chore: remove unused code from signal logic (#15195)

.changeset/blue-sheep-joke.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: remove unused code from signal logic

packages/svelte/src/internal/client/reactivity/deriveds.js

@@ -176,15 +176,3 @@ export function update_derived(derived) {
 		derived.wv = increment_write_version();
 	}
 }
-
-/**
- * @param {Derived} derived
- * @returns {void}
- */
-export function destroy_derived(derived) {
-	destroy_derived_effects(derived);
-	remove_reactions(derived, 0);
-	set_signal_status(derived, DESTROYED);
-
-	derived.v = derived.deps = derived.ctx = derived.reactions = null;
-}

packages/svelte/src/internal/client/reactivity/effects.js

@@ -42,7 +42,7 @@ import * as e from '../errors.js';
 import { DEV } from 'esm-env';
 import { define_property } from '../../shared/utils.js';
 import { get_next_sibling } from '../dom/operations.js';
-import { derived, destroy_derived } from './deriveds.js';
+import { derived } from './deriveds.js';
 import { component_context, dev_current_component_function } from '../context.js';
 
 /**

packages/svelte/src/internal/client/runtime.js

@@ -27,12 +27,7 @@ import {
 } from './constants.js';
 import { flush_tasks } from './dom/task.js';
 import { internal_set } from './reactivity/sources.js';
-import {
+import { destroy_derived_effects, update_derived } from './reactivity/deriveds.js';
-	destroy_derived,
-	destroy_derived_effects,
-	execute_derived,
-	update_derived
-} from './reactivity/deriveds.js';
 import * as e from './errors.js';
 import { FILENAME } from '../../constants.js';
 import { tracing_mode_flag } from '../flags/index.js';
@@ -919,15 +914,6 @@ export function get(signal) {
 	var flags = signal.f;
 	var is_derived = (flags & DERIVED) !== 0;
 
-	// If the derived is destroyed, just execute it again without retaining
-	// its memoisation properties as the derived is stale
-	if (is_derived && (flags & DESTROYED) !== 0) {
-		var value = execute_derived(/** @type {Derived} */ (signal));
-		// Ensure the derived remains destroyed
-		destroy_derived(/** @type {Derived} */ (signal));
-		return value;
-	}
-
 	if (captured_signals !== null) {
 		captured_signals.add(signal);
 	}