/**
 * Represents a callback to determine whether the specified object in the sequence meets certain criteria.
 *
 * @returns a truthy value indicates the item meets the criteria;
 * otherwise, the item does not meet the criteria.
 */
export type IndexedSequenceElementPredicate<T> = (item: T, index: number) => unknown;
export type SequenceElementPredicate<T> = (item: T) => unknown;
/**
 * Represents a callback to determine whether the specified object in the sequence meets certain criteria.
 * This callback also shrinks the type of the input elements by type assertion.
 *
 * @returns a truthy value indicates the item meets the criteria;
 * otherwise, the item does not meet the criteria.
 */
export type SequenceElementTypeAssertionPredicate<T, TReturn extends T> = (item: T, index: number) => item is TReturn;
/**
 * Represents a callback that projects (or maps) the ordered element in a sequence
 * one by one into another sequence of the same length.
 */
export type IndexedSequenceElementSelector<T, TResult> = (item: T, index: number) => TResult;
export type IndexedSequenceElementCallback<T> = (item: T, index: number) => void;
/**
 * Represents a callback that projects (or maps) the unordered element in a sequence
 * one by one into another sequence of the same length.
 */
export type SequenceElementSelector<T, TResult> = (item: T) => TResult;
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