diff --git a/package-lock.json b/package-lock.json
index 68c6dbe..7ba2725 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "event-calendar",
-  "version": "3.4.0",
+  "version": "3.5.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "event-calendar",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dependencies": {
         "sirv-cli": "^2.0.2"
       },
@@ -15,14 +15,14 @@
         "@babel/plugin-transform-runtime": "^7.24.7",
         "@babel/preset-env": "^7.24.7",
         "@babel/runtime-corejs3": "^7.24.7",
-        "@event-calendar/build": "~3.4.0",
-        "@event-calendar/core": "~3.4.0",
-        "@event-calendar/day-grid": "~3.4.0",
-        "@event-calendar/interaction": "~3.4.0",
-        "@event-calendar/list": "~3.4.0",
-        "@event-calendar/resource-time-grid": "~3.4.0",
-        "@event-calendar/resource-timeline": "~3.4.0",
-        "@event-calendar/time-grid": "~3.4.0",
+        "@event-calendar/build": "~3.5.0",
+        "@event-calendar/core": "~3.5.0",
+        "@event-calendar/day-grid": "~3.5.0",
+        "@event-calendar/interaction": "~3.5.0",
+        "@event-calendar/list": "~3.5.0",
+        "@event-calendar/resource-time-grid": "~3.5.0",
+        "@event-calendar/resource-timeline": "~3.5.0",
+        "@event-calendar/time-grid": "~3.5.0",
         "@rollup/plugin-babel": "^6.0.4",
         "@rollup/plugin-commonjs": "^26.0.1",
         "@rollup/plugin-node-resolve": "^15.2.3",
@@ -35,7 +35,7 @@
         "rollup-plugin-scss": "^4.0.0",
         "rollup-plugin-svelte": "^7.2.2",
         "sass": "^1.77.6",
-        "svelte": "^4.2.18"
+        "svelte": "^4.2.19 || ^5.0.0-next.249"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -4033,9 +4033,10 @@
       }
     },
     "node_modules/svelte": {
-      "version": "4.2.18",
+      "version": "4.2.19",
+      "resolved": "https://registry.npmjs.org/svelte/-/svelte-4.2.19.tgz",
+      "integrity": "sha512-IY1rnGr6izd10B0A8LqsBfmlT5OILVuZ7XsI0vdGPEvuonFV7NYEUK4dAkm9Zg2q0Um92kYjTpS1CAP3Nh/KWw==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
         "@ampproject/remapping": "^2.2.1",
         "@jridgewell/sourcemap-codec": "^1.4.15",
@@ -4369,21 +4370,21 @@
     },
     "packages/build": {
       "name": "@event-calendar/build",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dev": true,
       "license": "MIT",
       "devDependencies": {
-        "@event-calendar/day-grid": "~3.4.0",
-        "@event-calendar/interaction": "~3.4.0",
-        "@event-calendar/list": "~3.4.0",
-        "@event-calendar/resource-time-grid": "~3.4.0",
-        "@event-calendar/resource-timeline": "~3.4.0",
-        "@event-calendar/time-grid": "~3.4.0"
+        "@event-calendar/day-grid": "~3.5.0",
+        "@event-calendar/interaction": "~3.5.0",
+        "@event-calendar/list": "~3.5.0",
+        "@event-calendar/resource-time-grid": "~3.5.0",
+        "@event-calendar/resource-timeline": "~3.5.0",
+        "@event-calendar/time-grid": "~3.5.0"
       }
     },
     "packages/core": {
       "name": "@event-calendar/core",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -4392,62 +4393,62 @@
     },
     "packages/day-grid": {
       "name": "@event-calendar/day-grid",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@event-calendar/core": "~3.4.0",
+        "@event-calendar/core": "~3.5.0",
         "svelte": "^4.2.16"
       }
     },
     "packages/interaction": {
       "name": "@event-calendar/interaction",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@event-calendar/core": "~3.4.0",
+        "@event-calendar/core": "~3.5.0",
         "svelte": "^4.2.16"
       }
     },
     "packages/list": {
       "name": "@event-calendar/list",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@event-calendar/core": "~3.4.0",
+        "@event-calendar/core": "~3.5.0",
         "svelte": "^4.2.16"
       }
     },
     "packages/resource-time-grid": {
       "name": "@event-calendar/resource-time-grid",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@event-calendar/core": "~3.4.0",
-        "@event-calendar/time-grid": "~3.4.0",
