/**
* Simple Logger - No dependencies
*/
export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
const LEVELS: Record<LogLevel, number> = {
debug: 0,
info: 1,
warn: 2,
error: 3,
};
export interface Logger {
debug(msg: string, data?: Record<string, unknown>): void;
info(msg: string, data?: Record<string, unknown>): void;
warn(msg: string, data?: Record<string, unknown>): void;
error(msg: string, data?: Record<string, unknown>): void;
child(context: Record<string, unknown>): Logger;
}
export function createLogger(options: { level?: LogLevel; context?: Record<string, unknown> } = {}): Logger {
const threshold = LEVELS[options.level ?? 'info'];
const context = options.context ?? {};
const log = (level: LogLevel, msg: string, data?: Record<string, unknown>) => {
if (LEVELS[level] < threshold) return;
const entry = {
time: new Date().toISOString(),
level,
msg,
...context,
...data,
};
const output = JSON.stringify(entry);
if (level === 'error') {
console.error(output);
} else {
console.log(output);
}
};
return {
debug: (msg, data) => log('debug', msg, data),
info: (msg, data) => log('info', msg, data),
warn: (msg, data) => log('warn', msg, data),
error: (msg, data) => log('error', msg, data),
child: (child_context) =>
createLogger({
level: options.level,
context: { ...context, ...child_context },
}),
};
}
