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ES6(esnext/es2015)をbabelでコンパイルした時にSymbol is not definedになった場合の対処法

ES2015のfor ... ofループをbabelでコンパイルすると Symbol.Iteratorになるのですが
古いnode.jsのバージョンやIEでは対応してないのでエラーになります。

その場合はbabel-polyfillを使うことで対処できます。

$ npm install babel-polyfill
index.js
require("babel-polyfill"); // or import "babel-polyfill";
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