+        "@event-calendar/core": "~3.5.0",
+        "@event-calendar/time-grid": "~3.5.0",
         "svelte": "^4.2.16"
       }
     },
     "packages/resource-timeline": {
       "name": "@event-calendar/resource-timeline",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@event-calendar/core": "~3.4.0",
+        "@event-calendar/core": "~3.5.0",
         "svelte": "^4.2.16"
       }
     },
     "packages/time-grid": {
       "name": "@event-calendar/time-grid",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@event-calendar/core": "~3.4.0",
+        "@event-calendar/core": "~3.5.0",
         "svelte": "^4.2.16"
       }
     }
diff --git a/package.json b/package.json
index 0fb99d2..bacfbf0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "event-calendar",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "scripts": {
     "build": "rollup -c",
     "dev": "rollup -c -w",
@@ -13,14 +13,14 @@
     "@babel/plugin-transform-runtime": "^7.24.7",
     "@babel/preset-env": "^7.24.7",
     "@babel/runtime-corejs3": "^7.24.7",
-    "@event-calendar/build": "~3.4.0",
-    "@event-calendar/core": "~3.4.0",
-    "@event-calendar/day-grid": "~3.4.0",
-    "@event-calendar/interaction": "~3.4.0",
-    "@event-calendar/list": "~3.4.0",
-    "@event-calendar/resource-time-grid": "~3.4.0",
-    "@event-calendar/resource-timeline": "~3.4.0",
-    "@event-calendar/time-grid": "~3.4.0",
+    "@event-calendar/build": "~4.0.0",
+    "@event-calendar/core": "~4.0.0",
+    "@event-calendar/day-grid": "~4.0.0",
+    "@event-calendar/interaction": "~4.0.0",
+    "@event-calendar/list": "~4.0.0",
+    "@event-calendar/resource-time-grid": "~4.0.0",
+    "@event-calendar/resource-timeline": "~4.0.0",
+    "@event-calendar/time-grid": "~4.0.0",
     "@rollup/plugin-babel": "^6.0.4",
     "@rollup/plugin-commonjs": "^26.0.1",
     "@rollup/plugin-node-resolve": "^15.2.3",
@@ -33,7 +33,7 @@
     "rollup-plugin-scss": "^4.0.0",
     "rollup-plugin-svelte": "^7.2.2",
     "sass": "^1.77.6",
-    "svelte": "^4.2.18"
+    "svelte": "^4.2.19 || ^5.0.0-next.249"
   },
   "dependencies": {
     "sirv-cli": "^2.0.2"
diff --git a/packages/build/package.json b/packages/build/package.json
index b6679b7..29336be 100644
--- a/packages/build/package.json
+++ b/packages/build/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@event-calendar/build",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "title": "Event Calendar",
   "description": "Full-sized drag & drop event calendar with resource & timeline views",
   "keywords": [
@@ -20,11 +20,11 @@
   "jsdelivr": "event-calendar.min.js",
   "style": "event-calendar.min.css",
   "devDependencies": {
-    "@event-calendar/day-grid": "~3.4.0",
-    "@event-calendar/interaction": "~3.4.0",
-    "@event-calendar/list": "~3.4.0",
-    "@event-calendar/time-grid": "~3.4.0",
-    "@event-calendar/resource-time-grid": "~3.4.0",
-    "@event-calendar/resource-timeline": "~3.4.0"
+    "@event-calendar/day-grid": "~4.0.0",
+    "@event-calendar/interaction": "~4.0.0",
+    "@event-calendar/list": "~4.0.0",
+    "@event-calendar/time-grid": "~4.0.0",
+    "@event-calendar/resource-time-grid": "~4.0.0",
+    "@event-calendar/resource-timeline": "~4.0.0"
   }
 }
\ No newline at end of file
diff --git a/packages/core/package.json b/packages/core/package.json
index 29b81dd..6618955 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@event-calendar/core",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "title": "Event Calendar Core package",
   "description": "Full-sized drag & drop event calendar with resource & timeline views",
   "keywords": [
diff --git a/packages/core/src/Auxiliary.svelte b/packages/core/src/Auxiliary.svelte
index b171ee4..39c24a1 100644
--- a/packages/core/src/Auxiliary.svelte
+++ b/packages/core/src/Auxiliary.svelte
@@ -1,7 +1,6 @@
 <script>
     import {getContext} from 'svelte';
-    import {is_function} from 'svelte/internal';
-    import {debounce, toISOString, toLocalDate, toViewWithLocalDates} from './lib.js';
+    import {debounce, toISOString, toLocalDate, toViewWithLocalDates, is_function} from './lib.js';
 
