"sort-prop-types" rule fails when using spread operator and ignoreCase is enabled

[dimkaufo]

If we define rule this way:

"rules": {
    "react/sort-prop-types": [2, {"ignoreCase": true}]
}

and if we have class with the following piece of code:

import {Component} from 'react';

const spread = {
    a: PropTypes.string,
    b: PropTypes.object,
}

export default class ClassWithSpreadInPropTypes extends Component {
   static propTypes = {
       ...spread,
       c: PropTypes.string
   }
}

then we have the following error: TypeError: Cannot read property 'toLowerCase' of undefined

eslint-plugin-react version 4.1.0

[yannickcr]

I was not able to reproduce the crash.

What versions of eslint and babel-eslint are you using?

[dimkaufo]

Sorry, it seems that spread operator is not the only reason of this crash (my previous example is not valid). That is valid:

a.js

import {Component, PropTypes} from 'react';

export default class BaseClass extends Component {
   static propTypes = {
       a: PropTypes.string,
       b: PropTypes.object
   }
}

b.js

import {PropTypes} from 'react';
import BaseClass from 'a';

export default class ClassWithSpreadInPropTypes extends BaseClass {
   static propTypes = {
       ...BaseClass.propTypes,
       c: PropTypes.string
   }
}

versions:

"babel-eslint": "5.0.0",
"eslint": "1.10.3",
"eslint-plugin-react": "4.1.0"