export declare function polyfillSymbol(root: any): any;
export declare function ensureFor(Symbol: any): void;
export declare function ensureSymbol(root: any): any;
export declare function symbolForPolyfill(key: any): string;
export declare function ensureIterator(Symbol: any, root: any): void;
export declare function ensureObservable(Symbol: any): void;
export declare const SymbolShim: any;