[webpack-cli]: Invalid configuration object

Получаю ошибку:

[webpack-cli] Invalid configuration object. Webpack has been initialized using a configuration object that does not match the API schema.

• configuration.devtool should match pattern "^(inline-|hidden-|eval-)?(nosources-)?(cheap-(module-)?)?source-map$". BREAKING CHANGE since webpack 5: The devtool option is more strict.
  Please strictly follow the order of the keywords in the pattern.

В webpack не разбираюсь, но хочу понять как он работает. Вот мой конфигурационный файл:

module.exports = {
    entry: './src/index.js',
    output: {
        path: __dirname + '/dist',
        publicPath: '/',
        filename: 'bundle.js',
    },
    devServer: {
        contentBase: './',
        publicPath: '/dist/'
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                exclude: /node_modules/,
                use: ['babel-loader']
            }
        ]
    },
};