diff --git a/build/DevServer.js b/build/DevServer.js
index fed9730..3fcb15b 100644
--- a/build/DevServer.js
+++ b/build/DevServer.js
@@ -32,6 +32,9 @@ var _webpack2 = _interopRequireDefault(_webpack);
 
 var _path = require('path');
 
+var LIVERELOAD_PORT = 35729,
+    WEB_PORT = 3000;
+
 /**
  * A lightweight development server that rapidly recompiles the JavaScript and SASS files when they are edited and
  * updates the page.
@@ -61,7 +64,7 @@ var DevServer = (function () {
   function DevServer(script, style, devDir) {
     var _this = this;
 
-    var port = arguments.length <= 3 || arguments[3] === undefined ? 3000 : arguments[3];
+    var port = arguments.length <= 3 || arguments[3] === undefined ? WEB_PORT : arguments[3];
     var react = arguments.length <= 4 || arguments[4] === undefined ? true : arguments[4];
 
     _classCallCheck(this, DevServer);
@@ -158,7 +161,7 @@ var DevServer = (function () {
   _createClass(DevServer, [{
     key: 'watchSASS',
     value: function watchSASS(watchDir) {
-      this.lr.listen(35729);
+      this.lr.listen(LIVERELOAD_PORT);
       this.compileSASS();
       (0, _watch2['default'])(watchDir, 'scss', this.compileSASS);
     }
diff --git a/build/SASSCompile.js b/build/SASSCompile.js
index a1be420..1d85be0 100644
--- a/build/SASSCompile.js
+++ b/build/SASSCompile.js
@@ -16,13 +16,14 @@ var _nodeSassImportOnce = require('node-sass-import-once');
 
 var _nodeSassImportOnce2 = _interopRequireDefault(_nodeSassImportOnce);
 
-var options = {
+var precision = 8,
+    options = {
   file: null,
   outFile: null,
   importer: _nodeSassImportOnce2['default'],
   importOnce: { index: true, css: false, bower: false },
   includePaths: ['node_modules/bootstrap-sass/assets/stylesheets', 'node_modules'],
-  precision: 8,
+  precision: precision,
   sourceMap: true,
   sourceMapContents: true
 };
diff --git a/build/cssMin.js b/build/cssMin.js
index 045c658..5a019ba 100644
--- a/build/cssMin.js
+++ b/build/cssMin.js
@@ -11,6 +11,8 @@ var _cleanCss = require('clean-css');
 
 var _cleanCss2 = _interopRequireDefault(_cleanCss);
 
+var roundingPrecision = -1;
+
 /**
  * Minifies CSS
  *
@@ -27,7 +29,7 @@ function cssMin(data) {
   var sourceMappingURL = data.code.match(/\n.+$/)[0],
       result = new _cleanCss2['default']({
     keepSpecialComments: 0,
-    roundingPrecision: -1,
+    roundingPrecision: roundingPrecision,
     sourceMap: data.map,
     sourceMapInlineSources: true
   }).minify(data.code);
diff --git a/build/watch.js b/build/watch.js
index c126762..af504d2 100644
--- a/build/watch.js
+++ b/build/watch.js
@@ -7,7 +7,8 @@ exports['default'] = watch;
 
 var _fbWatchman = require('fb-watchman');
 
-var client = new _fbWatchman.Client();
+var client = new _fbWatchman.Client(),
+    ALPHANUMERIC_BASE = 36;
 
 /**
  * Using the Facebook Watchman, watches the directory "dir" for changes of files with extension "type" and runs
@@ -26,7 +27,7 @@ var client = new _fbWatchman.Client();
  */
 
 function watch(dir, type, callback) {
-  var subscription = Number(Date.now()).toString(36);
+  var subscription = Number(Date.now()).toString(ALPHANUMERIC_BASE);
 
   client.capabilityCheck({}, function (capabilityErr) {
     if (capabilityErr) {
diff --git a/config/eslint.yml b/config/eslint.yml
index 3b6ba5e..e90bb0a 100644
--- a/config/eslint.yml
+++ b/config/eslint.yml
@@ -101,3 +101,5 @@ rules:
   id-length: 0
   no-negated-condition: 2
   no-mixed-spaces-and-tabs: [ 2, false ]
+  no-magic-numbers: [ 2, { enforceConst: true, detectObjects: true } ]
+  no-empty-pattern: 2
diff --git a/lib/DevServer.js b/lib/DevServer.js
index 90e3667..498f026 100644
--- a/lib/DevServer.js
+++ b/lib/DevServer.js
@@ -7,6 +7,9 @@ import WebpackDevServer from 'webpack-dev-server';
 import webpack from 'webpack';
 import {join} from 'path';
 
