import { Cls } from './types';
export declare function isFunction(obj: any): obj is Function;
export declare function isClass<T = any>(cls: any): cls is Cls<T>;
/**
 * Returns the string name of an object
 * See https://github.com/angular/angular/blob/2.0.0-rc.4/modules/%40angular/facade/src/lang.ts#L149
 */
export declare function stringify(token: any): string;
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