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path: root/src/lib/Image/FallbackImage.svelte
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<script lang="ts">
  export let source: string | undefined | null;
  export let alternative: string | undefined | null;
  export let fallback: string | undefined | null;
  export let maxReplaceCount = 1;
  export let replaceDelay = 1000;
  export let error = 'https://i2.kym-cdn.com/photos/images/newsfeed/000/290/992/0aa.jpg';
  export let hideOnError = false;
  export let style = '';

  let replaceCount = 0;

  const delayedReplace = (event: Event, image: string | undefined | null) => {
    if (replaceCount >= maxReplaceCount) return;

    setTimeout(() => {
      (event.target as HTMLImageElement).src = image || '';

      replaceCount += 1;
    }, replaceDelay);
  };
</script>

{#if replaceCount < maxReplaceCount}
  <img
    src={source}
    alt={alternative}
    loading="lazy"
    class="badge"
    onerror={(e) => delayedReplace(e, fallback)}
    {style}
  />
{:else if !hideOnError}
  <img src={error} alt="Not found" loading="lazy" class="badge" />
{/if}

<style>
  .badge {
    border-radius: 8px;
  }
</style>