Webpack 4, this.htmlWebpackPlugin.getHooks is not a function

There was an update to the thread that Bruce linked. As explained by adambreznicky to fix the issue one should:

1. delete old node_modules and reinstall fresh
2. npm i --save-dev html-webpack-plugin@next
3. modify new InterpolateHtmlPlugin(env.raw) to new InterpolateHtmlPlugin(HtmlWebpackPlugin, env.raw)