# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:603](https://github.com/FilOzone/synapse-sdk/blob/e4bb19e83f9c426be18e2199d205e637240da374/packages/synapse-sdk/src/types.ts#L603)

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