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// server.js

const { createServer } = require('http');
const next = require('next');
const { promises, existsSync  } = require('fs');

const dev = (process.env.NODE_ENV || '').indexOf('production') === -1;

const app = next({ dev });
const handle = app.getRequestHandler();

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"scripts": {
  "dev": "node server.js",
  "build": "next build",
  "start": "NODE_ENV=production node server.js"
}

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import { useRouter } from 'next/router'
import Head from 'next/head'

export default function Fact({ fact }) {
    const router = useRouter()
    return (
        <div style={{ textAlign: 'center' }}>
            <h1>A fact about cat</h1>
            <br/>
            <p>{fact}</p>

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const Product = (props) => {
    return <div>
     { props.data.map(p => <div key={p.id}>{p.name}</div>) }
    </div>
}

export const getServerSideProps = async (context) => {
    const {name} = context.query
    //you can fetch data from your api like this
    // const res = await 

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//...

<Link href={'/products/potato'}> 
    <button>Potato</button>
</Link>

//...

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//...

<Link href={`/loading/product?name=potato`}> 
    <button>Potato</button>
</Link>

//...

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//...

const {name} = router.query;

React.useEffect(() => {
    router.replace(`/products/${name}`);
})

//...

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//...

const [steep, setSteep] = useState<number>(0);

//...

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//inside the parent of carousel Dialog
const [dialogOpen, setDialogOpen] = useState<number>(0);



//inside a carousel Dialog
const [steep, setSteep] = useState<number>(0);

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import {useRouter} from "next/router";


//...


const router = useRouter();
const {router_steep} = router.query
const steep = (isNaN(+router_steep) || +router_steep < 0) ? 0 
                  : +router_steep;