interface preopens {
  use wasi:filesystem/types.{descriptor}
  use wasi:io/streams.{input-stream, output-stream}

  /// Return the set of of preopened directories, and their path.
  get-directories: func() -> list<tuple<descriptor, string>>

  /// Return a path that programs should use as their initial current working
  /// directory, interpreting `.` as shorthand for this.
  initial-cwd: func() -> option<string>
}