diff --git a/.changeset/gorgeous-gorillas-fix.md b/.changeset/gorgeous-gorillas-fix.md
new file mode 100644
index 000000000000..65e08e10d5cb
--- /dev/null
+++ b/.changeset/gorgeous-gorillas-fix.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+Update for TS7
diff --git a/packages/svelte/scripts/generate-types.js b/packages/svelte/scripts/generate-types.js
index c558a2bbf78a..0ee6004d4a2c 100644
--- a/packages/svelte/scripts/generate-types.js
+++ b/packages/svelte/scripts/generate-types.js
@@ -26,9 +26,11 @@ await createBundle({
 		// so that types/properties with `@internal` (and its dependencies) are removed from the output
 		stripInternal: true,
 		paths: Object.fromEntries(
-			Object.entries(pkg.imports).map(([key, value]) => {
-				return [key, [value.types ?? value.default ?? value]];
-			})
+			Object.entries(pkg.imports).map(
+				/** @param {[string,any]} import */ ([key, value]) => {
+					return [key, [value.types ?? value.default ?? value]];
+				}
+			)
 		)
 	},
 	modules: {
diff --git a/packages/svelte/src/compiler/legacy.js b/packages/svelte/src/compiler/legacy.js
index 85345bca4a22..b1bbcfcf741a 100644
--- a/packages/svelte/src/compiler/legacy.js
+++ b/packages/svelte/src/compiler/legacy.js
@@ -55,7 +55,9 @@ export function convert(source, ast) {
 
 				// Insert svelte:options back into the root nodes
 				if (/** @type {any} */ (options)?.__raw__) {
-					let idx = node.fragment.nodes.findIndex((node) => options.end <= node.start);
+					let idx = node.fragment.nodes.findIndex(
+						(node) => /** @type {any} */ (options).end <= node.start
+					);
 					if (idx === -1) {
 						idx = node.fragment.nodes.length;
 					}
diff --git a/packages/svelte/src/compiler/phases/2-analyze/css/css-prune.js b/packages/svelte/src/compiler/phases/2-analyze/css/css-prune.js
index 79e8fbb02c08..8a4d8cb35056 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/css/css-prune.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/css/css-prune.js
@@ -9,8 +9,8 @@ import {
 import { regex_ends_with_whitespace, regex_starts_with_whitespace } from '../../patterns.js';
 import { get_attribute_chunks, is_text_attribute } from '../../../utils/ast.js';
 
-/** @typedef {NODE_PROBABLY_EXISTS | NODE_DEFINITELY_EXISTS} NodeExistsValue */
-/** @typedef {FORWARD | BACKWARD} Direction */
+/** @typedef {typeof NODE_PROBABLY_EXISTS | typeof NODE_DEFINITELY_EXISTS} NodeExistsValue */
+/** @typedef {typeof FORWARD | typeof BACKWARD} Direction */
 
 const NODE_PROBABLY_EXISTS = 0;
 const NODE_DEFINITELY_EXISTS = 1;
diff --git a/packages/svelte/src/compiler/phases/2-analyze/index.js b/packages/svelte/src/compiler/phases/2-analyze/index.js
index d407b4455639..f10a8b4a5e74 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/index.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/index.js
@@ -295,7 +295,7 @@ export function analyze_module(source, options) {
 			// TODO the following are not needed for modules, but we have to pass them in order to avoid type error,
 			// and reducing the type would result in a lot of tedious type casts elsewhere - find a good solution one day
 			ast_type: /** @type {any} */ (null),
-			component_slots: new Set(),
+			component_slots: /** @type {Set<string>} */ (new Set()),
 			expression: null,
 			function_depth: 0,
 			has_props_rune: false,
diff --git a/packages/svelte/src/compiler/phases/2-analyze/utils/check_graph_for_cycles.js b/packages/svelte/src/compiler/phases/2-analyze/utils/check_graph_for_cycles.js
index 67201d482507..83959248fec2 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/utils/check_graph_for_cycles.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/utils/check_graph_for_cycles.js
@@ -14,6 +14,7 @@ export default function check_graph_for_cycles(edges) {
 	}, new Map());
 
