react complains props is not a plain object

[nippur72]

I have the following react code running in node.js:

let fn = _eval(
`
      var React = require("react");
      module.exports = function(props,el) {
         return React.createElement("div",{},"hello");
      }
`
, "eval", {}, true);
let component = React.createElement(fn, { name: "John" });           
let s = ReactDOMServer.renderToString(component);
console.log(s);

but react complains that

Warning: React.createElement(...): Expected props argument to be a plain object. Properties defined in its prototype chain will be ignored.

Does anybody knows why this is happening and is there something I can do?

Of course there is no warning if I execute outside of _eval. I should mention also that the above warning was introduced with https://github.com/facebook/react/pull/6134

[philiptzou]

I encountered the same problem when I trying to evaluate a piece of string which contains calls to React.createElement. And I found the reason is that node-eval used vm which created an entirely new context:

const evaluate = require('eval');

const O2 = evaluate("module.exports = Object;");
console.log(O2 === Object); // output false

The solution is to prevent usage of vm or just use vm.runInThisContext. Additionally, I found another package named require-from-string doesn't have the problem since it used a different approach to load values from strings.