Graph breaks after aot build

I’m submitting a … (check one with “x”)

[x] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ ] support request => Please do not submit support request here

Current behavior

just start app in dev mode everything is ok

but after aot build, the graph seems can not build links between nodes

core.js:1427 ERROR TypeError: Cannot read property '_in' of undefined
    at graph.js:117
    at en (lodash.js:603)
    at Function.ai.filter (lodash.js:9189)
    at a.sources (graph.js:116)
    at longestPath (util.js:52)
    at p (network-simplex.js:56)
    at a (index.js:47)
    at OTPI.t.exports (index.js:34)
    at layout.js:35
    at notime (util.js:235)
    at layout.js:35
    at notime (util.js:235)
    at layout.js:25
    at notime (util.js:235)
    at Object.C2uY.t.exports [as layout] (layout.js:22)
    at e.draw (graph.component.js:179)

All nodes are huddled together.

Expected behavior

Reproduction of the problem

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

window10 and ubuntu14.04 webpack dev server and nginx

• ngx-graph version: 4.0.2

• Angular version: 5.1.0

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

• Language: [all | TypeScript 2.6.2/2.6.1/2.5.x | ES6/7 | ES5]

[changev]

@isaacplmann thans very much! Seems that fixing this issue in ngx-graph is a little hard. So can I do something to change my aot build steps to support ngx-graph?

[changev]

@isaacplmann Please review this issue, thanks very much!