import { Observable } from 'rxjs';
import { DataStoreToken } from './DataStoreToken';
import { MetadataSubjectContext } from './MetadataSubjectContext';
export type ObservedPredicate = Observable<boolean>;
export type Constructor = Function;
export type PredicateIdentifier = string | IMetadataSubject<any>;
export type ConstructorDecorator = (target: Constructor) => void;
export declare const getPredicateMetadata: (constructor: Constructor) => PredicateIdentifier[];
export declare const setPredicateMetadata: (constructor: Constructor, metadata: PredicateIdentifier[]) => void;
export interface IMetadataSubject<T> {
    createObservable(context: MetadataSubjectContext): Observable<T>;
}
export type KeysOf<T> = (keyof T)[];
export type MetadataSubjectAction<T> = (target: Constructor, context: MetadataSubjectContext) => Observable<T>;
export declare function createMetadataDecorator<T>(action: MetadataSubjectAction<T>): ConstructorDecorator;
export declare function createPredicateDecorator<Compartments>(token: DataStoreToken, keys?: KeysOf<Compartments>): ConstructorDecorator;
export declare const waitForCache: typeof createPredicateDecorator;
export declare class PredicateMetadataSubject<Compartments> implements IMetadataSubject<boolean> {
    readonly token: DataStoreToken;
    readonly keys: KeysOf<Compartments>;
    constructor(token: DataStoreToken, keys: KeysOf<Compartments>);
    createObservable(context: MetadataSubjectContext): Observable<boolean>;
}