diff --git a/documentation/docs/02-runes/04-$effect.md b/documentation/docs/02-runes/04-$effect.md
index da24084d4dd0..e346bceba81c 100644
--- a/documentation/docs/02-runes/04-$effect.md
+++ b/documentation/docs/02-runes/04-$effect.md
@@ -2,15 +2,11 @@
 title: $effect
 ---
 
-Effects are what make your application _do things_. When Svelte runs an effect function, it tracks which pieces of state (and derived state) are accessed (unless accessed inside [`untrack`](svelte#untrack)), and re-runs the function when that state later changes.
+Effects are functions that run when state updates, and can be used for things like calling third-party libraries, drawing on `<canvas>` elements, or making network requests. They only run in the browser, not during server-side rendering.
 
-Most of the effects in a Svelte app are created by Svelte itself — they're the bits that update the text in `<h1>hello {name}!</h1>` when `name` changes, for example.
+Generally speaking, you should _not_ update state inside effects, as it will make code more convoluted and will often lead to never-ending update cycles. If you find yourself doing so, see [when not to use `$effect`](#When-not-to-use-$effect) to learn about alternative approaches.
 
-But you can also create your own effects with the `$effect` rune, which is useful when you need to synchronize an external system (whether that's a library, or a `<canvas>` element, or something across a network) with state inside your Svelte app.
-
-> [!NOTE] Avoid overusing `$effect`! When you do too much work in effects, code often becomes difficult to understand and maintain. See [when not to use `$effect`](#When-not-to-use-$effect) to learn about alternative approaches.
-
-Your effects run after the component has been mounted to the DOM, and in a [microtask](https://developer.mozilla.org/en-US/docs/Web/API/HTML_DOM_API/Microtask_guide) after state changes ([demo](/playground/untitled#H4sIAAAAAAAAE31S246bMBD9lZF3pSRSAqTVvrCAVPUP2sdSKY4ZwJJjkD0hSVH-vbINuWxXfQH5zMyZc2ZmZLVUaFn6a2R06ZGlHmBrpvnBvb71fWQHVOSwPbf4GS46TajJspRlVhjZU1HqkhQSWPkHIYdXS5xw-Zas3ueI6FRn7qHFS11_xSRZhIxbFtcDtw7SJb1iXaOg5XIFeQGjzyPRaevYNOGZIJ8qogbpe8CWiy_VzEpTXiQUcvPDkSVrSNZz1UlW1N5eLcqmpdXUvaQ4BmqlhZNUCgxuzFHDqUWNAxrYeUM76AzsnOsdiJbrBp_71lKpn3RRbii-4P3f-IMsRxS-wcDV_bL4PmSdBa2wl7pKnbp8DMgVvJm8ZNskKRkEM_OzyOKQFkgqOYBQ3Nq89Ns0nbIl81vMFN-jKoLMTOr-SOBOJS-Z8f5Y6D1wdcR8dFqvEBdetK-PHwj-z-cH8oHPY54wRJ8Ys7iSQ3Bg3VA9azQbmC9k35kKzYa6PoVtfwbbKVnBixBiGn7Pq0rqJoUtHiCZwAM3jdTPWCVtr_glhVrhecIa3vuksJ_b7TqFs4DPyriSjd5IwoNNQaAmNI-ESfR2p8zimzvN1swdCkvJHPH6-_oX8o1SgcIDAAA=)):
+You can create an effect with the `$effect` rune ([demo](/playground/untitled#H4sIAAAAAAAAE31S246bMBD9lZF3pSRSAqTVvrCAVPUP2sdSKY4ZwJJjkD0hSVH-vbINuWxXfQH5zMyZc2ZmZLVUaFn6a2R06ZGlHmBrpvnBvb71fWQHVOSwPbf4GS46TajJspRlVhjZU1HqkhQSWPkHIYdXS5xw-Zas3ueI6FRn7qHFS11_xSRZhIxbFtcDtw7SJb1iXaOg5XIFeQGjzyPRaevYNOGZIJ8qogbpe8CWiy_VzEpTXiQUcvPDkSVrSNZz1UlW1N5eLcqmpdXUvaQ4BmqlhZNUCgxuzFHDqUWNAxrYeUM76AzsnOsdiJbrBp_71lKpn3RRbii-4P3f-IMsRxS-wcDV_bL4PmSdBa2wl7pKnbp8DMgVvJm8ZNskKRkEM_OzyOKQFkgqOYBQ3Nq89Ns0nbIl81vMFN-jKoLMTOr-SOBOJS-Z8f5Y6D1wdcR8dFqvEBdetK-PHwj-z-cH8oHPY54wRJ8Ys7iSQ3Bg3VA9azQbmC9k35kKzYa6PoVtfwbbKVnBixBiGn7Pq0rqJoUtHiCZwAM3jdTPWCVtr_glhVrhecIa3vuksJ_b7TqFs4DPyriSjd5IwoNNQaAmNI-ESfR2p8zimzvN1swdCkvJHPH6-_oX8o1SgcIDAAA=)):
 
 ```svelte
 <script>
@@ -32,11 +28,19 @@ Your effects run after the component has been mounted to the DOM, and in a [micr
 <canvas bind:this={canvas} width="100" height="100" />
 ```
 
-Re-runs are batched (i.e. changing `color` and `size` in the same moment won't cause two separate runs), and happen after any DOM updates have been applied.
