/**
 * Get a symbol singleton, if not exists, create it
 *
 * this is very like Symbol.for, but not real global symbol
 * @public
 */
export declare function createSymbol(category: string, name: string): symbol;
/**
 * Delete a symbol from window/global object
 * @public
 */
export declare function deleteSymbol(category: string, name: string): void;
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