logging via Ajax endpoint

logging.es6.js

import Location from './location.es6';
import { isJQueryAvailable } from './lib.es6';

export const LOG_LEVEL_DEBUG = 'DEBUG'; // eslint-disable-line no-unused-vars
export const LOG_LEVEL_INFO = 'INFO'; // eslint-disable-line no-unused-vars
export const LOG_LEVEL_WARN = 'WARN';
export const LOG_LEVEL_ERROR = 'ERROR'; // eslint-disable-line no-unused-vars
export const LOG_LEVEL_OFF = 'OFF'; // eslint-disable-line no-unused-vars

const INTERNAL_LOGGING_URL = '/clientLogger';

export class Logger {
    /**
     * @param {string} message
     * @param {string} logger
     * @param {string} level
     * @param {string[]} history
     * @return {Promise}
     */
    static log(message, logger = 'ClientLogger', level = LOG_LEVEL_WARN, history = []) {
        let browserHistory = history;

        if (history.length === 0) {
            const currentLocation = Location.get(window);
            browserHistory = [currentLocation];
        }

        return new Promise((resolve) => {
            if (isJQueryAvailable) {
                $.ajax({
                    method: 'POST',
                    url: INTERNAL_LOGGING_URL,
                    data: JSON.stringify({
                        message, logger, level, browserHistory
                    }),
                    contentType: 'application/json'
                })
                    .always(() => {
                        resolve();
                    });
            } else {
                fetch(INTERNAL_LOGGING_URL, {
                    method: 'POST',
                    url: INTERNAL_LOGGING_URL,
                    body: JSON.stringify({
                        message, logger, level, browserHistory
                    }),
                    headers: new Headers({
                        'Content-Type': 'application/json'
                    })
                })
                    .then(() => {
                        resolve();
                    });
            }
        });
    }
}