fix: ensure SvelteMap and SvelteSet work with generators in dev

Author: trueadm

.changeset/selfish-chicken-argue.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: ensure SvelteMap and SvelteSet work with generators in dev

packages/svelte/src/reactivity/map.js

@@ -1,5 +1,4 @@
 /** @import { Source } from '#client' */
-import { DEV } from 'esm-env';
 import { set, source } from '../internal/client/reactivity/sources.js';
 import { get } from '../internal/client/runtime.js';
 import { increment } from './utils.js';
@@ -21,9 +20,6 @@ export class SvelteMap extends Map {
 	constructor(value) {
 		super();
 
-		// If the value is invalid then the native exception will fire here
-		if (DEV) new Map(value);
-
 		if (value) {
 			for (var [key, v] of value) {
 				super.set(key, v);

packages/svelte/src/reactivity/set.js

@@ -1,5 +1,4 @@
 /** @import { Source } from '#client' */
-import { DEV } from 'esm-env';
 import { source, set } from '../internal/client/reactivity/sources.js';
 import { get } from '../internal/client/runtime.js';
 import { increment } from './utils.js';
@@ -25,11 +24,8 @@ export class SvelteSet extends Set {
 	constructor(value) {
 		super();
 
-		// If the value is invalid then the native exception will fire here
-		if (DEV) new Set(value);
-
 		if (value) {
-			for (var element of value) {
+			for (let element of value) {
 				super.add(element);
 			}
 			this.#size.v = super.size;