+When Svelte runs an effect function, it tracks which pieces of state (and derived state) are accessed (unless accessed inside [`untrack`](svelte#untrack)), and re-runs the function when that state later changes.
+
+> [!NOTE] If you're having difficulty understanding why your `$effect` is rerunning or is not running see [understanding dependencies](#Understanding-dependencies). Effects are triggered differently than the `$:` blocks you may be used to if coming from Svelte 4.
+
+### Understanding lifecycle
 
-You can place `$effect` anywhere, not just at the top level of a component, as long as it is called during component initialization (or while a parent effect is active). It is then tied to the lifecycle of the component (or parent effect) and will therefore destroy itself when the component unmounts (or the parent effect is destroyed).
+Your effects run after the component has been mounted to the DOM, and in a [microtask](https://developer.mozilla.org/en-US/docs/Web/API/HTML_DOM_API/Microtask_guide) after state changes. Re-runs are batched (i.e. changing `color` and `size` in the same moment won't cause two separate runs), and happen after any DOM updates have been applied.
 
-You can return a function from `$effect`, which will run immediately before the effect re-runs, and before it is destroyed ([demo](/playground/untitled#H4sIAAAAAAAAE42RQY-bMBCF_8rI2kPopiXpMQtIPfbeW6m0xjyKtWaM7CFphPjvFVB2k2oPe7LmzXzyezOjaqxDVKefo5JrD3VaBLVXrLu5-tb3X-IZTmat0hHv6cazgCWqk8qiCbaXouRSHISMH1gop4coWrA7JE9bp7PO2QjjuY5vA8fDYZ3hUh7QNDCy2yWUFzTOUilpSj9aG-linaMKFGACtKCmSwvGGYGeLQvCWbtnMq3m34grajxHoa1JOUXI93_V_Sfz7Oz7Mafj0ypN-zvHm8dSAmQITP_xaUq2IU1GO1dp80I2Uh_82dao92Rl9R8GvgF0QrbrUFstcFeq0PgAkha0LoICPoeB4w1SJUvsZcj4rvcMlvmvGlGCv6J-DeSgw2vabQnJlm55p7nM0rcTctYei3HZxZSl7XHVqkHEM3k2zpqXfFyj393zU05fpyI6f0HI0hUoPoamC9roKDeo2ivBH1EnCQOmX9NfYw2GHrgCAAA=)).
+You can use `$effect` anywhere, not just at the top level of a component, as long as it is called while a parent effect is running.
+
+> [!NOTE] Svelte uses effects internally to represent logic and expressions in your template — this is how `<h1>hello {name}!</h1>` updates when `name` changes.
