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A live hole silently stops re-emitting when its markup has a conditional on a property (`{m.usage && …}`)

Aperta
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Valutazione

Difficoltà
5/5
Tempo stimato
Più di una settimana
Idoneità per principianti
15/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
javascript, typescript
Ambito
compilers, frontend

Direzione di ricerca

Start with the repro in the issue: a live GET server component whose markup holds a createMemo over an async source, with a {m.usage && <b>done</b>} conditional inside a .map() row. Compare the streamed hole events with and without the conditional, as the issue's table does. The likely area is how the compiler memoises conditionals whose condition is a property access, and how a memo created inside a re-running hole is tracked. The existing chat example's comment about owner creation is a lead. Done means the hole re-emits, or a dev diagnostic names the expression.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

bug

Describe the bug

In a live server component, a markup hole stops re-emitting, silently, when the expression it renders contains a conditional whose condition is a property access. The first render is correct. After that the hole is never sent again, however often its source yields. There is no error, no warning and no diagnostic, on the server or in the browser. Slot arguments in the same component keep updating, which makes it look like a client problem.

What it takes

A live(GET(…)) server function that answers with a component, with a memo over an async iterable read in its markup:

const getThread = liveQuery(
  live(
    GET(async (id: string) => {
      "use server";
      return (props: { composer: ComposerSlot }) => {
        const view = createMemo(() => db.watchThread(id, signal)); // yields the thread on every write
        return (
          <article>
            <ol>
              {view().messages.map(m => (
                <li data-id={m.id}>
                  {m.text.length} {m.usage && <b>done</b>}
                </li>
              ))}
            </ol>
            <props.composer seen={view().messages.map(m => m.id)} />
          </article>
        );
      };
    })
  ),
  "thread"
);

m.usage is undefined until a reply finishes; m.text grows about every 50 ms while one is being written.

What happens

I connected to the live address with curl -N for the length of one reply (about 40 writes to the thread) and counted the events on the stream, changing only the expression inside the <li>:

Inside the <li> hole events for the list slot-argument events
{m.text.length} 39 43
{m.text.length} {m.usage && <b>done</b>} 0 43
{m.text.length} {m.usage ? <b>done</b> : null} 0 43
const usage = m.usage; then {m.text.length} {usage && <b>done</b>} 39 43

In the two failing rows the stream carries the initial html event, with the list registered as a hole and given a digest, and then nothing more for it. In the browser the list stays as first rendered while the composer's seen prop keeps changing.

The same happens when the conditional is inside a plain helper function called from the hole, and with <For> in place of .map(). A condition that is a local identifier (generating && …, where const generating = m.status === "generating") is fine.

What I think is going on

Not established; a reading of the symptoms. The compiler memoises a conditional whose condition it cannot see through (a.b && …, a.b ? … : …). The existing chat example's comments say a live hole "can't mint components as it grows" (an owner-creation latch). A memo created inside a hole on each re-run looks like the same thing, with the difference that nothing reports it and the hole goes quiet instead.

Expected

Either the hole re-emits, or, if creating a memo inside a re-running hole is not supported, a dev diagnostic says so and names the expression. As it stands the markup is silently stale, and the workaround (hoist the property into a local) is not something a reader would guess.

Notes

  • Found while rebuilding the chat example as a live server component. It first appeared as {message.reasoning && <details>…} and {message.usage && <span>…} in a message's markup, and took a bisect of the raw stream to find.
  • Related, and loud rather than silent: a memo over an async source created per row inside the list (createMemo(() => db.watchMessage(id)) in a row component) fails the document render with <Loading> boundary discovery did not converge after 10001 passes. That one at least says something.

Environment

  • solidjs/solid next at df4e36516, dev build of solid-js and @solidjs/web from the workspace
  • @solidjs/router 2.0.0-next.38, @solidjs/vite-plugin 3.0.0-next.49, Vite 8, dev server
  • macOS, Node 26; the stream was read with curl, the page in Chromium 152
Lingua principale
TypeScript
Stelle
36.1k
Fork
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Merge medio
10h 42m
PR unite (30g)
361

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