import type { JSValueHandle, QuickJS } from "quickjs-wasi";
import type { NotebookHook } from "../code-mode/types.ts";
export declare const JS_SUPPORT_SOURCE: string;
export declare class JsSupport {
    readonly token: number;
    private readonly vm;
    constructor(vm: QuickJS, token?: number);
    call(name: string, ...args: JSValueHandle[]): JSValueHandle;
    identity(value: JSValueHandle, suppliedId?: string): string;
    isExtensible(value: JSValueHandle): boolean;
    register(name: string, event: NotebookHook | false, fn: JSValueHandle): void;
}