Sequence() for Composing Hooks
Chain multiple handle() functions together with the sequence() helper.
Sequence() for Composing Hooks is a free Sveltejs Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Composing handle
Multiple handle hooks combine into one chain with sequence.
Import sequence
From @sveltejs/kit/hooks.
import { sequence } from "@sveltejs/kit/hooks";Compose Functions
Each function takes { event, resolve } and returns a Response. They run in order.
export const handle = sequence(auth, logging, cors);Why Compose
Splitting concerns into separate hooks keeps each function focused and reusable.
Modifying event Locals
An auth hook attaches user to locals; subsequent hooks can read it.
Chaining resolve
Each hook calls await resolve(event); sequence wires them together.
Skipping Conditions
A hook can short-circuit by returning early without calling resolve.
Ordering Matters
Put auth before route handlers; logging at the start; CORS at the end.
Testability
Each individual hook is easier to test in isolation when split.
Performance
Many small hooks have negligible overhead; favor clarity over premature optimization.
Real Example
Auth + i18n + CSP + logging is a common production stack composed via sequence.
Quick Check
What does sequence() return?
Recap
Use sequence() from @sveltejs/kit/hooks to compose multiple handle hooks for clean separation.
Frequently asked questions
Is the “Sequence() for Composing Hooks” lesson free?
Yes — the full text of “Sequence() for Composing Hooks” is free to read here on the web, and the Sveltejs Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO.
What will I learn in “Sequence() for Composing Hooks”?
Chain multiple handle() functions together with the sequence() helper. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Sequence() for Composing Hooks” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- The handle() Hook: Middleware for Requests
- handleError for Server Error Logging
- The init() Hook
- Sequence() for Composing Hooks