# PullSource

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

Defined in: [packages/synapse-sdk/src/types.ts:619](https://github.com/FilOzone/synapse-sdk/blob/d80afb89df823a5628b86ab0edae21dc95850f82/packages/synapse-sdk/src/types.ts#L619)

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