# RefSubject.tuple

Combines multiple `RefSubject`, `Computed`, or `Filtered` instances into a single tuple.

## Signatures

```ts
export declare function tuple<const Refs extends ReadonlyArray<Ref>>(refs: Refs): TupleFrom<Refs>;
```

## Why

Combines several refs into one state value while preserving whether the result is writable,
computed, or filtered from its inputs.

## Ownership and lifetime

This declaration performs no acquisition and retains no resources. Implementations preserve
source errors, services, and lifetime.

## Examples

```ts
import { Effect } from "effect"
import * as RefSubject from "@typed/fx/RefSubject"

const program = Effect.gen(function* () {
  const x = yield* RefSubject.make(10)
  const y = yield* RefSubject.make(20)
  const z = yield* RefSubject.make(30)

  // Combine into a tuple
  const point = RefSubject.tuple([x, y, z])

  const coords = yield* point
  console.log(coords) // [10, 20, 30]

  // Update one value
  yield* RefSubject.set(x, 15)

  // Tuple automatically updates
  const updated = yield* point
  console.log(updated) // [15, 20, 30]
})
```