问题 es6（弱）映射集的右反应组件PropTypes

这不方便，但可以编写自己的PropType。

来自React的源代码（不幸的是，此时不会公开）：

function createChainableTypeChecker(validate) {
  function checkType(isRequired, props, propName, componentName, location, propFullName) {
    componentName = componentName || ANONYMOUS;
    propFullName = propFullName || propName;
    if (props[propName] == null) {
      var locationName = ReactPropTypeLocationNames[location];
      if (isRequired) {
        return new Error('Required ' + locationName + ' `' + propFullName + '` was not specified in ' + ('`' + componentName + '`.'));
      }
      return null;
    } else {
      return validate(props, propName, componentName, location, propFullName);
    }
  }

  var chainedCheckType = checkType.bind(null, false);
  chainedCheckType.isRequired = checkType.bind(null, true);

  return chainedCheckType;
}

您可以这样使用：

const map = createChainableTypeChecker(function(props, propName, componentName, location, propFullName) {
    if (...) {
        return null; // pass the check
    }
    return new Error('Error message'); // fail the check
});

尝试使用自定义属性验证器功能（来自 文件）：

// You can also specify a custom validator. It should return an Error
// object if the validation fails. Don't `console.warn` or throw, as this
// won't work inside `oneOfType`.
customProp: function(props, propName, componentName) {
  if (!/matchme/.test(props[propName])) {
    return new Error('Validation failed!');
  }
}

所以这可能看起来像：

static propTypes = {
    elementMap: (props, propName) => {
        const m = props[propName];
        if (!m) { return new Error(`Required property ${propName} not supplied`); }
        if (!(m instanceof Map)) { return new Error("must be a Map"); }
        // check contents of map if you want...
    },
};