import MissingConfigurationValueError from '../errors/MissingConfigurationValueError';
import type { NonUndefined, ValueOf } from '../types';

const requireConfig = <T>(isomorphicConfig: T, key: keyof T) => {
  const valueUnderKey = isomorphicConfig[key];

  if (typeof valueUnderKey === 'undefined') {
    throw new MissingConfigurationValueError(`Value for configuration key ${key} was undefined.`);
  }

  return valueUnderKey as NonUndefined<ValueOf<T>>;
};

export default requireConfig;