diff --git a/packages/svelte/src/internal/client/reactivity/deriveds.js b/packages/svelte/src/internal/client/reactivity/deriveds.js
index fe29bc40594e..ef59b4b94041 100644
--- a/packages/svelte/src/internal/client/reactivity/deriveds.js
+++ b/packages/svelte/src/internal/client/reactivity/deriveds.js
@@ -11,25 +11,27 @@ import { default_equals, safe_equal } from './equality.js';
  */
 /*#__NO_SIDE_EFFECTS__*/
 export function derived(fn) {
-	const is_unowned = current_effect === null;
-	const flags = is_unowned ? DERIVED | UNOWNED : DERIVED;
-	const signal = /** @type {import('../types.js').Derived<V>} */ ({
+	let flags = DERIVED | CLEAN;
+	if (current_effect === null) flags |= UNOWNED;
+
+	/** @type {import('#client').Derived<V>} */
+	const signal = {
 		b: current_block,
 		c: null,
 		d: null,
 		e: default_equals,
-		f: flags | CLEAN,
+		f: flags,
 		i: fn,
 		r: null,
+		// @ts-expect-error
 		v: UNINITIALIZED,
 		w: 0,
 		x: null,
 		y: null
-	});
+	};
 
 	if (DEV) {
-		// @ts-expect-error
-		signal.inspect = new Set();
+		/** @type {import('#client').DerivedDebug} */ (signal).inspect = new Set();
 	}
 
 	if (current_consumer !== null) {
@@ -42,7 +44,7 @@ export function derived(fn) {
 /**
  * @template V
  * @param {() => V} fn
- * @returns {import('../types.js').Derived<V>}
+ * @returns {import('#client').Derived<V>}
  */
 /*#__NO_SIDE_EFFECTS__*/
 export function derived_safe_equal(fn) {
diff --git a/packages/svelte/src/internal/client/reactivity/effects.js b/packages/svelte/src/internal/client/reactivity/effects.js
index 2570f60bec09..8ca43f841450 100644
--- a/packages/svelte/src/internal/client/reactivity/effects.js
+++ b/packages/svelte/src/internal/client/reactivity/effects.js
@@ -10,8 +10,8 @@ import {
 import { DIRTY, MANAGED, RENDER_EFFECT, EFFECT, PRE_EFFECT } from '../constants.js';
 
 /**
- * @param {import('../types.js').Reaction} target_signal
- * @param {import('../types.js').Reaction} ref_signal
+ * @param {import('#client').Reaction} target_signal
+ * @param {import('#client').Reaction} ref_signal
  * @returns {void}
  */
 export function push_reference(target_signal, ref_signal) {
@@ -24,14 +24,14 @@ export function push_reference(target_signal, ref_signal) {
 }
 
 /**
- * @param {import('../types.js').EffectType} type
- * @param {(() => void | (() => void)) | ((b: import('../types.js').Block) => void | (() => void))} fn
+ * @param {import('./types.js').EffectType} type
+ * @param {(() => void | (() => void)) | ((b: import('#client').Block) => void | (() => void))} fn
  * @param {boolean} sync
- * @param {null | import('../types.js').Block} block
+ * @param {null | import('#client').Block} block
  * @param {boolean} schedule
- * @returns {import('../types.js').Effect}
+ * @returns {import('#client').Effect}
  */
-function internal_create_effect(type, fn, sync, block, schedule) {
+function create_effect(type, fn, sync, block, schedule) {
 	/** @type {import('#client').Effect} */
 	const signal = {
 		b: block,
@@ -54,13 +54,16 @@ function internal_create_effect(type, fn, sync, block, schedule) {
 			push_reference(current_effect, signal);
 		}
 	}
+
 	if (schedule) {
 		schedule_effect(signal, sync);
 	}
+
 	return signal;
 }
 
