/**
 * Generic constructor type used for dependency registration and injection.
 * Represents any class constructor that can be used with the DI container.
 *
 * @template T - The type of object the constructor creates
 *
 * @example
 * // Use with service registration
 * class UserService {}
 * const ctor: Constructor<UserService> = UserService;
 * serviceCollection.registerByType(ctor, { inject: [] });
 */
export type Constructor<T extends object = object> = new (...args: any[]) => T;
/**
 * Controls how service instances are shared across the container hierarchy.
 * Used when registering services to define their lifetime behavior.
 *
 * - `global`: Single instance shared everywhere (singleton pattern)
 * - `closest`: New instance per container scope (scoped lifetime)
 *
 * @example
 * // Singleton service - same instance everywhere
 * serviceCollection.register(LoggerService, { scope: 'global', inject: [] });
 *
 * // Scoped service - new instance per scope
 * serviceCollection.register(RequestContext, { scope: 'closest', inject: [] });
 */
export type ServiceScope = 'global' | 'closest';
/**
 * Configuration options for registering a service in the DI container.
 * Controls identification, lifetime, and dependency resolution.
 *
 * @example
 * // Register with constructor injection
 * const options: RegistrationOptions = {
 *     scope: 'global',
 *     inject: [DatabaseConnection, ConfigService]
 * };
 * serviceCollection.register(UserRepository, options);
 *
 * @example
 * // Register with property injection
 * const options: RegistrationOptions = {
 *     inject: [],
 *     properties: { logger: Logger, config: 'appConfig' }
 * };
 *
 * @example
 * // Register with a pre-created instance
 * const options: RegistrationOptions = {
 *     inject: [],
 *     instance: existingService
 * };
 */
export interface RegistrationOptions {
    /** Service lifetime - 'global' for singleton, 'closest' for scoped */
    scope?: ServiceScope;
    /** Optional string key for resolving by name instead of type */
    key?: string;
    /** Pre-existing instance to use instead of creating new one */
    instance?: unknown;
    /** Types or keys for constructor parameters, in order */
    inject: (string | Constructor)[];
    /** Map of property names to their injection types/keys */
    properties?: Record<string, string | Constructor>;
}
/**
 * Field decorator that collects property injection configuration.
 * Updates or creates the properties mapping in registration options.
 *
 * @example
 * @ContainerService({
 *   inject: [Database],
 *   properties: {
 *     logger: Logger,        // Inject by type
 *     audit: 'auditLogger'   // Inject by key
 *   }
 * })
 * class UserService {
 *   @Inject(Logger)
 *   private logger!: Logger;
 *
 *   @Inject('auditLogger')
 *   private audit!: Logger;
 *
 *   constructor(db: Database) {}
 * }
 */
export declare function Inject<T extends object>(typeOrKey: Constructor<T> | string): (_: undefined, context: ClassFieldDecoratorContext) => (this: any) => T;
/**
 * Class decorator that automatically registers a service in the global DI container.
 * Use this to declaratively register services without manual registration calls.
 *
 * Services are registered at module load time, so ensure this file is imported
 * before attempting to resolve the decorated service.
 *
 * @param options - Registration configuration including scope and dependencies
 *
 * @example
 * // Simple service with constructor injection
 * @ContainerService({ inject: [DatabaseConnection] })
 * class UserRepository {
 *     constructor(private db: DatabaseConnection) {}
 * }
 *
 * @example
 * // Service with custom key for named resolution
 * @ContainerService({ key: 'primaryCache', scope: 'global', inject: [] })
 * class CacheService {}
 *
 * // Later resolve by key
 * const cache = container.resolve('primaryCache');
 */
export declare function ContainerService<T extends object>(options?: RegistrationOptions): (target: Constructor<T>) => void;
/**
 * Internal class representing a registered service's metadata.
 * Holds all information needed to create and configure service instances.
 *
 * @internal This is an implementation detail and should not be used directly.
 */
declare class Registration {
    classConstructor: Constructor;
    scope: ServiceScope;
    inject: (string | Constructor)[];
    properties: Record<string, string | Constructor>;
    key?: string;
    instance?: unknown;
    /**
     * Creates a new registration record.