+const LIVERELOAD_PORT = 35729,
+    WEB_PORT = 3000;
+
 /**
  * A lightweight development server that rapidly recompiles the JavaScript and SASS files when they are edited and
  * updates the page.
@@ -41,7 +44,7 @@ export default class DevServer {
 
   server: WebpackDevServer;
 
-  constructor(script: string, style: string, devDir: string, port: number = 3000, react: boolean = true) {
+  constructor(script: string, style: string, devDir: string, port: number = WEB_PORT, react: boolean = true) {
     const sass = new SASS(), loaders = [];
 
     if (react) {
@@ -150,7 +153,7 @@ export default class DevServer {
    * server.watchSASS('/path/to/some/directory');
    */
   watchSASS(watchDir: string) {
-    this.lr.listen(35729);
+    this.lr.listen(LIVERELOAD_PORT);
     this.compileSASS();
     watch(watchDir, 'scss', this.compileSASS);
   }
diff --git a/lib/SASSCompile.js b/lib/SASSCompile.js
index e0e8067..c5d2c30 100644
--- a/lib/SASSCompile.js
+++ b/lib/SASSCompile.js
@@ -3,16 +3,17 @@
 import {render} from 'node-sass';
 import importer from 'node-sass-import-once';
 
-const options = {
-  file: null,
-  outFile: null,
-  importer,
-  importOnce: {index: true, css: false, bower: false},
-  includePaths: ['node_modules/bootstrap-sass/assets/stylesheets', 'node_modules'],
-  precision: 8,
-  sourceMap: true,
-  sourceMapContents: true
-};
+const precision = 8,
+    options = {
+      file: null,
+      outFile: null,
+      importer,
+      importOnce: {index: true, css: false, bower: false},
+      includePaths: ['node_modules/bootstrap-sass/assets/stylesheets', 'node_modules'],
+      precision,
+      sourceMap: true,
+      sourceMapContents: true
+    };
 
 /**
  * SCSS file compiler
diff --git a/lib/cssMin.js b/lib/cssMin.js
index 7fca0ca..a1d927d 100644
--- a/lib/cssMin.js
+++ b/lib/cssMin.js
@@ -2,6 +2,8 @@
 
 import CleanCSS from 'clean-css';
 
+const roundingPrecision = -1;
+
 /**
  * Minifies CSS
  *
@@ -17,7 +19,7 @@ export default function cssMin(data: Object): Object {
   const sourceMappingURL = data.code.match(/\n.+$/)[0],
       result = new CleanCSS({
         keepSpecialComments: 0,
-        roundingPrecision: -1,
+        roundingPrecision,
         sourceMap: data.map,
         sourceMapInlineSources: true
       }).minify(data.code);
diff --git a/lib/watch.js b/lib/watch.js
index 38722b4..182cc97 100644
--- a/lib/watch.js
+++ b/lib/watch.js
@@ -2,7 +2,8 @@
 
 import {Client} from 'fb-watchman';
 
-const client = new Client();
+const client = new Client(),
+    ALPHANUMERIC_BASE = 36;
 
 /**
  * Using the Facebook Watchman, watches the directory "dir" for changes of files with extension "type" and runs
@@ -20,7 +21,7 @@ const client = new Client();
  * watch(join(__dirname, 'src'), 'js', someFunction);
  */
 export default function watch(dir: string, type: string, callback: Function) {
-  const subscription = Number(Date.now()).toString(36);
+  const subscription = Number(Date.now()).toString(ALPHANUMERIC_BASE);
 