 	const visited = new Set();
+	/** @type {Set<T>} */
 	const on_stack = new Set();
 	/** @type {Array<Array<T>>} */
 	const cycles = [];
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y/index.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y/index.js
index f45a6c9a80d6..e2f84290e567 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y/index.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y/index.js
@@ -599,7 +599,7 @@ function has_disabled_attribute(attribute_map) {
 /**
  * @param {string} tag_name
  * @param {Map<string, AST.Attribute>} attribute_map
- * @returns {ElementInteractivity[keyof ElementInteractivity]}
+ * @returns {typeof ElementInteractivity[keyof typeof ElementInteractivity]}
  */
 function element_interactivity(tag_name, attribute_map) {
 	if (
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/component.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/component.js
index aca87fab811c..6d09398fb7eb 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/component.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/component.js
@@ -145,6 +145,7 @@ export function visit_component(node, context) {
 		if (slot_name !== 'default') comments = [];
 	}
 
+	/** @type {Set<string>} */
 	const component_slots = new Set();
 
 	for (const slot_name in nodes) {
diff --git a/packages/svelte/src/compiler/phases/scope.js b/packages/svelte/src/compiler/phases/scope.js
index 700e098e4511..7fd2b6539907 100644
--- a/packages/svelte/src/compiler/phases/scope.js
+++ b/packages/svelte/src/compiler/phases/scope.js
@@ -22,7 +22,7 @@ const NUMBER = Symbol('number');
 const STRING = Symbol('string');
 const FUNCTION = Symbol('string');
 
-/** @type {Record<string, [type: NUMBER | STRING | UNKNOWN, fn?: Function]>} */
+/** @type {Record<string, [type: typeof NUMBER | typeof  STRING | typeof  UNKNOWN, fn?: Function]>} */
 const globals = {
 	BigInt: [NUMBER],
 	'Math.min': [NUMBER, Math.min],
diff --git a/packages/svelte/src/compiler/state.js b/packages/svelte/src/compiler/state.js
index 725d03b802de..6d9873eb301e 100644
--- a/packages/svelte/src/compiler/state.js
+++ b/packages/svelte/src/compiler/state.js
@@ -87,7 +87,7 @@ export function pop_ignore() {
 
 /**
  * @param {AST.SvelteNode | NodeLike} node
- * @param {import('../constants.js').IGNORABLE_RUNTIME_WARNINGS[number]} code
+ * @param {typeof import('../constants.js').IGNORABLE_RUNTIME_WARNINGS[number]} code
  * @returns
  */
 export function is_ignored(node, code) {
diff --git a/packages/svelte/src/index-client.js b/packages/svelte/src/index-client.js
index 397a81c31978..85eeab7de989 100644
--- a/packages/svelte/src/index-client.js
+++ b/packages/svelte/src/index-client.js
@@ -160,10 +160,14 @@ export function createEventDispatcher() {
 		e.lifecycle_outside_component('createEventDispatcher');
 	}
 
+	/**
+	 * @param [detail]
+	 * @param [options]
+	 */
 	return (type, detail, options) => {
 		const events = /** @type {Record<string, Function | Function[]>} */ (
 			active_component_context.s.$$events
-		)?.[/** @type {any} */ (type)];
+		)?.[/** @type {string} */ (type)];
 
 		if (events) {
 			const callbacks = is_array(events) ? events.slice() : [events];
diff --git a/packages/svelte/src/internal/client/dev/hmr.js b/packages/svelte/src/internal/client/dev/hmr.js
index 27e2643d1674..709a1b272220 100644
--- a/packages/svelte/src/internal/client/dev/hmr.js
+++ b/packages/svelte/src/internal/client/dev/hmr.js
@@ -64,7 +64,7 @@ export function hmr(original, get_source) {
 	// @ts-expect-error
 	wrapper[FILENAME] = original[FILENAME];
 
-	// @ts-expect-error
+	// @ts-ignore
 	wrapper[HMR] = {
 		// When we accept an update, we set the original source to the new component
 		original,
diff --git a/packages/svelte/src/internal/client/dom/blocks/await.js b/packages/svelte/src/internal/client/dom/blocks/await.js
index 4f68db57b1bb..42df41041ecd 100644
--- a/packages/svelte/src/internal/client/dom/blocks/await.js
+++ b/packages/svelte/src/internal/client/dom/blocks/await.js
@@ -28,6 +28,8 @@ const PENDING = 0;
 const THEN = 1;
 const CATCH = 2;
 
