betomorrow / logging

Logging tools for react & react-native

Logging

Mono-repo for logging related tools. This includes @betomorrow/logging-core package which provides core features and abstractions and @betomorrow/logging-native a react-native override with file logging support.

Usage

import {
	MemoryStorage,
	DefaultLoggerManagerBuilder,
	LogLevel,
	ConsoleFormatter,
	DebugScreenFormatter,
} from "@betomorrow/logging-core";

export const loggerManager = new DefaultLoggerManagerBuilder()
	.withLevel(LogLevel.DEBUG)
	.withConsoleAppender(new ConsoleFormatter())
	.withMemoryAppender(new MemoryStorage(), new DebugScreenFormatter())
	.build();

export const logger = loggerManager.getLogger();

One logger can have many appenders (outputs). One appender have one formatter describing how logs should be displayed.

Note: native package shoud be used in react-native environnement for performance considerations

Core appenders

• ConsoleAppender
• MemoryAppender

Native appenders

• FileAppender
• RollingFileAppender

logging's Issues

TypeError when logging without argument

This code:

import {
	ConsoleFormatter,
	DefaultLoggerManagerBuilder,
	LogLevel,
} from "@betomorrow";

const loggerManager = new DefaultLoggerManagerBuilder()
	.withLevel(LogLevel.DEBUG)
	.withConsoleAppender(new ConsoleFormatter())
	.build();

const logger = loggerManager.getLogger();

logger.info("foo"); // <- this throws
logger.info("foo", "bar"); // <- this not throws

throws this error:
DefaultLogger - cannot append log [TypeError: reduce of empty array with no initial value]
when args parameter is empty