/**
 * Custom PropTypes validator for Immutable JS data
 *
 * This helper performs the following operations
 * 1. Check that prop is immutable
 * 2. Convert value toJS() then check it against the prop type specs.
 */
import PropTypes from 'prop-types';
import { isImmutable } from 'immutable';

const ImmutableType = (typeSpecs) => (props, propName, componentName) => { // eslint-disable-line consistent-return
  const propValue = props[propName];
  if (!isImmutable(propValue)) {
    return new Error(`Prop ${propName} supplied to ${componentName} is not immutable.`);
  }
  const value = propValue.toJS();
  return PropTypes.checkPropTypes({ [propName]: typeSpecs }, { [propName]: value }, propName, componentName);
};

export default ImmutableType;