/**
 * Assert that an element exists.
 * @param ui Container element.
 * @throws Error if the element does not exist.
 */
export declare const shouldExist: (ui: HTMLElement) => void;
/**
 * Assert that an element has a specific value.
 * @param ui  Container element.
 * @param value Expected value of the element.
 */
export declare const shouldHaveThisValue: (ui: HTMLElement, value: string) => void;
/**
 * Assert that an element has an empty value.
 * @param ui Container element.
 */
export declare const shouldHaveEmptyValue: (ui: HTMLElement) => void;
/**
 * Assert that an element has a specific CSS class.
 * @param ui Container element.
 * @param text Text of the element.
 * @param expectedClass Expected CSS class.
 */
export declare const shouldHaveClass: (ui: HTMLElement, expectedClass: string) => void;
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