     let {datesSet, _auxiliary, _activeRange, _queue, _view} = getContext('state');
 
diff --git a/packages/core/src/Calendar.svelte b/packages/core/src/Calendar.svelte
index 1ebef90..080da7a 100644
--- a/packages/core/src/Calendar.svelte
+++ b/packages/core/src/Calendar.svelte
@@ -1,7 +1,6 @@
 <script>
     import './styles/index.scss';
     import {setContext, beforeUpdate, afterUpdate} from 'svelte';
-    import {destroy_component, get_current_component} from 'svelte/internal';
     import {get} from 'svelte/store';
     import {diff} from './storage/options';
     import State from './storage/state';
@@ -24,8 +23,6 @@
     export let plugins = [];
     export let options = {};
 
-    let component = get_current_component();
-
     let state = new State(plugins, options);
     setContext('state', state);
 
@@ -114,10 +111,6 @@
         return null;
     }
 
-    export function destroy() {
-        destroy_component(component, true);
-    }
-
     export function next() {
         $date = nextDate($date, $duration);
         return this;
diff --git a/packages/core/src/lib/debounce.js b/packages/core/src/lib/debounce.js
index 2d67b40..7c2b2df 100644
--- a/packages/core/src/lib/debounce.js
+++ b/packages/core/src/lib/debounce.js
@@ -1,4 +1,4 @@
-import {run_all} from 'svelte/internal';
+import {run_all} from './utils.js';
 
 export function debounce(fn, handle, queueStore) {
     queueStore.update(queue => queue.set(handle, fn));
diff --git a/packages/core/src/lib/events.js b/packages/core/src/lib/events.js
index d12415d..0f29998 100644
--- a/packages/core/src/lib/events.js
+++ b/packages/core/src/lib/events.js
@@ -1,8 +1,7 @@
 import {addDay, datesEqual, createDate, cloneDate, setMidnight, toLocalDate, toISOString, noTimePart, copyTime} from './date';
 import {createElement} from './dom';
-import {assign, isArray} from './utils';
+import {assign, isArray, is_function} from './utils';
 import {toViewWithLocalDates} from './view';
-import {is_function} from 'svelte/internal';
 
 let eventId = 1;
 export function createEvents(input) {
diff --git a/packages/core/src/lib/stores.js b/packages/core/src/lib/stores.js
index 2b51c3b..812edce 100644
--- a/packages/core/src/lib/stores.js
+++ b/packages/core/src/lib/stores.js
@@ -1,5 +1,5 @@
 import {derived} from 'svelte/store';
-import {is_function} from 'svelte/internal';
+import {is_function} from './utils.js';
 import {toLocalDate} from './date';
 import {createResources} from './resources.js';
 
