import type { Main } from '../index.js';
/**
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*/
export declare const testSymbol: unique symbol;
/**
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*/
export declare const optionalSymbol: unique symbol;
/**
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*/
export declare const nullableSymbol: unique symbol;
/**
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*/
export declare const absentSymbol: unique symbol;
/**
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*/
export declare const isPredicate: (value: unknown) => value is BasePredicate;
/**
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*/
export type BasePredicate<T = unknown> = {
    [optionalSymbol]?: boolean;
    [nullableSymbol]?: boolean;
    [absentSymbol]?: boolean;
    [testSymbol](value: T, main: Main, label: string | Function, idLabel?: boolean): void;
};