webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

const merge = require('webpack-merge');

const validate = require('webpack-validator');

const parts = require('./libs/parts');

const PATHS = {
    app:path.join(__dirname, 'app'),
    build:path.join(__dirname, 'build')
};

const common = {
    entry :{
        app:PATHS.app
    },
    output:{
        path:PATHS.build,
        filename:'[name].js'
    },
    plugins:[
        new HtmlWebpackPlugin({
            title:'Webpack demo'
        })
        
    ]
};

var config;

switch(process.env.npm_lifecycle_event){
    case 'build':
        config = merge(common,{});
        break;
    default:
        config = merge(
            common,
            parts.devServer({
                host:process.env.HOST,
                port:process.env.PORT
            })
        );
}

module.exports =  validate(config);