Getting an error while trying to run build - reactjs

Question

I am not able run my React Application using webpack. I am stuck with an error which I am unable to understand.
I am getting the following error on my terminal while trying to run the build:
The syntax of the command is incorrect.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! reactjs-basics#1.0.0 build: webpack -d && copy src/index.html dist/index.html && webpack-dev-server --content-base
src/ --inline --hot
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the reactjs-basics#1.0.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Pratik\AppData\Roaming\npm-cache_logs\2018-05-06T07_21_12_207Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! reactjs-basics#1.0.0 start: npm run build
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the reactjs-basics#1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Pratik\AppData\Roaming\npm-cache_logs\2018-05-06T07_21_12_256Z-debug.log
Package.json file is as below:
{
"name": "reactjs-basics",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "npm run build",
"build": "webpack -d && copy src/index.html dist/index.html && webpack-dev-server --content-base src/ --inline --hot",
"build:prod": "webpack -p && copy src/index.html dist/index.html"
},
"keywords": [
"reactjs"
],
"author": "Pratik Basak",
"license": "ISC",
"devDependencies": {
"babel-loader": "^7.1.4",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"babel-preset-stage-2": "^6.24.1",
"react": "^16.3.2",
"react-dom": "^16.3.2",
"webpack": "^4.7.0",
"webpack-cli": "^2.1.2",
"webpack-dev-server": "^3.1.4"
}
}
webpack.config.js file is as follows:
const webpack = require('webpack');
const path = require('path');
const DIST_DIR = path.resolve(__dirname, 'dist');
const SRC_DIR = path.resolve(__dirname, 'src');
var config = {
entry: SRC_DIR + '/app/index.js',
output: {
path: DIST_DIR + '/app',
filename: 'bundle.js',
publicPath: '/app/'
},
module: {
rules: [
{
test: /\.js?/,
include: SRC_DIR,
loader: 'babel-loader',
query: {
presets: ['react', 'es2015', 'stage-2']
}
}
]
}
};
module.exports = config;