# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:466](https://github.com/FilOzone/synapse-sdk/blob/31a254e90d4d78100350c29785cf1a92e6112152/packages/synapse-sdk/src/types.ts#L466)

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