e2642881aec51544924299c5cd822185b"
+
+domhandler@2.1:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/domhandler/-/domhandler-2.1.0.tgz#d2646f5e57f6c3bab11cf6cb05d3c0acf7412594"
+  dependencies:
+    domelementtype "1"
+
+domutils@1.1:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/domutils/-/domutils-1.1.6.tgz#bddc3de099b9a2efacc51c623f28f416ecc57485"
+  dependencies:
+    domelementtype "1"
+
+domutils@1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/domutils/-/domutils-1.5.1.tgz#dcd8488a26f563d61079e48c9f7b7e32373682cf"
+  dependencies:
+    dom-serializer "0"
+    domelementtype "1"
+
 duplexer3@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/duplexer3/-/duplexer3-0.1.4.tgz#ee01dd1cac0ed3cbc7fdbea37dc0a8f1ce002ce2"
@@ -2145,6 +2219,10 @@ enhanced-resolve@^4.0.0:
     memory-fs "^0.4.0"
     tapable "^1.0.0"
 
+entities@~1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/entities/-/entities-1.1.1.tgz#6e5c2d0a5621b5dadaecef80b90edfb5cd7772f0"
+
 errno@^0.1.3:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/errno/-/errno-0.1.4.tgz#b896e23a9e5e8ba33871fc996abd3635fc9a1c7d"
@@ -2170,7 +2248,7 @@ error@^7.0.2:
     string-template "~0.2.1"
     xtend "~4.0.0"
 
-es-abstract@^1.7.0:
+es-abstract@^1.5.1, es-abstract@^1.7.0:
   version "1.10.0"
   resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.10.0.tgz#1ecb36c197842a00d8ee4c2dfd8646bb97d60864"
   dependencies:
@@ -2907,6 +2985,10 @@ hawk@3.1.3, hawk@~3.1.3:
     hoek "2.x.x"
     sntp "1.x.x"
 
+he@1.1.x:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/he/-/he-1.1.1.tgz#93410fd21b009735151f8868c2f271f3427e23fd"
+
 hmac-drbg@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
@@ -2953,6 +3035,40 @@ html-entities@^1.2.0:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/html-entities/-/html-entities-1.2.1.tgz#0df29351f0721163515dfb9e5543e5f6eed5162f"
 
+html-minifier@^3.2.3:
+  version "3.5.10"
+  resolved "https://registry.yarnpkg.com/html-minifier/-/html-minifier-3.5.10.tgz#8522c772c388db81aa5c26f62033302d906ea1c7"
+  dependencies:
+    camel-case "3.0.x"
+    clean-css "4.1.x"
+    commander "2.14.x"
+    he "1.1.x"
+    ncname "1.0.x"
+    param-case "2.1.x"
+    relateurl "0.2.x"
+    uglify-js "3.3.x"
+
+html-webpack-plugin@^3.0.6:
+  version "3.0.6"
+  resolved "https://registry.yarnpkg.com/html-webpack-plugin/-/html-webpack-plugin-3.0.6.tgz#d35b0452aae129a8a9f3fac44a169a625d8cf3fa"
+  dependencies:
+    html-minifier "^3.2.3"
+    loader-utils "^0.2.16"
+    lodash "^4.17.3"
+    pretty-error "^2.0.2"
+    tapable "^1.0.0"
+    toposort "^1.0.0"
+    util.promisify "1.0.0"
+
+htmlparser2@~3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/htmlparser2/-/htmlparser2-3.3.0.tgz#cc70d05a59f6542e43f0e685c982e14c924a9efe"
+  dependencies:
+    domelementtype "1"
+    domhandler "2.1"
+    domutils "1.1"
+    readable-stream "1.0"
+
 http-cache-semantics@3.8.1:
   version "3.8.1"
   resolved "https://registry.yarnpkg.com/http-cache-semantics/-/http-cache-semantics-3.8.1.tgz#39b0e16add9b605bf0a9ef3d9daaf4843b4cacd2"
@@ -3421,6 +3537,10 @@ is-wsl@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-wsl/-/is-wsl-1.1.0.tgz#1f16e4aa22b04d1336b66188a66af3c600c3a66d"
 
+isarray@0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/isarray/-/isarray-0.0.1.tgz#8a18acfca9a8f4177e09abfc6038939b05d1eedf"
+
 isarray@1.0.0, isarray@^1.0.0, isarray@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
@@ -3669,6 +3789,15 @@ loader-runner@^2.3.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/loader-runner/-/loader-runner-2.3.0.tgz#f482aea82d543e07921700d5a46ef26fdac6b8a2"
 
+loader-utils@^0.2.16:
+  version "0.2.17"
+  resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-0.2.17.tgz#f86e6374d43205a6e6c60e9196f17c0299bfb348"
+  dependencies:
+    big.js "^3.1.3"
+    emojis-list "^2.0.0"
+    json5 "^0.5.0"
+    object-assign "^4.0.1"
+
 loader-utils@^1.0.2, loader-utils@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-1.1.0.tgz#c98aef488bcceda2ffb5e2de646d6a754429f5cd"
@@ -3704,7 +3833,7 @@ lodash.uniq@^4.5.0:
   version "4.5.0"
   resolved "https://registry.yarnpkg.com/lodash.uniq/-/lodash.uniq-4.5.0.tgz#d0225373aeb652adc1bc82e4945339a842754773"
 
