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# Interface: UnderlyingSource<R\>

[internal](../modules/internal-8.md).UnderlyingSource

## Type parameters

| Name | Type |
| :------ | :------ |
| `R` | `any` |

## Properties

### cancel

• `Optional` **cancel**: [`UnderlyingSourceCancelCallback`](internal-8.UnderlyingSourceCancelCallback.md)

#### Defined in

packages/medusa-js/node_modules/@types/node/stream/web.d.ts:119

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### pull

• `Optional` **pull**: [`UnderlyingSourcePullCallback`](internal-8.UnderlyingSourcePullCallback.md)<`R`\>

#### Defined in

packages/medusa-js/node_modules/@types/node/stream/web.d.ts:120

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### start

• `Optional` **start**: [`UnderlyingSourceStartCallback`](internal-8.UnderlyingSourceStartCallback.md)<`R`\>

#### Defined in

packages/medusa-js/node_modules/@types/node/stream/web.d.ts:121

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### type

• `Optional` **type**: `undefined`

#### Defined in

packages/medusa-js/node_modules/@types/node/stream/web.d.ts:122