fix(pkg): only run patch-package in dev

Author: buschtoens

package.json

@@ -20,7 +20,7 @@
     "start": "ember serve",
     "test": "ember test",
     "test:all": "ember try:each",
-    "postinstall": "patch-package",
+    "postinstall": "node ./postinstall.js",
     "prepublishOnly": "ember ts:precompile",
     "postpublish": "ember ts:clean"
   },

postinstall.js

@@ -0,0 +1,7 @@
+/* eslint-env node */
+
+if (require('fs').existsSync('./ember-cli-build.js')) {
+  const patchPackage = require('child_process').exec('patch-package');
+  patchPackage.stdout.pipe(process.stdout);
+  patchPackage.stderr.pipe(process.stderr);
+}