/**
* Tells whether current environment supports ErrorEvent objects
* {@link supportsErrorEvent}.
*
* @returns Answer to the given question.
*/
export declare function supportsErrorEvent(): boolean;
/**
* Tells whether current environment supports DOMError objects
* {@link supportsDOMError}.
*
* @returns Answer to the given question.
*/
export declare function supportsDOMError(): boolean;
/**
* Tells whether current environment supports DOMException objects
* {@link supportsDOMException}.
*
* @returns Answer to the given question.
*/
export declare function supportsDOMException(): boolean;
/**
* Tells whether current environment supports Fetch API
* {@link supportsFetch}.
*
* @returns Answer to the given question.
*/
export declare function supportsFetch(): boolean;
/**
* isNativeFetch checks if the given function is a native implementation of fetch()
*/
export declare function isNativeFetch(func: Function): boolean;
/**
* Tells whether current environment supports Fetch API natively
* {@link supportsNativeFetch}.
*
* @returns true if `window.fetch` is natively implemented, false otherwise
*/
export declare function supportsNativeFetch(): boolean;
/**
* Tells whether current environment supports ReportingObserver API
* {@link supportsReportingObserver}.
*
* @returns Answer to the given question.
*/
export declare function supportsReportingObserver(): boolean;
/**
* Tells whether current environment supports Referrer Policy API
* {@link supportsReferrerPolicy}.
*
* @returns Answer to the given question.
*/
export declare function supportsReferrerPolicy(): boolean;
/**
* Tells whether current environment supports History API
* {@link supportsHistory}.
*
* @returns Answer to the given question.
*/
export declare function supportsHistory(): boolean;
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