video_socket-server/client/public/shared/logger.js

const LOG_LEVELS = {
    debug: 10,
    info: 20,
    warn: 30,
    error: 40,
    silent: 50
};

const STORAGE_KEY = 'video_socket_log_level';
const DEFAULT_LEVEL = 'warn';

function normalizeLevel(level) {
    if (!level) {
        return DEFAULT_LEVEL;
    }

    const normalized = String(level).toLowerCase();
    return Object.prototype.hasOwnProperty.call(LOG_LEVELS, normalized)
        ? normalized
        : DEFAULT_LEVEL;
}

function getConfiguredLevel() {
    try {
        const queryLevel = new URLSearchParams(window.location.search).get('logLevel');
        if (queryLevel) {
            return normalizeLevel(queryLevel);
        }
    } catch (_error) {
    }

    try {
        const storageLevel = localStorage.getItem(STORAGE_KEY);
        if (storageLevel) {
            return normalizeLevel(storageLevel);
        }
    } catch (_error) {
    }

    return DEFAULT_LEVEL;
}

function shouldLog(level) {
    return LOG_LEVELS[level] >= LOG_LEVELS[getConfiguredLevel()];
}

function getConsoleMethod(level) {
    switch (level) {
        case 'debug':
            return console.debug;
        case 'info':
            return console.info;
        case 'warn':
            return console.warn;
        case 'error':
            return console.error;
        default:
            return console.log;
    }
}

function emit(level, scope, args) {
    if (!shouldLog(level)) {
        return;
    }

    const prefix = scope ? `[${scope}]` : '[app]';
    getConsoleMethod(level)(prefix, ...args);
}

export function createLogger(scope) {
    return {
        debug: (...args) => emit('debug', scope, args),
        info: (...args) => emit('info', scope, args),
        warn: (...args) => emit('warn', scope, args),
        error: (...args) => emit('error', scope, args)
    };
}

export function setBrowserLogLevel(level) {
    const normalized = normalizeLevel(level);
    localStorage.setItem(STORAGE_KEY, normalized);
    return normalized;
}