type DedupeFilterFn<T> = (el: T) => boolean;
type DedupeOptionsBase<T> = {
    /**
     * Pass a custom filter function which will be run in O(n) while deduping is going on
     */
    filter_fn?: DedupeFilterFn<T>;
};
type DedupeOptionsWithKey<T extends Record<string, unknown>> = DedupeOptionsBase<T> & {
    /**
     * Deduplicate based on a single property key of T
     */
    key: keyof T;
};
type DedupeOptionsNoKey<T> = DedupeOptionsBase<T>;
declare function dedupe<T extends Record<string, unknown>>(val: T[], opts: DedupeOptionsWithKey<T>): T[];
declare function dedupe<T>(val: T[], opts?: DedupeOptionsNoKey<T>): T[];
export { dedupe, dedupe as default };