[**brk-client**](../README.md) *** [brk-client](../globals.md) / RangeBuilder # Interface: RangeBuilder\ Defined in: [Developer/brk/modules/brk-client/index.js:1062](https://github.com/bitcoinresearchkit/brk/blob/afe4123a1799221536f346575595e85e3b7040d4/modules/brk-client/index.js#L1062) ## Type Parameters ### T `T` ## Properties ### fetch() > **fetch**: (`onUpdate?`) => `Promise`\<[`MetricData`](MetricData.md)\<`T`\>\> Defined in: [Developer/brk/modules/brk-client/index.js:1063](https://github.com/bitcoinresearchkit/brk/blob/afe4123a1799221536f346575595e85e3b7040d4/modules/brk-client/index.js#L1063) Fetch the range #### Parameters ##### onUpdate? (`value`) => `void` #### Returns `Promise`\<[`MetricData`](MetricData.md)\<`T`\>\> *** ### fetchCsv() > **fetchCsv**: () => `Promise`\<`string`\> Defined in: [Developer/brk/modules/brk-client/index.js:1064](https://github.com/bitcoinresearchkit/brk/blob/afe4123a1799221536f346575595e85e3b7040d4/modules/brk-client/index.js#L1064) Fetch as CSV #### Returns `Promise`\<`string`\> *** ### then > **then**: [`Thenable`](../type-aliases/Thenable.md)\<`T`\> Defined in: [Developer/brk/modules/brk-client/index.js:1065](https://github.com/bitcoinresearchkit/brk/blob/afe4123a1799221536f346575595e85e3b7040d4/modules/brk-client/index.js#L1065) Thenable