   client.capabilityCheck({}, function (capabilityErr) {
     if (capabilityErr) {
diff --git a/package.json b/package.json
index f3b73bf..b8705af 100644
--- a/package.json
+++ b/package.json
@@ -44,26 +44,26 @@
   "homepage": "https://thealjey.github.io/webcompiler",
   "dependencies": {
     "autoprefixer": "^6.0.3",
-    "babel": "^5.8.23",
-    "babel-core": "^5.8.25",
+    "babel": "^5.8.29",
+    "babel-core": "^5.8.29",
     "babel-eslint": "^4.1.3",
     "babel-loader": "^5.3.2",
-    "babel-runtime": "^5.8.25",
-    "clean-css": "^3.4.5",
-    "eslint": "^1.6.0",
+    "babel-runtime": "^5.8.29",
+    "clean-css": "^3.4.6",
+    "eslint": "^1.7.3",
     "eslint-config-airbnb": "^0.1.0",
     "eslint-plugin-babel": "^2.1.1",
     "eslint-plugin-lodash": "^0.1.4",
-    "eslint-plugin-react": "^3.5.0",
+    "eslint-plugin-react": "^3.6.3",
     "fb-watchman": "^1.6.0",
     "mkdirp": "^0.5.1",
-    "node-sass": "^3.3.3",
+    "node-sass": "^3.4.0",
     "node-sass-import-once": "^1.2.0",
-    "postcss": "^5.0.9",
+    "postcss": "^5.0.10",
     "tiny-lr": "^0.2.1",
     "uglify-js": "^2.5.0",
     "webpack": "^1.12.2",
-    "webpack-dev-server": "^1.12.0"
+    "webpack-dev-server": "^1.12.1"
   },
   "peerDependencies": {
     "babel-loader": "5.x",
@@ -71,12 +71,12 @@
     "react-hot-loader": "1.x"
   },
   "devDependencies": {
-    "babel-istanbul": "^0.3.20",
+    "babel-istanbul": "^0.4.0",
     "coveralls": "^2.11.4",
     "jasmine-es6": "^0.0.18",
     "jsdoc": "^3.3.3",
     "mt-changelog": "^0.6.2",
     "proxyquire": "^1.7.3",
-    "release-script": "^0.5.3"
+    "release-script": "^0.5.4"
   }
 }
diff --git a/spec/DevServerSpec.js b/spec/DevServerSpec.js
index bf633e9..24994e9 100644
--- a/spec/DevServerSpec.js
+++ b/spec/DevServerSpec.js
@@ -2,6 +2,10 @@
 
 import proxyquire from 'proxyquire';
 
+const DEFAULT_WEB_PORT = 3000,
+    WEB_PORT = 8000,
+    LIVERELOAD_PORT = 35729;
+
 class SASS {
 
   feDev(inPath: string, outPath: string, callback: Function) {
@@ -73,14 +77,14 @@ describe('DevServer', function () {
     beforeEach(function () {
       /* @noflow */
       cmp = new DevServer('/path/to/a/script/file.js', '/path/to/a/style/file.scss',
-                          '/path/to/the/development/directory', 8000, false);
+                          '/path/to/the/development/directory', WEB_PORT, false);
     });
 
     it('assigns a port number', function () {
       if (!cmp) {
         return;
       }
-      expect(cmp.port).toBe(8000);
+      expect(cmp.port).toBe(WEB_PORT);
     });
 
     it('constructs a LiveReload server instance', function () {
@@ -234,7 +238,7 @@ describe('DevServer', function () {
         if (!cmp) {
           return;
         }
-        expect(cmp.lr.listen).toHaveBeenCalledWith(35729);
+        expect(cmp.lr.listen).toHaveBeenCalledWith(LIVERELOAD_PORT);
       });
 
       it('compiles SASS on start up', function () {
@@ -269,7 +273,7 @@ describe('DevServer', function () {
         if (!cmp) {
           return;
         }
-        expect(cmp.server.listen).toHaveBeenCalledWith(3000, '0.0.0.0', jasmine.any(Function));
+        expect(cmp.server.listen).toHaveBeenCalledWith(DEFAULT_WEB_PORT, '0.0.0.0', jasmine.any(Function));
       });
 
       it('prints the error on screen', function () {
diff --git a/spec/JSLintSpec.js b/spec/JSLintSpec.js
index 6fa1fdd..7a37fef 100644
--- a/spec/JSLintSpec.js
+++ b/spec/JSLintSpec.js
@@ -3,6 +3,11 @@
 import JSLint from '../lib/JSLint';
 import {CLIEngine} from 'eslint';
 
+const MAX_COMPLEXITY = 4,
+    props = {complexity: [2, MAX_COMPLEXITY]},
+    line = 1,
+    column = 3;
+
 describe('JSLint', function () {
   let cmp;
 
@@ -13,9 +18,9 @@ describe('JSLint', function () {
   });
 
   it('should have easily configurable rules', function () {
-    cmp = new JSLint({complexity: [2, 4]});
+    cmp = new JSLint(props);
 
