svelte-map-reduce-store/group-by.d.ts

```typescript import { MapReduce } from 'svelte-map-reduce-store';

export declare function groupBy<T, U extends boolean>(
  list: T[],
  cb: (item: T) => 'true' | 'false'
): {
  true?: T[];
  false?: T[];
};
export declare function groupBy<T, U extends string>(
  list: T[],
  cb: (item: T) => U
): {
  [category in U]?: T[];
};