# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:466](https://github.com/FilOzone/synapse-sdk/blob/83770aa3b42e40c80326c80cbbbd1c1206c920c0/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.