gemini-nexus/.agent/skills/vercel-react-best-practices/rules/async-defer-await.md

---
title: Defer Await Until Needed
impact: HIGH
impactDescription: avoids blocking unused code paths
tags: async, await, conditional, optimization
---

## Defer Await Until Needed

Move `await` operations into the branches where they're actually used to avoid blocking code paths that don't need them.

**Incorrect (blocks both branches):**

```typescript
async function handleRequest(userId: string, skipProcessing: boolean) {
  const userData = await fetchUserData(userId);

  if (skipProcessing) {
    // Returns immediately but still waited for userData
    return { skipped: true };
  }

  // Only this branch uses userData
  return processUserData(userData);
}
```

**Correct (only blocks when needed):**

```typescript
async function handleRequest(userId: string, skipProcessing: boolean) {
  if (skipProcessing) {
    // Returns immediately without waiting
    return { skipped: true };
  }

  // Fetch only when needed
  const userData = await fetchUserData(userId);
  return processUserData(userData);
}
```

**Another example (early return optimization):**

```typescript
// Incorrect: always fetches permissions
async function updateResource(resourceId: string, userId: string) {
  const permissions = await fetchPermissions(userId);
  const resource = await getResource(resourceId);

  if (!resource) {
    return { error: 'Not found' };
  }

  if (!permissions.canEdit) {
    return { error: 'Forbidden' };
  }

  return await updateResourceData(resource, permissions);
}

// Correct: fetches only when needed
async function updateResource(resourceId: string, userId: string) {
  const resource = await getResource(resourceId);

  if (!resource) {
    return { error: 'Not found' };
  }

  const permissions = await fetchPermissions(userId);

  if (!permissions.canEdit) {
    return { error: 'Forbidden' };
  }

  return await updateResourceData(resource, permissions);
}
```

This optimization is especially valuable when the skipped branch is frequently taken, or when the deferred operation is expensive.