Torben Sorensen
1d0bd630b2
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50 lines
2.1 KiB
TypeScript
50 lines
2.1 KiB
TypeScript
// src/services/logger.ts
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/**
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* A simple logger service that wraps the console.
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* This provides a centralized place to manage logging behavior,
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* such as adding timestamps, log levels, or sending logs to a remote service.
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*/
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const getTimestamp = () => new Date().toISOString();
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type LogLevel = 'INFO' | 'WARN' | 'ERROR' | 'DEBUG';
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/**
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* The core logging function. It uses a generic rest parameter `<T extends any[]>`
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* to safely accept any number of arguments of any type, just like the native console
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* methods. Using `unknown[]` is more type-safe than `any[]` and satisfies the linter.
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*/
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const log = <T extends unknown[]>(level: LogLevel, message: string, ...args: T) => {
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// Check if `process` is available (Node.js) vs. browser environment.
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// This makes the logger "isomorphic" and prevents runtime errors on the client.
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const envIdentifier = typeof process !== 'undefined' && process.pid
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? `PID:${process.pid}`
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: 'BROWSER';
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const timestamp = getTimestamp();
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// We construct the log message with a timestamp, PID, and level for better context.
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const logMessage = `[${timestamp}] [${envIdentifier}] [${level}] ${message}`;
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switch (level) {
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case 'INFO':
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console.log(logMessage, ...args);
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break;
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case 'WARN':
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console.warn(logMessage, ...args);
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break;
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case 'ERROR':
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console.error(logMessage, ...args);
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break;
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case 'DEBUG':
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// For now, we can show debug logs in development. This could be controlled by an environment variable.
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console.debug(logMessage, ...args);
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break;
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}
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};
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// Export the logger object for use throughout the application.
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export const logger = {
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info: <T extends unknown[]>(message: string, ...args: T) => log('INFO', message, ...args),
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warn: <T extends unknown[]>(message: string, ...args: T) => log('WARN', message, ...args),
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error: <T extends unknown[]>(message: string, ...args: T) => log('ERROR', message, ...args),
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debug: <T extends unknown[]>(message: string, ...args: T) => log('DEBUG', message, ...args),
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}; |