diff --git a/packages/core/src/lib/times.js b/packages/core/src/lib/times.js
index 4cecad5..f1e1723 100644
--- a/packages/core/src/lib/times.js
+++ b/packages/core/src/lib/times.js
@@ -1,6 +1,5 @@
-import {is_function} from 'svelte/internal';
 import {addDuration, cloneDate, createDuration, DAY_IN_SECONDS, toISOString, toSeconds} from './date.js';
-import {max as maxFn, min as minFn} from './utils.js';
+import {max as maxFn, min as minFn, is_function} from './utils.js';
 import {bgEvent} from './events.js';
 
 export function createTimes(date, $slotDuration, $_slotTimeLimits, $_intlSlotLabel) {
diff --git a/packages/core/src/lib/utils.js b/packages/core/src/lib/utils.js
index 8a47910..b33d2bb 100644
--- a/packages/core/src/lib/utils.js
+++ b/packages/core/src/lib/utils.js
@@ -29,3 +29,46 @@ export function symbol() {
 export function isArray(value) {
     return Array.isArray(value);
 }
+
+/** @param {Array<() => void>} arr */
+export function run_all(arr) {
+	for (var i = 0; i < arr.length; i++) {
+		arr[i]();
+	}
+}
+
+/**
+ * @param {any} thing
+ * @returns {thing is Function}
+ */
+export function is_function(thing) {
+	return typeof thing === 'function';
+}
+
+export const noop = () => {};
+
+
+/**
+ * Fires the handler once immediately (unless corresponding arg is set to `false`),
+ * then listens to the given events until the render effect context is destroyed
+ * @param {EventTarget} target
+ * @param {Array<string>} events
+ * @param {(event?: Event) => void} handler
+ * @param {any} call_handler_immediately
+ */
+export function listen(target, events, handler, call_handler_immediately = true) {
+	if (call_handler_immediately) {
+		handler();
+	}
+
+	for (var name of events) {
+		target.addEventListener(name, handler);
+	}
+
+	teardown(() => {
+		for (var name of events) {
+			target.removeEventListener(name, handler);
+		}
+	});
+}
+
diff --git a/packages/core/src/storage/state.js b/packages/core/src/storage/state.js
index 530ff42..1f6e225 100644
--- a/packages/core/src/storage/state.js
+++ b/packages/core/src/storage/state.js
@@ -1,5 +1,5 @@
 import {get, writable} from 'svelte/store';
-import {is_function, tick, noop, identity} from 'svelte/internal';
+import {tick} from 'svelte';
 import {createOptions, createParsers} from './options';
 import {
     activeRange,
@@ -12,7 +12,7 @@ import {
     viewTitle,
     view as view2  // hack to avoid a runtime error in SvelteKit dev mode (ReferenceError: view is not defined)
 } from './stores';
-import {keys, intl, intlRange} from '../lib.js';
+import {keys, intl, intlRange, is_function} from '../lib.js';
 
 export default class {
     constructor(plugins, input) {
@@ -57,7 +57,7 @@ export default class {
         // Interaction
         this._interaction = writable({});
         this._iEvents = writable([null, null]);  // interaction events: [drag/resize, pointer]
-        this._iClasses = writable(identity);  // interaction event css classes
+        this._iClasses = writable([]);  // interaction event css classes
         this._iClass = writable(undefined);  // interaction css class for entire calendar
 
