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There is a newer version: 1.4.0

/*eslint no-console: "off"*/
/*
 * #%L
 * %%
 * Copyright (C) 2011 - 2017 BMW Car IT GmbH
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

/**
 * A log4javascript Appender that sends a logged message from a WebWorker to the main context to
 * log it there
 *
 * @name ConsoleAppender
 * @constructor
 */
function ConsoleAppender() {}

/**
 * Implementing the appender function of log4javascript appenders
 *
 * @name ConsoleAppender#append
 * @function
 */
ConsoleAppender.prototype.append = function(loggingEvent) {
    const logLevel = loggingEvent.level.name.toLowerCase();
    const formattedMessage = loggingEvent.messages.join(",");
    console[logLevel] = console[logLevel] || console.log;
    console[logLevel](formattedMessage);
};

ConsoleAppender.prototype.toString = function toString() {
    return "ConsoleAppender";
};

module.exports = ConsoleAppender;