server.ts

/* eslint-disable @typescript-eslint/no-var-requires */
const express = require('express')
const handler = require('serve-handler')
const prerender = require('prerender-node')

console.log(
  `ENV VAR CHECK:\n\tPORT: ${
    process.env.PORT
  }\nPRERENDER_TOKEN: not null -> ${Boolean(process.env.PRERENDER_TOKEN)}`,
)

const PORT = process.env.PORT || 3000
const app = express()

app.use(
  prerender
    .set('prerenderToken', process.env.PRERENDER_TOKEN)
    .set('afterRender', (err) => {
      // If the request to prerender server fails, just return the normal static files.
      if (err) {
        console.error('Prerender Error', err)
        return { cancelRender: true }
      }
    }),
)

app.use((request, response) => {
  return handler(request, response, {
    public: './dist',
    rewrites: [{ source: '*', destination: '/index.html' }],
  })
})

app.listen(PORT, () => {
  console.log(`Geyser app listening on port ${PORT}`)
})