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[2.0 next, regressed after rc.13] Loading on latest remains in fallback after a shared source settles

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
52/100
Tipo de issue
Error
Claridad
Bien especificado
Estado de actividad
Activo
Stack tecnológico
javascript, typescript
Área
frontend

Línea de trabajo

Start with the linked standalone reproduction, especially App.tsx and repro.test.ts, then run the documented Bun test against the same Solid build. Trace how the shared settled source is observed by both Loading boundaries. Done means the automated reproduction passes and both boundaries display 22 after clicking Load 2.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Describe the bug

A Loading boundary using latest(id) keeps its fallback after the source shared by both boundaries has resolved.

Your Example Website or App

Standalone reproduction

Steps to Reproduce the Bug or Issue
  1. Use the source below with the selected Solid build (complete setup is linked above).
import { createMemo, createSignal, latest, Loading } from "solid-js";
export default function App() {
  let finish!: (value: number) => void;
  const replacement = new Promise<number>((resolve) => {
    finish = resolve;
  });
  const [id, setId] = createSignal(0);
  const data = createMemo(() => (id() ? replacement : Promise.resolve(1)));
  function load() {
    setId(1); // Replace the source shared by both boundaries.
    setTimeout(() => finish(2), 20); // Every async source is now settled.
  }
  return (
    <>
      <button id="trigger" onClick={load}>
        Load 2
      </button>
      <div id="answer">
        <Loading on={latest(id)} fallback="A">
          <span>{data()}</span>
        </Loading>
        <Loading fallback="B">
          <b>{data()}</b>
        </Loading>
      </div>
    </>
  ); // Wait for 11, then click: it stays A2 rather than becoming 22.
}
  1. Paste into a Solid 2 playground. Wait for 11, then click Load 2 and wait.
Expected behavior

Expected: Both boundaries display the final value: 22.
Actual: The first boundary keeps its fallback: A2.

Platform
  • Solid: solid-js / @solidjs/web next at 3086f1b77cd7b0431d3a7f768c2984c335758633; comparison 2.0.0-rc.13. Signals, compiler and diagnostics match the selected Solid build.
  • OS: macOS 26.6.2 (25G83); browser cases: system Google Chrome 155.0.8059.40. Server-only/type checks run in Bun 1.4.2.
  • Builds/comparison: development and production fail. rc.13 passes in both builds.
Additional context

Both Loading boundaries read the same settled source, so both should leave their fallback without another user update.

Related: #2706, #2829, #3524

Full automated reproduction

One-command setup, run and expected output.

Copy the standalone files into a fresh Bun project. The displayed snippet is executed by snippet.test.ts. The original automated case is also retained.

bun init -y
bun add [email protected] @solidjs/[email protected] @solidjs/[email protected] @solidjs/[email protected] @solidjs/[email protected]
bun add -d playwright
bun run link-head.ts /absolute/path/to/built/solid
BUILD_MODE=development bun test ./snippet.test.ts

The five linked packages must come from the same built HEAD checkout. Omitting the link step selects the rc.13 comparison. Chrome runs use the system installation.

Lenguaje dominante
TypeScript
Estrellas
36.1k
Forks
1.1k
Merge medio
12 h 10 min
PR fusionados (30 d)
338

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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