How to react to slot change?

Question

JavaScript

There is a component

<template>
  <pre>
    <slot></slot>
  </pre>
</template>

in the mounted event, I receive its value as this.$el.innerHTML , process it and again assign it to this.$el.innerHTML .
However, if I change the slot, i.e. I output as I change textSlota, then the text is no longer converted, but is displayed "as is". How to finalize the component so that when the textSlota changes, the transformation is called? Some event or maybe my approach is not correct,
<s-component>{{ textSlota }}</s-component>