///
declare namespace jest {
interface Matchers {
toBeChecked(): void;
toBeDisabled(): void;
toBeEmpty(): void;
toBePresent(): void;
toContainReact(component: React.ReactElement): void;
toHaveClassName(className: string): void;
toHaveHTML(html: string): void;
toHaveProp(propKey: string, propValue?: any): void;
toHaveRef(refName: string): void;
toHaveState(stateKey: string, stateValue?: any): void;
toHaveStyle(styleKey: string, styleValue?: any): void;
toHaveTagName(tagName: string): void;
toHaveText(text: string): void;
toIncludeText(text: string): void;
toHaveValue(value: any): void;
toMatchElement(element: React.ReactElement): void;
toMatchSelector(selector: string): void;
}
}