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Kaj Kowalski
cd05fc8648
- Fix syntax errors in skills markdown files (.github/skills, .opencode/skills) - Change typescript to tsx for code blocks with JSX - Replace ellipsis (...) in array examples with valid syntax - Separate CSS from TypeScript into distinct code blocks - Convert JavaScript object examples to valid JSON in docs - Fix enum definitions with proper comma separation
2.0 KiB
2.0 KiB
title, impact, impactDescription, tags
| title | impact | impactDescription | tags |
|---|---|---|---|
| Defer Await Until Needed | HIGH | avoids blocking unused code paths | 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):
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):
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):
// 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.