import type { LogLevel, LogEntry } from '../types/index.js';
const LOG_LEVELS: Record<LogLevel, number> = {
debug: 0,
info: 1,
warn: 2,
error: 3,
};
function getCurrentLogLevel(): LogLevel {
const envLevel = process.env.LOG_LEVEL?.toLowerCase() as LogLevel | undefined;
if (envLevel && LOG_LEVELS[envLevel] !== undefined) {
return envLevel;
}
return 'info';
}
function formatLogEntry(entry: LogEntry): string {
const { level, message, timestamp, data } = entry;
const prefix = `[${timestamp}] [${level.toUpperCase()}]`;
if (data && Object.keys(data).length > 0) {
return `${prefix} ${message} ${JSON.stringify(data)}`;
}
return `${prefix} ${message}`;
}
function writeLog(level: LogLevel, message: string, data?: Record<string, unknown>): void {
const currentLevel = getCurrentLogLevel();
if (LOG_LEVELS[level] < LOG_LEVELS[currentLevel]) {
return;
}
const entry: LogEntry = {
level,
message,
timestamp: new Date().toISOString(),
data,
};
console.error(formatLogEntry(entry));
}
export const logger = {
debug(message: string, data?: Record<string, unknown>): void {
writeLog('debug', message, data);
},
info(message: string, data?: Record<string, unknown>): void {
writeLog('info', message, data);
},
warn(message: string, data?: Record<string, unknown>): void {
writeLog('warn', message, data);
},
error(message: string, data?: Record<string, unknown>): void {
writeLog('error', message, data);
},
};
export function createLogger(prefix: string) {
return {
debug(message: string, data?: Record<string, unknown>): void {
logger.debug(`[${prefix}] ${message}`, data);
},
info(message: string, data?: Record<string, unknown>): void {
logger.info(`[${prefix}] ${message}`, data);
},
warn(message: string, data?: Record<string, unknown>): void {
logger.warn(`[${prefix}] ${message}`, data);
},
error(message: string, data?: Record<string, unknown>): void {
logger.error(`[${prefix}] ${message}`, data);
},
};
}
