From 152fe5019b8414f2862df27b65bd6ef1f1b0d3a2 Mon Sep 17 00:00:00 2001
From: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>
Date: Sat, 31 May 2025 16:10:47 -0700
Subject: [PATCH] add test, fix more stuff

---
 .../server/visitors/AssignmentExpression.js   |  5 ----
 .../_expected/client/index.svelte.js          | 23 ++++++++++++++++++-
 .../_expected/server/index.svelte.js          | 23 ++++++++++++++++++-
 .../index.svelte                              |  7 ++++--
 4 files changed, 49 insertions(+), 9 deletions(-)

diff --git a/packages/svelte/src/compiler/phases/3-transform/server/visitors/AssignmentExpression.js b/packages/svelte/src/compiler/phases/3-transform/server/visitors/AssignmentExpression.js
index 7a054fcbb4..fc660f89c9 100644
--- a/packages/svelte/src/compiler/phases/3-transform/server/visitors/AssignmentExpression.js
+++ b/packages/svelte/src/compiler/phases/3-transform/server/visitors/AssignmentExpression.js
@@ -49,11 +49,6 @@ function build_assignment(operator, left, right, context) {
 					/** @type {Expression} */ (context.visit(right))
 				);
 			}
-		} else if (field && (field.type === '$derived' || field.type === '$derived.by')) {
-			let value = /** @type {Expression} */ (
-				context.visit(build_assignment_value(operator, left, right))
-			);
-			return b.call(b.member(b.this, name), value);
 		}
 	}
 
diff --git a/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/_expected/client/index.svelte.js b/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/_expected/client/index.svelte.js
index 2133974176..c9725d6718 100644
--- a/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/_expected/client/index.svelte.js
+++ b/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/_expected/client/index.svelte.js
@@ -5,7 +5,7 @@ export default function Class_state_field_constructor_assignment($$anchor, $$pro
 	$.push($$props, true);
 
 	class Foo {
-		#a = $.state();
+		#a = $.state(0);
 
 		get a() {
 			return $.get(this.#a);
@@ -16,10 +16,31 @@ export default function Class_state_field_constructor_assignment($$anchor, $$pro
 		}
 
 		#b = $.state();
+		#foo = $.derived(() => ({ bar: this.a * 2 }));
+
+		get foo() {
+			return $.get(this.#foo);
+		}
+
+		set foo(value) {
+			$.set(this.#foo, value);
+		}
+
+		#bar = $.derived(() => ({ baz: this.foo }));
+
+		get bar() {
+			return $.get(this.#bar);
+		}
+
+		set bar(value) {
+			$.set(this.#bar, value);
+		}
 
 		constructor() {
 			this.a = 1;
 			$.set(this.#b, 2);
+			this.foo.bar = 3;
+			this.bar = 4;
 		}
 	}
 
diff --git a/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/_expected/server/index.svelte.js b/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/_expected/server/index.svelte.js
index 2a115a4983..abfc264fea 100644
--- a/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/_expected/server/index.svelte.js
+++ b/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/_expected/server/index.svelte.js
@@ -4,12 +4,33 @@ export default function Class_state_field_constructor_assignment($$payload, $$pr
 	$.push();
 
 	class Foo {
-		a;
+		a = 0;
 		#b;
+		#foo = $.derived(() => ({ bar: this.a * 2 }));
+
+		get foo() {
+			return this.#foo();
+		}
+
+		set foo($$value) {
+			return this.#foo($$value);
+		}
+
+		#bar = $.derived(() => ({ baz: this.foo }));
+
+		get bar() {
+			return this.#bar();
+		}
+
+		set bar($$value) {
+			return this.#bar($$value);
+		}
 
 		constructor() {
 			this.a = 1;
 			this.#b = 2;
+			this.foo.bar = 3;
+			this.bar = 4;
 		}
 	}
 
diff --git a/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/index.svelte b/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/index.svelte
index a3ff5917e7..127cfd4d2a 100644
--- a/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/index.svelte
+++ b/packages/svelte/tests/snapshot/samples/class-state-field-constructor-assignment/index.svelte
@@ -1,11 +1,14 @@
 <script>
 	class Foo {
-		a = $state();
+		a = $state(0);
 		#b = $state();
-
+		foo = $derived({ bar: this.a * 2 });
+		bar = $derived({ baz: this.foo });
 		constructor() {
 			this.a = 1;
 			this.#b = 2;
+			this.foo.bar = 3;
+			this.bar = 4;
 		}
 	}
 </script>