code: function requireValidate(path, optional = false) {
    let driver;
  
    try {
      driver = require(path);
    } catch (er) {
      if (optional) {
        console.log('optional driver ' + path + ' not available');
        return;
      } else {
        // rethrow
        throw er;
      }
    }
  
    if (!driver.id) {
      console.error(`${path} must export a unique id`);
      process.exit(1);
    }
  
    if (!driver.name) {
      console.error(`${path} must export a name`);
      process.exit(1);
    }
  
    if (drivers[driver.id]) {
      console.error(`Driver with id ${driver.id} already loaded`);
      console.error(`Ensure ${path} has a unique id exported`);
      process.exit(1);
    }
  
    validateFunction(path, driver, 'getSchema');
    validateFunction(path, driver, 'runQuery');
    validateFunction(path, driver, 'testConnection');
    validateArray(path, driver, 'fields');
  
    driver.fieldsByKey = {};
  
    driver.fields.forEach(field => {
      driver.fieldsByKey[field.key] = field;
    });
  
    drivers[driver.id] = driver;
  }
docs: Require driver implementation for provided path
  and validate that it meets implementation spec as possible
  @param {string} path