/**
 * ErrorLike utility interface for containing error-like objects.
 */
type ErrorLike<C = unknown> = Nullable<Partial<Pick<Error, 'stack'>>> & Pick<Error, 'message' | 'name'> & {
    cause?: C;
};
type Nullable<T> = {
    [P in keyof T]: null | T[P];
};
declare const isError: (err: null | undefined | unknown) => err is Error;
declare const isErrorLike: <C = unknown>(err: null | undefined | unknown) => err is ErrorLike<C>;
declare const errorNameFrom: (err: null | undefined | unknown) => string | undefined;
declare const errorMessageFrom: (err: null | undefined | unknown) => string | undefined;
declare const errorStackFrom: (err: null | undefined | unknown) => null | string | undefined;
declare const errorCauseFrom: <C>(err: null | undefined | unknown) => C | undefined;
declare const isErrorEq: (src: null | undefined | unknown, target: null | undefined | unknown) => boolean;
declare const isErrorTypeEq: (src: null | undefined | unknown, target: null | undefined | unknown) => boolean;

export { errorCauseFrom, errorMessageFrom, errorNameFrom, errorStackFrom, isError, isErrorEq, isErrorLike, isErrorTypeEq };
export type { ErrorLike };