+/** @typedef {typeof PENDING | typeof THEN | typeof CATCH} AwaitState */
+
 /**
  * @template V
  * @param {TemplateNode} node
@@ -67,9 +69,8 @@ export function await_block(node, get_input, pending_fn, then_fn, catch_fn) {
 		: mutable_source(/** @type {V} */ (undefined), false, false);
 	var error_source = runes ? source(undefined) : mutable_source(undefined, false, false);
 	var resolved = false;
-
 	/**
-	 * @param {PENDING | THEN | CATCH} state
+	 * @param {AwaitState} state
 	 * @param {boolean} restore
 	 */
 	function update(state, restore) {
diff --git a/packages/svelte/src/internal/client/dom/blocks/each.js b/packages/svelte/src/internal/client/dom/blocks/each.js
index 43c75e2a3769..006bf09257d1 100644
--- a/packages/svelte/src/internal/client/dom/blocks/each.js
+++ b/packages/svelte/src/internal/client/dom/blocks/each.js
@@ -191,7 +191,7 @@ export function each(node, flags, get_collection, get_key, render_fn, fallback_f
 		// store a reference to the effect so that we can update the start/end nodes in reconciliation
 		each_effect ??= /** @type {Effect} */ (active_effect);
 
-		array = get(each_array);
+		array = /** @type {V[]} */ (get(each_array));
 		var length = array.length;
 
 		if (was_empty && length === 0) {
diff --git a/packages/svelte/src/internal/client/dom/blocks/if.js b/packages/svelte/src/internal/client/dom/blocks/if.js
index 6ba9ad4936f1..f418d465388e 100644
--- a/packages/svelte/src/internal/client/dom/blocks/if.js
+++ b/packages/svelte/src/internal/client/dom/blocks/if.js
@@ -36,7 +36,7 @@ export function if_block(node, fn, elseif = false) {
 	/** @type {Effect | null} */
 	var alternate_effect = null;
 
-	/** @type {UNINITIALIZED | boolean | null} */
+	/** @type {typeof UNINITIALIZED | boolean | null} */
 	var condition = UNINITIALIZED;
 
 	var flags = elseif ? EFFECT_TRANSPARENT : 0;
diff --git a/packages/svelte/src/internal/client/dom/elements/bindings/input.js b/packages/svelte/src/internal/client/dom/elements/bindings/input.js
index 7c1fccea0fbc..29ba0e4d4bd3 100644
--- a/packages/svelte/src/internal/client/dom/elements/bindings/input.js
+++ b/packages/svelte/src/internal/client/dom/elements/bindings/input.js
@@ -240,6 +240,7 @@ export function bind_checked(input, get, set = get) {
  * @returns {V[]}
  */
 function get_binding_group_value(group, __value, checked) {
+	/** @type {Set<V>} */
 	var value = new Set();
 
 	for (var i = 0; i < group.length; i += 1) {
diff --git a/packages/svelte/src/internal/client/dom/template.js b/packages/svelte/src/internal/client/dom/template.js
index ebbf0039b269..265a52262f4b 100644
--- a/packages/svelte/src/internal/client/dom/template.js
+++ b/packages/svelte/src/internal/client/dom/template.js
@@ -156,7 +156,7 @@ export function from_mathml(content, flags) {
 
 /**
  * @param {TemplateStructure[]} structure
- * @param {NAMESPACE_SVG | NAMESPACE_MATHML | undefined} [ns]
+ * @param {typeof NAMESPACE_SVG | typeof NAMESPACE_MATHML | undefined} [ns]
  */
 function fragment_from_tree(structure, ns) {
 	var fragment = create_fragment();
diff --git a/packages/svelte/src/internal/client/reactivity/equality.js b/packages/svelte/src/internal/client/reactivity/equality.js
index 104123857366..76a4f8a34cd2 100644
--- a/packages/svelte/src/internal/client/reactivity/equality.js
+++ b/packages/svelte/src/internal/client/reactivity/equality.js
@@ -1,9 +1,9 @@
 /** @import { Equals } from '#client' */
 
 /** @type {Equals} */
-export function equals(value) {
+export const equals = function (value) {
 	return value === this.v;
-}
+};
 
 /**
  * @param {unknown} a
@@ -26,6 +26,6 @@ export function not_equal(a, b) {
 }
 