-    expect(cmp.linter.options.rules).toEqual(jasmine.objectContaining({complexity: [2, 4]}));
+    expect(cmp.linter.options.rules).toEqual(jasmine.objectContaining(props));
   });
 
   describe('when invoking run', function () {
@@ -46,12 +51,12 @@ describe('JSLint', function () {
         }
         spyOn(cmp.linter, 'executeOnFiles').and.returnValue({results: [
           {filePath: 'first file', messages: [
-            {message: 'error message', ruleId: 'some rule', line: 1, column: 3}
+            {message: 'error message', ruleId: 'some rule', line, column}
           ]}
         ]});
         cmp.run([], callback);
         expect(callback).toHaveBeenCalledWith([
-          {message: 'error message', ruleId: 'some rule', filePath: 'first file', line: 1, column: 3}
+          {message: 'error message', ruleId: 'some rule', filePath: 'first file', line, column}
         ]);
       });
 
diff --git a/spec/JSSpec.js b/spec/JSSpec.js
index cf16040..dc8f3d1 100644
--- a/spec/JSSpec.js
+++ b/spec/JSSpec.js
@@ -6,6 +6,14 @@ import JSLint from '../lib/JSLint';
 import zlib from 'zlib';
 import fs from 'fs';
 
+const ERROR_COUNT = 3,
+    LINE1 = 3,
+    COLUMN1 = 2,
+    LINE2 = 12,
+    COLUMN2 = 5,
+    MAX_COMPLEXITY = 4,
+    props = {complexity: [2, MAX_COMPLEXITY]};
+
 describe('JS', function () {
   let jsMin;
 
@@ -20,7 +28,7 @@ describe('JS', function () {
       JS = require('../lib/JS');
 
       /* @noflow */
-      cmp = new JS({complexity: [2, 4]});
+      cmp = new JS(props);
     });
 
     it('configures Flow', function () {
@@ -36,9 +44,7 @@ describe('JS', function () {
         return;
       }
       expect(cmp.linter).toEqual(jasmine.any(JSLint));
-      expect(cmp.linter.linter.options.rules).toEqual(jasmine.objectContaining({
-        complexity: [2, 4]
-      }));
+      expect(cmp.linter.linter.options.rules).toEqual(jasmine.objectContaining(props));
     });
 
   });
@@ -149,8 +155,8 @@ describe('JS', function () {
             }
             spyOn(cmp.linter, 'run').and.callFake(function (paths, callback) {
               callback([
-                {message: 'error message', ruleId: 'rule id', filePath: 'some file', line: 3, column: 2},
-                {message: 'error other message', filePath: 'some other file', line: 12, column: 5}
+                {message: 'error message', ruleId: 'rule id', filePath: 'some file', line: LINE1, column: COLUMN1},
+                {message: 'error other message', filePath: 'some other file', line: LINE2, column: COLUMN2}
               ]);
             });
             cmp.validate('/path/to/a/file.js', ['/lint/this/directory/too'], spy);
@@ -167,10 +173,10 @@ describe('JS', function () {
           it('logs the error to console', function () {
             expect(console.log).toHaveBeenCalledWith(
               '\x1b[41mESLint error\x1b[0m "\x1b[33m%s%s\x1b[0m" in \x1b[36m%s\x1b[0m on \x1b[35m%s:%s\x1b[0m',
-              'error message', ' (rule id)', 'some file', 3, 2);
+              'error message', ' (rule id)', 'some file', LINE1, COLUMN1);
             expect(console.log).toHaveBeenCalledWith(
               '\x1b[41mESLint error\x1b[0m "\x1b[33m%s%s\x1b[0m" in \x1b[36m%s\x1b[0m on \x1b[35m%s:%s\x1b[0m',
-              'error other message', '', 'some other file', 12, 5);
+              'error other message', '', 'some other file', LINE2, COLUMN2);
           });
 
           it('does not invoke the callback', function () {
@@ -249,7 +255,7 @@ describe('JS', function () {
       });
 
       it('does not log the successful message', function () {
-        expect(console.log).toHaveBeenCalledWith('JavaScript compilation errors: %s', 3);
+        expect(console.log).toHaveBeenCalledWith('JavaScript compilation errors: %s', ERROR_COUNT);
         expect(console.log).not.toHaveBeenCalledWith('\x1b[32m%s. Compiled %s\x1b[0m', 1, '/path/to/the/input/file.js');
       });
 
diff --git a/spec/SASSCompileSpec.js b/spec/SASSCompileSpec.js
index e7e23c4..515ff7d 100644
--- a/spec/SASSCompileSpec.js
+++ b/spec/SASSCompileSpec.js
@@ -4,6 +4,8 @@ import SASSCompile from '../lib/SASSCompile';
 import sass from 'node-sass';
 import importer from 'node-sass-import-once';
 
