/**
 * Copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
export declare class InvalidSelectorError extends Error {
}
export declare function isInvalidSelectorError(error: Error): error is InvalidSelectorError;
type ClauseCombinator = '' | '>' | '+' | '~' | '>=';
export type CSSFunctionArgument = CSSComplexSelector | number | string;
export type CSSFunction = {
    name: string;
    args: CSSFunctionArgument[];
};
export type CSSSimpleSelector = {
    css?: string;
    functions: CSSFunction[];
};
export type CSSComplexSelector = {
    simples: {
        selector: CSSSimpleSelector;
        combinator: ClauseCombinator;
    }[];
};
export type CSSComplexSelectorList = CSSComplexSelector[];
export declare function parseCSS(selector: string, customNames: Set<string>): {
    selector: CSSComplexSelectorList;
    names: string[];
};
export declare function serializeSelector(args: CSSFunctionArgument[]): string;
export {};
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