import { Type, ProviderOptions, InjectionToken } from './providers';
export declare const INJECTABLE: unique symbol;
export interface InjectableParamMetadata {
    type: Type<any> | InjectionToken<any>;
    optional: boolean;
}
export interface InjectableMetadata {
    params: InjectableParamMetadata[];
    options?: ProviderOptions;
}
export declare function readInjectableMetadata(type: Type<any>, throwOnMissing?: boolean): InjectableMetadata;
export declare function ensureInjectableMetadata(type: Type<any>): void;