Unblock React Compiler for 5 components by removing render-phase mutation

Four shapes of writing to something the compiler has frozen:

- Reanimated shared values written as `sv.value = x`, now `sv.set(x)` to match
  the sibling calls already in those files
- debug globals installed during render, now installed in an effect
- a running flag mutated inside a `.filter()` callback, now a plain loop
- tagging metadata inside a hook, now a module-scope helper

Skipped components: 125 -> 120. Composer also loses its Immutability error but
stays skipped on a Refs error underneath.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/analytics/utils.ts

@@ -11,14 +11,18 @@ import {
  * Thin `useMemo` wrapper that marks the metadata as memoized and provides a
  * type guard.
  */
-export function useMeta(metadata?: MergeableMetadata) {
-  const m = useMemo(() => metadata, [metadata])
-  if (!m) return
+function markMemoized<T extends MergeableMetadata>(m: T): T {
   // @ts-expect-error
   m.__meta = true
   return m
 }
 
+export function useMeta(metadata?: MergeableMetadata) {
+  const m = useMemo(() => metadata, [metadata])
+  if (!m) return
+  return markMemoized(m)
+}
+
 export function accountToSessionMetadata(
   account: SessionAccount | undefined,
 ): SessionMetadata | undefined {

src/components/Composer/index.tsx

@@ -362,9 +362,9 @@ export function Composer({
           onKeyPress={IS_WEB ? onKeyPressWeb : undefined}
           onScroll={e => {
             if (IS_WEB) {
-              inputScrollSharedValue.value = (e.target as any).scrollTop
+              inputScrollSharedValue.set((e.target as any).scrollTop)
             } else {
-              inputScrollSharedValue.value = e.nativeEvent.contentOffset.y
+              inputScrollSharedValue.set(e.nativeEvent.contentOffset.y)
             }
           }}
           // @ts-expect-error web only

src/components/dialogs/nuxs/index.tsx

@@ -116,14 +116,15 @@ function Inner({
     setActiveNux(undefined)
   }, [activeNux, setActiveNux])
 
-  if (__DEV__ && typeof window !== 'undefined') {
-    // @ts-expect-error
+  useEffect(() => {
+    if (!__DEV__ || typeof window === 'undefined') return
+    // @ts-expect-error debug only
     window.clearNuxDialog = (id: Nux) => {
-      if (!__DEV__ || !id) return
+      if (!id) return
       resetNuxs([id])
       unsnooze()
     }
-  }
+  }, [resetNuxs])
 
   useEffect(() => {
     if (snoozed) return // comment this out to test

src/components/moderation/ContentHider.tsx

@@ -101,35 +101,33 @@ function ContentHiderActive({
       }
     }
 
+    /*
+     * A plain loop rather than `.filter()`: the running flag has to be mutated
+     * from the enclosing scope, which React Compiler cannot lower inside a
+     * callback. Keeps only the first adult-content label, as before.
+     */
+    const selfBlurCauses = []
     let hasAdultContentLabel = false
-    const selfBlurNames = modui.blurs
-      .filter(cause => {
-        if (cause.type !== 'label') {
-          return false
-        }
-        if (cause.source.type !== 'user') {
-          return false
-        }
-        if (ADULT_CONTENT_LABELS.includes(cause.label.val as AdultSelfLabel)) {
-          if (hasAdultContentLabel) {
-            return false
-          }
-          hasAdultContentLabel = true
-        }
-        return true
-      })
-      .slice(0, 2)
-      .map(cause => {
-        if (cause.type !== 'label') {
-          return
-        }
+    for (const cause of modui.blurs) {
+      if (cause.type !== 'label') continue
+      if (cause.source.type !== 'user') continue
+      if (ADULT_CONTENT_LABELS.includes(cause.label.val as AdultSelfLabel)) {
+        if (hasAdultContentLabel) continue
+        hasAdultContentLabel = true
+      }
+      selfBlurCauses.push(cause)
+    }
+    const selfBlurNames = selfBlurCauses.slice(0, 2).map(cause => {
+      if (cause.type !== 'label') {
+        return
+      }
 
-        const def = cause.labelDef || getDefinition(labelDefs, cause.label)
-        if (def.identifier === 'porn' || def.identifier === 'sexual') {
-          return l`Adult Content`
-        }
-        return getLabelStrings(i18n.locale, globalLabelStrings, def).name
-      })
+      const def = cause.labelDef || getDefinition(labelDefs, cause.label)
+      if (def.identifier === 'porn' || def.identifier === 'sexual') {
+        return l`Adult Content`
+      }
+      return getLabelStrings(i18n.locale, globalLabelStrings, def).name
+    })
 
     if (selfBlurNames.length === 0) {
       return desc.name

src/state/session/index.tsx

@@ -683,9 +683,11 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
   const bundle = state.currentBundleState.bundle as unknown as
     SessionBundle | PublicSessionBundle
 
-  // @ts-expect-error window type is not declared, debug only
-  // eslint-disable-next-line react-hooks/immutability
-  if (__DEV__ && IS_WEB) window.bundle = bundle
+  useEffect(() => {
+    if (!__DEV__ || !IS_WEB) return
+    // @ts-expect-error window type is not declared, debug only
+    window.bundle = bundle
+  }, [bundle])
 
   const currentBundleRef = useRef(bundle)
   /*

src/view/com/pager/TabBar.tsx

@@ -332,7 +332,7 @@ export function TabBar({
             syncScrollState.set('unsynced')
           }}
           onScroll={e => {
-            scrollX.value = Math.round(e.nativeEvent.contentOffset.x)
+            scrollX.set(Math.round(e.nativeEvent.contentOffset.x))
           }}>
           <Animated.View
             onLayout={e => {