no-danger-with-children crashes with undefined second argument.

[amanda-mitchell]

This code works just fine with eslint:

React.createElement('div', null, 'content');

while this code (which Typescript encourages)

React.createElement('div', undefined, 'content')

Results in a crash with this stacktrace

Cannot read property 'node' of undefined
TypeError: Cannot read property 'node' of undefined
    at EventEmitter.CallExpression (/Users/dmitchell/Code/eslint-plugin-react-bug/node_modules/eslint-plugin-react/lib/rules/no-danger-with-children.js:100:45)
    at emitOne (events.js:96:13)
    at EventEmitter.emit (events.js:188:7)
    at NodeEventGenerator.applySelector (/Users/dmitchell/Code/eslint-plugin-react-bug/node_modules/eslint/lib/util/node-event-generator.js:265:26)
    at NodeEventGenerator.applySelectors (/Users/dmitchell/Code/eslint-plugin-react-bug/node_modules/eslint/lib/util/node-event-generator.js:294:22)
    at NodeEventGenerator.enterNode (/Users/dmitchell/Code/eslint-plugin-react-bug/node_modules/eslint/lib/util/node-event-generator.js:308:14)
    at CodePathAnalyzer.enterNode (/Users/dmitchell/Code/eslint-plugin-react-bug/node_modules/eslint/lib/code-path-analysis/code-path-analyzer.js:602:23)
    at CommentEventGenerator.enterNode (/Users/dmitchell/Code/eslint-plugin-react-bug/node_modules/eslint/lib/util/comment-event-generator.js:98:23)
    at Traverser.enter (/Users/dmitchell/Code/eslint-plugin-react-bug/node_modules/eslint/lib/eslint.js:929:36)
    at Traverser.__execute (/Users/dmitchell/Code/eslint-plugin-react-bug/node_modules/estraverse/estraverse.js:397:31)

I've created a minimal repository that illustrates this issue at https://github.com/david-mitchell/eslint-plugin-react-bug

[ljharb]

Thanks! In JS, it's idiomatic to use null over undefined, but both should work.