From d1e0ee68d22b8f7617aceff67b9ed41a3b2294ee Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Fri, 24 Oct 2025 10:07:20 -0400
Subject: [PATCH] fix: less confusing names for inspect errors

---
 .changeset/swift-taxes-shake.md                            | 5 +++++
 packages/svelte/src/internal/client/dev/inspect.js         | 3 ++-
 packages/svelte/src/internal/client/dev/tracing.js         | 3 +--
 packages/svelte/src/internal/client/proxy.js               | 2 +-
 packages/svelte/src/internal/client/reactivity/deriveds.js | 2 +-
 packages/svelte/src/internal/client/reactivity/sources.js  | 4 ++--
 packages/svelte/src/internal/client/runtime.js             | 4 ++--
 7 files changed, 14 insertions(+), 9 deletions(-)
 create mode 100644 .changeset/swift-taxes-shake.md

diff --git a/.changeset/swift-taxes-shake.md b/.changeset/swift-taxes-shake.md
new file mode 100644
index 0000000000..73b1529d87
--- /dev/null
+++ b/.changeset/swift-taxes-shake.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: less confusing names for inspect errors
diff --git a/packages/svelte/src/internal/client/dev/inspect.js b/packages/svelte/src/internal/client/dev/inspect.js
index db7ab0d976..287710bd34 100644
--- a/packages/svelte/src/internal/client/dev/inspect.js
+++ b/packages/svelte/src/internal/client/dev/inspect.js
@@ -33,8 +33,9 @@ export function inspect(get_value, inspector, show_stack = false) {
 				inspector(...snap);
 
 				if (!initial) {
+					const stack = get_stack('$inspect(...)');
 					// eslint-disable-next-line no-console
-					console.log(get_stack('UpdatedAt'));
+					if (stack) console.log(stack);
 				}
 			} else {
 				inspector(initial ? 'init' : 'update', ...snap);
diff --git a/packages/svelte/src/internal/client/dev/tracing.js b/packages/svelte/src/internal/client/dev/tracing.js
index 98be92d4b2..4688637f5d 100644
--- a/packages/svelte/src/internal/client/dev/tracing.js
+++ b/packages/svelte/src/internal/client/dev/tracing.js
@@ -179,8 +179,7 @@ export function get_stack(label) {
 	});
 
 	define_property(error, 'name', {
-		// 'Error' suffix is required for stack traces to be rendered properly
-		value: `${label}Error`
+		value: label
 	});
 
 	return /** @type {Error & { stack: string }} */ (error);
diff --git a/packages/svelte/src/internal/client/proxy.js b/packages/svelte/src/internal/client/proxy.js
index dae3791eb0..07b06e716f 100644
--- a/packages/svelte/src/internal/client/proxy.js
+++ b/packages/svelte/src/internal/client/proxy.js
@@ -53,7 +53,7 @@ export function proxy(value) {
 	var is_proxied_array = is_array(value);
 	var version = source(0);
 
-	var stack = DEV && tracing_mode_flag ? get_stack('CreatedAt') : null;
+	var stack = DEV && tracing_mode_flag ? get_stack('created at') : null;
 	var parent_version = update_version;
 
 	/**
diff --git a/packages/svelte/src/internal/client/reactivity/deriveds.js b/packages/svelte/src/internal/client/reactivity/deriveds.js
index 5a3dee4b7f..ee1f44a94d 100644
--- a/packages/svelte/src/internal/client/reactivity/deriveds.js
+++ b/packages/svelte/src/internal/client/reactivity/deriveds.js
@@ -86,7 +86,7 @@ export function derived(fn) {
 	};
 
 	if (DEV && tracing_mode_flag) {
-		signal.created = get_stack('CreatedAt');
+		signal.created = get_stack('created at');
 	}
 
 	return signal;
diff --git a/packages/svelte/src/internal/client/reactivity/sources.js b/packages/svelte/src/internal/client/reactivity/sources.js
index 2fe8c4f75d..804a33cbdc 100644
--- a/packages/svelte/src/internal/client/reactivity/sources.js
+++ b/packages/svelte/src/internal/client/reactivity/sources.js
@@ -76,7 +76,7 @@ export function source(v, stack) {
 	};
 
 	if (DEV && tracing_mode_flag) {
-		signal.created = stack ?? get_stack('CreatedAt');
+		signal.created = stack ?? get_stack('created at');
 		signal.updated = null;
 		signal.set_during_effect = false;
 		signal.trace = null;
@@ -186,7 +186,7 @@ export function internal_set(source, value) {
 
 		if (DEV) {
 			if (tracing_mode_flag || active_effect !== null) {
-				const error = get_stack('UpdatedAt');
+				const error = get_stack('updated at');
 
 				if (error !== null) {
 					source.updated ??= new Map();
diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 2e6f05b4b1..49396d6feb 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -609,7 +609,7 @@ export function get(signal) {
 			if (!tracking && !untracking && !was_read) {
 				w.await_reactivity_loss(/** @type {string} */ (signal.label));
 
-				var trace = get_stack('TracedAt');
+				var trace = get_stack('traced at');
 				// eslint-disable-next-line no-console
 				if (trace) console.warn(trace);
 			}
@@ -628,7 +628,7 @@ export function get(signal) {
 			if (signal.trace) {
 				signal.trace();
 			} else {
-				trace = get_stack('TracedAt');
+				trace = get_stack('traced at');
 
 				if (trace) {
 					var entry = tracing_expressions.entries.get(signal);