 /** @type {Equals} */
-export function safe_equals(value) {
+export const safe_equals = function (value) {
 	return !safe_not_equal(value, this.v);
-}
+};
diff --git a/packages/svelte/src/internal/client/reactivity/props.js b/packages/svelte/src/internal/client/reactivity/props.js
index 05b747a1c4a5..8353eb39e2f5 100644
--- a/packages/svelte/src/internal/client/reactivity/props.js
+++ b/packages/svelte/src/internal/client/reactivity/props.js
@@ -184,8 +184,7 @@ export function legacy_rest_props(props, exclude) {
  * The proxy handler for spread props. Handles the incoming array of props
  * that looks like `() => { dynamic: props }, { static: prop }, ..` and wraps
  * them so that the whole thing is passed to the component as the `$$props` argument.
- * @template {Record<string | symbol, unknown>} T
- * @type {ProxyHandler<{ props: Array<T | (() => T)> }>}}
+ * @type {ProxyHandler<{ props: Array<Record<string | symbol, unknown> | (() => Record<string | symbol, unknown>)> }>}}
  */
 const spread_props_handler = {
 	get(target, key) {
@@ -362,22 +361,23 @@ export function prop(props, key, flags, fallback) {
 	// means we can just call `$$props.foo = value` directly
 	if (setter) {
 		var legacy_parent = props.$$legacy;
-
-		return function (/** @type {any} */ value, /** @type {boolean} */ mutation) {
-			if (arguments.length > 0) {
-				// We don't want to notify if the value was mutated and the parent is in runes mode.
-				// In that case the state proxy (if it exists) should take care of the notification.
-				// If the parent is not in runes mode, we need to notify on mutation, too, that the prop
-				// has changed because the parent will not be able to detect the change otherwise.
-				if (!runes || !mutation || legacy_parent || is_store_sub) {
-					/** @type {Function} */ (setter)(mutation ? getter() : value);
+		return /** @type {() => V} */ (
+			function (/** @type {V} */ value, /** @type {boolean} */ mutation) {
+				if (arguments.length > 0) {
+					// We don't want to notify if the value was mutated and the parent is in runes mode.
+					// In that case the state proxy (if it exists) should take care of the notification.
+					// If the parent is not in runes mode, we need to notify on mutation, too, that the prop
+					// has changed because the parent will not be able to detect the change otherwise.
+					if (!runes || !mutation || legacy_parent || is_store_sub) {
+						/** @type {Function} */ (setter)(mutation ? getter() : value);
+					}
+
+					return value;
 				}
 
-				return value;
+				return getter();
 			}
-
-			return getter();
-		};
+		);
 	}
 
 	// Either prop is written to, but there's no binding, which means we
@@ -400,29 +400,31 @@ export function prop(props, key, flags, fallback) {
 
 	var parent_effect = /** @type {Effect} */ (active_effect);
 
-	return function (/** @type {any} */ value, /** @type {boolean} */ mutation) {
-		if (arguments.length > 0) {
-			const new_value = mutation ? get(d) : runes && bindable ? proxy(value) : value;
+	return /** @type {() => V} */ (
+		function (/** @type {any} */ value, /** @type {boolean} */ mutation) {
+			if (arguments.length > 0) {
+				const new_value = mutation ? get(d) : runes && bindable ? proxy(value) : value;
+
+				set(d, new_value);
+				overridden = true;
 
-			set(d, new_value);
-			overridden = true;
+				if (fallback_value !== undefined) {
+					fallback_value = new_value;
+				}
 
-			if (fallback_value !== undefined) {
-				fallback_value = new_value;
+				return value;
 			}
 
-			return value;
-		}
+			// special case — avoid recalculating the derived if we're in a
+			// teardown function and the prop was overridden locally, or the
+			// component was already destroyed (this latter part is necessary
+			// because `bind:this` can read props after the component has
+			// been destroyed. TODO simplify `bind:this`
+			if ((is_destroying_effect && overridden) || (parent_effect.f & DESTROYED) !== 0) {
+				return d.v;
+			}
 
