Avoid writing optional dependencies to shrinkwrap

npm-shrinkwrap.json

@@ -39,12 +39,6 @@
       "from": "align-text@>=0.1.3 <0.2.0",
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz"
     },
-    "amdefine": {
-      "version": "1.0.1",
-      "from": "amdefine@>=0.0.4",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "optional": true
-    },
     "ansi-regex": {
       "version": "2.1.1",
       "from": "ansi-regex@>=2.0.0 <3.0.0",
@@ -709,12 +703,6 @@
           "version": "1.0.4",
           "from": "esprima@>=1.0.4 <1.1.0",
           "resolved": "https://registry.npmjs.org/esprima/-/esprima-1.0.4.tgz"
-        },
-        "source-map": {
-          "version": "0.1.43",
-          "from": "source-map@>=0.1.30 <0.2.0",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.1.43.tgz",
-          "optional": true
         }
       }
     },
@@ -2035,12 +2023,6 @@
             }
           }
         },
-        "source-map": {
-          "version": "0.1.43",
-          "from": "source-map@>=0.1.33 <0.2.0",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.1.43.tgz",
-          "optional": true
-        },
         "string_decoder": {
           "version": "1.0.3",
           "from": "string_decoder@>=1.0.3 <1.1.0",
@@ -2235,12 +2217,6 @@
       "from": "uglify-js@>=3.1.0 <3.2.0",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.1.3.tgz"
     },
-    "uglify-to-browserify": {
-      "version": "1.0.2",
-      "from": "uglify-to-browserify@>=1.0.0 <1.1.0",
-      "resolved": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz",
-      "optional": true
-    },
     "umd": {
       "version": "3.0.1",
       "from": "umd@>=3.0.0 <4.0.0",

package.json

@@ -145,7 +145,7 @@
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "postversion": "git push origin master --follow-tags",
-    "update-internal-deps": "rm -rf node_modules && npm install --production --no-shrinkwrap && npm dedupe && npm prune && npm shrinkwrap && npm run fix-shrinkwrap-protocol && npm install",
+    "update-internal-deps": "rm -rf node_modules && npm install --production --no-optional --no-shrinkwrap && npm dedupe && npm prune && npm shrinkwrap && npm run fix-shrinkwrap-protocol && npm install",
     "branch-files": "node lib/build/branchFiles/branchFiles.js",
     "affected_specs": "node lib/build/branchFiles/branchFiles.js | xargs node lib/build/affectedFiles/affectedFiles.js",
     "build": "NODE_ENV=production webpack --config webpack.prod.config.js",