type LogLevel = 'debug' | 'info' | 'warn' | 'error';
const LOG_LEVELS: Record<LogLevel, number> = {
debug: 0,
info: 1,
warn: 2,
error: 3,
};
class Logger {
private minLevel: LogLevel;
private prefix: string;
constructor(prefix: string = 'figmad', minLevel: LogLevel = 'info') {
this.prefix = prefix;
this.minLevel = minLevel;
}
private shouldLog(level: LogLevel): boolean {
return LOG_LEVELS[level] >= LOG_LEVELS[this.minLevel];
}
private formatMessage(level: LogLevel, message: string, data?: unknown): string {
const timestamp = new Date().toISOString();
const dataStr = data ? ` ${JSON.stringify(data)}` : '';
return `[${timestamp}] [${this.prefix}] [${level.toUpperCase()}] ${message}${dataStr}`;
}
debug(message: string, data?: unknown): void {
if (this.shouldLog('debug')) {
console.error(this.formatMessage('debug', message, data));
}
}
info(message: string, data?: unknown): void {
if (this.shouldLog('info')) {
console.error(this.formatMessage('info', message, data));
}
}
warn(message: string, data?: unknown): void {
if (this.shouldLog('warn')) {
console.error(this.formatMessage('warn', message, data));
}
}
error(message: string, error?: unknown): void {
if (this.shouldLog('error')) {
const errorData = error instanceof Error
? { message: error.message, stack: error.stack }
: error;
console.error(this.formatMessage('error', message, errorData));
}
}
child(prefix: string): Logger {
return new Logger(`${this.prefix}:${prefix}`, this.minLevel);
}
setLevel(level: LogLevel): void {
this.minLevel = level;
}
}
export const logger = new Logger('figmad', process.env.DEBUG === 'true' ? 'debug' : 'info');
export function createLogger(prefix: string): Logger {
return logger.child(prefix);
}
