Function writable

writable<T>(value, options?): WritableSignal<T>
A convenience function to create Writable store instances.
Type Parameters
- T
Parameters
- value: T
  initial value of a new writable store.
- options: StoreOptions<T> | OnUseFn<T> = {}
  Either an object with store options, or directly the onUse function.
  
  The onUse function is a function called when the number of subscribers changes from 0 to 1 (but not called when the number of subscribers changes from 1 to 2, ...).
  
  If a function is returned, it will be called when the number of subscribers changes from 1 to 0.
Returns WritableSignal<T>
Example
```
const x = writable(0);

x.update(v => v + 1); // increment
x.set(0); // reset back to the default value
```
- Defined in index.ts:918

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