export declare class Functions {
    static functionToScript(func: (...args: any[]) => void, ...args: any[]): string;
    static toScript(func: (...args: any[]) => void, ...args: any[]): string;
    static _anonymizeFunction(func: string): string;
    static forDict(dict: {
        [key: string]: any;
    }, callback: KeyValueCallback): void;
    static forOwnKeys(dict: {
        [key: string]: any;
    }, callback: KeyValueCallback): Promise<void>;
    static withTimeout(callback: () => any, timeout?: number): void;
    static waitFor(timeout: number): Promise<boolean>;
    static createAsyncSingleton(delegate: () => Promise<void>): () => Promise<void>;
}
export declare type KeyValueCallback = (key: string, value: any) => void;
export declare function forDict(dict: {
    [key: string]: any;
}, callback: KeyValueCallback): void;
export declare function forOwnKeys(dict: {
    [key: string]: any;
}, callback: KeyValueCallback): Promise<void>;
export declare function nullableCallback<T>(delegate: Callback1<T> | undefined): Callback1<T>;
export declare type Callback = () => void;
export declare type Callback1<A> = (value: A) => void;
export declare type Callback2<A, B> = (a: A, b: B) => void;
export declare type Callback3<A, B, C> = (a: A, b: B, c: C) => void;
export declare const NULL_FUNCTION: () => void;
export declare const ASYNC_NULL_FUNCTION: () => Promise<void>;