 /**
+ * Internal representation of `$effect.active()`
  * @returns {boolean}
  */
 export function effect_active() {
@@ -70,7 +73,7 @@ export function effect_active() {
 /**
  * Internal representation of `$effect(...)`
  * @param {() => void | (() => void)} fn
- * @returns {import('../types.js').Effect}
+ * @returns {import('#client').Effect}
  */
 export function user_effect(fn) {
 	if (current_effect === null) {
@@ -85,7 +88,7 @@ export function user_effect(fn) {
 		current_component_context !== null &&
 		!current_component_context.m;
 
-	const effect = internal_create_effect(
+	const effect = create_effect(
 		EFFECT,
 		fn,
 		false,
@@ -94,9 +97,7 @@ export function user_effect(fn) {
 	);
 
 	if (apply_component_effect_heuristics) {
-		const context = /** @type {import('../types.js').ComponentContext} */ (
-			current_component_context
-		);
+		const context = /** @type {import('#client').ComponentContext} */ (current_component_context);
 		(context.e ??= []).push(effect);
 	}
 
@@ -117,33 +118,33 @@ export function user_root_effect(fn) {
 
 /**
  * @param {() => void | (() => void)} fn
- * @returns {import('../types.js').Effect}
+ * @returns {import('#client').Effect}
  */
 export function effect(fn) {
-	return internal_create_effect(EFFECT, fn, false, current_block, true);
+	return create_effect(EFFECT, fn, false, current_block, true);
 }
 
 /**
  * @param {() => void | (() => void)} fn
- * @returns {import('../types.js').Effect}
+ * @returns {import('#client').Effect}
  */
 export function managed_effect(fn) {
-	return internal_create_effect(EFFECT | MANAGED, fn, false, current_block, true);
+	return create_effect(EFFECT | MANAGED, fn, false, current_block, true);
 }
 
 /**
  * @param {() => void | (() => void)} fn
  * @param {boolean} sync
- * @returns {import('../types.js').Effect}
+ * @returns {import('#client').Effect}
  */
 export function managed_pre_effect(fn, sync) {
-	return internal_create_effect(PRE_EFFECT | MANAGED, fn, sync, current_block, true);
+	return create_effect(PRE_EFFECT | MANAGED, fn, sync, current_block, true);
 }
 
 /**
  * Internal representation of `$effect.pre(...)`
  * @param {() => void | (() => void)} fn
- * @returns {import('../types.js').Effect}
+ * @returns {import('#client').Effect}
  */
 export function pre_effect(fn) {
 	if (current_effect === null) {
@@ -155,7 +156,7 @@ export function pre_effect(fn) {
 		);
 	}
 	const sync = current_effect !== null && (current_effect.f & RENDER_EFFECT) !== 0;
-	return internal_create_effect(
+	return create_effect(
 		PRE_EFFECT,
 		() => {
 			const val = fn();
@@ -173,24 +174,24 @@ export function pre_effect(fn) {
  * bindings which are in later effects. However, we don't use a pre_effect directly as we don't want to flush anything.
  *
  * @param {() => void | (() => void)} fn
- * @returns {import('../types.js').Effect}
+ * @returns {import('#client').Effect}
  */
 export function invalidate_effect(fn) {
-	return internal_create_effect(PRE_EFFECT, fn, true, current_block, true);
+	return create_effect(PRE_EFFECT, fn, true, current_block, true);
 }
 
 /**
- * @template {import('../types.js').Block} B
+ * @template {import('#client').Block} B
  * @param {(block: B) => void | (() => void)} fn
  * @param {any} block
  * @param {any} managed
  * @param {any} sync
- * @returns {import('../types.js').Effect}
+ * @returns {import('#client').Effect}
  */
 export function render_effect(fn, block = current_block, managed = false, sync = true) {
 	let flags = RENDER_EFFECT;
 	if (managed) {
 		flags |= MANAGED;
 	}
-	return internal_create_effect(flags, /** @type {any} */ (fn), sync, block, true);
+	return create_effect(flags, /** @type {any} */ (fn), sync, block, true);
 }
diff --git a/packages/svelte/src/internal/client/reactivity/sources.js b/packages/svelte/src/internal/client/reactivity/sources.js
index 73174f208f3e..60403ddc3d47 100644
--- a/packages/svelte/src/internal/client/reactivity/sources.js
+++ b/packages/svelte/src/internal/client/reactivity/sources.js
@@ -23,31 +23,31 @@ import { CLEAN, DERIVED, DIRTY, MANAGED, SOURCE } from '../constants.js';
 
