viniersiren
60 lines
1.4 KiB
Markdown
60 lines
1.4 KiB
Markdown
# Synced Store
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Utility for creating Svelte stores that automatically persist to and restore from storage providers.
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## Functions
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### synced(config)
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Creates a writable store that synchronizes with a storage provider using JSON serialization.
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**Parameters:**
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- `config` - Configuration object containing:
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- `key` - Storage key to store the value under
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- `storage` - Storage provider implementing the StorageProvider interface
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- `defaultValue` - Default value if nothing exists in storage
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**Returns:** Writable Svelte store that persists changes to storage
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The store automatically:
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- Loads initial value from storage on creation
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- Saves any changes back to storage
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- Falls back to defaultValue if storage is empty or invalid
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## Storage Provider Interface
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```typescript
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interface StorageProvider {
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get: (key: string) => Promise<any>
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set: (key: string, value: any) => Promise<void>
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}
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```
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## Example
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```typescript
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import {synced, localStorageProvider} from "@welshman/store"
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// Create a store that persists user preferences using localStorage
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const userPreferences = synced({
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key: "user-prefs",
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storage: localStorageProvider,
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defaultValue: {
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theme: "dark",
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notifications: true,
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language: "en"
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}
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})
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// Use like any writable store
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userPreferences.subscribe(prefs => {
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console.log("Preferences:", prefs)
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})
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// Update the store - automatically saves to storage
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userPreferences.update(prefs => ({
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...prefs,
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theme: "light"
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}))
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```
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