fix tests

src/runtime/internal/Component.ts

@@ -177,7 +177,7 @@ export function init(component, options, instance, create_fragment, not_equal, p
 }
 
 export let SvelteElement;
-if (is_function(HTMLElement)) {
+if (typeof HTMLElement === 'function') {
 	SvelteElement = class extends HTMLElement {
 		$$: T$$;
 		$$set?: ($$props: any) => void;

src/runtime/internal/index.ts

@@ -13,3 +13,4 @@ export * from './transitions';
 export * from './utils';
 export * from './Component';
 export * from './dev';
+export * from './constants';

src/runtime/motion/spring.ts

@@ -1,7 +1,6 @@
 import { Readable, writable } from 'svelte/store';
-import { loop, now, Task } from 'svelte/internal';
+import { loop, now, Task, resolved_promise } from 'svelte/internal';
 import { is_date } from './utils';
-import { resolved_promise } from 'svelte/internal/constants';
 
 interface TickContext<T> {
 	inv_mass: number;

src/runtime/motion/tweened.ts

@@ -1,8 +1,7 @@
 import { Readable, writable } from 'svelte/store';
-import { assign, loop, now, Task, is_function } from 'svelte/internal';
+import { assign, loop, now, Task, is_function, resolved_promise } from 'svelte/internal';
 import { linear } from 'svelte/easing';
 import { is_date } from './utils';
-import { resolved_promise } from 'svelte/internal/constants';
 
 function get_interpolator(a, b) {
 	if (a === b || a !== a) return () => a;