 /**
  * @template V
- * @param {V} initial_value
- * @returns {import('../types.js').Source<V>}
+ * @param {V} value
+ * @returns {import('#client').Source<V>}
  */
 /*#__NO_SIDE_EFFECTS__*/
-export function source(initial_value) {
+export function source(value) {
 	/** @type {import('#client').Source<V>} */
-	const signal = {
+	const source = {
 		c: null,
 		e: default_equals,
 		f: SOURCE | CLEAN,
-		v: initial_value,
+		v: value,
 		w: 0
 	};
 
 	if (DEV) {
-		/** @type {import('#client').SourceDebug} */ (signal).inspect = new Set();
+		/** @type {import('#client').SourceDebug<V>} */ (source).inspect = new Set();
 	}
 
-	return signal;
+	return source;
 }
 
 /**
  * @template V
  * @param {V} initial_value
- * @returns {import('../types.js').Source<V>}
+ * @returns {import('#client').Source<V>}
  */
 /*#__NO_SIDE_EFFECTS__*/
 export function mutable_source(initial_value) {
@@ -65,7 +65,7 @@ export function mutable_source(initial_value) {
 
 /**
  * @template V
- * @param {import('./types.js').Source<V>} signal
+ * @param {import('#client').Source<V>} signal
  * @param {V} value
  * @returns {void}
  */
@@ -75,7 +75,7 @@ export function set_sync(signal, value) {
 
 /**
  * @template V
- * @param {import('./types.js').Value<V>} source
+ * @param {import('#client').Value<V>} source
  * @param {V} value
  */
 export function mutate(source, value) {
@@ -88,7 +88,7 @@ export function mutate(source, value) {
 
 /**
  * @template V
- * @param {import('./types.js').Source<V>} signal
+ * @param {import('#client').Source<V>} signal
  * @param {V} value
  * @returns {V}
  */
@@ -150,9 +150,9 @@ export function set(signal, value) {
 		// @ts-expect-error
 		if (DEV && signal.inspect) {
 			if (is_batching_effect) {
-				set_last_inspected_signal(/** @type {import('./types.js').ValueDebug} */ (signal));
+				set_last_inspected_signal(/** @type {import('#client').ValueDebug} */ (signal));
 			} else {
-				for (const fn of /** @type {import('./types.js').ValueDebug} */ (signal).inspect) fn();
+				for (const fn of /** @type {import('#client').ValueDebug} */ (signal).inspect) fn();
 			}
 		}
 	}
diff --git a/packages/svelte/src/internal/client/reactivity/store.js b/packages/svelte/src/internal/client/reactivity/store.js
index 3cf286713910..fe2ef12971c4 100644
--- a/packages/svelte/src/internal/client/reactivity/store.js
+++ b/packages/svelte/src/internal/client/reactivity/store.js
@@ -10,13 +10,13 @@ import { mutable_source, set } from './sources.js';
  * signal that will be updated when the store is. The store references container is needed to
  * track reassignments to stores and to track the correct component context.
  * @template V
- * @param {import('../types.js').Store<V> | null | undefined} store
+ * @param {import('#client').Store<V> | null | undefined} store
  * @param {string} store_name
- * @param {import('../types.js').StoreReferencesContainer} stores
+ * @param {import('#client').StoreReferencesContainer} stores
  * @returns {V}
  */
 export function store_get(store, store_name, stores) {
-	/** @type {import('../types.js').StoreReferencesContainer[''] | undefined} */
+	/** @type {import('#client').StoreReferencesContainer[''] | undefined} */
 	let entry = stores[store_name];
 	const is_new = entry === undefined;
 
