serverless/lib/plugins/aws/lib/validate.js

'use strict';

const BbPromise = require('bluebird');

module.exports = {
  validate() {
    return new BbPromise((resolve, reject) => {
      if (!this.serverless.config.servicePath) {
        const error = new this.serverless.classes.Error(
          'This command can only be run inside a service directory'
        );
        reject(error);
      }

      this.options.stage = this.provider.getStage();
      this.options.region = this.provider.getRegion();

      return resolve();
    });
  },
};