#Modules and exports

Modules are .rts files and they are imported with @use.

• module <name> declares the module name (required when importing without as, and it must be the first statement).
• export exposes a name from a module.
• @use ./path.rts or @use ./path.rts as alias imports a module into a request or file.
• If you omit as, the module name becomes the alias.
• Modules are cached, so top level mutable state can persist across runs.

Example:

// helpers.rts
module helpers
export fn authHeader(token) {
  return token ? "Bearer " + token : ""
}

# @use ./rts/helpers.rts
Authorization: {{= helpers.authHeader(vars.get("auth.token")) }}

Modules run with rts only. The request object is available when the host provides it, but env, vars, last, response, trace, and stream are not. Pass values in as arguments when you need extra context. stdlib remains available as a deprecated alias.