@@ -29,8 +29,8 @@ export function store_get(store, store_name, stores) {
 		};
 		// TODO: can we remove this code? it was refactored out when we split up source/comptued signals
 		// push_destroy_fn(entry.value, () => {
-		// 	/** @type {import('../types.js').StoreReferencesContainer['']} */ (entry).last_value =
-		// 		/** @type {import('../types.js').StoreReferencesContainer['']} */ (entry).value.value;
+		// 	/** @type {import('#client').StoreReferencesContainer['']} */ (entry).last_value =
+		// 		/** @type {import('#client').StoreReferencesContainer['']} */ (entry).value.value;
 		// });
 		stores[store_name] = entry;
 	}
@@ -49,8 +49,8 @@ export function store_get(store, store_name, stores) {
 
 /**
  * @template V
- * @param {import('../types.js').Store<V> | null | undefined} store
- * @param {import('../types.js').Source<V>} source
+ * @param {import('#client').Store<V> | null | undefined} store
+ * @param {import('#client').Source<V>} source
  */
 function connect_store_to_signal(store, source) {
 	if (store == null) {
@@ -70,7 +70,7 @@ function connect_store_to_signal(store, source) {
 /**
  * Sets the new value of a store and returns that value.
  * @template V
- * @param {import('../types.js').Store<V>} store
+ * @param {import('#client').Store<V>} store
  * @param {V} value
  * @returns {V}
  */
@@ -81,7 +81,7 @@ export function store_set(store, value) {
 
 /**
  * Unsubscribes from all auto-subscribed stores on destroy
- * @param {import('../types.js').StoreReferencesContainer} stores
+ * @param {import('#client').StoreReferencesContainer} stores
  */
 export function unsubscribe_on_destroy(stores) {
 	on_destroy(() => {
@@ -97,7 +97,7 @@ export function unsubscribe_on_destroy(stores) {
 
 /**
  * Updates a store with a new value.
- * @param {import('../types.js').Store<V>} store  the store to update
+ * @param {import('#client').Store<V>} store  the store to update
  * @param {any} expression  the expression that mutates the store
  * @param {V} new_value  the new store value
  * @template V
@@ -110,18 +110,18 @@ export function mutate_store(store, expression, new_value) {
 /**
  * @template V
  * @param {unknown} val
- * @returns {val is import('../types.js').Store<V>}
+ * @returns {val is import('#client').Store<V>}
  */
 export function is_store(val) {
 	return (
 		typeof val === 'object' &&
 		val !== null &&
-		typeof (/** @type {import('../types.js').Store<V>} */ (val).subscribe) === 'function'
+		typeof (/** @type {import('#client').Store<V>} */ (val).subscribe) === 'function'
 	);
 }
 
 /**
- * @param {import('../types.js').Store<number>} store
+ * @param {import('#client').Store<number>} store
  * @param {number} store_value
  * @param {1 | -1} [d]
  * @returns {number}
@@ -132,7 +132,7 @@ export function update_store(store, store_value, d = 1) {
 }
 
 /**
- * @param {import('../types.js').Store<number>} store
+ * @param {import('#client').Store<number>} store
  * @param {number} store_value
  * @param {1 | -1} [d]
  * @returns {number}
diff --git a/packages/svelte/src/internal/client/reactivity/types.d.ts b/packages/svelte/src/internal/client/reactivity/types.d.ts
index 0dc0b2d5a470..a390d83b03e3 100644
--- a/packages/svelte/src/internal/client/reactivity/types.d.ts
+++ b/packages/svelte/src/internal/client/reactivity/types.d.ts
@@ -78,8 +78,6 @@ export type Effect = {
 
 export type Reaction = Derived | Effect;
 
-export type Signal<V = unknown> = Source<V> | Reaction;
-
 export type MaybeSignal<T = unknown> = T | Source<T>;
 
 export type UnwrappedSignal<T> = T extends Value<infer U> ? U : T;
@@ -87,3 +85,5 @@ export type UnwrappedSignal<T> = T extends Value<infer U> ? U : T;
 export type Value<V = unknown> = Source<V> | Derived<V>;
 
 export type ValueDebug<V = unknown> = SourceDebug<V> | DerivedDebug<V>;
+
+export type Signal = Source | Derived | Effect;
diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 10cd320165db..abe296907ceb 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -865,8 +865,7 @@ export function mark_subtree_inert(signal, inert, visited_blocks = new Set()) {
 }
 
