Variable loggerConst

The shared logger instance, tagged jabr.

Use the severity-specific methods rather than console:

• logger.start(...) — an operation is beginning (e.g. "pushing 'feature-a'")
• logger.info(...) — neutral information
• logger.success(...) — an operation completed
• logger.warn(...) — a non-fatal concern
• logger.error(...) — a failure (see also fail)