+
+An effect can return a _teardown function_ which will run immediately before the effect re-runs ([demo](/playground/untitled#H4sIAAAAAAAAE42SQVODMBCF_8pOxkPRKq3HCsx49K4n64xpskjGkDDJ0tph-O8uINo6HjxB3u7HvrehE07WKDbiyZEhi1osRWksRrF57gQdm6E2CKx_dd43zU3co6VB28mIf-nKO0JH_BmRRRVMQ8XWbXkAgfKtI8jhIpIkXKySu7lSG2tNRGZ1_GlYr1ZTD3ddYFmiosUigbyAbpC2lKbwWJkIB8ZhhxBQBWRSw6FCh3sM8GrYTthL-wqqku4N44TyqEgwF3lmRHr4Op0PGXoH31c5rO8mqV-eOZ49bikgtcHBL55tmhIkEMqg_cFB2TpFxjtg703we6NRL8HQFCS07oSUCZi6Rm04lz1yytIHBKoQpo1w6Gsm4gmyS8b8Y5PydeMdX8gwS2Ok4I-ov5NZtvQde95GMsccn_1wzNKfu3RZtS66cSl9lvL7qO1aIk7knbJGvefdtIOzi73M4bYvovUHDFk6AcX_0HRESxnpBOW_jfCDxIZCi_1L_wm4xGQ60wIAAA==)).
 
 ```svelte
 <script>
@@ -50,7 +54,7 @@ You can return a function from `$effect`, which will run immediately before the
 		}, milliseconds);
 
 		return () => {
-			// if a callback is provided, it will run
+			// if a teardown function is provided, it will run
 			// a) immediately before the effect re-runs
 			// b) when the component is destroyed
 			clearInterval(interval);
@@ -64,9 +68,11 @@ You can return a function from `$effect`, which will run immediately before the
 <button onclick={() => (milliseconds /= 2)}>faster</button>
 ```
 
+Teardown functions also run when the effect is destroyed, which happens when its parent is destroyed (for example, a component is unmounted) or the parent effect re-runs.
+
 ### Understanding dependencies
 
-`$effect` automatically picks up any reactive values (`$state`, `$derived`, `$props`) that are _synchronously_ read inside its function body (including indirectly, via function calls) and registers them as dependencies. When those dependencies change, the `$effect` schedules a rerun.
+`$effect` automatically picks up any reactive values (`$state`, `$derived`, `$props`) that are _synchronously_ read inside its function body (including indirectly, via function calls) and registers them as dependencies. When those dependencies change, the `$effect` schedules a re-run.
 
 Values that are read _asynchronously_ — after an `await` or inside a `setTimeout`, for example — will not be tracked. Here, the canvas will be repainted when `color` changes, but not when `size` changes ([demo](/playground/untitled#H4sIAAAAAAAAE31T246bMBD9lZF3pWSlBEirfaEQqdo_2PatVIpjBrDkGGQPJGnEv1e2IZfVal-wfHzmzJyZ4cIqqdCy9M-F0blDlnqArZjmB3f72XWRHVCRw_bc4me4aDWhJstSlllhZEfbQhekkMDKfwg5PFvihMvX5OXH_CJa1Zrb0-Kpqr5jkiwC48rieuDWQbqgZ6wqFLRcvkC-hYvnkWi1dWqa8ESQTxFRjfQWsOXiWzmr0sSLhEJu3p1YsoJkNUcdZUnN9dagrBu6FVRQHAM10sJRKgUG16bXcGxQ44AGdt7SDkTDdY02iqLHnJVU6hedlWuIp94JW6Tf8oBt_8GdTxlF0b4n0C35ZLBzXb3mmYn3ae6cOW74zj0YVzDNYXRHFt9mprNgHfZSl6mzml8CMoLvTV6wTZIUDEJv5us2iwMtiJRyAKG4tXnhl8O0yhbML0Wm-B7VNlSSSd31BG7z8oIZZ6dgIffAVY_5xdU9Qrz1Bnx8fCfwtZ7v8Qc9j3nB8PqgmMWlHIID6-bkVaPZwDySfWtKNGtquxQ23Qlsq2QJT0KIqb8dL0up6xQ2eIBkAg_c1FI_YqW0neLnFCqFpwmreedJYT7XX8FVOBfwWRhXstZrSXiwKQjUhOZeMIleb5JZfHWn2Yq5pWEpmR7Hv-N_wEqT8hEEAAA=)):
 
diff --git a/documentation/docs/07-misc/07-v5-migration-guide.md b/documentation/docs/07-misc/07-v5-migration-guide.md
index 94ade6e88796..87ff40cf472e 100644
--- a/documentation/docs/07-misc/07-v5-migration-guide.md
+++ b/documentation/docs/07-misc/07-v5-migration-guide.md
@@ -51,6 +51,8 @@ A `$:` statement could also be used to create side effects. In Svelte 5, this is
 </script>
 ```
 
+Note that [when `$effect` runs is different]($effect#Understanding-dependencies) than when `$:` runs.
