TanStack / TanStack/db

Nextjs electricsql double rerender

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Dominant language
TypeScript
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Description

Why does useLiveQuery re-render twice?

next config:

    reactStrictMode: false,

package.json

    "@tanstack/electric-db-collection": "^0.2.13",
    "@tanstack/react-db": "^0.1.56",
    "react": "^19.2.0",
    "react-dom": "^19.2.0",
    "next": "^16.0.6",
import { electricCollectionOptions } from "@tanstack/electric-db-collection";
import { createCollection, useLiveQuery } from "@tanstack/react-db";

  const workspaceContentCollection = useMemo(() => {
    return createCollection(
      electricCollectionOptions({
        shapeOptions: {
          id: "sync_workspace_content",
          url: "http://localhost:4000/sync/workspace_content",
          params: {
            table: "workspace_content",
            workspace_id: asyncParams.workspace_id,
          },
          headers: {
            Authorization: `Bearer ${authToken}`,
          },
        },
        getKey: (item) => item.id,
      }),
    );
  }, [asyncParams.workspace_id]);

  const {
    data: workspace_content,
    status,
    isLoading,
  } = useLiveQuery((q) =>
    q
      .from({ workspace_content: workspaceContentCollection })
      .where(({ workspace_content }) =>
        eq(workspace_content.workspace_id, BigInt(asyncParams.workspace_id)),
      ),
  );

 console.log("status");
 console.log(status);

output:

status
loading

status
loading

status
ready

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the provided Next.js component and compare the useLiveQuery status transitions against the listed @tanstack/react-db and @tanstack/electric-db-collection versions. Reproduce the loading/loading/ready sequence with reactStrictMode disabled, then trace the collection and query lifecycle to determine whether the duplicate render is expected. Done means the cause is documented and a regression test or clear reproduction result is available.

Written by the indexing model from the issue text.

Assessment

Tech stack
next.js, react, typescript
Domain
frontend, web-dev
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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