/**
 * Helper functions that have to do with
 * [sets](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set).
 *
 * @module
 */
/**
 * Helper function to add all of the values in one set to another set. The first set passed will be
 * modified in place.
 *
 * This function is variadic, meaning that you can specify N sets to add to the first set.
 */
export declare function addSetsToSet<T>(mainSet: Set<T>, ...setsToAdd: ReadonlyArray<ReadonlySet<T>>): void;
/**
 * Helper function to create a new set that is the composition of two or more sets.
 *
 * This function is variadic, meaning that you can specify N sets.
 */
export declare function combineSets<T>(...sets: ReadonlyArray<ReadonlySet<T>>): ReadonlySet<T>;
/** Helper function to copy a set. (Under the hood, this simply calls the `Set` constructor.) */
export declare function copySet<T>(oldSet: ReadonlySet<T>): ReadonlySet<T>;
/** Helper function to convert the keys of an object to a set. */
export declare function objectKeysToSet<K extends PropertyKey, V>(object: Record<K, V>): ReadonlySet<K>;
/** Helper function to convert the values of an object to a set. */
export declare function objectValuesToSet<K extends PropertyKey, V>(object: Record<K, V>): ReadonlySet<V>;
/**
 * Helper function to add one or more elements to a set at once without having to repeatedly call
 * the `Set.add` method.
 *
 * This function is variadic, meaning that you can pass as many things as you want to add.
 */
export declare function setAdd<T>(set: Set<T>, ...elements: readonly T[]): void;
/**
 * Helper function to check for one or more elements in a set at once without having to repeatedly
 * call the `Set.has` method.
 *
 * This function is variadic, meaning that you can pass as many things as you want to check for. It
 * will return true if one or more elements are found.
 */
export declare function setHas<T>(set: ReadonlySet<T>, ...elements: readonly T[]): boolean;
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