How to import a Svelte component into a JS file

I'm working on a project using both of native JS and Svelte.And I worked on a Svelte component and I want to know how can I import this later into my JS file.

*index.js*// js code here alert('here is my sweet Svelte compoent');-- the svelte component must be here ---...//**MyComponent.svelte**<script>   ... the Svelte code ...</script><style>   ... the Svelte component's style ...</style><div>   ...   ...</div>