@boost/log/src/createLogger.ts

Lightweight level based logging system.

import { isObject } from '@boost/common';
import { LOG_LEVELS } from './constants';
import { Logger } from './Logger';
import type { LoggerFunction, LoggerOptions, LogLevel } from './types';

function pipeLog(logger: Logger, level?: LogLevel) {
	return (...args: unknown[]) => {
		let metadata = {};
		let message = '';

		if (isObject(args[0])) {
			metadata = (args as object[]).shift()!;
		}

		message = (args as string[]).shift()!;

		logger.log({
			args,
			level,
			message,
			metadata,
		});
	};
}

/**
 * Create and return a logger with any configured transports.
 */
export function createLogger(options: LoggerOptions): LoggerFunction {
	const logger = new Logger(options);
	const log = pipeLog(logger);

	LOG_LEVELS.forEach((level) => {
		Object.defineProperty(log, level, {
			value: pipeLog(logger, level),
		});
	});

	Object.defineProperty(log, 'disable', {
		value: () => {
			logger.disable();
		},
	});

	Object.defineProperty(log, 'enable', {
		value: () => {
			logger.enable();
		},
	});

	return log as LoggerFunction;
}