# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:595](https://github.com/FilOzone/synapse-sdk/blob/0c729dad461472f017e4d84f8e6ac16e6afbe7c0/packages/synapse-sdk/src/types.ts#L595)

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