chore(rollup): suppress few warnings

Author: kamilkisiela

rollup.config.js

@@ -3,6 +3,7 @@ export default {
   dest: 'build/bundles/apollo.umd.js',
   format: 'umd',
   moduleName: 'ng.apollo',
+  onwarn,
   globals: {
     '@angular/core': 'ng.core',
     'rxjs/Observable': 'Rx',
@@ -12,3 +13,14 @@ export default {
     'apollo-client': 'apollo',
   }
 }
+
+function onwarn(message) {
+  const suppressed = [
+    'UNRESOLVED_IMPORT',
+    'THIS_IS_UNDEFINED'
+  ];
+
+  if (!suppressed.find(code => message.code === code)) {
+    return console.warn(message.message);
+  }
+}