denoland-deno/cli/tsc/dts/lib.esnext.object.d.ts

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/// <reference no-default-lib="true"/>

// NOTE(iuioiua): taken from https://github.com/microsoft/TypeScript/issues/47171#issuecomment-1697373352
// while we wait for these types to officially ship
interface ObjectConstructor {
  groupBy<Item, Key extends PropertyKey>(
    items: Iterable<Item>,
    keySelector: (item: Item, index: number) => Key,
  ): Partial<Record<Key, Item[]>>;
}

interface MapConstructor {
  groupBy<Item, Key>(
    items: Iterable<Item>,
    keySelector: (item: Item, index: number) => Key,
  ): Map<Key, Item[]>;
}