LogMessage = object
  case kind*: MessageKind
  of mkWrite:
      sContext*, sText*: string
      iSeverity*: int
      trace*: TraceInfo

  of mkUpdate:
      nil

  of mkAddTarget, mkRemoveTarget:
      sName*: string
      target*: LogTarget

  of mkStop:
      nil

  

proc logThread() {...}{.thread, raises: [ValueError, Exception, IOError, KeyError],
                   tags: [RootEffect, WriteIOEffect, TimeEffect].}

proc start_logging() {...}{.raises: [ResourceExhaustedError, ValueError, Exception,
                                IOError, KeyError],
                       tags: [RootEffect, WriteIOEffect, TimeEffect].}

proc stop_logging() {...}{.noconv, raises: [Exception], tags: [RootEffect].}

proc add_target(name: string; newTarget: LogTarget) {...}{.raises: [Exception],
    tags: [RootEffect].}

template debug(sNewMessage: string; sNewContext = ""): untyped

template info(sNewMessage: string; sNewContext = ""): untyped

template warning(sNewMessage: string; sNewContext = ""): untyped

template error(sNewMessage: string; sNewContext = ""): untyped

template critical(sNewMessage: string; sNewContext = ""): untyped