Create 3rd party libraries with node instead of Python.

package-lock.json

@@ -526,6 +526,23 @@
                 "typedarray": "^0.0.6"
             }
         },
+        "concat-with-sourcemaps": {
+            "version": "1.1.0",
+            "resolved": "https://registry.npmjs.org/concat-with-sourcemaps/-/concat-with-sourcemaps-1.1.0.tgz",
+            "integrity": "sha512-4gEjHJFT9e+2W/77h/DS5SGUgwDaOwprX8L/gl5+3ixnzkVJJsZWDSelmN3Oilw3LNDZjZV0yqH1hLG3k6nghg==",
+            "dev": true,
+            "requires": {
+                "source-map": "^0.6.1"
+            },
+            "dependencies": {
+                "source-map": {
+                    "version": "0.6.1",
+                    "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+                    "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+                    "dev": true
+                }
+            }
+        },
         "convert-source-map": {
             "version": "1.6.0",
             "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.6.0.tgz",
@@ -1735,6 +1752,17 @@
                 }
             }
         },
+        "gulp-concat": {
+            "version": "2.6.1",
+            "resolved": "https://registry.npmjs.org/gulp-concat/-/gulp-concat-2.6.1.tgz",
+            "integrity": "sha1-Yz0WyV2IUEYorQJmVmPO5aR5M1M=",
+            "dev": true,
+            "requires": {
+                "concat-with-sourcemaps": "^1.0.0",
+                "through2": "^2.0.0",
+                "vinyl": "^2.0.0"
+            }
+        },
         "gulp-rename": {
             "version": "1.4.0",
             "resolved": "https://registry.npmjs.org/gulp-rename/-/gulp-rename-1.4.0.tgz",