fix(router-plugin): handle explicit undefined component in code splitter

[wtlin1228]

Handle the edge case where options.component exists but the value is undefined.

const Route = createFileRoute('/')({
  component: undefined,
})

Before: SplitComponent is not defined -> runtime error 🚨

import React from 'react';
import { Route } from "explicit-undefined-component.tsx";
export { SplitComponent as component };

After: no SplitComponent is generated -> it works ✅

import React from 'react';
import { Route } from "explicit-undefined-component.tsx";

[schiller-manuel]

nice! can you please rebase once we merged #4565 since the snapshots will conflict?

[wtlin1228]

@schiller-manuel done!

[wtlin1228]

Oh, it hasn't been merged. I can rebase again later.

[SeanCassiere]

Please make the changes listed. It probably shouldn't affect any of your tests or snapshots.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 065a7a3

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	5m 41s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	41s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-07-07 03:35:19 UTC

[pkg-pr-new]

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commit: 065a7a3

[SeanCassiere]

@wtlin1228 thank you for working with us and contributing this!