svelte-asyncable
A tiny, declarative, optimistic async store for Svelte that stores values as promises.
What is svelte-asyncable?
svelte-asyncable is a Svelte store extension that seamlessly handles asynchronous values, enabling developers to manage async state with the same reactive patterns as regular Svelte stores. It simplifies side-effect management and supports optimistic UI updates, making it ideal for data fetching and synchronization in Svelte applications.
Svelte developers building applications that require asynchronous data fetching, state synchronization, or optimistic UI updates, particularly those looking for a minimalistic, declarative approach to async state management.
Developers choose svelte-asyncable for its seamless integration with Svelte's reactive ecosystem, built-in support for optimistic updates, lazy initialization, and declarative side-effect management, reducing boilerplate and complexity compared to manual async handling.
Overview
Asyncable store for Svelte 3 which is store a value as promise.
Use Cases
Best For
- Managing asynchronous data fetching and state in Svelte applications with reactive stores.
- Implementing optimistic UI updates where the interface responds immediately before async operations complete.
- Creating read-only or writable async stores with declarative side-effects for getter and setter operations.
- Synchronizing application state with external sources like APIs or localStorage in a declarative manner.
- Deriving async stores from other stores (including asyncable stores) with automatic re-evaluation on dependency changes.
- Optimizing performance through lazy initialization and caching of async results for the lifetime of subscribers.
Not Ideal For
- Projects using frameworks other than Svelte, as it's tightly coupled with Svelte's reactive ecosystem and store contract.
- Applications requiring advanced state management features like middleware, time-travel debugging, or extensive devtools integration, since it's minimalistic and focused solely on async stores.
- Teams already leveraging SvelteKit's built-in data fetching (e.g., load functions) extensively, which might overlap or conflict with svelte-asyncable's client-side async handling.
Pros & Cons
Pros
Extends the Svelte store contract, allowing async values to be used with auto-subscriptions and reactive patterns, just like regular stores, as shown in the README's Svelte component example.
Provides transparent getter and setter callbacks for async operations, simplifying side-effect management without manual promise handling, evident in the localStorage synchronization example.
Includes built-in optimistic update patterns, enabling immediate UI feedback before async operations complete, with automatic rollback on setter failures per the README.
Defers async calls until first subscription and caches results for the subscriber lifetime, reducing redundant network requests and improving performance, as detailed in the caching section.
Can derive from other stores, automatically re-evaluating when dependencies change, making it easy to compose async states, demonstrated with asyncable stores depending on each other.
Cons
As a specialized library for Svelte, it has fewer third-party integrations, plugins, or community resources compared to more general state management solutions like Redux or even Svelte's own ecosystem tools.
While it supports automatic rollbacks on setter failures, comprehensive error handling for async operations may require additional custom logic and boilerplate, not extensively covered in the README.
The README is concise but lacks in-depth examples, tutorials, or best practices for complex scenarios like testing, TypeScript integration, or scaling in large applications, which could hinder adoption.
Frequently Asked Questions
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