import { WarningMessage } from '../types/transformer';
import { APIRule } from '../types/runner';
/**
 * Generates an unique 22 characters alphanumeric identifier
 * @returns {string}
 */
export declare const generateUID: () => string;
/**
 * Performs a deep merge of `source` into `target`.
 * Mutates `target` only but not its objects and arrays.
 * @param target Target object into which the source object is merged
 * @param source Source object that is merged into the target object
 * @author inspired by [jhildenbiddle](https://stackoverflow.com/a/48218209).
 */
export declare const merge: <T>(target: T, source: T) => T;
/**
 * Returns the warning text message for a given type
 * @param type DOM / Deprecation type of warning message
 * @param usage Code snippet for which the warning message is displayed
 * @returns Warning message
 */
export declare const getWarningText: (type: WarningMessage, usage: string) => string;
/**
 * Filter and split API Compatibility rules based on type
 * @param rules List of API Compatibility rules
 * @param type Type of rule
 */
export declare const filterAPIRules: (rules: APIRule[] | undefined, type: string) => APIRule[][];