-		// special case — avoid recalculating the derived if we're in a
-		// teardown function and the prop was overridden locally, or the
-		// component was already destroyed (this latter part is necessary
-		// because `bind:this` can read props after the component has
-		// been destroyed. TODO simplify `bind:this`
-		if ((is_destroying_effect && overridden) || (parent_effect.f & DESTROYED) !== 0) {
-			return d.v;
+			return get(d);
 		}
-
-		return get(d);
-	};
+	);
 }
diff --git a/packages/svelte/src/internal/client/reactivity/sources.js b/packages/svelte/src/internal/client/reactivity/sources.js
index f6b14f3360de..9bb0ec368f90 100644
--- a/packages/svelte/src/internal/client/reactivity/sources.js
+++ b/packages/svelte/src/internal/client/reactivity/sources.js
@@ -37,6 +37,7 @@ import { Batch, schedule_effect } from './batch.js';
 import { proxy } from '../proxy.js';
 import { execute_derived } from './deriveds.js';
 
+/** @type {Set<any>} */
 export let inspect_effects = new Set();
 
 /** @type {Map<Source, any>} */
diff --git a/packages/svelte/src/internal/client/render.js b/packages/svelte/src/internal/client/render.js
index ff6844453dcc..8cb2b72c81eb 100644
--- a/packages/svelte/src/internal/client/render.js
+++ b/packages/svelte/src/internal/client/render.js
@@ -169,6 +169,7 @@ const document_listeners = new Map();
 function _mount(Component, { target, anchor, props = {}, events, context, intro = true }) {
 	init_operations();
 
+	/** @type {Set<string>} */
 	var registered_events = new Set();
 
 	/** @param {Array<string>} events */
diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index e86866af2a14..3d760e4b9ef7 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -284,7 +284,8 @@ export function update_reaction(reaction) {
 
 	try {
 		reaction.f |= REACTION_IS_UPDATING;
-		var result = /** @type {Function} */ (0, reaction.fn)();
+		var fn = /** @type {Function} */ (reaction.fn);
+		var result = fn();
 		var deps = reaction.deps;
 
 		if (new_deps !== null) {
diff --git a/packages/svelte/src/internal/server/payload.js b/packages/svelte/src/internal/server/payload.js
index 195488e06127..a7e40ad1db36 100644
--- a/packages/svelte/src/internal/server/payload.js
+++ b/packages/svelte/src/internal/server/payload.js
@@ -6,7 +6,12 @@ export class HeadPayload {
 	uid = () => '';
 	title = '';
 
-	constructor(css = new Set(), /** @type {string[]} */ out = [], title = '', uid = () => '') {
+	constructor(
+		/** @type {Set<{ hash: string; code: string }>} */ css = new Set(),
+		/** @type {string[]} */ out = [],
+		title = '',
+		uid = () => ''
+	) {
 		this.css = css;
 		this.out = out;
 		this.title = title;
diff --git a/packages/svelte/src/internal/shared/validate.js b/packages/svelte/src/internal/shared/validate.js
index 8f3e2807e714..48e76f09589d 100644
--- a/packages/svelte/src/internal/shared/validate.js
+++ b/packages/svelte/src/internal/shared/validate.js
@@ -35,7 +35,7 @@ export function validate_store(store, name) {
 }
 
 /**
- * @template {() => unknown} T
+ * @template {(...args: any[]) => unknown} T
  * @param {T} fn
  */
 export function prevent_snippet_stringification(fn) {
diff --git a/packages/svelte/src/utils.js b/packages/svelte/src/utils.js
index cd79cfc27467..f8c39253aca1 100644
--- a/packages/svelte/src/utils.js
+++ b/packages/svelte/src/utils.js
@@ -452,7 +452,7 @@ const RUNES = /** @type {const} */ ([
 	'$host'
 ]);
 
-/** @typedef {RUNES[number]} RuneName */
+/** @typedef {typeof RUNES[number]} RuneName */
 
 /**
  * @param {string} name
@@ -462,7 +462,7 @@ export function is_rune(name) {
 	return RUNES.includes(/** @type {RuneName} */ (name));
 }
 
-/** @typedef {STATE_CREATION_RUNES[number]} StateCreationRuneName */
+/** @typedef {typeof STATE_CREATION_RUNES[number]} StateCreationRuneName */
 
 /**
  * @param {string} name
@@ -477,7 +477,7 @@ const RAW_TEXT_ELEMENTS = /** @type {const} */ (['textarea', 'script', 'style',
 
