Simple robots.txt generation for Sapper

process.env.robotsTxt

{
  UserAgent: '*',
  Disallow: '/'
}

robots.txt.js

// Lives in routes/robots.txt.js

const robots = process.env.robotsTxt

export function get (req, res) {
	res.setHeader('Content-Type', 'text/plain')

  const content = Object.keys(robots)
  .reduce((acc, next) => {
    return acc += `${next}: ${robots[next]}\n`
  }, '')

	res.end(content)
}

can we simply create file /static/robots.txt ?

if you don't have any dynamic content in it, yes