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var a = 2;
{
  let a = 3;
  document.write(a); // 3
}
document.write('<br>');
document.write(a); // 2

$ node
> let sitename="tutorialpro"
undefined
> console.log(sitename)
tutorialpro
undefined
>

node --v8-options | grep harmony

const config = {
  entry: "./src/main.js"
}

const config = {
  app: "./src/main.js",
  vendors: "./src/vendors.js"
}

const config = {
  entry: "./src/main.js",
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, 'dist')
  }
}

const config = {
  entry: "./src/main.js",
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, 'dist')
  },
  module: {
    rules: [
      {
          test: /\.js$/,
          exclude: /node_modules/,
          loader: "babel-loader",
          options: [
            presets: ["env"]
          ]
      }
    ]
  }
}

// Install via npm
const HtmlWebpackPlugin = require('html-webpack-plugin');
// Access built-in plugins
const webpack = require('webpack'); 

const config = {
  module: {
    rules: [
      {
          test: /\.js$/,
          exclude: /node_modules/,
          loader: "babel-loader"
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({template: './src/index.html'})
  ]
};