     *
     * @param classConstructor - The class constructor function
     * @param scope - Instance sharing behavior
     * @param inject - Constructor parameter dependencies
     * @param properties - Property injection mappings
     * @param key - Optional string identifier
     * @param instance - Optional pre-created instance
     */
    constructor(classConstructor: Constructor, scope: ServiceScope, inject: (string | Constructor)[], properties?: Record<string, string | Constructor>, key?: string, instance?: unknown);
}
/**
 * Registry that stores service registration metadata.
 * Use this to register services before they can be resolved by a ServiceContainer.
 *
 * Typically you'll use the global `serviceCollection` instance rather than creating your own.
 *
 * @example
 * // Register a service by type
 * serviceCollection.registerByType(LoggerService, { inject: [] });
 *
 * // Register with a string key
 * serviceCollection.register(CacheService, { key: 'cache', inject: [] });
 *
 * // Check if service is registered
 * const reg = serviceCollection.tryGet(LoggerService);
 * if (reg) {
 *     console.log('Logger is registered');
 * }
 */
export declare class ServiceCollection {
    private servicesByKey;
    private servicesByClassName;
    /**
     * Registers a service with full configuration options.
     * The service will be resolvable by both its class name and optional key.
     *
     * @param constructor - The service class constructor
     * @param options - Registration configuration
     */
    register<T extends object>(constructor: Constructor<T>, options: RegistrationOptions): void;
    /**
     * Registers a service by its class type.
     * The service will be resolvable by its class constructor.
     *
     * @param constructor - The service class constructor
     * @param options - Optional registration configuration
     */
    registerByType<T extends object>(constructor: Constructor<T>, options?: RegistrationOptions): void;
    private checkNameCollision;
    private validateRegistration;
    /**
     * Attempts to retrieve a service registration.
     * Returns undefined if the service is not registered.
     *
     * @param key - Either a string key or class constructor
     * @returns The registration or undefined
     */
    tryGet<T extends object>(key: string | Constructor<T>): Registration | undefined;
    /**
     * Retrieves a service registration or throws if not found.
     *
     * @param key - Either a string key or class constructor
     * @returns The registration
     * @throws Error if the service is not registered
     */
    get<T extends object>(key: string | Constructor<T>): Registration;
}
/**
 * IoC container that resolves and manages service instances.
 * Creates instances based on registrations in a ServiceCollection,
 * handling constructor injection, property injection, and lifetime management.
 *
 * Typically you'll use the global `container` instance rather than creating your own.
 *
 * @example
 * // Resolve a service by class
 * const logger = container.resolve(LoggerService);
 *
 * // Resolve by string key
 * const cache = container.resolve<CacheService>('primaryCache');
 *
 * @example
 * // Full setup workflow
 * serviceCollection.register(UserService, {
 *     inject: [DatabaseConnection],
 *     scope: 'global'
 * });
 *
 * const userService = container.resolve(UserService);
 */
export declare class ServiceContainer {
    private serviceCollection;
    private instances;
    /**
     * Creates a new container backed by the given service collection.
     *
     * @param serviceCollection - The registry containing service registrations
     */
    constructor(serviceCollection: ServiceCollection);
    /**
     * Resolves a service instance by class type or string key.
     * Creates the instance if not already cached (for global scope).
     * Handles constructor and property injection automatically.
     *
     * @param keyOrType - Either a string key or class constructor
     * @returns The resolved service instance
     * @throws Error if the service is not registered
     *
     * @example
     * const service = container.resolve(MyService);
     */
    resolve<T extends object>(keyOrType: string | Constructor<T>): T;
    /**
     * Creates a new instance of a service, resolving all constructor dependencies.
     */
    private createInstance;
    /**
     * Injects dependencies into instance properties based on registration config.
     */
    private injectFields;
}
/**
 * Global service collection instance for registering services.
 * Use this to register services that can later be resolved by the container.
 *
 * @example
 * import { serviceCollection } from 'relaxjs';
 *
 * serviceCollection.register(MyService, { inject: [Dependency] });
 */
export declare const serviceCollection: ServiceCollection;
/**
 * Global service container instance for resolving dependencies.
 * Use this to obtain service instances with all dependencies injected.
 *
 * @example
 * import { container } from 'relaxjs';
 *
 * const service = container.resolve(MyService);
 */
export declare const container: ServiceContainer;
export {};