         // Set & Get
diff --git a/packages/core/src/storage/stores.js b/packages/core/src/storage/stores.js
index 570f5e4..d9a2876 100644
--- a/packages/core/src/storage/stores.js
+++ b/packages/core/src/storage/stores.js
@@ -1,5 +1,5 @@
 import {derived, writable, readable, get} from 'svelte/store';
-import {is_function} from 'svelte/internal';
+import {is_function} from '../lib/utils.js';
 import {
     DAY_IN_SECONDS,
     assign,
diff --git a/packages/day-grid/package.json b/packages/day-grid/package.json
index 9d02ff5..a431205 100644
--- a/packages/day-grid/package.json
+++ b/packages/day-grid/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@event-calendar/day-grid",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "title": "Event Calendar DayGrid plugin",
   "description": "Full-sized drag & drop event calendar with resource & timeline views",
   "keywords": [
@@ -27,7 +27,7 @@
     "./package.json": "./package.json"
   },
   "dependencies": {
-    "@event-calendar/core": "~3.4.0",
+    "@event-calendar/core": "~4.0.0",
     "svelte": "^4.2.16"
   }
 }
\ No newline at end of file
diff --git a/packages/day-grid/src/Day.svelte b/packages/day-grid/src/Day.svelte
index 082f920..87d8a23 100644
--- a/packages/day-grid/src/Day.svelte
+++ b/packages/day-grid/src/Day.svelte
@@ -1,8 +1,7 @@
 <script>
     import {getContext, tick} from 'svelte';
-    import {is_function} from 'svelte/internal';
     import {datesEqual, setContent, createEventChunk, addDay, cloneDate, assign, setPayload, toISOString,
-        keyEnter, runReposition} from '@event-calendar/core';
+        keyEnter, runReposition, is_function} from '@event-calendar/core';
     import Event from './Event.svelte';
     import Popup from './Popup.svelte';
 
diff --git a/packages/day-grid/src/Event.svelte b/packages/day-grid/src/Event.svelte
index da56401..7e6969e 100644
--- a/packages/day-grid/src/Event.svelte
+++ b/packages/day-grid/src/Event.svelte
@@ -1,6 +1,5 @@
 <script>
     import {afterUpdate, getContext, onMount} from 'svelte';
-    import {is_function} from 'svelte/internal';
     import {
         ancestor,
         createEventClasses,
@@ -17,7 +16,8 @@
         keyEnter,
         task,
         rect,
-        bgEvent
+        bgEvent,
+        is_function
     } from '@event-calendar/core';
 
     export let chunk;
diff --git a/packages/interaction/package.json b/packages/interaction/package.json
index 9f4b59b..f871f2f 100644
--- a/packages/interaction/package.json
+++ b/packages/interaction/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@event-calendar/interaction",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "title": "Event Calendar Interaction plugin",
   "description": "Full-sized drag & drop event calendar with resource & timeline views",
   "keywords": [
@@ -27,7 +27,7 @@
     "./package.json": "./package.json"
   },
   "dependencies": {
-    "@event-calendar/core": "~3.4.0",
+    "@event-calendar/core": "~4.0.0",
     "svelte": "^4.2.16"
   }
 }
\ No newline at end of file
diff --git a/packages/interaction/src/Action.svelte b/packages/interaction/src/Action.svelte
index a3799a4..e41ceed 100644
--- a/packages/interaction/src/Action.svelte
+++ b/packages/interaction/src/Action.svelte
@@ -1,6 +1,5 @@
 <script>
     import {getContext} from 'svelte';
-    import {is_function, listen, run_all} from 'svelte/internal';
     import {
         addDay,
         addDuration,
@@ -18,7 +17,8 @@
         toISOString,
         toLocalDate,
         toViewWithLocalDates,
-        listView, timelineView
+        listView, timelineView,
+        is_function, listen, run_all
     } from '@event-calendar/core';
     import {animate, limit} from './utils';
 
