# RefString.toUpperCase

Convert the current state of a RefString to uppercase.

## Signatures

```ts
export declare const toUpperCase: <E, R>(ref: RefString<E, R>) => RefSubject.Computed<string, E, R>;
```

## Why

Convert the current state of a RefString to uppercase. The operation remains attached to the
RefSubject's versioned state boundary.

## Ownership and lifetime

The to upper case view retains no independent state. An Effect read samples the source once; Fx
observation follows later pushes and its observing Scope owns subscription cleanup.