 /** @param {string} name */
 export function is_raw_text_element(name) {
-	return RAW_TEXT_ELEMENTS.includes(/** @type {RAW_TEXT_ELEMENTS[number]} */ (name));
+	return RAW_TEXT_ELEMENTS.includes(/** @type {typeof RAW_TEXT_ELEMENTS[number]} */ (name));
 }
 
 /**
diff --git a/packages/svelte/tests/animation-helpers.js b/packages/svelte/tests/animation-helpers.js
index dcbb06292305..0452a0d64346 100644
--- a/packages/svelte/tests/animation-helpers.js
+++ b/packages/svelte/tests/animation-helpers.js
@@ -3,7 +3,9 @@ import { raf as svelte_raf } from 'svelte/internal/client';
 import { queue_micro_task } from '../src/internal/client/dom/task.js';
 
 export const raf = {
+	/** @type {Set<Animation>} */
 	animations: new Set(),
+	/** @type {Set<(n: number) => void>} */
 	ticks: new Set(),
 	tick,
 	time: 0,
@@ -54,14 +56,24 @@ class Animation {
 
 	/**
 	 * @param {HTMLElement} target
-	 * @param {Keyframe[]} keyframes
-	 * @param {{ duration: number, delay: number }} options
+	 * @param {Keyframe[] | PropertyIndexedKeyframes | null} keyframes
+	 * @param {number | KeyframeAnimationOptions | undefined} options
 	 */
-	constructor(target, keyframes, { duration, delay }) {
+	constructor(target, keyframes, options) {
 		this.target = target;
-		this.#keyframes = keyframes;
-		this.#duration = Math.round(duration);
-		this.#delay = delay ?? 0;
+		this.#keyframes = Array.isArray(keyframes) ? keyframes : [];
+		if (typeof options === 'number') {
+			this.#duration = options;
+			this.#delay = 0;
+		} else {
+			const { duration = 0, delay = 0 } = options ?? {};
+			if (typeof duration === 'object') {
+				this.#duration = 0;
+			} else {
+				this.#duration = Math.round(+duration);
+			}
+			this.#delay = delay;
+		}
 
 		this._update();
 	}
@@ -189,6 +201,7 @@ function interpolate(a, b, p) {
  * @param {{duration: number, delay: number}} options
  * @returns {globalThis.Animation}
  */
+// @ts-ignore
 HTMLElement.prototype.animate = function (keyframes, options) {
 	const animation = new Animation(this, keyframes, options);
 	raf.animations.add(animation);
@@ -196,6 +209,7 @@ HTMLElement.prototype.animate = function (keyframes, options) {
 	return animation;
 };
 
+// @ts-ignore
 HTMLElement.prototype.getAnimations = function () {
 	return Array.from(raf.animations).filter((animation) => animation.target === this);
 };
diff --git a/packages/svelte/tests/helpers.js b/packages/svelte/tests/helpers.js
index 410838829e3a..7a9640636c40 100644
--- a/packages/svelte/tests/helpers.js
+++ b/packages/svelte/tests/helpers.js
@@ -43,6 +43,7 @@ export function create_deferred() {
 	/** @param {any} [reason] */
 	let reject = (reason) => {};
 
+	/** @type {Promise<any>} */
 	const promise = new Promise((f, r) => {
 		resolve = f;
 		reject = r;
diff --git a/packages/svelte/tests/runtime-browser/assert.js b/packages/svelte/tests/runtime-browser/assert.js
index 48bde014105c..9a294a48c7f0 100644
--- a/packages/svelte/tests/runtime-browser/assert.js
+++ b/packages/svelte/tests/runtime-browser/assert.js
@@ -87,15 +87,17 @@ function normalize_html(window, html) {
 /** @param {any} node */
 function normalize_children(node) {
 	// sort attributes
-	const attributes = Array.from(node.attributes).sort((a, b) => {
-		return a.name < b.name ? -1 : 1;
-	});
+	const attributes = Array.from(node.attributes).sort(
+		(/** @type {any} */ a, /** @type {any} */ b) => {
+			return a.name < b.name ? -1 : 1;
+		}
+	);
 
-	attributes.forEach((attr) => {
+	attributes.forEach((/** @type{any} */ attr) => {
 		node.removeAttribute(attr.name);
 	});
 
-	attributes.forEach((attr) => {
+	attributes.forEach((/** @type{any} */ attr) => {
 		node.setAttribute(attr.name, attr.value);
 	});