/**
 * A simple utility class for translating data between objects and intermediary representations.
 * The most obvious use cases are unpacking a DTO into a class instance, or merging multiple DTOs into a complex model.
 * Mostly this class is a structured way of avoiding the endless repetition of "if x.hasOwnProperty( x )".
 */
export declare class AlMergeHelper {
    source: any;
    target: any;
    constructor(source: any, target: any);
    /**
     * Copies one or more properties from the source into the target.
     */
    copy(...sourceProperties: string[]): void;
    /**
     * Copies a property from the source to a different property name in the target.
     */
    rename(sourceProperty: string, targetProperty: string): void;
    /**
     * Copies an array of properties from source to a different property name in the target.
     */
    renameAll(...properties: [string, string][]): void;
    /**
     * Transforms a property from the source into a new property in the target.
     */
    transform(sourceProperty: string, targetProperty: string, transformer: {
        (input: unknown): any;
    }): void;
    /**
     * Executes a callback against a property in the source object.
     */
    with<PropertyType = any>(sourceProperty: string, action: {
        (value: PropertyType): void;
    }): void;
    /**
     * Creates a child merge helper that targets a child property.
     */
    descend(sourceProperty: string, targetProperty: string | null, action: {
        (merger: AlMergeHelper): void;
    }): void;
}