export function withConditionalRequire(fn, msg = null) {
  fn.isRequiredIf = function (cb) {
    if (typeOf(cb) !== 'Function') {
      return new Error(`\`withConditionalRequire\` expect first argument
       to be a valid callback. ${typeOf(cb)} given.
       `);
    }

    return function (props, propName, componentName) {
      if (cb(props, propName, componentName)) {
        const prop = props[propName];

        if (typeof prop === 'undefined') {
          let errorMsg;

          switch (typeOf(msg)) {
            case 'Function':
              errorMsg = msg(props, propName, componentName);
              break;
            case 'String':
              errorMsg = msg;
              break;
          }

          return typeOf(errorMsg) === 'String'
            ? new Error(errorMsg)
            : new Error(`The prop ${propName} is marked as required in 
             ${componentName}, but its value is undefined.`);
        }
      }
      return checkPropTypes({ [propName]: fn }, props, propName, componentName);
    };
  };
  return fn;
}