From 49cba86e9b604f66bcd037e5eeb7a27788510b3b Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Wed, 2 Jul 2025 11:19:51 -0400
Subject: [PATCH] chore: rename EFFECT_HAS_DERIVED to EFFECT_PRESERVED (#16283)

---
 packages/svelte/src/internal/client/constants.js           | 2 +-
 packages/svelte/src/internal/client/reactivity/deriveds.js | 4 ++--
 packages/svelte/src/internal/client/reactivity/effects.js  | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/svelte/src/internal/client/constants.js b/packages/svelte/src/internal/client/constants.js
index cd5e0d2244..38db28fecf 100644
--- a/packages/svelte/src/internal/client/constants.js
+++ b/packages/svelte/src/internal/client/constants.js
@@ -17,7 +17,7 @@ export const EFFECT_RAN = 1 << 15;
 export const EFFECT_TRANSPARENT = 1 << 16;
 export const INSPECT_EFFECT = 1 << 18;
 export const HEAD_EFFECT = 1 << 19;
-export const EFFECT_HAS_DERIVED = 1 << 20;
+export const EFFECT_PRESERVED = 1 << 20;
 export const EFFECT_IS_UPDATING = 1 << 21;
 
 export const STATE_SYMBOL = Symbol('$state');
diff --git a/packages/svelte/src/internal/client/reactivity/deriveds.js b/packages/svelte/src/internal/client/reactivity/deriveds.js
index d3123d24a1..fdfc13c0e2 100644
--- a/packages/svelte/src/internal/client/reactivity/deriveds.js
+++ b/packages/svelte/src/internal/client/reactivity/deriveds.js
@@ -1,6 +1,6 @@
 /** @import { Derived, Effect } from '#client' */
 import { DEV } from 'esm-env';
-import { CLEAN, DERIVED, DIRTY, EFFECT_HAS_DERIVED, MAYBE_DIRTY, UNOWNED } from '#client/constants';
+import { CLEAN, DERIVED, DIRTY, EFFECT_PRESERVED, MAYBE_DIRTY, UNOWNED } from '#client/constants';
 import {
 	active_reaction,
 	active_effect,
@@ -38,7 +38,7 @@ export function derived(fn) {
 	} else {
 		// Since deriveds are evaluated lazily, any effects created inside them are
 		// created too late to ensure that the parent effect is added to the tree
-		active_effect.f |= EFFECT_HAS_DERIVED;
+		active_effect.f |= EFFECT_PRESERVED;
 	}
 
 	/** @type {Derived<V>} */
diff --git a/packages/svelte/src/internal/client/reactivity/effects.js b/packages/svelte/src/internal/client/reactivity/effects.js
index a2de8940a6..702c410ce8 100644
--- a/packages/svelte/src/internal/client/reactivity/effects.js
+++ b/packages/svelte/src/internal/client/reactivity/effects.js
@@ -31,7 +31,7 @@ import {
 	INSPECT_EFFECT,
 	HEAD_EFFECT,
 	MAYBE_DIRTY,
-	EFFECT_HAS_DERIVED,
+	EFFECT_PRESERVED,
 	BOUNDARY_EFFECT,
 	STALE_REACTION
 } from '#client/constants';
@@ -135,7 +135,7 @@ function create_effect(type, fn, sync, push = true) {
 		effect.first === null &&
 		effect.nodes_start === null &&
 		effect.teardown === null &&
-		(effect.f & (EFFECT_HAS_DERIVED | BOUNDARY_EFFECT)) === 0;
+		(effect.f & (EFFECT_PRESERVED | BOUNDARY_EFFECT)) === 0;
 
 	if (!inert && push) {
 		if (parent !== null) {