/**
 * Get an singleton instance from window/global space
 * if symbol did not exists, create it and assign to window/global
 * @public
 */
export declare function globalSingletonStrong<T>(symbol: symbol | string, constructor: () => T): T;
/**
 * Get an singleton instance from window/global space
 * @public
 */
export declare function globalSingletonStrong<T>(symbol: symbol | string): T | undefined;
/**
 * Delete a key from window/global space
 * use with care
 * @public
 */
export declare function globalSingletonDelete(symbol: symbol | string): void;
/**
 * Same with globalSingletonStrong, but save instance in a WeakMap, so it maybe delete by gc if no reference
 * @public
 */
export declare function globalSingleton<T>(symbol: symbol | string, constructor: () => T): T;
/**
 * Same with globalSingletonStrong, but save instance in a WeakMap, so it maybe delete by gc if no reference
 * @public
 */
export declare function globalSingleton<T>(symbol: symbol | string): T | undefined;
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