apply(compiler) {
    this.config.servicePath = compiler.context;
    compiler.plugin('emit', (compilation, cb) => {
      this.service.load()
        .then((slsFileObjects) => {
          const parsedSlsYml = this.variables.populateService(slsFileObjects);
          const serviceConfig = _.get(parsedSlsYml, 'custom.serviceConfig');
          const props = { 'process.env.SERVICE_CONFIG': serviceConfig ? JSON.stringify(serviceConfig) : undefined };
          compiler.apply(new webpack.DefinePlugin(props));
          cb();
        });
    });
  }