diff --git a/packages/interaction/src/Auxiliary.svelte b/packages/interaction/src/Auxiliary.svelte
index 0b7471b..919344b 100644
--- a/packages/interaction/src/Auxiliary.svelte
+++ b/packages/interaction/src/Auxiliary.svelte
@@ -1,7 +1,6 @@
 <script>
     import {getContext} from 'svelte';
-    import {listen} from 'svelte/internal';
-    import {bgEvent, helperEvent} from '@event-calendar/core';
+    import {bgEvent, helperEvent, listen} from '@event-calendar/core';
     import Action from './Action.svelte';
     import Pointer from './Pointer.svelte';
     import Resizer from './Resizer.svelte';
diff --git a/packages/interaction/src/index.js b/packages/interaction/src/index.js
index b01d432..b29fa97 100644
--- a/packages/interaction/src/index.js
+++ b/packages/interaction/src/index.js
@@ -1,5 +1,5 @@
 import {writable} from 'svelte/store';
-import {noop} from 'svelte/internal';
+import {noop} from '@event-calendar/core';
 import Auxiliary from './Auxiliary.svelte';
 
 export default {
diff --git a/packages/list/package.json b/packages/list/package.json
index a7bc562..d6b8b6e 100644
--- a/packages/list/package.json
+++ b/packages/list/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@event-calendar/list",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "title": "Event Calendar List plugin",
   "description": "Full-sized drag & drop event calendar with resource & timeline views",
   "keywords": [
@@ -27,7 +27,7 @@
     "./package.json": "./package.json"
   },
   "dependencies": {
-    "@event-calendar/core": "~3.4.0",
+    "@event-calendar/core": "~4.0.0",
     "svelte": "^4.2.16"
   }
 }
\ No newline at end of file
diff --git a/packages/list/src/Body.svelte b/packages/list/src/Body.svelte
index 211df9f..b337967 100644
--- a/packages/list/src/Body.svelte
+++ b/packages/list/src/Body.svelte
@@ -1,7 +1,6 @@
 <script>
     import {getContext} from 'svelte';
-    import {is_function} from 'svelte/internal';
-    import {addDay, cloneDate, toViewWithLocalDates, setContent, bgEvent} from '@event-calendar/core';
+    import {addDay, cloneDate, toViewWithLocalDates, setContent, bgEvent, is_function} from '@event-calendar/core';
     import Day from './Day.svelte';
 
     let {_bodyEl, _events, _view, _viewDates, noEventsClick, noEventsContent, theme} = getContext('state');
diff --git a/packages/list/src/Event.svelte b/packages/list/src/Event.svelte
index fc34454..1254882 100644
--- a/packages/list/src/Event.svelte
+++ b/packages/list/src/Event.svelte
@@ -1,6 +1,5 @@
 <script>
     import {afterUpdate, getContext, onMount} from 'svelte';
-    import {is_function} from 'svelte/internal';
     import {
         createEventContent,
         toEventWithLocalDates,
@@ -10,7 +9,8 @@
         keyEnter,
         resourceBackgroundColor,
         resourceTextColor,
-        task
+        task,
+        is_function
     } from '@event-calendar/core';
 
     export let chunk;
diff --git a/packages/resource-time-grid/package.json b/packages/resource-time-grid/package.json
index 1476881..eb5efd1 100644
--- a/packages/resource-time-grid/package.json
+++ b/packages/resource-time-grid/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@event-calendar/resource-time-grid",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "title": "Event Calendar ResourceTimeGrid plugin",
   "description": "Full-sized drag & drop event calendar with resource & timeline views",
   "keywords": [
@@ -27,8 +27,8 @@
     "./package.json": "./package.json"
   },
   "dependencies": {
-    "@event-calendar/core": "~3.4.0",
-    "@event-calendar/time-grid": "~3.4.0",
+    "@event-calendar/core": "~4.0.0",
+    "@event-calendar/time-grid": "~4.0.0",
     "svelte": "^4.2.16"
   }
 }
\ No newline at end of file
diff --git a/packages/resource-time-grid/src/Label.svelte b/packages/resource-time-grid/src/Label.svelte
index 33dc7c6..b99db09 100644
--- a/packages/resource-time-grid/src/Label.svelte
+++ b/packages/resource-time-grid/src/Label.svelte
@@ -1,7 +1,6 @@
 <script>
     import {getContext, onMount, afterUpdate, createEventDispatcher} from 'svelte';
-    import {is_function} from 'svelte/internal';
-    import {setContent, toLocalDate} from '@event-calendar/core';
+    import {setContent, toLocalDate, is_function} from '@event-calendar/core';
 
