So siehts ganz gut aus !

node_modules/core-js/modules/_set-collection-from.js

@@ -0,0 +1,28 @@
+'use strict';
+// https://tc39.github.io/proposal-setmap-offrom/
+var $export = require('./_export');
+var aFunction = require('./_a-function');
+var ctx = require('./_ctx');
+var forOf = require('./_for-of');
+
+module.exports = function (COLLECTION) {
+  $export($export.S, COLLECTION, { from: function from(source /* , mapFn, thisArg */) {
+    var mapFn = arguments[1];
+    var mapping, A, n, cb;
+    aFunction(this);
+    mapping = mapFn !== undefined;
+    if (mapping) aFunction(mapFn);
+    if (source == undefined) return new this();
+    A = [];
+    if (mapping) {
+      n = 0;
+      cb = ctx(mapFn, arguments[2], 2);
+      forOf(source, false, function (nextItem) {
+        A.push(cb(nextItem, n++));
+      });
+    } else {
+      forOf(source, false, A.push, A);
+    }
+    return new this(A);
+  } });
+};