/**
 * Search for a value that match a predicate in a collection, but only return the match if it is the only match in the collection
 * @param collection Array of values
 * @param predicate Predicate function to test the value
 * @returns Matching item if and only if it is the only matching item
 */
export declare function findIfUnique<T>(collection: ArrayLike<T>, predicate: (value: T, index: number, collection: ArrayLike<T>) => boolean): T | undefined;