     export let resource;
     export let date = undefined;
diff --git a/packages/resource-timeline/package.json b/packages/resource-timeline/package.json
index c2d4d80..3f09496 100644
--- a/packages/resource-timeline/package.json
+++ b/packages/resource-timeline/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@event-calendar/resource-timeline",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "title": "Event Calendar ResourceTimeline plugin",
   "description": "Full-sized drag & drop event calendar with resource & timeline views",
   "keywords": [
@@ -27,7 +27,7 @@
     "./package.json": "./package.json"
   },
   "dependencies": {
-    "@event-calendar/core": "~3.4.0",
+    "@event-calendar/core": "~4.0.0",
     "svelte": "^4.2.16"
   }
 }
\ No newline at end of file
diff --git a/packages/resource-timeline/src/Event.svelte b/packages/resource-timeline/src/Event.svelte
index 4f73e4a..2285f78 100644
--- a/packages/resource-timeline/src/Event.svelte
+++ b/packages/resource-timeline/src/Event.svelte
@@ -1,6 +1,5 @@
 <script>
     import {afterUpdate, getContext, onMount} from 'svelte';
-    import {is_function} from 'svelte/internal';
     import {
         createEventContent,
         createEventClasses,
@@ -12,7 +11,8 @@
         keyEnter,
         resourceBackgroundColor,
         resourceTextColor,
-        task, height, DAY_IN_SECONDS, toSeconds
+        task, height, DAY_IN_SECONDS, toSeconds,
+        is_function
     } from '@event-calendar/core';
     import {repositionEvent, getSlotTimeLimits} from './lib.js';
 
diff --git a/packages/resource-timeline/src/Label.svelte b/packages/resource-timeline/src/Label.svelte
index d791696..df76ca1 100644
--- a/packages/resource-timeline/src/Label.svelte
+++ b/packages/resource-timeline/src/Label.svelte
@@ -1,7 +1,6 @@
 <script>
     import {getContext, onMount} from 'svelte';
-    import {is_function} from 'svelte/internal';
-    import {setContent, toLocalDate} from '@event-calendar/core';
+    import {setContent, toLocalDate, is_function} from '@event-calendar/core';
 
     export let resource;
     export let date = undefined;
diff --git a/packages/time-grid/package.json b/packages/time-grid/package.json
index effbbc3..ff68a11 100644
--- a/packages/time-grid/package.json
+++ b/packages/time-grid/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@event-calendar/time-grid",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "title": "Event Calendar TimeGrid plugin",
   "description": "Full-sized drag & drop event calendar with resource & timeline views",
   "keywords": [
@@ -27,7 +27,7 @@
     "./package.json": "./package.json"
   },
   "dependencies": {
-    "@event-calendar/core": "~3.4.0",
+    "@event-calendar/core": "~4.0.0",
     "svelte": "^4.2.16"
   }
 }
\ No newline at end of file
diff --git a/packages/time-grid/src/Event.svelte b/packages/time-grid/src/Event.svelte
index 97192f2..68b5667 100644
--- a/packages/time-grid/src/Event.svelte
+++ b/packages/time-grid/src/Event.svelte
@@ -1,6 +1,5 @@
 <script>
     import {afterUpdate, getContext, onMount} from 'svelte';
-    import {is_function} from 'svelte/internal';
     import {
         createEventContent,
         createEventClasses,
@@ -13,7 +12,8 @@
         keyEnter,
         resourceBackgroundColor,
         resourceTextColor,
-        task
+        task,
+        is_function
     } from '@event-calendar/core';
 
