Revert "unused"

This reverts commit a95b625800.

packages/svelte/src/internal/client/dev/tracing.js

@@ -4,7 +4,7 @@ import { snapshot } from '../../shared/clone.js';
 import { define_property } from '../../shared/utils.js';
 import { DERIVED, PROXY_PATH_SYMBOL, STATE_SYMBOL } from '#client/constants';
 import { effect_tracking } from '../reactivity/effects.js';
-import { active_reaction } from '../runtime.js';
+import { active_reaction, captured_signals, set_captured_signals, untrack } from '../runtime.js';
 
 /**
  * @typedef {{

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

@@ -137,6 +137,11 @@ export let skip_reaction = false;
 /** @type {Set<Value> | null} */
 export let captured_signals = null;
 
+/** @param {Set<Value> | null} value */
+export function set_captured_signals(value) {
+	captured_signals = value;
+}
+
 export function increment_write_version() {
 	return ++write_version;
 }