chore(check-node-modules): make check/reinstall node_modules work across platforms

The previous implementations (based on shell scripts) threw errors on
Windows, because it was not able to `rm -rf` 'node_modules' (due to the
255 character limit in file-paths).

This implementation works consistently across platforms and is heavily based on
'https://github.com/angular/angular/blob/3b9c08676a4c921bbfa847802e08566fb601ba7a/tools/npm/check-node-modules.js'.

Fixes #11143
Closes #11353

Closes #12792

Author: gkalpak

.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

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": {

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",

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);
+    }
+  }
+}

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);
+  }
+}