import { Value } from "./values";
import { Context, RootContext } from "./ctx";
import { Expr, Program } from "./gen_parser";
import { Binder } from "./bind";
export declare class Interpreter {
    global: RootContext;
    binder: Binder;
    private pendingCnt;
    private rejectFn;
    private resolveFn;
    private execPromise;
    constructor(tps?: number, externals?: (ctx: Context) => [string, Value][]);
    stop(): void;
    inject(p: () => Promise<void>): void;
    interpret(p: Program, stopOnErr?: boolean): Promise<void>;
    evalExpr(expr: Expr): Promise<Value>;
}