fastify settings for SPA serve

server.js

const fastify = require('fastify')()
const path = require('path')

fastify.register(require('fastify-static'), {
    root: path.join(__dirname, 'dist'),
})

fastify.setNotFoundHandler(function (request, reply) {
    reply.sendFile('index.html')
})

// Run the server!
fastify.listen(4000, function (err, address) {
    if (err) {
        fastify.log.error(err)
        process.exit(1)
    }
    fastify.log.info(`server listening on ${address}`)
})