Function readable

readable<T>(value, options?): ReadableSignal<T>
A convenience function to create Readable store instances.
Type Parameters
- T
Parameters
- value: T
  Initial value of a readable 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 ReadableSignal<T>
Example: Sample with an onUse function
```
const clock = readable("00:00", setState => {
  const intervalID = setInterval(() => {
    const date = new Date();
    setState(`${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`);
  }, 1000);

  return () => clearInterval(intervalID);
});
```
- Defined in index.ts:886

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