 /**
- * @template V
- * @param {import('./types.js').Signal<V>} signal
+ * @param {import('./types.js').Signal} signal
  * @param {number} to_status
  * @param {boolean} force_schedule
  * @returns {void}
@@ -962,9 +961,9 @@ export function push_destroy_fn(signal, destroy_fn) {
 }
 
 const STATUS_MASK = ~(DIRTY | MAYBE_DIRTY | CLEAN);
+
 /**
- * @template V
- * @param {import('./types.js').Signal<V>} signal
+ * @param {import('./types.js').Signal} signal
  * @param {number} status
  * @returns {void}
  */
@@ -974,14 +973,14 @@ export function set_signal_status(signal, status) {
 
 /**
  * @template V
- * @param {V | import('./types.js').Signal<V>} val
- * @returns {val is import('./types.js').Signal<V>}
+ * @param {V | import('./types.js').Value<V>} val
+ * @returns {val is import('./types.js').Value<V>}
  */
 export function is_signal(val) {
 	return (
 		typeof val === 'object' &&
 		val !== null &&
-		typeof (/** @type {import('./types.js').Signal<V>} */ (val).f) === 'number'
+		typeof (/** @type {import('./types.js').Value<V>} */ (val).f) === 'number'
 	);
 }
 
diff --git a/packages/svelte/src/internal/client/types.d.ts b/packages/svelte/src/internal/client/types.d.ts
index c1b42a7b949d..563835384d54 100644
--- a/packages/svelte/src/internal/client/types.d.ts
+++ b/packages/svelte/src/internal/client/types.d.ts
@@ -27,13 +27,13 @@ export type Store<V> = {
 
 export type ComponentContext = {
 	/** local signals (needed for beforeUpdate/afterUpdate) */
-	d: null | Signal<any>[];
+	d: null | Source[];
 	/** props */
 	s: Record<string, unknown>;
 	/** exports (and props, if `accessors: true`) */
 	x: Record<string, any> | null;
 	/** effects */
-	e: null | Array<Effect>;
+	e: null | Effect[];
 	/** mounted */
 	m: boolean;
 	/** parent */
@@ -223,11 +223,11 @@ export type EachItemBlock = {
 	/** dom */
 	d: null | TemplateNode | Array<TemplateNode>;
 	/** effect */
-	e: null | Reaction;
+	e: null | Effect;
 	/** item */
-	v: any | Value<any>;
+	v: any | Source<any>;
 	/** index */
-	i: number | Value<number>;
+	i: number | Source<number>;
 	/** key */
 	k: unknown;
 	/** parent */
@@ -292,7 +292,7 @@ export type StoreReferencesContainer = Record<
 		store: Store<any> | null;
 		last_value: any;
 		unsubscribe: Function;
-		value: Value<any>;
+		value: Source<any>;
 	}
 >;
 
diff --git a/packages/svelte/tests/signals/test.ts b/packages/svelte/tests/signals/test.ts
index 07e5716edf31..8791a434d440 100644
--- a/packages/svelte/tests/signals/test.ts
+++ b/packages/svelte/tests/signals/test.ts
@@ -1,10 +1,10 @@
 import { describe, assert, it } from 'vitest';
 import * as $ from '../../src/internal/client/runtime';
-import { derived } from '../../src/internal/client/reactivity/deriveds';
 import { effect, render_effect, user_effect } from '../../src/internal/client/reactivity/effects';
 import { source, set } from '../../src/internal/client/reactivity/sources';
 import type { Derived } from '../../src/internal/client/types';
 import { proxy } from '../../src/internal/client/proxy';
+import { derived } from '../../src/internal/client/reactivity/deriveds';
 
 /**
  * @param runes runes mode