svelte-ux/utils/rollup.d.ts

- Increment version in `package.json` and commit as `Version bump to x.y.z` - `npm run publish`

export default function <T = any>(data: T[], reduce: (items: T[]) => any, keys?: (((d: any) => any) | string | null)[], emptyKey?: string): import("d3-array").InternMap<any, any>;