Why doesn't liveReload work in webpack 4?

Question

webpack

Hello. LiveReload does not fire when changing style and markup files.
package.json:

{
"devDependencies": {
"@babel/core": "^7.5.0",
"autoprefixer": "^9.6.1",
"babel-loader": "^8.0.6",
"babel-preset-env ": "^1.7.0",
"css-loader": "^3.0.0",
"html-webpack-plugin": "^3.2.0",
"mini-css-extract-plugin": "^0.7 .0",
"node-sass": "^4.12.0",
"postcss-loader": "^3.0.0",
"pug": "^2.0.4",
"pug-loader": "^2.4 .0",
"sass-loader": "^7.1.0",
"style-loader": "^0.23.1",
"webpack": "^4.35.2",
"webpack-cli": "^3.3.5",
"webpack-dev-server": "^3.7.2"
}
}

webpack.config.js:

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
module.exports = {
entry: './src/autoload.js',
output: {
filename: 'bundle.js',
path: path.resolve(__dirname, 'dist')
},
module: {
rules: [
{
test : /\.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader'
}
},
{
test: /\.(sa|sc|c)ss$/,
use: [
'style- loader',
{
loader: MiniCssExtractPlugin.
'css-loader',
'postcss-loader',
'sass-loader'
]
},
{
test: /\.pug$/,
loader: 'pug-loader'
}
]
},
plugins: [
new MiniCssExtractPlugin({
filename: '[name].css',
chunkFilename: '[id].css',
}),
new HtmlWebpackPlugin({
inject: false,
template: './src/pages/index.pug'
})
]
}