/**
 * @file Validator for modifiers.
 */
import { type Modifier } from '../nodes/index.js';
import { AdblockSyntax } from '../utils/adblockers.js';
import { type ValidationResult } from './helpers.js';
/**
 * Modifier validator class.
 */
declare class ModifierValidator {
    /**
     * Simply checks whether the modifier exists in any adblocker.
     *
     * **Deprecated** and **removed** modifiers are considered as **existent**.
     *
     * @param modifier Already parsed modifier AST node.
     *
     * @returns True if modifier exists, false otherwise.
     */
    exists: (modifier: Modifier) => boolean;
    /**
     * Checks whether the given `modifier` is valid for specified `syntax`.
     *
     * For `Common` syntax it simply checks whether the modifier exists.
     * For specific syntax the validation is more complex —
     * deprecated, assignable, negatable and other requirements are checked.
     *
     * @param syntax Adblock syntax to check the modifier for.
     * @param rawModifier Modifier AST node.
     * @param isException Whether the modifier is used in exception rule, default to false.
     * Needed to check whether the modifier is allowed only in blocking or exception rules.
     *
     * @returns Result of modifier validation.
     */
    validate: (syntax: AdblockSyntax, rawModifier: Modifier, isException?: boolean) => ValidationResult;
}
export declare const modifierValidator: ModifierValidator;
export {};