+const precision = 8;
+
 describe('SASSCompile', function () {
 
   describe('no overrides', function () {
@@ -47,7 +49,7 @@ describe('SASSCompile', function () {
           importer,
           importOnce: {index: true, css: false, bower: false, something: 'here'},
           includePaths: ['node_modules/bootstrap-sass/assets/stylesheets', 'node_modules', '/path/to/some/directory'],
-          precision: 8,
+          precision,
           sourceMap: true,
           sourceMapContents: true
         }, jasmine.any(Function));
diff --git a/spec/SASSSpec.js b/spec/SASSSpec.js
index d3fa257..13fccc7 100644
--- a/spec/SASSSpec.js
+++ b/spec/SASSSpec.js
@@ -6,6 +6,10 @@ import SASSCompile from '../lib/SASSCompile';
 import zlib from 'zlib';
 import fs from 'fs';
 
+const ERROR_COUNT = 3,
+    line = 12,
+    column = 8;
+
 describe('SASS', function () {
   let cssMin;
 
@@ -255,7 +259,7 @@ describe('SASS', function () {
             return;
           }
           spyOn(cmp.compiler, 'run').and.callFake(function (inPath, outPath, callback) {
-            callback({message: 'could not compile', file: 'some file', line: 12, column: 8});
+            callback({message: 'could not compile', file: 'some file', line, column});
           });
           cmp.webCompile('/path/to/the/input/file.scss', '/path/to/the/output/file.css', Function.prototype);
         });
@@ -271,7 +275,7 @@ describe('SASS', function () {
         it('prints the error', function () {
           expect(console.log).toHaveBeenCalledWith(
             '\x1b[41mSASS error\x1b[0m "\x1b[33m%s\x1b[0m" in \x1b[36m%s\x1b[0m on \x1b[35m%s:%s\x1b[0m',
-            'could not compile', 'some file', 12, 8);
+            'could not compile', 'some file', line, column);
         });
 
         it('does not call cssAutoprefix', function () {
@@ -302,7 +306,7 @@ describe('SASS', function () {
           expect(console.error).toHaveBeenCalledWith('something');
           expect(console.error).toHaveBeenCalledWith('bad');
           expect(console.error).toHaveBeenCalledWith('happened');
-          expect(console.log).toHaveBeenCalledWith('CSS auto-prefix errors: %s', 3);
+          expect(console.log).toHaveBeenCalledWith('CSS auto-prefix errors: %s', ERROR_COUNT);
         });
 
         it('does not invoke the callback', function () {
diff --git a/spec/cssMinSpec.js b/spec/cssMinSpec.js
index 1c012a1..b7651d9 100644
--- a/spec/cssMinSpec.js
+++ b/spec/cssMinSpec.js
@@ -2,6 +2,8 @@
 
 import proxyquire from 'proxyquire';
 
+const roundingPrecision = -1;
+
 let options;
 
 class CleanCSS {
@@ -28,7 +30,7 @@ describe('cssMin', function () {
     result = cssMin({code: "some css rules\nlast line", map: 'source map contents'});
     expect(options).toEqual({
       keepSpecialComments: 0,
-      roundingPrecision: -1,
+      roundingPrecision,
       sourceMap: 'source map contents',
       sourceMapInlineSources: true
     });
diff --git a/spec/watchSpec.js b/spec/watchSpec.js
index 583d1c5..4b7dafb 100644
--- a/spec/watchSpec.js
+++ b/spec/watchSpec.js
@@ -2,6 +2,8 @@
 
 import proxyquire from 'proxyquire';
 
+const ALPHANUMERIC_BASE = 36;
+
 class Client {
 
   capabilityCheck() {}
@@ -21,7 +23,7 @@ describe('watch', function () {
       cb();
     });
     callback = jasmine.createSpy('callback');
-    spyOn(Date, 'now').and.returnValue(5);
+    spyOn(Date, 'now');
     spyOn(Number.prototype, 'toString').and.returnValue('qwerty');
     spyOn(console, 'log');
     spyOn(console, 'error');
@@ -40,7 +42,7 @@ describe('watch', function () {
       return;
     }
     watch('qwe', 'rty', Function.prototype);
-    expect(Number.prototype.toString).toHaveBeenCalledWith(36);
+    expect(Number.prototype.toString).toHaveBeenCalledWith(ALPHANUMERIC_BASE);
   });
 
   describe('capabilityCheck error', function () {