import { ErrorPredicate } from "./error-predicate";
/**
 * Find the first error in the cause chain matching a given predicate or Error
 * constructor.
 *
 * @remarks
 * Normally, the predicate will be invoked with each cause as its first
 * argument. However, if it is an Error constructor, this function will instead
 * find a cause for which `is` returns true for that constructor.
 *
 * @param err - Error instance to search.
 * @param predicate - Predicate function or Error constructor.
 * @returns First matching error, or null if none is found.
 */
export declare function find(err: Error, predicate: ErrorPredicate | Function): Error | null;
/**
 * Find all errors in the cause chain matching a given predicate or Error
 * constructor.
 *
 * @remarks
 * This function is similar to `findCause`, except that it returns an array of
 * *all* matched errors, instead of just the first.
 *
 * @param err - Error instance to search.
 * @param predicate - Predicate function or Error constructor.
 * @returns Array of matching errors.
 */
export declare function filter(err: Error, predicate: ErrorPredicate | Function): Error[];