import type { Helper } from "../helper-registry.js";
/**
 * Checks if a collection (array, object, or string) is empty.
 *
 * Inline, subexpression, or block helper that returns true (or the block) if the given collection is empty,
 * or false (or the inverse block, if supplied) if the collection is not empty.
 *
 * Useful in CTRF test reporting for conditionally rendering sections when there are no tests, errors, or results.
 *
 * @example
 * {{#isEmpty test.results}}No results!{{else}}Results found.{{/isEmpty}}
 * <!-- Renders "No results!" if test.results is empty, otherwise "Results found." -->
 *
 * {{isEmpty test.errors}}
 * <!-- Renders true if test.errors is empty, false otherwise -->
 *
 * @param {unknown} collection - The collection (array, object, or string) to check.
 * @param {unknown} [options] - Handlebars options object (for block usage).
 * @returns {boolean|string} True/false for inline/subexpression, or rendered block for block usage.
 *
 * Use this to hide empty test sections, display fallback messages, or control report layout based on data presence.
 */
export declare const isEmptyHelper: Helper;
/**
 * Block helper that iterates over an array or object, exposing each item (and key for objects) to the block.
 *
 * If an array is given, .forEach is called; if an object is given, .forOwn is called; otherwise the inverse block is returned.
 *
 * Useful in CTRF test reporting for iterating over dynamic test results, error maps, or grouped data.
 *
 * @example
 * {{#iterate test.results}}
 *   Test: {{this.name}} - Status: {{this.status}}
 * {{else}}
 *   No test results.
 * {{/iterate}}
 * <!-- Iterates over test.results array, or shows fallback if empty -->
 *
 * {{#iterate test.stats}}
 *   {{@key}}: {{this}}
 * {{/iterate}}
 * <!-- Iterates over object keys/values, e.g. test.stats = { passed: 5, failed: 2 } -->
 *
 * @param {unknown} collection - The collection (array or object) to iterate over.
 * @param {unknown} options - Handlebars options object.
 * @returns {string} Rendered block for each item, or inverse block if not iterable.
 *
 *  Use this to render dynamic tables, lists, or grouped summaries in test reports.
 */
export declare const iterateHelper: Helper;
export declare const collectionsHelpers: Helper[];