//#region src/array/uniq-by.ts
/**
* Returns array with duplicates removed, keeping the LAST occurrence.
* Useful for feature merging where extensions should override base features.
*
* @example
* ```ts
* const features = [{ id: 'a', v: 1 }, { id: 'b', v: 2 }, { id: 'a', v: 3 }];
* uniqBy(features, s => s.id);
* // => [{ id: 'b', v: 2 }, { id: 'a', v: 3 }]
* ```
*/
function uniqBy(arr, mapper) {
	const seen = /* @__PURE__ */ new Map();
	arr.forEach((item, i) => seen.set(mapper(item), i));
	return arr.filter((_, i) => [...seen.values()].includes(i));
}
//#endregion
export { uniqBy };

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