# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:545](https://github.com/FilOzone/synapse-sdk/blob/230d5bed149aa2c1579843ad4014670953652cf7/packages/synapse-sdk/src/types.ts#L545)

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