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node_modules/core-js-pure/internals/collection-from.js

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+'use strict';
+// https://tc39.github.io/proposal-setmap-offrom/
+var bind = require('../internals/function-bind-context');
+var anObject = require('../internals/an-object');
+var toObject = require('../internals/to-object');
+var iterate = require('../internals/iterate');
+
+module.exports = function (C, adder, ENTRY) {
+  return function from(source /* , mapFn, thisArg */) {
+    var O = toObject(source);
+    var length = arguments.length;
+    var mapFn = length > 1 ? arguments[1] : undefined;
+    var mapping = mapFn !== undefined;
+    var boundFunction = mapping ? bind(mapFn, length > 2 ? arguments[2] : undefined) : undefined;
+    var result = new C();
+    var n = 0;
+    iterate(O, function (nextItem) {
+      var entry = mapping ? boundFunction(nextItem, n++) : nextItem;
+      if (ENTRY) adder(result, anObject(entry)[0], entry[1]);
+      else adder(result, entry);
+    });
+    return result;
+  };
+};