30 Legacy Svelte Component

In runes mode, <MyComponent> will re-render if the value of MyComponent changes. See the Svelte 5 migration guide for an example.

In legacy mode, it won't — we must use <svelte:component>, which destroys and recreates the component instance when the value of its this expression changes:

<svelte:component this={MyComponent} />

If this is falsy, no component is rendered.