fix

src/runtime/internal/Component.ts

@@ -1,9 +1,8 @@
 import { add_render_callback, flush, schedule_update } from './scheduler';
 import { current_component, set_current_component } from './lifecycle';
-import { blank_object, is_function, run, run_all } from './utils';
+import { blank_object, is_function, run, run_all, noop } from './utils';
 import { children, detach } from './dom';
 import { transition_in } from './transitions';
-import { noop } from './environment';
 
 export interface Fragment {
 	key: string|null;

src/runtime/internal/animations.ts

@@ -1,6 +1,5 @@
 import { run_transition } from './transitions';
-import { noop } from './environment';
-import { methodify } from './utils';
+import { methodify, noop } from './utils';
 import { CssTransitionConfig } from 'svelte/transition';
 
 type AnimationFn = (node: Element, { from, to }: { from: DOMRect; to: DOMRect }, params: any) => CssTransitionConfig;

src/runtime/internal/dev.ts

@@ -1,6 +1,5 @@
 import { custom_event, append, insert, detach, listen, attr } from './dom';
 import { SvelteComponent } from './Component';
-import { has_Symbol } from './environment';
 
 export function dispatch_dev<T=any>(type: string, detail?: T) {
 	document.dispatchEvent(custom_event(type, { version: '__VERSION__', ...detail }));
@@ -83,7 +82,7 @@ export function set_data_dev(text, data) {
 export function validate_each_argument(arg) {
 	if (typeof arg !== 'string' && !(arg && typeof arg === 'object' && 'length' in arg)) {
 		let msg = '{#each} only iterates over array-like objects.';
-		if (has_Symbol && arg && Symbol.iterator in arg) {
+		if (typeof Symbol === 'function' && arg && Symbol.iterator in arg) {
 			msg += ' You can use a spread to convert this iterable into an array.';
 		}
 		throw new Error(msg);
@@ -141,4 +140,4 @@ export function loop_guard(timeout) {
 			throw new Error(`Infinite loop detected`);
 		}
 	};
-}
+}

src/runtime/internal/dom.ts

@@ -1,5 +1,4 @@
 import { has_prop } from "./utils";
-import { is_cors } from "./environment";
 
 export function append(target: Node, node: Node) {
 	target.appendChild(node);
@@ -235,6 +234,26 @@ export function select_multiple_value(select) {
 	return [].map.call(select.querySelectorAll(':checked'), option => option.__value);
 }
 
+// unfortunately this can't be a constant as that wouldn't be tree-shakeable
+// so we cache the result instead
+let crossorigin: boolean;
+
+export function is_crossorigin() {
+	if (crossorigin === undefined) {
+		crossorigin = false;
+
+		try {
+			if (typeof window !== 'undefined' && window.parent) {
+				void window.parent.document;
+			}
+		} catch (error) {
+			crossorigin = true;
+		}
+	}
+
+	return crossorigin;
+}
+
 export function add_resize_listener(node: HTMLElement, fn: () => void) {
 	const computed_style = getComputedStyle(node);
 	const z_index = (parseInt(computed_style.zIndex) || 0) - 1;
@@ -251,9 +270,11 @@ export function add_resize_listener(node: HTMLElement, fn: () => void) {
 	iframe.setAttribute('aria-hidden', 'true');
 	iframe.tabIndex = -1;
 
+	const crossorigin = is_crossorigin();
+
 	let unsubscribe: () => void;
 
-	if (is_cors) {
+	if (crossorigin) {
 		iframe.src = `data:text/html,<script>onresize=function(){parent.postMessage(0,'*')}</script>`;
 		unsubscribe = listen(window, 'message', (event: MessageEvent) => {
 			if (event.source === iframe.contentWindow) fn();
@@ -268,7 +289,7 @@ export function add_resize_listener(node: HTMLElement, fn: () => void) {
 	append(node, iframe);
 
 	return () => {
-		if (is_cors) {
+		if (crossorigin) {
 			unsubscribe();
 		} else if (unsubscribe && iframe.contentWindow) {
 			unsubscribe();
@@ -333,4 +354,4 @@ export class HtmlTag {
 	d() {
 		this.n.forEach(detach);
 	}
-}
+}

src/runtime/internal/environment.ts

@@ -1,23 +1,12 @@
-export function noop() {}
-export const is_browser = typeof window !== 'undefined';
-export const is_iframe = is_browser && window.self !== window.top;
-export const is_cors =
-	is_iframe &&
-	/*#__PURE__*/ (() => {
-		try {
-			if (window.parent) void window.parent.document;
-			return false;
-		} catch (error) {
-			return true;
-		}
-	})();
-export const has_Symbol = typeof Symbol === 'function';
-/* eslint-disable no-var */
-declare var global: any;
-export const globals = is_browser ? window : typeof globalThis !== 'undefined' ? globalThis : global;
-export const resolved_promise = Promise.resolve();
-export let now = is_browser ? window.performance.now.bind(window.performance) : Date.now.bind(Date);
-export let raf = is_browser ? requestAnimationFrame : noop;
+import { noop } from './utils';
+
+export const is_client = typeof window !== 'undefined';
+
+export let now: () => number = is_client
+	? () => window.performance.now()
+	: () => Date.now();
+
+export let raf = is_client ? cb => requestAnimationFrame(cb) : noop;
 export let framerate = 1000 / 60;
 /*#__PURE__*/ raf((t1) => {
 	raf((d) => {
@@ -27,6 +16,11 @@ export let framerate = 1000 / 60;
 	});
 });
 
-/* tests only */
-export const set_now = (v) => void (now = v);
-export const set_raf = (fn) => void (raf = fn);
+// used internally for testing
+export function set_now(fn) {
+	now = fn;
+}
+
+export function set_raf(fn) {
+	raf = fn;
+}

src/runtime/internal/globals.ts

@@ -0,0 +1,7 @@
+declare const global: any;
+
+export const globals = (typeof window !== 'undefined'
+	? window
+	: typeof globalThis !== 'undefined'
+	? globalThis
+	: global) as unknown as typeof globalThis;

src/runtime/internal/loop.ts

@@ -1,4 +1,5 @@
-import { now, raf, framerate, noop } from './environment';
+import { now, raf, framerate } from './environment';
+import { noop } from './utils';
 type TaskCallback = (t: number) => boolean;
 type TaskCanceller = () => void;
 

src/runtime/internal/scheduler.ts

@@ -1,7 +1,9 @@
 import { set_current_component } from './lifecycle';
-import { resolved_promise, now } from './environment';
+import { now } from './environment';
 import { T$$ } from './Component';
 
+const resolved_promise = Promise.resolve();
+
 let update_scheduled = false;
 let is_flushing = false;
 

src/runtime/internal/transitions.ts

@@ -1,11 +1,11 @@
 import { CssTransitionConfig } from '../transition';
 import { Fragment } from './Component';
 import { custom_event } from './dom';
-import { now, noop } from './environment';
+import { now } from './environment';
 import { setFrameTimeout, setTweenTimeout } from './loop';
 import { add_measure_callback } from './scheduler';
 import { animate_css } from './style_manager';
-import { methodify } from './utils';
+import { methodify, noop } from './utils';
 
 type TransitionFn = (node: HTMLElement, params: any) => CssTransitionConfig;
 export type StopResetReverseFn = (t?: number | -1) => StopResetReverseFn | void;

src/runtime/internal/utils.ts

@@ -1,5 +1,4 @@
-import { noop } from "./environment";
-
+export function noop() {}
 export const identity = x => x;
 
 export function assign<T, S>(tar: T, src: S): T & S {