-lodash@^4.11.1, lodash@^4.13.1, lodash@^4.17.2, lodash@^4.17.5, lodash@^4.3.0:
+lodash@^4.11.1, lodash@^4.13.1, lodash@^4.17.2, lodash@^4.17.3, lodash@^4.17.5, lodash@^4.3.0:
   version "4.17.5"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.5.tgz#99a92d65c0272debe8c96b6057bc8fbfa3bed511"
 
@@ -3752,6 +3881,10 @@ loud-rejection@^1.0.0, loud-rejection@^1.6.0:
     currently-unhandled "^0.4.1"
     signal-exit "^3.0.0"
 
+lower-case@^1.1.1:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/lower-case/-/lower-case-1.1.4.tgz#9a2cabd1b9e8e0ae993a4bf7d5875c39c42e8eac"
+
 lowercase-keys@1.0.0, lowercase-keys@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/lowercase-keys/-/lowercase-keys-1.0.0.tgz#4e3366b39e7f5457e35f1324bdf6f88d0bfc7306"
@@ -4074,6 +4207,12 @@ nanomatch@^1.2.9:
     snapdragon "^0.8.1"
     to-regex "^3.0.1"
 
+ncname@1.0.x:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/ncname/-/ncname-1.0.0.tgz#5b57ad18b1ca092864ef62b0b1ed8194f383b71c"
+  dependencies:
+    xml-char-classes "^1.0.0"
+
 negotiator@0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.1.tgz#2b327184e8992101177b28563fb5e7102acd0ca9"
@@ -4086,6 +4225,12 @@ nice-try@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.4.tgz#d93962f6c52f2c1558c0fbda6d512819f1efe1c4"
 
+no-case@^2.2.0:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/no-case/-/no-case-2.3.2.tgz#60b813396be39b3f1288a4c1ed5d1e7d28b464ac"
+  dependencies:
+    lower-case "^1.1.1"
+
 node-dir@0.1.8:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/node-dir/-/node-dir-0.1.8.tgz#55fb8deb699070707fb67f91a460f0448294c77d"
@@ -4202,6 +4347,12 @@ npmlog@^4.0.2:
     gauge "~2.7.3"
     set-blocking "~2.0.0"
 
+nth-check@~1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/nth-check/-/nth-check-1.0.1.tgz#9929acdf628fc2c41098deab82ac580cf149aae4"
+  dependencies:
+    boolbase "~1.0.0"
+
 num2fraction@^1.2.2:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/num2fraction/-/num2fraction-1.2.2.tgz#6f682b6a027a4e9ddfa4564cd2589d1d4e669ede"
@@ -4236,6 +4387,13 @@ object-visit@^1.0.0:
   dependencies:
     isobject "^3.0.0"
 
+object.getownpropertydescriptors@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.0.3.tgz#8758c846f5b407adab0f236e0986f14b051caa16"
+  dependencies:
+    define-properties "^1.1.2"
+    es-abstract "^1.5.1"
+
 object.omit@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/object.omit/-/object.omit-2.0.1.tgz#1a9c744829f39dbb858c76ca3579ae2a54ebd1fa"
@@ -4395,6 +4553,12 @@ parallel-transform@^1.1.0:
     inherits "^2.0.3"
     readable-stream "^2.1.5"
 
+param-case@2.1.x:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/param-case/-/param-case-2.1.1.tgz#df94fd8cf6531ecf75e6bef9a0858fbc72be2247"
+  dependencies:
+    no-case "^2.2.0"
+
 parse-asn1@^5.0.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/parse-asn1/-/parse-asn1-5.1.0.tgz#37c4f9b7ed3ab65c74817b5f2480937fbf97c712"
@@ -4800,6 +4964,13 @@ pretty-bytes@^4.0.2:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/pretty-bytes/-/pretty-bytes-4.0.2.tgz#b2bf82e7350d65c6c33aa95aaa5a4f6327f61cd9"
 
+pretty-error@^2.0.2:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/pretty-error/-/pretty-error-2.1.1.tgz#5f4f87c8f91e5ae3f3ba87ab4cf5e03b1a17f1a3"
+  dependencies:
+    renderkid "^2.0.1"
+    utila "~0.4"
+
 private@^0.1.6, private@^0.1.7, private@~0.1.5:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"
@@ -5003,6 +5174,15 @@ read-pkg@^2.0.0:
     string_decoder "~1.0.3"
     util-deprecate "~1.0.1"
 
