diff --git a/packages/svelte/src/internal/client/dev/inspect.js b/packages/svelte/src/internal/client/dev/inspect.js
index b907f396dc..89e7e939ec 100644
--- a/packages/svelte/src/internal/client/dev/inspect.js
+++ b/packages/svelte/src/internal/client/dev/inspect.js
@@ -13,8 +13,7 @@ export function inspect(get_value, inspector = console.log) {
 	let initial = true;
 
 	inspect_effect(() => {
-		const value = deep_snapshot(get_value());
-		inspector(initial ? 'init' : 'update', ...value);
+		inspector(initial ? 'init' : 'update', ...deep_snapshot(get_value()));
 		initial = false;
 	});
 }
diff --git a/packages/svelte/src/internal/client/reactivity/sources.js b/packages/svelte/src/internal/client/reactivity/sources.js
index da713bcc01..904d99332e 100644
--- a/packages/svelte/src/internal/client/reactivity/sources.js
+++ b/packages/svelte/src/internal/client/reactivity/sources.js
@@ -23,21 +23,18 @@ import * as e from '../errors.js';
 
 /**
  * @template V
- * @param {V} value
+ * @param {V} v
  * @returns {import('#client').Source<V>}
  */
 /*#__NO_SIDE_EFFECTS__*/
-export function source(value) {
-	/** @type {import('#client').Source<V>} */
-	const source = {
+export function source(v) {
+	return {
 		f: 0, // TODO ideally we could skip this altogether, but it causes type errors
+		v,
 		reactions: null,
-		equals: equals,
-		v: value,
+		equals,
 		version: 0
 	};
-
-	return source;
 }
 
 /**
diff --git a/packages/svelte/src/internal/client/reactivity/types.d.ts b/packages/svelte/src/internal/client/reactivity/types.d.ts
index e1d420c570..4d77a68a13 100644
--- a/packages/svelte/src/internal/client/reactivity/types.d.ts
+++ b/packages/svelte/src/internal/client/reactivity/types.d.ts
@@ -53,12 +53,6 @@ export interface Effect extends Reaction {
 	component_function?: any;
 }
 
-export interface ValueDebug<V = unknown> extends Value<V> {
-	inspect: Set<Function>;
-}
-
-export interface DerivedDebug<V = unknown> extends Derived<V>, ValueDebug<V> {}
-
 export type Source<V = unknown> = Value<V>;
 
 export type MaybeSource<T = unknown> = T | Source<T>;
diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 126caaf90f..cbe2b15739 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -104,14 +104,6 @@ export function set_current_untracked_writes(value) {
 	current_untracked_writes = value;
 }
 
-/** @type {null | import('#client').ValueDebug} */
-export let last_inspected_signal = null;
-
-/** @param {null | import('#client').ValueDebug} signal */
-export function set_last_inspected_signal(signal) {
-	last_inspected_signal = signal;
-}
-
 /** @type {number} Used by sources and deriveds for handling updates to unowned deriveds */
 let current_version = 0;