gepa-spo/dist/logger.js

Genetic-Pareto prompt optimizer to evolve system prompts from a few rollouts with modular support and intelligent crossover

/**
 * Simple colored logger with high-level step logging.
 * No external deps; ANSI colors via constants only.
 */
/** ANSI color constants (do not hardcode colors elsewhere). */
export const COLORS = {
    reset: '\u001b[0m',
    dim: '\u001b[2m',
    bold: '\u001b[1m',
    gray: '\u001b[90m',
    red: '\u001b[31m',
    green: '\u001b[32m',
    yellow: '\u001b[33m',
    blue: '\u001b[34m',
    magenta: '\u001b[35m',
    cyan: '\u001b[36m',
    white: '\u001b[37m'
};
function shouldLog(level, desired) {
    const order = {
        error: 0,
        warn: 1,
        info: 2,
        debug: 3
    };
    if (desired === 'silent')
        return false;
    if (level === 'silent')
        return false;
    return order[level] <= order[desired];
}
export function createLogger(enabled, level = 'info') {
    const fmt = (color, label, msg) => {
        return `${COLORS.dim}${new Date().toISOString()}${COLORS.reset} ${color}${label}${COLORS.reset} ${msg}`;
    };
    const logImpl = (target, color, label, msg) => {
        if (!enabled)
            return;
        // eslint-disable-next-line no-console
        console[target](fmt(color, label, msg));
    };
    return {
        enabled,
        level,
        info(message) {
            if (shouldLog('info', level))
                logImpl('log', COLORS.cyan, '[info]', message);
        },
        warn(message) {
            if (shouldLog('warn', level))
                logImpl('warn', COLORS.yellow, '[warn]', message);
        },
        error(message) {
            if (shouldLog('error', level))
                logImpl('error', COLORS.red, '[error]', message);
        },
        debug(message) {
            if (shouldLog('debug', level))
                logImpl('log', COLORS.gray, '[debug]', message);
        },
        step(title, detail) {
            if (!enabled)
                return;
            const t = `${COLORS.magenta}${COLORS.bold}${title}${COLORS.reset}`;
            const d = detail ? `${COLORS.gray}${detail}${COLORS.reset}` : '';
            // eslint-disable-next-line no-console
            console.log(`${t} ${d}`.trim());
        }
    };
}
/** A no-op logger you can use as default. */
export const silentLogger = createLogger(false, 'silent');