# PullSource

> **PullSource** = `string` \| ((`pieceCid`) => `string`)

Defined in: [packages/synapse-sdk/src/types.ts:568](https://github.com/FilOzone/synapse-sdk/blob/e084dd50a183619d50e08807fbe28bb727a64077/packages/synapse-sdk/src/types.ts#L568)

Source for pulling pieces from another provider.
Either a base URL string or a function that returns a piece URL for a given PieceCID.