+
 > [!DETAILS] Why we did this
 > `$:` was a great shorthand and easy to get started with: you could slap a `$:` in front of most code and it would somehow work. This intuitiveness was also its drawback the more complicated your code became, because it wasn't as easy to reason about. Was the intent of the code to create a derivation, or a side effect? With `$derived` and `$effect`, you have a bit more up-front decision making to do (spoiler alert: 90% of the time you want `$derived`), but future-you and other developers on your team will have an easier time.
 >
diff --git a/packages/svelte/CHANGELOG.md b/packages/svelte/CHANGELOG.md
index 44f1f7cb7972..a05938dacce3 100644
--- a/packages/svelte/CHANGELOG.md
+++ b/packages/svelte/CHANGELOG.md
@@ -1,5 +1,15 @@
 # svelte
 
+## 5.22.6
+
+### Patch Changes
+
+- fix: skip `log_if_contains_state` if only logging literals ([#15468](https://github.com/sveltejs/svelte/pull/15468))
+
+- fix: Add `closedby` property to HTMLDialogAttributes type ([#15458](https://github.com/sveltejs/svelte/pull/15458))
+
+- fix: null and warnings for local handlers ([#15460](https://github.com/sveltejs/svelte/pull/15460))
+
 ## 5.22.5
 
 ### Patch Changes
diff --git a/packages/svelte/elements.d.ts b/packages/svelte/elements.d.ts
index 6d256b56205c..08687cafaf14 100644
--- a/packages/svelte/elements.d.ts
+++ b/packages/svelte/elements.d.ts
@@ -957,6 +957,7 @@ export interface HTMLDelAttributes extends HTMLAttributes<HTMLModElement> {
 
 export interface HTMLDialogAttributes extends HTMLAttributes<HTMLDialogElement> {
 	open?: boolean | undefined | null;
+	closedby?: 'any' | 'closerequest' | 'none' | undefined | null;
 }
 
 export interface HTMLEmbedAttributes extends HTMLAttributes<HTMLEmbedElement> {
diff --git a/packages/svelte/package.json b/packages/svelte/package.json
index fb20167a4e73..53f03e3543fc 100644
--- a/packages/svelte/package.json
+++ b/packages/svelte/package.json
@@ -2,7 +2,7 @@
   "name": "svelte",
   "description": "Cybernetically enhanced web apps",
   "license": "MIT",
-  "version": "5.22.5",
+  "version": "5.22.6",
   "type": "module",
   "types": "./types/index.d.ts",
   "engines": {
diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/CallExpression.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/CallExpression.js
index 7a3057451aa1..fda43ad7911a 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/CallExpression.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/CallExpression.js
@@ -44,7 +44,8 @@ export function CallExpression(node, context) {
 		node.callee.property.type === 'Identifier' &&
 		['debug', 'dir', 'error', 'group', 'groupCollapsed', 'info', 'log', 'trace', 'warn'].includes(
 			node.callee.property.name
-		)
+		) &&
+		node.arguments.some((arg) => arg.type !== 'Literal') // TODO more cases?
 	) {
 		return b.call(
 			node.callee,
diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/events.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/events.js
index f23f7548ece1..2667a96f6aef 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/events.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/events.js
@@ -46,8 +46,12 @@ export function visit_event_attribute(node, context) {
 
 			// When we hoist a function we assign an array with the function and all
 			// hoisted closure params.
-			const args = [handler, ...hoisted_params];
-			delegated_assignment = b.array(args);
+			if (hoisted_params) {
+				const args = [handler, ...hoisted_params];
+				delegated_assignment = b.array(args);
+			} else {
+				delegated_assignment = handler;
+			}
 		} else {
 			delegated_assignment = handler;
 		}
@@ -123,11 +127,19 @@ export function build_event_handler(node, metadata, context) {
 	}
 
 	// function declared in the script
-	if (
-		handler.type === 'Identifier' &&
-		context.state.scope.get(handler.name)?.declaration_kind !== 'import'
-	) {
-		return handler;
+	if (handler.type === 'Identifier') {
+		const binding = context.state.scope.get(handler.name);
+
+		if (binding?.is_function()) {
+			return handler;
+		}
+
+		// local variable can be assigned directly
+		// except in dev mode where when need $.apply()
+		// in order to handle warnings.
