union Any {
  Read,
  ReadRes,
  Seek,
  Write,
  WriteRes,
}

enum ErrorKind: byte {
  NoError = 0,

  // io errors

  NotFound,
  PermissionDenied,
  ConnectionRefused,
  ConnectionReset,
  ConnectionAborted,
  NotConnected,
  AddrInUse,
  AddrNotAvailable,
  BrokenPipe,
  AlreadyExists,
  WouldBlock,
  InvalidInput,
  InvalidData,
  TimedOut,
  Interrupted,
  WriteZero,
  Other,
  UnexpectedEof,
  BadResource,
  CommandFailed,

  // url errors

  EmptyHost,
  IdnaError,
  InvalidPort,
  InvalidIpv4Address,
  InvalidIpv6Address,
  InvalidDomainCharacter,
  RelativeUrlWithoutBase,
  RelativeUrlWithCannotBeABaseBase,
  SetHostOnCannotBeABaseUrl,
  Overflow,

  // hyper errors

  HttpUser,
  HttpClosed,
  HttpCanceled,
  HttpParse,
  HttpOther,
  TooLarge,

  // custom errors
  InvalidUri,
  InvalidSeekMode,
  OpNotAvailable,
  WorkerInitFailed,
  UnixError,
  NoAsyncSupport,
  NoSyncSupport,
  ImportMapError,
  InvalidPath,
  ImportPrefixMissing,
  UnsupportedFetchScheme,
  TooManyRedirects,

  // other kinds
  Diagnostic,
  JSError,
}

table Cwd {}

table CwdRes {
  cwd: string;
}

enum MediaType: byte {
  JavaScript = 0,
  TypeScript,
  Json,
  Unknown
}

table Base {
  cmd_id: uint32;
  sync: bool = false;
  error_kind: ErrorKind = NoError;
  error: string;
  inner: Any;
}

table FormatError {
  error: string;
}

table FormatErrorRes {
  error: string;
}

table KeyValue {
  key: string;
  value: string;
}

table Read {
  rid: uint32;
  // (ptr, len) is passed as second parameter to Deno.core.send().
}

table ReadRes {
  nread: uint;
  eof: bool;
}

table Write {
  rid: uint32;
}

table WriteRes {
  nbyte: uint;
}

table Seek {
  rid: uint32;
  offset: int;
  whence: uint;
}

root_type Base;