[**brk-client**](../README.md) *** [brk-client](../globals.md) / RangeBuilder # Interface: RangeBuilder\ Defined in: [Developer/brk/modules/brk-client/index.js:1024](https://github.com/bitcoinresearchkit/brk/blob/dc15cceb1ee5fd90210add64f487f8d2140ef45a/modules/brk-client/index.js#L1024) ## Type Parameters ### T `T` ## Properties ### fetch() > **fetch**: (`onUpdate?`) => `Promise`\<[`MetricData`](MetricData.md)\<`T`\>\> Defined in: [Developer/brk/modules/brk-client/index.js:1025](https://github.com/bitcoinresearchkit/brk/blob/dc15cceb1ee5fd90210add64f487f8d2140ef45a/modules/brk-client/index.js#L1025) 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:1026](https://github.com/bitcoinresearchkit/brk/blob/dc15cceb1ee5fd90210add64f487f8d2140ef45a/modules/brk-client/index.js#L1026) Fetch as CSV #### Returns `Promise`\<`string`\> *** ### then > **then**: [`Thenable`](../type-aliases/Thenable.md)\<`T`\> Defined in: [Developer/brk/modules/brk-client/index.js:1027](https://github.com/bitcoinresearchkit/brk/blob/dc15cceb1ee5fd90210add64f487f8d2140ef45a/modules/brk-client/index.js#L1027) Thenable