How to fix Protractor, log4js configuration error?

I am trying to run a protractor tests. But facing issue with log4js. I did npm install log4js. Does the before launch configuration looks right? Is there anything I should change in the format for current version of log4js?

Below is the error:

Error: Problem with log4js configuration: ({
  appenders: {
    out: {
      type: 'log4js-protractor-appender',
      category: 'protractorLog4js'
    },
    app: {
      type: 'file',
      filename: './logs/ExecutionLog.log',
      category: 'protractorLog4js'
    }
  },
  categories: { default: { appenders: [ 'out', 'app' ], level: 'info' } }
}) - appender "out" is not valid (type "log4js-protractor-appender" could not be found)
    at C:\Project\PrjectName\node_modules\log4js\lib\configuration.js:31:13
    at Array.forEach (<anonymous>)
    at Object.throwExceptionIf (C:\Project\PrjectName\node_modules\log4js\lib\configuration.js:29:9)
    at createAppender (C:\Project\PrjectName\node_modules\log4js\lib\appenders\index.js:47:17)
    at C:\Project\PrjectName\node_modules\log4js\lib\appenders\index.js:77:25
    at Array.forEach (<anonymous>)
    at setup (C:\Project\PrjectName\node_modules\log4js\lib\appenders\index.js:75:33)
    at C:\Project\PrjectName\node_modules\log4js\lib\configuration.js:46:33
    at Array.forEach (<anonymous>)
    at Object.configure (C:\Project\PrjectName\node_modules\log4js\lib\configuration.js:46:13)
npm ERR! Test failed.  See above for more details.

This is my before launch configuration in config file

beforeLaunch:function(){
          log4js.configure({
            appenders: {
              out:{ type: 'log4js-protractor-appender'},
              app:{ type: "file",
                    filename: './logs/ExecutionLog.log'}
              },
            categories: {
                    default: { appenders: [ 'out', 'app' ], level: 'info' }
            }
            });
        },

Thanks

Solution

the type of appenders that log4js supports are:

export type Appender = CategoryFilterAppender
    | ConsoleAppender
    | FileAppender
    | SyncfileAppender
    | DateFileAppender
  | LogLevelFilterAppender
  | NoLogFilterAppender
    | MultiFileAppender
    | MultiprocessAppender
    | RecordingAppender
    | StandardErrorAppender
    | StandardOutputAppender
    | CustomAppender;

If you remove the "appender" from the name you will get the supported type ex: console, file, multifile... etc

Here is an exmple configuration.

const log4js_config: Configuration = {
        appenders: {
            consoleErrors: {
                type: 'logLevelFilter',
                appender: 'console',
                level: 'error'
            },
            console: {
                type: 'console'
            },
        },
        categories: {
            default: { appenders: [ 'console', 'consoleErrors' ], level: 'debug' }
        }
    };

const Log4js = require('log4js');
log4js.configure(LOG4JS_CONFIGURATION);

Like this you have two types of appenders in the default category.

console appender will log everything in the console no matter the level.
consoleErrors overrides other rules for console and filter only error level messages or higher to console.

You can read more about log4js configuration in: https://github.com/log4js-node/log4js-node

Examples how the appenders work and how to configure them: https://github.com/log4js-node/log4js-node/tree/master/examples