# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:611](https://github.com/FilOzone/synapse-sdk/blob/e6f98e0893630331d71bd26db21fbed48b888b48/packages/synapse-sdk/src/types.ts#L611)

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