Ensure function declarations at the block level are block scoped
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npm install --save-dev babel-plugin-transform-es2015-block-scoped-functions
.babelrc
(Recommended).babelrc
{
"plugins": ["transform-es2015-block-scoped-functions"]
}
babel --plugins transform-es2015-block-scoped-functions script.js
require("babel-core").transform("code", {
plugins: ["transform-es2015-block-scoped-functions"]
});