+readable-stream@1.0:
+  version "1.0.34"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-1.0.34.tgz#125820e34bc842d2f2aaafafe4c2916ee32c157c"
+  dependencies:
+    core-util-is "~1.0.0"
+    inherits "~2.0.1"
+    isarray "0.0.1"
+    string_decoder "~0.10.x"
+
 readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.4, readable-stream@^2.2.6:
   version "2.3.3"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.3.tgz#368f2512d79f9d46fdfc71349ae7878bbc1eb95c"
@@ -5125,10 +5305,24 @@ regjsparser@^0.1.4:
   dependencies:
     jsesc "~0.5.0"
 
+relateurl@0.2.x:
+  version "0.2.7"
+  resolved "https://registry.yarnpkg.com/relateurl/-/relateurl-0.2.7.tgz#54dbf377e51440aca90a4cd274600d3ff2d888a9"
+
 remove-trailing-separator@^1.0.1:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz#c24bce2a283adad5bc3f58e0d48249b92379d8ef"
 
+renderkid@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/renderkid/-/renderkid-2.0.1.tgz#898cabfc8bede4b7b91135a3ffd323e58c0db319"
+  dependencies:
+    css-select "^1.1.0"
+    dom-converter "~0.1"
+    htmlparser2 "~3.3.0"
+    strip-ansi "^3.0.0"
+    utila "~0.3"
+
 repeat-element@^1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/repeat-element/-/repeat-element-1.1.2.tgz#ef089a178d1483baae4d93eb98b4f9e4e11d990a"
@@ -5554,7 +5748,7 @@ source-map-url@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
 
-source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.3:
+source-map@0.5.x, source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.3:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
@@ -5708,7 +5902,7 @@ string-width@^2.0.0, string-width@^2.1.0:
     is-fullwidth-code-point "^2.0.0"
     strip-ansi "^4.0.0"
 
-string_decoder@^0.10.25:
+string_decoder@^0.10.25, string_decoder@~0.10.x:
   version "0.10.31"
   resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-0.10.31.tgz#62e203bc41766c6c28c9fc84301dab1c5310fa94"
 
@@ -5925,6 +6119,10 @@ to-regex@^3.0.1:
     regex-not "^1.0.2"
     safe-regex "^1.1.0"
 
+toposort@^1.0.0:
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/toposort/-/toposort-1.0.6.tgz#c31748e55d210effc00fdcdc7d6e68d7d7bb9cec"
+
 tough-cookie@~2.3.0:
   version "2.3.3"
   resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.3.3.tgz#0b618a5565b6dea90bf3425d04d55edc475a7561"
@@ -5971,6 +6169,13 @@ uglify-es@^3.3.4:
     commander "~2.13.0"
     source-map "~0.6.1"
 
+uglify-js@3.3.x:
+  version "3.3.13"
+  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.3.13.tgz#8a1a89eeb16e2d6a66b0db2b04cb871af3c669cf"
+  dependencies:
+    commander "~2.14.1"
+    source-map "~0.6.1"
+
 uglifyjs-webpack-plugin@^1.1.1, uglifyjs-webpack-plugin@^1.2.2:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.2.tgz#e7516d4367afdb715c3847841eb46f94c45ca2b9"
@@ -6052,6 +6257,10 @@ upath@^1.0.0:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/upath/-/upath-1.0.4.tgz#ee2321ba0a786c50973db043a50b7bcba822361d"
 
+upper-case@^1.1.1:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/upper-case/-/upper-case-1.1.3.tgz#f6b4501c2ec4cdd26ba78be7222961de77621598"
+
 urix@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/urix/-/urix-0.1.0.tgz#da937f7a62e21fec1fd18d49b35c2935067a6c72"
@@ -6113,12 +6322,27 @@ util-deprecate@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
 
+util.promisify@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/util.promisify/-/util.promisify-1.0.0.tgz#440f7165a459c9a16dc145eb8e72f35687097030"
+  dependencies:
+    define-properties "^1.1.2"
+    object.getownpropertydescriptors "^2.0.3"
+
 util@0.10.3, util@^0.10.3:
   version "0.10.3"
   resolved "https://registry.yarnpkg.com/util/-/util-0.10.3.tgz#7afb1afe50805246489e3db7fe0ed379336ac0f9"
   dependencies:
     inherits "2.0.1"
 
+utila@~0.3:
+  version "0.3.3"
+  resolved "https://registry.yarnpkg.com/utila/-/utila-0.3.3.tgz#d7e8e7d7e309107092b05f8d9688824d633a4226"
+
+utila@~0.4:
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/utila/-/utila-0.4.0.tgz#8a16a05d445657a3aea5eecc5b12a4fa5379772c"
+
 utils-merge@1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/utils-merge/-/utils-merge-1.0.1.tgz#9f95710f50a267947b2ccc124741c1028427e713"
@@ -6403,6 +6627,10 @@ write-file-atomic@^1.2.0:
     imurmurhash "^0.1.4"
     slide "^1.1.5"
 
+xml-char-classes@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/xml-char-classes/-/xml-char-classes-1.0.0.tgz#64657848a20ffc5df583a42ad8a277b4512bbc4d"
+
 xtend@^4.0.0, xtend@~4.0.0, xtend@~4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"