+		if (!dev && binding?.declaration_kind !== 'import') {
+			return handler;
+		}
 	}
 
 	if (metadata.has_call) {
diff --git a/packages/svelte/src/compiler/phases/scope.js b/packages/svelte/src/compiler/phases/scope.js
index 7d9f90982afb..a5227c1b5113 100644
--- a/packages/svelte/src/compiler/phases/scope.js
+++ b/packages/svelte/src/compiler/phases/scope.js
@@ -79,6 +79,21 @@ export class Binding {
 	get updated() {
 		return this.mutated || this.reassigned;
 	}
+
+	is_function() {
+		if (this.reassigned) {
+			// even if it's reassigned to another function,
+			// we can't use it directly as e.g. an event handler
+			return false;
+		}
+
+		if (this.declaration_kind === 'function') {
+			return true;
+		}
+
+		const type = this.initial?.type;
+		return type === 'ArrowFunctionExpression' || type === 'FunctionExpression';
+	}
 }
 
 export class Scope {
diff --git a/packages/svelte/src/index-client.js b/packages/svelte/src/index-client.js
index efcf7b727b8d..fd8e999da763 100644
--- a/packages/svelte/src/index-client.js
+++ b/packages/svelte/src/index-client.js
@@ -45,13 +45,14 @@ if (DEV) {
 }
 
 /**
- * The `onMount` function schedules a callback to run as soon as the component has been mounted to the DOM.
- * It must be called during the component's initialisation (but doesn't need to live *inside* the component;
- * it can be called from an external module).
+ * `onMount`, like [`$effect`](https://svelte.dev/docs/svelte/$effect), schedules a function to run as soon as the component has been mounted to the DOM.
+ * Unlike `$effect`, the provided function only runs once.
  *
- * If a function is returned _synchronously_ from `onMount`, it will be called when the component is unmounted.
+ * It must be called during the component's initialisation (but doesn't need to live _inside_ the component;
+ * it can be called from an external module). If a function is returned _synchronously_ from `onMount`,
+ * it will be called when the component is unmounted.
  *
- * `onMount` does not run inside [server-side components](https://svelte.dev/docs/svelte/svelte-server#render).
+ * `onMount` functions do not run during [server-side rendering](https://svelte.dev/docs/svelte/svelte-server#render).
  *
  * @template T
  * @param {() => NotFunction<T> | Promise<NotFunction<T>> | (() => any)} fn
diff --git a/packages/svelte/src/internal/client/dom/elements/events.js b/packages/svelte/src/internal/client/dom/elements/events.js
index 25ece5f569d7..0c1bb1dada83 100644
--- a/packages/svelte/src/internal/client/dom/elements/events.js
+++ b/packages/svelte/src/internal/client/dom/elements/events.js
@@ -238,7 +238,7 @@ export function handle_event_propagation(event) {
 				var delegated = current_target['__' + event_name];
 
 				if (
-					delegated !== undefined &&
+					delegated != null &&
 					(!(/** @type {any} */ (current_target).disabled) ||
 						// DOM could've been updated already by the time this is reached, so we check this as well
 						// -> the target could not have been disabled because it emits the event in the first place
@@ -311,13 +311,11 @@ export function apply(
 		error = e;
 	}
 
-	if (typeof handler === 'function') {
-		handler.apply(element, args);
-	} else if (has_side_effects || handler != null || error) {
+	if (typeof handler !== 'function' && (has_side_effects || handler != null || error)) {
 		const filename = component?.[FILENAME];
 		const location = loc ? ` at ${filename}:${loc[0]}:${loc[1]}` : ` in ${filename}`;
-
-		const event_name = args[0].type;
+		const phase = args[0]?.eventPhase < Event.BUBBLING_PHASE ? 'capture' : '';
+		const event_name = args[0]?.type + phase;
 		const description = `\`${event_name}\` handler${location}`;
 		const suggestion = remove_parens ? 'remove the trailing `()`' : 'add a leading `() =>`';
 
@@ -327,4 +325,5 @@ export function apply(
 			throw error;
 		}
 	}
+	handler?.apply(element, args);
 }
diff --git a/packages/svelte/src/version.js b/packages/svelte/src/version.js
index e20a9683ddc6..01e1b390a39e 100644
--- a/packages/svelte/src/version.js
+++ b/packages/svelte/src/version.js
@@ -4,5 +4,5 @@
  * The current version, as set in package.json.
