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This change makes Bun's warning output much less scary by matching Node.js behavior. Changes: - Add --trace-warnings CLI flag support - Format warnings as: (bun:PID) WarningName: message - Show stack traces only when --trace-warnings is passed - Show helpful hint about --trace-warnings flag (only once per process) - Warnings go to stderr (not console.warn which showed full error objects) Before: process.emitWarning() would dump full error object with stack trace, making every warning look like a critical error After: - Without --trace-warnings: Shows minimal format with helpful hint - With --trace-warnings: Shows stack trace like Node.js 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>