diff --git a/packages/svelte/src/internal/client/reactivity/computations.js b/packages/svelte/src/internal/client/reactivity/computations.js
index fabd86a09d..7897f39590 100644
--- a/packages/svelte/src/internal/client/reactivity/computations.js
+++ b/packages/svelte/src/internal/client/reactivity/computations.js
@@ -24,66 +24,30 @@ import { default_equals, safe_equal } from './equality.js';
  * @param {import('../types.js').SignalFlags} flags
  * @param {V} value
  * @param {import('../types.js').Block | null} block
- * @returns {import('../types.js').ComputationSignal<V> | import('../types.js').ComputationSignal<V> & import('../types.js').SourceSignalDebug}
  */
 function create_computation_signal(flags, value, block) {
-	if (DEV) {
-		return {
-			// block
-			b: block,
-			// consumers
-			c: null,
-			// destroy
-			d: null,
-			// equals
-			e: null,
-			// flags
-			f: flags,
-			// init
-			i: null,
-			// level
-			l: 0,
-			// references
-			r: null,
-			// value
-			v: value,
-			// write version
-			w: 0,
-			// context: We can remove this if we get rid of beforeUpdate/afterUpdate
-			x: null,
-			// destroy
-			y: null,
-			// this is for DEV only
-			inspect: new Set()
-		};
-	}
-
-	return {
-		// block
+	/** @type {import('../types.js').ComputationSignal<V>} */
+	const signal = {
 		b: block,
-		// consumers
 		c: null,
-		// destroy
 		d: null,
-		// equals
 		e: null,
-		// flags
 		f: flags,
-		// level
 		l: 0,
-		// init
 		i: null,
-		// references
 		r: null,
-		// value
 		v: value,
-		// write version
 		w: 0,
-		// context: We can remove this if we get rid of beforeUpdate/afterUpdate
 		x: null,
-		// destroy
 		y: null
 	};
+
+	if (DEV) {
+		// @ts-expect-error
+		signal.inspect = new Set();
+	}
+
+	return signal;
 }
 
 /**