@flare-city/logger

Overview

The @flare-city/logger is a TypeScript class designed for logging in a Node.js / Cloudflare Workers / JS Edge Runtime environment. It provides flexible and customizable logging functionalities with support for different log levels and output formats. This documentation will guide you through understanding how the code works, how to use it, and provide examples.

Installation

To use the Logger class in your project, you can include the provided TypeScript file. If you are using a package manager like npm or yarn, you can install it as follows:

npm install @flare-city/logger

Usage

import { Logger, LogLevel, LoggingType } from "@flare-city/logger";
 
// Create a new instance of Logger
const logger = new Logger({
  name: "MyLogger",
  level: "info",
  loggingType: "json",
});
 
// Log messages at different levels
logger.debug("This is a debug message", { additionalData: "some data" });
logger.info("This is an info message", { moreInfo: "additional info" });
logger.warn("This is a warning message", { warningDetails: "some details" });
logger.error("This is an error message", { errorDetails: "some details" });
 
// Change log level dynamically
logger.setLogLevel("debug");

Constructor Options

When creating a new instance of Logger, you can provide the following options:

• name (optional): A string representing the name of the logger. Default is "Logger".
• level (optional): The initial log level. It can be "debug", "info", "warn", or "error". Default is "info".
• loggingType (optional): The output format for logs. It can be "simple" or "json". Default is "json".

Methods

setName

setName(name: string): void

Sets the name of the logger dynamically.

setLoggingType

setLoggingType(loggingType: LoggingType): void

Sets the logging type dynamically. The logging type can be "simple" or "json".

log

log(level: LogLevel, message: string, data: Record<string, any>): void

Logs a message with the specified log level. The data parameter is an optional object for additional information.

debug

debug(message: string, data: Record<string, any>): void

Logs a debug message.

info

info(message: string, data: Record<string, any>): void

Logs an info message.

warn

warn(message: string, data: Record<string, any>): void

Logs a warning message.

error

error(message: string, data: Record<string, any>): void

Logs an error message.

setLogLevel

setLogLevel(level: LogLevel): void

Sets the log level dynamically. Valid log levels are "debug", "info", "warn", and "error". If an invalid level is provided, a warning will be logged.

Examples

Example 1: Basic Usage

const logger = new Logger();
 
logger.info("Hello, Logger!");

Example 2: Custom Name and Logging Type

const logger = new Logger({
  name: "CustomLogger",
  loggingType: "simple",
});
 
logger.debug("This is a debug message.");

Example 3: Dynamic Log Level

const logger = new Logger();
 
logger.info("This will be logged.");
 
logger.setLogLevel("debug");
 
logger.debug("This will also be logged.");