  * @type {string}
  */
-export const VERSION = '5.22.5';
+export const VERSION = '5.22.6';
 export const PUBLIC_VERSION = '5';
diff --git a/packages/svelte/tests/runtime-runes/samples/event-handler-invalid-values/_config.js b/packages/svelte/tests/runtime-runes/samples/event-handler-invalid-values/_config.js
new file mode 100644
index 000000000000..d53812d4c39e
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/event-handler-invalid-values/_config.js
@@ -0,0 +1,48 @@
+import { assertType } from 'vitest';
+import { test } from '../../test';
+
+export default test({
+	mode: ['client'],
+
+	compileOptions: {
+		dev: true
+	},
+
+	test({ assert, target, warnings, logs }) {
+		/** @type {any} */
+		let error = null;
+
+		const handler = (/** @type {any} */ e) => {
+			error = e.error;
+			e.stopImmediatePropagation();
+		};
+
+		window.addEventListener('error', handler, true);
+
+		const [b1, b2, b3] = target.querySelectorAll('button');
+
+		b1.click();
+		assert.deepEqual(logs, []);
+		assert.equal(error, null);
+
+		error = null;
+		logs.length = 0;
+
+		b2.click();
+		assert.deepEqual(logs, ['clicked']);
+		assert.equal(error, null);
+
+		error = null;
+		logs.length = 0;
+
+		b3.click();
+		assert.deepEqual(logs, []);
+		assert.deepEqual(warnings, [
+			'`click` handler at main.svelte:10:17 should be a function. Did you mean to add a leading `() =>`?'
+		]);
+		assert.isNotNull(error);
+		assert.match(error.message, /is not a function/);
+
+		window.removeEventListener('error', handler, true);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/event-handler-invalid-values/main.svelte b/packages/svelte/tests/runtime-runes/samples/event-handler-invalid-values/main.svelte
new file mode 100644
index 000000000000..f6e344ece8cf
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/event-handler-invalid-values/main.svelte
@@ -0,0 +1,10 @@
+<script>
+	let ignore = null;
+	let handler = () => console.log("clicked");
+	let bad = "invalid";
+	
+</script>
+
+<button onclick={ignore}>click</button>
+<button onclick={handler}>click</button>
+<button onclick={bad}>click</button>
diff --git a/packages/svelte/types/index.d.ts b/packages/svelte/types/index.d.ts
index c3dbdcac791e..c6000fc4b67f 100644
--- a/packages/svelte/types/index.d.ts
+++ b/packages/svelte/types/index.d.ts
@@ -349,13 +349,14 @@ declare module 'svelte' {
 				props: Props;
 			});
 	/**
-	 * The `onMount` function schedules a callback to run as soon as the component has been mounted to the DOM.
-	 * It must be called during the component's initialisation (but doesn't need to live *inside* the component;
-	 * it can be called from an external module).
+	 * `onMount`, like [`$effect`](https://svelte.dev/docs/svelte/$effect), schedules a function to run as soon as the component has been mounted to the DOM.
+	 * Unlike `$effect`, the provided function only runs once.
 	 *
-	 * If a function is returned _synchronously_ from `onMount`, it will be called when the component is unmounted.
+	 * It must be called during the component's initialisation (but doesn't need to live _inside_ the component;
+	 * it can be called from an external module). If a function is returned _synchronously_ from `onMount`,
+	 * it will be called when the component is unmounted.
 	 *
-	 * `onMount` does not run inside [server-side components](https://svelte.dev/docs/svelte/svelte-server#render).
+	 * `onMount` functions do not run during [server-side rendering](https://svelte.dev/docs/svelte/svelte-server#render).
 	 *
 	 * */
 	export function onMount<T>(fn: () => NotFunction<T> | Promise<NotFunction<T>> | (() => any)): void;

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