union Any {
  Chdir,
  Chmod,
  Chown,
  CopyFile,
  Cwd,
  CwdRes,
  Link,
  MakeTempDir,
  MakeTempDirRes,
  Mkdir,
  Read,
  ReadDir,
  ReadDirRes,
  ReadRes,
  Readlink,
  ReadlinkRes,
  Remove,
  Rename,
  Seek,
  Stat,
  StatRes,
  Symlink,
  Truncate,
  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 Chdir {
  directory: string;
}

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

table MakeTempDir {
  dir: string;
  prefix: string;
  suffix: string;
}

table MakeTempDirRes {
  path: string;
}

table Mkdir {
  path: string;
  recursive: bool;
  mode: uint; // Specified by https://godoc.org/os#FileMode
}

table Chmod {
  path: string;
  mode: uint; // Specified by https://godoc.org/os#FileMode
}

table Chown {
  path: string;
  uid: uint;
  gid: uint;  // Specified by https://godoc.org/os#Chown
}

table Remove {
  path: string;
  recursive: bool;
}

table ReadDir {
  path: string;
}

table ReadDirRes {
  entries: [StatRes];
}

table CopyFile {
  from: string;
  to: string;
}

table Rename {
  oldpath: string;
  newpath: string;
}

table Readlink {
  name: string;
}

table ReadlinkRes {
  path: string;
}

table Symlink {
  oldname: string;
  newname: string;
}

table Link {
  oldname: string;
  newname: string;
}

table Stat {
  filename: string;
  lstat: bool;
}

table StatRes {
  is_file: bool;
  is_symlink: bool;
  len: ulong;
  modified:ulong;
  accessed:ulong;
  created:ulong;
  mode: uint;
  has_mode: bool; // false on windows
  name: string;
}

table Truncate {
  name: string;
  len: uint;
}

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;