import { IEnumerable } from '../types';
import { EqualityComparer } from '../types';
/**
 * Produces the set union of two sequences.
 * @typeparam TSource The type of source elements.
 * @param src The source Iterable<T>
 * @param second One or more Iterable<T> whose distinct elements form the second set for the union.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function union<TSource>(src: Iterable<TSource>, second: Iterable<TSource>): IEnumerable<TSource>;
/**
 * Produces the set union of two or more sequences.
 * @typeparam TSource The type of source elements.
 * @param src The source Iterable<T>
 * @param second One or more Iterable<T> whose distinct elements form the second set for the union.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function union<TSource>(src: Iterable<TSource>, ...second: Iterable<TSource>[]): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences.
 * @typeparam TSource The type of source elements.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param equalityComparer The EqualityComparer<T> to compare values.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function union<TSource>(src: Iterable<TSource>, second: Iterable<TSource>, equalityComparer: EqualityComparer<TSource>): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences.
 * @typeparam TSource The type of source elements.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param third An IEnumerable<T> whose distinct elements form the third set for the union.
 * @param equalityComparer The EqualityComparer<T> to compare values.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function union<TSource>(src: Iterable<TSource>, second: Iterable<TSource>, third: Iterable<TSource>, equalityComparer: EqualityComparer<TSource>): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences.
 * @typeparam TSource The type of source elements.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param third An IEnumerable<T> whose distinct elements form the third set for the union.
 * @param fourth An IEnumerable<T> whose distinct elements form the fourth set for the union.
 * @param equalityComparer The EqualityComparer<T> to compare values.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function union<TSource>(src: Iterable<TSource>, second: Iterable<TSource>, third: Iterable<TSource>, fourth: Iterable<TSource>, equalityComparer: EqualityComparer<TSource>): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences according to a specified key selector function.
 * @typeparam TSource The type of source elements.
 * @typeparam TKey The type of key to identify elements by.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param keySelector A function to extract the key for each element.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function unionBy<TSource, TKey>(src: Iterable<TSource>, second: Iterable<TSource>, keySelector: (item: TSource) => TKey): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences according to a specified key selector function.
 * @typeparam TSource The type of source elements.
 * @typeparam TKey The type of key to identify elements by.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param third An IEnumerable<T> whose distinct elements form the third set for the union.
 * @param keySelector A function to extract the key for each element.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function unionBy<TSource, TKey>(src: Iterable<TSource>, second: Iterable<TSource>, third: Iterable<TSource>, keySelector: (item: TSource) => TKey): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences according to a specified key selector function.
 * @typeparam TSource The type of source elements.
 * @typeparam TKey The type of key to identify elements by.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param third An IEnumerable<T> whose distinct elements form the third set for the union.
 * @param fourth An IEnumerable<T> whose distinct elements form the fourth set for the union.
 * @param keySelector A function to extract the key for each element.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function unionBy<TSource, TKey>(src: Iterable<TSource>, second: Iterable<TSource>, third: Iterable<TSource>, fourth: Iterable<TSource>, keySelector: (item: TSource) => TKey): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences according to a specified key selector function.
 * @typeparam TSource The type of source elements.
 * @typeparam TKey The type of key to identify elements by.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param keySelector A function to extract the key for each element.
 * @param equalityComparer The EqualityComparer<T> to compare values.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function unionBy<TSource, TKey>(src: Iterable<TSource>, second: Iterable<TSource>, keySelector: (item: TSource) => TKey, equalityComparer: EqualityComparer<TKey>): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences according to a specified key selector function.
 * @typeparam TSource The type of source elements.
 * @typeparam TKey The type of key to identify elements by.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param third An IEnumerable<T> whose distinct elements form the third set for the union.
 * @param keySelector A function to extract the key for each element.
 * @param equalityComparer The EqualityComparer<T> to compare values.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function unionBy<TSource, TKey>(src: Iterable<TSource>, second: Iterable<TSource>, third: Iterable<TSource>, keySelector: (item: TSource) => TKey, equalityComparer: EqualityComparer<TKey>): IEnumerable<TSource>;
/**
 * Produces the set union of two sequences according to a specified key selector function.
 * @typeparam TSource The type of source elements.
 * @typeparam TKey The type of key to identify elements by.
 * @param src The source Iterable<T>
 * @param second An IEnumerable<T> whose distinct elements form the second set for the union.
 * @param third An IEnumerable<T> whose distinct elements form the third set for the union.
 * @param fourth An IEnumerable<T> whose distinct elements form the fourth set for the union.
 * @param keySelector A function to extract the key for each element.
 * @param equalityComparer The EqualityComparer<T> to compare values.
 * @returns An IEnumerable<T> that contains the elements from both input sequences, excluding duplicates.
 */
export declare function unionBy<TSource, TKey>(src: Iterable<TSource>, second: Iterable<TSource>, third: Iterable<TSource>, fourth: Iterable<TSource>, keySelector: (item: TSource) => TKey, equalityComparer: EqualityComparer<TKey>): IEnumerable<TSource>;
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