first commit

webpack.config.dev.js

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+const { merge } = require('webpack-merge');
+const common = require('./webpack.common.js');
+
+module.exports = merge(common, {
+  mode: 'development',
+  devtool: 'inline-source-map',
+  devServer: {
+    liveReload: true,
+    hot: true,
+    open: true,
+    static: ['./'],
+  },
+});