inside

webpack.config.js

const path = require('path');
const webpack = require('webpack');
const VueLoaderPlugin = require('vue-loader/lib/plugin');

module.exports = {
    entry: {
        hoge: './src/main/js/files/hoge',
        vendor: ['vue', 'vuex']
    },
    output: {
        path: path.resolve(__dirname, 'build', 'classes', 'java', 'main', 'static', 'js'),
        publicPath: '/js/',
        filename: '[name].js'
    },
    module: {
        rules: [
            {
                test: /\.vue$/,
                loader: 'vue-loader',
            },
            {
                test: /\.(css|sass|scss)$/,
                use: [
                    'vue-style-loader',
                    'css-loader',
                    'sass-loader'
                ]
            },
            {
                test: /\.js$/,
                loader: 'babel-loader',
                options: {
                    presets: [
                        '@babel/preset-env',
                    ]
                }
            }
        ]
    },
    optimization: {
        splitChunks: {
            name: 'vendor',
            chunks: 'initial',
        }
    },
    plugins: [
        new VueLoaderPlugin()
    ]
};