This demonstrates how to use the simple `Toasts` component, but it *also* shows how to use a function provided by a component in Svelte.  The trick is to realize that functions are variables, and that Svelte will let you _bind_ variables.  You then simply have to do:

```
let send_toast;
```

In your script, and in your use of the component (`Toasts`) bind it like this:

```
<Toasts bind:send_toast />
```

Now when the Toasts component is loaded it will set _your_ `send_toast` variable to the function so you can call it.  In your component then you simple do:

```
export const send_toast = () => {
  // code here
}
```

Which will export it like a variable, but set it to `const` so Svelte doesn't complain that you aren't using it.