@200systems/mf-logger/dist/formatter.js

Structured logging with multiple outputs and performance timing for TypeScript applications

export class LogFormatter {
    colors = {
        debug: '\x1b[36m', // cyan
        info: '\x1b[32m', // green
        warn: '\x1b[33m', // yellow
        error: '\x1b[31m', // red
        reset: '\x1b[0m',
        bold: '\x1b[1m',
        dim: '\x1b[2m',
    };
    formatJson(entry) {
        return JSON.stringify(entry);
    }
    formatPretty(entry) {
        const timestamp = this.formatTimestamp(entry.timestamp);
        const level = this.formatLevel(entry.level);
        const context = entry.context ? `[${entry.context}]` : '';
        const message = entry.message;
        let output = `${timestamp} ${level} ${context} ${message}`.trim();
        if (entry.metadata && Object.keys(entry.metadata).length > 0) {
            output += `\n${this.colors.dim}${JSON.stringify(entry.metadata, null, 2)}${this.colors.reset}`;
        }
        if (entry.error?.stack) {
            output += `\n${this.colors.dim}${entry.error.stack}${this.colors.reset}`;
        }
        if (entry.request) {
            const req = entry.request;
            const reqInfo = `${req.method} ${req.url} ${req.ip || ''} ${req.userAgent || ''}`.trim();
            output += `\n${this.colors.dim}Request: ${reqInfo}${this.colors.reset}`;
        }
        if (entry.performance?.duration) {
            output += `\n${this.colors.dim}Duration: ${entry.performance.duration}ms${this.colors.reset}`;
        }
        return output;
    }
    formatTimestamp(timestamp) {
        return `${this.colors.dim}${timestamp}${this.colors.reset}`;
    }
    formatLevel(level) {
        const color = this.colors[level];
        const levelStr = level.toUpperCase().padEnd(5);
        return `${color}${this.colors.bold}${levelStr}${this.colors.reset}`;
    }
}
export const defaultFormatter = new LogFormatter();
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