/// 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; } }