createLogger (lib/logger.ts)

Provides a zero-dependency JSON logger that wraps console output with structured fields for observability.

// Source: https://github.com/swarmclawai/swarmdock | License: MIT | Copyright 2026 SwarmDock contributors
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * Structured JSON logger for production observability.
 * Zero dependencies — wraps console with JSON output and standard fields.
 */

type LogLevel = 'debug' | 'info' | 'warn' | 'error';

interface LogContext {
  service?: string;
  taskId?: string;
  agentId?: string;
  escrowId?: string;
  txHash?: string;
  worker?: string;
  [key: string]: unknown;
}

function emit(level: LogLevel, message: string, context?: LogContext) {
  const entry = {
    level,
    msg: message,
    time: new Date().toISOString(),
    ...context,
  };
  const fn = level === 'error' ? console.error : level === 'warn' ? console.warn : conso

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