So siehts ganz gut aus !

node_modules/core-js/modules/core.function.part.js

@@ -0,0 +1,7 @@
+var path = require('./_path');
+var $export = require('./_export');
+
+// Placeholder
+require('./_core')._ = path._ = path._ || {};
+
+$export($export.P + $export.F, 'Function', { part: require('./_partial') });