diff --git a/.travis.yml b/.travis.yml
index dc2df6866b16..e4642d2c0571 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -48,7 +48,7 @@ install:
   - npm config set loglevel http
   - npm install -g npm@2.5
   # Instal npm dependecies and ensure that npm cache is not stale
-  - scripts/npm/install-dependencies.sh
+  - npm install
 
 before_script:
   - mkdir -p $LOGS_DIR
diff --git a/Gruntfile.js b/Gruntfile.js
index 53aaf59a9ad6..018f08b16f1c 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -305,7 +305,7 @@ module.exports = function(grunt) {
 
     shell: {
       "npm-install": {
-        command: path.normalize('scripts/npm/install-dependencies.sh')
+        command: 'node scripts/npm/check-node-modules.js'
       },
 
       "promises-aplus-tests": {
diff --git a/package.json b/package.json
index 4168a8384d1a..6a4fa39ca179 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,10 @@
     "npm": "~2.5"
   },
   "engineStrict": true,
+  "scripts": {
+    "preinstall": "node scripts/npm/check-node-modules.js --purge",
+    "postinstall": "node scripts/npm/copy-npm-shrinkwrap.js"
+  },
   "devDependencies": {
     "angular-benchpress": "0.x.x",
     "benchmark": "1.x.x",
diff --git a/scripts/npm/check-node-modules.js b/scripts/npm/check-node-modules.js
new file mode 100644
index 000000000000..a9bc24a9a593
--- /dev/null
+++ b/scripts/npm/check-node-modules.js
@@ -0,0 +1,74 @@
+// Implementation based on:
+// https://github.com/angular/angular/blob/3b9c08676a4c921bbfa847802e08566fb601ba7a/tools/npm/check-node-modules.js
+'use strict';
+
+// Imports
+var fs = require('fs');
+var path = require('path');
+
+// Constants
+var PROJECT_ROOT = path.join(__dirname, '../../');
+var NODE_MODULES_DIR = 'node_modules';
+var NPM_SHRINKWRAP_FILE = 'npm-shrinkwrap.json';
+var NPM_SHRINKWRAP_CACHED_FILE = NODE_MODULES_DIR + '/npm-shrinkwrap.cached.json';
+
+// Run
+_main();
+
+// Functions - Definitions
+function _main() {
+  var purgeIfStale = process.argv.indexOf('--purge') !== -1;
+
+  process.chdir(PROJECT_ROOT);
+  checkNodeModules(purgeIfStale);
+}
+
+function checkNodeModules(purgeIfStale) {
+  var nodeModulesOk = compareMarkerFiles(NPM_SHRINKWRAP_FILE, NPM_SHRINKWRAP_CACHED_FILE);
+
+  if (nodeModulesOk) {
+    console.log(':-) npm dependencies are looking good!');
+  } else if (purgeIfStale) {
+    console.log(':-( npm dependencies are stale or in an unknown state!');
+    console.log('    Purging \'' + NODE_MODULES_DIR + '\'...');
+    deleteDirSync(NODE_MODULES_DIR);
+  } else {
+    var separator = new Array(81).join('!');
+
+    console.warn(separator);
+    console.warn(':-( npm dependencies are stale or in an unknown state!');
+    console.warn('You can rebuild the dependencies by running `npm install`.');
+    console.warn(separator);
+  }
+
+  return nodeModulesOk;
+}
+
+function compareMarkerFiles(markerFilePath, cachedMarkerFilePath) {
+  if (!fs.existsSync(cachedMarkerFilePath)) return false;
+
+  var opts = {encoding: 'utf-8'};
+  var markerContent = fs.readFileSync(markerFilePath, opts);
+  var cachedMarkerContent = fs.readFileSync(cachedMarkerFilePath, opts);
+
+  return markerContent === cachedMarkerContent;
+}
+
+// Custom implementation of `rm -rf` that works consistently across OSes
+function deleteDirSync(path) {
+  if (fs.existsSync(path)) {
+    fs.readdirSync(path).forEach(deleteDirOrFileSync);
+    fs.rmdirSync(path);
+  }
+
+  // Helpers
+  function deleteDirOrFileSync(subpath) {
+    var curPath = path + '/' + subpath;
+
+    if (fs.lstatSync(curPath).isDirectory()) {
+      deleteDirSync(curPath);
+    } else {
+      fs.unlinkSync(curPath);
+    }
+  }
+}
diff --git a/scripts/npm/copy-npm-shrinkwrap.js b/scripts/npm/copy-npm-shrinkwrap.js
new file mode 100644
index 000000000000..78bfe3baaafa
--- /dev/null
+++ b/scripts/npm/copy-npm-shrinkwrap.js
@@ -0,0 +1,60 @@
+'use strict';
+
+// Imports
+var fs = require('fs');
+var path = require('path');
+
+// Constants
+var PROJECT_ROOT = path.join(__dirname, '../../');
+var NODE_MODULES_DIR = 'node_modules';
+var NPM_SHRINKWRAP_FILE = 'npm-shrinkwrap.json';
+var NPM_SHRINKWRAP_CACHED_FILE = NODE_MODULES_DIR + '/npm-shrinkwrap.cached.json';
+
+// Run
+_main();
+
+// Functions - Definitions
+function _main() {
+  process.chdir(PROJECT_ROOT);
+  copyFile(NPM_SHRINKWRAP_FILE, NPM_SHRINKWRAP_CACHED_FILE, onCopied);
+}
+
+// Implementation based on:
+// https://stackoverflow.com/questions/11293857/fastest-way-to-copy-file-in-node-js#answer-21995878
+function copyFile(srcPath, dstPath, callback) {
+  var callbackCalled = false;
+
+  if (!fs.existsSync(srcPath)) {
+    done(new Error('Missing source file: ' + srcPath));
+    return;
+  }
+
+  var rs = fs.createReadStream(srcPath);
+  rs.on('error', done);
+
+  var ws = fs.createWriteStream(dstPath);
+  ws.on('error', done);
+  ws.on('finish', done);
+
+  rs.pipe(ws);
+
+  // Helpers
+  function done(err) {
+    if (callback && !callbackCalled) {
+      callbackCalled = true;
+      callback(err);
+    }
+  }
+}
+
+function onCopied(err) {
+  if (err) {
+    var separator = new Array(81).join('!');
+
+    console.error(separator);
+    console.error(
+        'Failed to copy `' + NPM_SHRINKWRAP_FILE + '` to `' + NPM_SHRINKWRAP_CACHED_FILE + '`:');
+    console.error(err);
+    console.error(separator);
+  }
+}
diff --git a/scripts/npm/install-dependencies.sh b/scripts/npm/install-dependencies.sh
deleted file mode 100755
index 1851d4ea6ae4..000000000000
--- a/scripts/npm/install-dependencies.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/bash
-
-set -e
-
-SHRINKWRAP_FILE=npm-shrinkwrap.json
-SHRINKWRAP_CACHED_FILE=node_modules/npm-shrinkwrap.cached.json
-
-if diff -q $SHRINKWRAP_FILE $SHRINKWRAP_CACHED_FILE; then
-  echo 'No shrinkwrap changes detected. npm install will be skipped...';
-else
-  echo 'Blowing away node_modules and reinstalling npm dependencies...'
-  rm -rf node_modules
-  npm install
-  cp $SHRINKWRAP_FILE $SHRINKWRAP_CACHED_FILE
-  echo 'npm install successful!'
-fi