prepareStepOfflineInvoke() {
    _.set(this.serverless, 'service.package.individually', false);

    return this.serverless.pluginManager.spawn('webpack:validate').then(() => {
      if (!this.options.location && !_.get(this.serverless, 'service.custom.stepFunctionsOffline.location')) {
        _.set(
          this.serverless,
          'service.custom.stepFunctionsOffline.location',
          path.relative(this.serverless.config.servicePath, path.join(this.webpackOutputPath, 'service'))
        );
      }
      return null;
    });
  }
Special settings for use with serverless-step-functions-offline.