logger.js

import log4js from 'log4js';

var loggerConfiguration = {
    appenders: {
        console: { 
            type: 'console',
            layout: {
                type: 'pattern',
                pattern: '[%r] (%35.35c) - [%[%5.5p%]] - %m%'
            }
        },
        file: {
            type: 'file',
            layout: {
                type: 'pattern',
                pattern: '[%d] (%35.35c) - [%5.5p] - %m%'
            },
            filename: process.env.LOGGER_FILE
        },
    },
    categories: {
        default: { 
            appenders: ['console', 'file'], 
            filename: process.env.LOGGER_FILE
        }
    }
};

log4js.configure(loggerConfiguration);

export default log4js;

server.ts

import log4js from './core/common/logger';
const logger = log4js.getLogger('server');

import { ApolloServer } from 'apollo-server';

import resolvers from './resolvers';
import typeDefs from './schema';

const server = new ApolloServer({ resolvers, typeDefs });

server
    .listen()
    .then(({ url }) => logger.info(`Server ready at ${url}`));

if ((module as any).hot) {
    (module as any).hot.accept();
    (module as any).hot.dispose(() => server.stop());
}