# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:585](https://github.com/FilOzone/synapse-sdk/blob/8d8b407968f141ea7931036f0f8d36745d1ce74b/packages/synapse-sdk/src/types.ts#L585)

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