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Async, Streaming with Promises & Infinite Loop #16403

Open
@fmorency

Description

@fmorency

Describe the bug

The console gets spammed byTick updated at: messages. More than it should.

Note that I don't see this issue if I rename+page.server.ts to+page.ts.

Unclear to me if I'm doing something I shouldn't or if this is a real issue. Please be gentle.

Reproduction

+page.server.ts

exportconstload=async({fetch})=>{constres=awaitfetch('https://pokeapi.co/api/v2/pokemon/pikachu');return{data:res.json()}}

+page.svelte

<scriptlang="ts">importtype {PageProps}from"./$types";import {readable}from"svelte/store";import {invalidateAll}from"$app/navigation";const {data}:PageProps=$props();const tick=readable(Date.now(), (set)=> {const id=setInterval(()=>set(Date.now()),1000);return ()=>clearInterval(id);});$effect(()=> {if ($tick) {console.log("Tick updated at:",$tick);invalidateAll();  }});</script><main>  <svelte:boundary>    <p>{JSON.stringify((awaitdata.data),null,2)}</p>    {#snippetpending()}      <p>loading...</p>    {/snippet}  </svelte:boundary></main>

Logs

Tick updated at: 1752693977687 +page.svelte:16:13Tick updated at: 1752693977687 +page.svelte:16:13Tick updated at: 1752693977687 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13Tick updated at: 1752693978697 +page.svelte:16:13

System Info

System:    OS: Linux 6.15 Manjaro Linux    CPU: (8) x64 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz    Memory: 10.87 GB / 39.02 GB    Container: Yes    Shell: 5.9 - /bin/zsh  Binaries:    Node: 22.17.0 -~/.nvm/versions/node/v22.17.0/bin/node    Yarn: 1.22.21 -~/.nvm/versions/node/v20.9.0/bin/yarn    npm: 10.9.2 -~/.nvm/versions/node/v22.17.0/bin/npm    pnpm: 9.10.0 -~/.nvm/versions/node/v20.9.0/bin/pnpm    bun: 1.2.18 - /usr/bin/bun  Browsers:    Chromium: 138.0.7204.92  npmPackages:    svelte: 5.36.4 => 5.36.4

Severity

annoyance

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