# transformStream

> **transformStream**(): [`PieceCIDTransform`](/reference/filoz/synapse-core/piece/interfaces/piececidtransform/)

Defined in: [packages/synapse-core/src/piece/calculate.ts:98](https://github.com/FilOzone/synapse-sdk/blob/1ec76efb13bce0550ca5861a4eb7c441d3fbec9d/packages/synapse-core/src/piece/calculate.ts#L98)

## Returns

[`PieceCIDTransform`](/reference/filoz/synapse-core/piece/interfaces/piececidtransform/)