# transformStream

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

Defined in: [packages/synapse-core/src/piece/calculate.ts:103](https://github.com/FilOzone/synapse-sdk/blob/d80afb89df823a5628b86ab0edae21dc95850f82/packages/synapse-core/src/piece/calculate.ts#L103)

## Returns

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