Stop inserting null placeholders for non-executed loaders in staticHandler.query

[brophdawg11]

Do not add null to staticHandler.query() loaderData if routes do not have loaders

This was an implementation detail required in Remix v2 because we used JSON.stringify() to serialize the loaderData of the client and it would strip undefined values which would cause issues for client-side router hydration. This should have been removed in React Router v7 because Single Fetch does not have the same restrictions but it was missed.

We used to check loaderData[routeId] !== undefined to see if a given route already had any data or not. Once we began allowing loaders to return undefined, our check of loaderData[routeId] !== undefined was no longer valid and we adjusted to a check of routeId in loaderData. This check can produce false positives if null values are inserted.

⚠️ This could be a "breaking bug fix" for manual SSR with createStaticHandler()/<StaticRouterProvider>, and using context.loaderData to control <RouterProvider> hydration behavior on the client.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4df618a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
react-router	Patch
@react-router/architect	Patch
@react-router/cloudflare	Patch
@react-router/dev	Patch
react-router-dom	Patch
@react-router/express	Patch
@react-router/node	Patch
@react-router/serve	Patch
@react-router/fs-routes	Patch
@react-router/remix-routes-option-adapter	Patch
create-react-router	Patch

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[github-actions]

🤖 Hello there,

We just published version 7.5.1-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 7.5.1 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!