export declare function todo(msg?: string): never;
export declare function debug(msg?: any): any;
export type EventCallback<E = any> = (event: E) => void;
/**
 * entry的value是否定义了
 *
 * 可以用在Array.filter(isEntryValueDef)中, 用来过滤值为空的元素
 * @see isNotNull
 */
export declare function isEntryValueDef<K, V>(entry: [K, V]): entry is [K, NonNullable<V>];
/**
 * 创建一个异步初始化的单例, 保证只初始化成功一次
 */
export declare function createAsyncSingleton<T>(creator: () => Promise<T>): () => Promise<T>;
/**
 * 简单版的去抖动函数
 * @see https://lodash.com/docs/4.17.21#debounce
 */
export declare function debounce<T extends (...args: any[]) => void>(func: T, wait?: number): (...args: Parameters<T>) => void;
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