why was that there

Author: Rich-Harris

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/element.js

@@ -2,10 +2,9 @@
 /** @import { Attribute, ClassDirective, DelegatedEvent, ExpressionMetadata, ExpressionTag, Namespace, OnDirective, RegularElement, StyleDirective, SvelteElement, SvelteNode } from '#compiler' */
 /** @import { ComponentContext } from '../../types' */
 import { ATTRIBUTE_ALIASES } from '../../../../../../constants.js';
-import { is_capture_event } from '../../../../../../utils.js';
+import { is_capture_event, is_passive_event } from '../../../../../../utils.js';
 import { get_attribute_expression } from '../../../../../utils/ast.js';
 import * as b from '../../../../../utils/builders.js';
-import { PassiveEvents } from '../../../../constants.js';
 import { serialize_get_binding } from '../../utils.js';
 import { serialize_event_handler, serialize_template_literal, serialize_update } from './utils.js';
 
@@ -236,7 +235,7 @@ export function serialize_event(node, metadata, context) {
 		} else if (node.modifiers.includes('nonpassive')) {
 			args.push(b.literal(false));
 		} else if (
-			PassiveEvents.includes(node.name) &&
+			is_passive_event(node.name) &&
 			/** @type {OnDirective} */ (node).type !== 'OnDirective'
 		) {
 			// For on:something events we don't apply passive behaviour to match Svelte 4.

packages/svelte/src/compiler/phases/constants.js

@@ -9,8 +9,6 @@ export const DOMProperties = [
 	...DOM_BOOLEAN_ATTRIBUTES
 ];
 
-export const PassiveEvents = ['wheel', 'touchstart', 'touchmove', 'touchend', 'touchcancel'];
-
 export const Runes = /** @type {const} */ ([
 	'$state',
 	'$state.frozen',

packages/svelte/src/internal/client/render.js

@@ -22,7 +22,7 @@ import { reset_head_anchor } from './dom/blocks/svelte-head.js';
 import * as w from './warnings.js';
 import * as e from './errors.js';
 import { assign_nodes } from './dom/template.js';
-import { PassiveEvents } from '../../compiler/phases/constants.js';
+import { is_passive_event } from '../../utils.js';
 
 /**
  * This is normally true — block effects should run their intro transitions —
@@ -191,7 +191,7 @@ function _mount(Component, { target, anchor, props = {}, events, context, intro
 			if (registered_events.has(event_name)) continue;
 			registered_events.add(event_name);
 
-			var passive = PassiveEvents.includes(event_name);
+			var passive = is_passive_event(event_name);
 
 			// Add the event listener to both the container and the document.
 			// The container listener ensures we catch events from within in case

packages/svelte/src/utils.js

@@ -179,3 +179,13 @@ export const DOM_BOOLEAN_ATTRIBUTES = [
 export function is_boolean_attribute(name) {
 	return DOM_BOOLEAN_ATTRIBUTES.includes(name);
 }
+
+const PASSIVE_EVENTS = ['wheel', 'touchstart', 'touchmove', 'touchend', 'touchcancel'];
+
+/**
+ * Returns `true` if `name` is a passive event
+ * @param {string} name
+ */
+export function is_passive_event(name) {
+	return PASSIVE_EVENTS.includes(name);
+}