netlify.toml

[build]
  # Directory (relative to root of your repo) that contains the deploy-ready
  # HTML files and assets generated by the build. If a base directory has
  # been specified, include it in the publish directory path.
  publish = "out"

  # Default build command.
  command = "npm run build && npx next export"

  environment = { NODE_VERSION = "12.13.1" }