/**
 * Module for shared loader utils. Rules for this file:
 *
 * - No imports to anything
 * - Keep it small
 * - The utils must be used in lazy/index.ts and lazy/react.tsx
 * - All code must run in IE11 without any polyfills
 */
/**
 * Returns trues when VS should be open
 *
 * @param instanceId
 */
export declare function isSearchActive(instanceId?: string): boolean;
export declare function createEmitter<Args extends any[] = []>(): {
    once(fn: (...args: Args) => any): void;
    emit(...args: Args): void;
};
export declare function assertMainEntryNotLoaded(): void;
export declare function loadPolyfill(cb: () => any, options?: {
    url?: string;
    isModern?: boolean;
}): void;
export declare function isModern(): boolean;
export declare function loadScript(url: string, cb?: VoidFunction): void;