CustomError write error and stack direct to database stack format like at firstLine (a.js:3) at secondLine (b.js:3) CustomError(ctx, "hi error", stack) .

Debug only print message when os.Getenv("DEBUG") is define Debug(ctx,"server start") .

Error log error to google cloud and return error id, return empty if error not logged stack format like at firstLine (a.js:3) at secondLine (b.js:3) Error(ctx, err) .

Error log error to google cloud and return error id, return empty if error not logged stack format like at firstLine (a.js:3) at secondLine (b.js:3) Error(ctx, err) .

ForceStopLog set to true will stop log .

History get log history in string History() .

Info as Normal but significant events, such as start up, shut down, or a configuration change.

KeepHistory keep all printed log into history KeepHistory(true) .

PrettyPrint pretty-prints its operands and writes to standard output.

PrettyValue return pretty print string .

ResetHistory reset history ResetHistory() .

Warn as Warning events might cause problems.