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Webpack - Webpack5 Migration Note

* eslint-loader                       -> eslint-webpack-plugin
* optimize-css-assets-webpack-plugin  -> css-minimizer-webpack-plugin
* terser-webpack-plugin               -> Removed
* webpack-deep-scope-plugin           -> Removed
* html-minimizer-webpack-plugin       -> New Added
* json-minimizer-webpack-plugin       -> New Added
webpack.dev.js
- const merge = require('webpack-merge');
+ const { merge } = require('webpack-merge');

- devtool: '#eval-source-map',
+ devtool: 'eval-source-map',

webpack.prod.js
- const merge = require('webpack-merge');
+ const { merge } = require('webpack-merge');

- devtool: '#source-map',
+ devtool: 'source-map',
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