import { z } from "zod";
export declare const browser_assert: import("@langchain/core/tools").DynamicStructuredTool<z.ZodObject<{
    element: z.ZodString;
    ref: z.ZodString;
    assertion: z.ZodString;
    expected: z.ZodOptional<z.ZodString>;
}, "strip", z.ZodTypeAny, {
    ref: string;
    element: string;
    assertion: string;
    expected?: string | undefined;
}, {
    ref: string;
    element: string;
    assertion: string;
    expected?: string | undefined;
}>>;