bitwarden-browser/webpack.dev.js

const merge = require('webpack-merge');
const common = require('./webpack.common.js');

module.exports = merge(common, {
    devtool: 'inline-source-map',
    module: {
        rules: [
            {
                test: /\.less$/,
                use: [
                    {
                        loader: 'style-loader'
                    },
                    {
                        loader: 'css-loader',
                    },
                    {
                        loader: 'less-loader',
                    }
                ]
            }
        ]
    }
});