# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:603](https://github.com/FilOzone/synapse-sdk/blob/7a61a0735ccf4c7d79a729491c35efe758d039cd/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.