export declare function force_cast<T>(x: any): asserts x is T;
export declare function unreachable(x: never, message: string): void;
export declare function show(x: any): string;
export declare function delay(ms: number): Promise<void>;
export declare function cast<T extends Function & {
    prototype: any;
}>(x: any, type: T): T["prototype"];
export declare function maybe_cast<T extends Function & {
    prototype: any;
}>(x: any, type: T): T["prototype"] | null;
export declare type Deferred<T> = {
    resolve: (value: T) => void;
    reject: (reason: any) => void;
    promise: Promise<T>;
};
export declare function defer<T>(): Deferred<T>;
export declare function zip<A, B>(xs: A[], ys: B[]): Generator<[A, B]>;
export declare function zip3<A, B, C>(xs: A[], ys: B[], zs: C[]): Generator<[A, B, C]>;
export declare function every<A>(xs: Iterable<A>, pred: (_: A) => boolean): boolean;
export declare function copy_map<A, B>(source: Map<A, B>, target: Map<A, B>): Map<A, B>;
export declare function clone_map<A, B>(source: Map<A, B>): Map<A, B>;
export declare function gen<A>(x: Iterable<A>): Generator<A, void, undefined>;
export declare function format_time_diff(n: bigint): string;