NullLogger

Dummy implementation of logger with no real effect.

Implements: ILogger

Description

The NullLogger class provides a dummy logger with no real effect.

Important points

  • It can be used in testing or in situations when a logger is required but must be disabled.

Instance methods

debug

Logs high-level debug information for troubleshooting.

public debug(context: IContext, message: string, …args: any[])

  • context: IContext - (optional) a context to trace execution through call chain.
  • message: string - a human-readable message to log.
  • args: any[] - arguments to parameterize the message.

error

Logs recoverable application error.

public error(context: IContext, error: Error, message: string, …args: any[])

  • context: IContext - (optional) a context to trace execution through call chain.
  • error: Error - an error object associated with this message.
  • message: string - a human-readable message to log.
  • args: any[] - arguments to parameterize the message.

fatal

Logs fatal (unrecoverable) message that caused the process to crash.

public fatal(context: IContext, error: Error, message: string, …args: any[])

  • context: IContext - (optional) a context to trace execution through call chain.
  • error: Error - an error object associated with this message.
  • message: string - a human-readable message to log.
  • args: any[] - arguments to parameterize the message.

getLevel

Gets the maximum log level. Messages with higher log level are filtered out.

public getLevel(): LogLevel

  • returns: LogLevel - the maximum log level.

info

Logs an important information message

public info(context: IContext, message: string, …args: any[])

  • context: IContext - (optional) a context to trace execution through call chain.
  • message: string - a human-readable message to log.
  • args: any[] - arguments to parameterize the message.

log

Logs a message at specified log level.

public log(level: LogLevel, context: IContext, error: Error, message: string, …args: any[])

  • level: LogLevel - a log level.
  • context: IContext - (optional) a context to trace execution through call chain.
  • error: Error - an error object associated with this message.
  • message: string - a human-readable message to log.
  • args: any[] - arguments to parameterize the message.

trace

Logs low-level debug information for troubleshooting.

public trace(context: IContext, message: string, …args: any[])

  • context: IContext - (optional) a context to trace execution through call chain.
  • message: string - a human-readable message to log.
  • args: any[] - arguments to parameterize the message.

warn

Logs a warning that may or may not have a negative impact.

public warn(context: IContext, message: Error, …args: any[])

  • context: IContext - (optional) a context to trace execution through call chain.
  • message: string - a human-readable message to log.
  • args: any[] - arguments to parameterize the message.

See also