export type CatchMatcher = number | number[] | string | ((error: unknown) => boolean);
export interface CatchablePromise<T> extends Promise<T> {
	/**
	* Recover from specific errors. Matcher can be a status code, an array of
	* status codes, an error class name (string), or a predicate.
	*
	* Returning a value resolves the promise; throwing propagates a new error.
	*/
	onError: <U = T>(matcher: CatchMatcher, handler: (error: Error) => U | Promise<U>) => CatchablePromise<T | U>;
}
export declare function catchable<T>(promise: Promise<T>): CatchablePromise<T>;
export declare function matchesMatcher(matcher: CatchMatcher, error: unknown): boolean;