import 'reflect-metadata';
import { Type } from './cli-types';
/**
 * Keys used to describe the metadata for various decorators
 */
export declare enum MetadataKey {
    Command = "CommandMetadata",
    InjectableArgs = "InjectableArgsMetadata",
    Provider = "ProviderMetadata",
    Parameter = "ParameterMetadata",
    Module = "ModuleMetadata",
    Option = "OptionMetadata",
    Options = "OptionsMetadata",
    BeforeExecute = "BeforeExecuteMetadata",
    AfterExecute = "AfterExecuteMetadata",
    DesignParameters = "design:paramtypes"
}
/**
 * Returns metadata on the provided constructor for a particular key
 * @param key Key from the {@link MetadataKey} enum
 * @param target Class constructor
 */
export declare function getMetadata<T = any>(key: MetadataKey, target: Type<any>): T;
/**
 * Adds data to a metadata array for the provided constructor. If no metadata exists, a new array is created with the provided data
 * @param key Key from the {@link MetadataKey} enum
 * @param target Class constructor
 * @param data data to add to the metadata array
 */
export declare function pushMetaData<T = any>(key: MetadataKey, target: Type<any>, data: T): void;
/**
 * Iterates through a metadata array on a constructor and merges the provided data with a matched element if it meets the specified condition.
 * If the specified condition is not found, a new element is added to the end of the array. If no metadata exists on the constructor for the provided
 * key, a new array is attached as the metadata with the provided data.
 * @param key Key from the {@link MetadataKey} enum
 * @param target Class constructor
 * @param where Condition to find an element in the metadata array where the data should be merged
 * @param data Data to add/merge into the metadata array
 */
export declare function mergeMetaData<T = any>(key: MetadataKey, target: Type<any>, where: (item: T) => any, data: T): void;
/**
 * Adds metadata to a constructor for a specified key
 * @param key Key from the {@link MetadataKey} enum
 * @param target Class constructor
 * @param data Metadata to attach
 */
export declare function setMetadata<T = any>(key: MetadataKey, target: Type<any>, data: T): void;
/**
 * Returns whether metadata exists on a constructor for a specified key
 * @param key Key from the {@link MetadataKey} enum
 * @param target Class constructor
 */
export declare function hasMetadata<T>(key: MetadataKey, target: Type<any>): boolean;