     export let date;
diff --git a/packages/time-grid/src/all-day/Event.svelte b/packages/time-grid/src/all-day/Event.svelte
index 8ae3665..69d336e 100644
--- a/packages/time-grid/src/all-day/Event.svelte
+++ b/packages/time-grid/src/all-day/Event.svelte
@@ -1,6 +1,5 @@
 <script>
     import {afterUpdate, getContext, onMount} from 'svelte';
-    import {is_function} from 'svelte/internal';
     import {
         createEventClasses,
         createEventContent,
@@ -13,7 +12,8 @@
         resourceTextColor,
         helperEvent,
         keyEnter,
-        task, rect, ancestor, bgEvent
+        task, rect, ancestor, bgEvent,
+        is_function
     } from '@event-calendar/core';
 
     export let chunk;
diff --git a/packages/time-grid/src/utils.js b/packages/time-grid/src/utils.js
index 2d0a078..81d4b91 100644
--- a/packages/time-grid/src/utils.js
+++ b/packages/time-grid/src/utils.js
@@ -1,4 +1,4 @@
-import {is_function} from 'svelte/internal';
+import {is_function} from '@event-calendar/core';
 import {sortEventChunks} from '@event-calendar/core';
 
 export function groupEventChunks(chunks) {
diff --git a/rollup.config.js b/rollup.config.js
index 573a1e5..aca26e9 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -21,7 +21,7 @@ export default [
 			format: 'es',
 			file: 'packages/core/index.js'
 		},
-		external: ['svelte', 'svelte/internal', 'svelte/store'],
+		external: ['svelte', 'svelte/store'],
 		plugins: [
 			svelte({
 				compilerOptions: {
@@ -47,7 +47,7 @@ export default [
 			format: 'es',
 			file: 'packages/interaction/index.js'
 		},
-		external: ['@event-calendar/core', 'svelte', 'svelte/internal', 'svelte/store'],
+		external: ['@event-calendar/core', 'svelte', 'svelte/store'],
 		plugins: [
 			svelte({
 				compilerOptions: {
@@ -64,7 +64,7 @@ export default [
 			format: 'es',
 			file: 'packages/day-grid/index.js'
 		},
-		external: ['@event-calendar/core', 'svelte', 'svelte/internal', 'svelte/store'],
+		external: ['@event-calendar/core', 'svelte', 'svelte/store'],
 		plugins: [
 			svelte({
 				compilerOptions: {
@@ -81,7 +81,7 @@ export default [
 			format: 'es',
 			file: 'packages/list/index.js'
 		},
-		external: ['@event-calendar/core', 'svelte', 'svelte/internal', 'svelte/store'],
+		external: ['@event-calendar/core', 'svelte', 'svelte/store'],
 		plugins: [
 			svelte({
 				compilerOptions: {
@@ -98,7 +98,7 @@ export default [
 			format: 'es',
 			file: 'packages/time-grid/index.js'
 		},
-		external: ['@event-calendar/core', 'svelte', 'svelte/internal', 'svelte/store'],
+		external: ['@event-calendar/core', 'svelte', 'svelte/store'],
 		plugins: [
 			svelte({
 				compilerOptions: {
@@ -115,7 +115,7 @@ export default [
 			format: 'es',
 			file: 'packages/resource-time-grid/index.js'
 		},
-		external: ['@event-calendar/core', '@event-calendar/time-grid', 'svelte', 'svelte/internal', 'svelte/store'],
+		external: ['@event-calendar/core', '@event-calendar/time-grid', 'svelte', 'svelte/store'],
 		plugins: [
 			svelte({
 				compilerOptions: {
@@ -132,7 +132,7 @@ export default [
 			format: 'es',
 			file: 'packages/resource-timeline/index.js'
 		},
-		external: ['@event-calendar/core', 'svelte', 'svelte/internal', 'svelte/store'],
+		external: ['@event-calendar/core', 'svelte', 'svelte/store'],
 		plugins: [
 			svelte({
 				compilerOptions: {