src/lib/Layout/TextTransition.svelte


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<script>
  import { tweened } from 'svelte/motion';
  import { cubicOut } from 'svelte/easing';

  export let text = '';
  export let opacityTransitionDuration = 50;
  export let blurTransitionDuration = opacityTransitionDuration;
  export let easing = cubicOut;

  let previousValue = '';
  let opacity = tweened(1, { duration: opacityTransitionDuration, easing });
  let blur = tweened(0, { duration: blurTransitionDuration, easing });

  $: {
    if (text !== previousValue)
      Promise.all([opacity.set(0), blur.set(10)]).then(() => {
        previousValue = text;

        Promise.all([opacity.set(1), blur.set(0)]);
      });
  }
</script>

<span
  style="opacity: {$opacity}; filter: blur({$blur}px); transition: opacity {opacityTransitionDuration}ms, filter {blurTransitionDuration}ms;"
>
  {previousValue}
</span>