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Install

npm install @sanity-labs/logo-soup
Requires Svelte 5 (runes). The adapter uses createSubscriber from svelte/reactivity (available since 5.7.0).

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createLogoSoup

The Svelte adapter exposes a createLogoSoup function that returns a reactive object. Reading its properties inside an $effect or template automatically subscribes to state changes. 
<script>
  import { createLogoSoup } from "@sanity-labs/logo-soup/svelte";
  import { getVisualCenterTransform } from "@sanity-labs/logo-soup";

  let { logos = [], baseSize = 48, scaleFactor = 0.5 } = $props();

  const soup = createLogoSoup();

  $effect(() => {
    soup.process({ logos, baseSize, scaleFactor });
  });

  $effect(() => {
    return () => soup.destroy();
  });
</script>

{#if soup.isReady}
  <div style="text-align: center;">
    {#each soup.normalizedLogos as logo (logo.src)}
      <img
        src={logo.croppedSrc || logo.src}
        alt={logo.alt}
        width={logo.normalizedWidth}
        height={logo.normalizedHeight}
        style:transform={getVisualCenterTransform(logo, "visual-center-y")}
        style:display="inline-block"
        style:margin="0 14px"
      />
    {/each}
  </div>
{/if}

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Reactive Properties

The object returned by createLogoSoup() exposes these reactive getters:
PropertyTypeDescription
stateLogoSoupStateRaw state snapshot from the engine
isLoadingbooleantrue while images are being loaded
isReadybooleantrue when normalization is complete
normalizedLogosNormalizedLogo[]The processed logos
errorError | nullSet if all images fail to load
And these methods:
MethodDescription
process(options)Trigger a processing run with new options
destroy()Clean up blob URLs and cancel in-flight work

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Reactive Options

Since $effect auto-tracks any reactive state ($state, $derived, $props) read inside it, changing any option value automatically re-triggers processing: 
<script>
  import { createLogoSoup } from "@sanity-labs/logo-soup/svelte";

  let logos = $state(["/logos/acme.svg", "/logos/globex.svg"]);
  let baseSize = $state(48);

  const soup = createLogoSoup();

  $effect(() => {
    // Re-runs whenever `logos` or `baseSize` changes
    soup.process({ logos, baseSize });
  });

  $effect(() => {
    return () => soup.destroy();
  });

  function addLogo(src) {
    logos = [...logos, src];
    // $effect above re-runs automatically
  }
</script>

<button onclick={() => addLogo("/logos/new.svg")}>Add logo</button>
<button onclick={() => baseSize = baseSize === 48 ? 64 : 48}>Toggle size</button>

{#if soup.isReady}
  {#each soup.normalizedLogos as logo (logo.src)}
    <img
      src={logo.src}
      alt={logo.alt}
      width={logo.normalizedWidth}
      height={logo.normalizedHeight}
    />
  {/each}
{/if}

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Dark Mode with Background Color

When displaying logos on a dark background, pass backgroundColor so Logo Soup can properly detect contrast and apply irradiation compensation: 
<script>
  import { createLogoSoup } from "@sanity-labs/logo-soup/svelte";

  let { logos = [] } = $props();
  let isDark = $state(false);

  const soup = createLogoSoup();

  $effect(() => {
    soup.process({
      logos,
      backgroundColor: isDark ? "#1a1a1a" : "#ffffff",
    });
  });

  $effect(() => {
    return () => soup.destroy();
  });
</script>

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Visual Center Alignment

Apply visual center alignment with the getVisualCenterTransform helper from the core package: 
<script>
  import { createLogoSoup } from "@sanity-labs/logo-soup/svelte";
  import { getVisualCenterTransform } from "@sanity-labs/logo-soup";

  // ...setup...
</script>

{#each soup.normalizedLogos as logo (logo.src)}
  <img
    src={logo.src}
    alt={logo.alt}
    width={logo.normalizedWidth}
    height={logo.normalizedHeight}
    style:transform={getVisualCenterTransform(logo, "visual-center-y")}
  />
{/each}
The function returns a CSS transform string like translate(0px, -2.3px) or undefined if no offset is needed.

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Reusable Component

Wrap it in a reusable Svelte component: 
<!-- LogoSoup.svelte -->
<script>
  import { createLogoSoup } from "@sanity-labs/logo-soup/svelte";
  import { getVisualCenterTransform } from "@sanity-labs/logo-soup";

  let {
    logos = [],
    baseSize = 48,
    scaleFactor = 0.5,
    alignBy = "visual-center-y",
    gap = 28,
    ...rest
  } = $props();

  const soup = createLogoSoup();

  $effect(() => {
    soup.process({ logos, baseSize, scaleFactor, ...rest });
  });

  $effect(() => {
    return () => soup.destroy();
  });

  const halfGap = $derived(
    typeof gap === "number" ? `${gap / 2}px` : `calc(${gap} / 2)`
  );
</script>

<div style="text-align: center; text-wrap: balance;">
  {#each soup.normalizedLogos as logo, i (logo.src + i)}
    <span
      style:display="inline-block"
      style:vertical-align="middle"
      style:padding={halfGap}
      style:opacity={soup.isLoading ? 0 : 1}
      style:transition="opacity 0.2s ease-in-out"
    >
      <img
        src={logo.croppedSrc || logo.src}
        alt={logo.alt}
        width={logo.normalizedWidth}
        height={logo.normalizedHeight}
        style:display="block"
        style:object-fit="contain"
        style:width="{logo.normalizedWidth}px"
        style:height="{logo.normalizedHeight}px"
        style:transform={getVisualCenterTransform(logo, alignBy)}
      />
    </span>
  {/each}
</div>
Usage: 
<script>
  import LogoSoup from "./LogoSoup.svelte";
</script>

<LogoSoup
  logos={["/logos/acme.svg", "/logos/globex.svg", "/logos/initech.svg"]}
  baseSize={48}
  gap={24}
/>

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How It Works Under the Hood

The Svelte adapter uses createSubscriber from svelte/reactivity (5.7+) to bridge the core engine’s subscribe/getSnapshot interface into Svelte’s runes-based reactivity:
  • createSubscriber returns a function that, when called inside a reactive context ($effect, template expression, $derived), registers the caller as a subscriber
  • Each getter (isReady, normalizedLogos, etc.) calls subscribe() before reading from the engine, making it automatically reactive
  • The engine itself is not duplicated into $state — it remains the single source of truth, with createSubscriber acting as the bridge
  • No legacy store contract ($: or subscribe method) is used — this is pure Svelte 5 runes