/**
* Simple logging utility for the Follow Plan MCP server
*/
export type LogLevel = "debug" | "info" | "warn" | "error";
class Logger {
private level: LogLevel = "info";
setLevel(level: LogLevel): void {
this.level = level;
}
private shouldLog(level: LogLevel): boolean {
const levels = { debug: 0, info: 1, warn: 2, error: 3 };
return levels[level] >= levels[this.level];
}
private formatMessage(
level: LogLevel,
message: string,
meta?: unknown
): string {
const timestamp = new Date().toISOString();
const prefix = `[${timestamp}] [${level.toUpperCase()}]`;
if (meta) {
return `${prefix} ${message} ${JSON.stringify(meta, null, 2)}`;
}
return `${prefix} ${message}`;
}
debug(message: string, meta?: unknown): void {
if (this.shouldLog("debug")) {
console.log(this.formatMessage("debug", message, meta));
}
}
info(message: string, meta?: unknown): void {
if (this.shouldLog("info")) {
console.log(this.formatMessage("info", message, meta));
}
}
warn(message: string, meta?: unknown): void {
if (this.shouldLog("warn")) {
console.warn(this.formatMessage("warn", message, meta));
}
}
error(message: string, error?: unknown): void {
if (this.shouldLog("error")) {
const errorMessage =
error instanceof Error ? error.message : String(error);
const stack = error instanceof Error ? error.stack : undefined;
console.error(
this.formatMessage("error", message, { error: errorMessage, stack })
);
}
}
}
export const logger = new Logger();
