export default class Group {
    readonly value: string;
    readonly start: number | undefined;
    readonly end: number | undefined;
    /**
     * A groups children.
     *
     * There are either one or more children or the attribute is undefined.
     */
    readonly children: readonly Group[] | undefined;
    constructor(value: string, start: number | undefined, end: number | undefined, 
    /**
     * A groups children.
     *
     * There are either one or more children or the attribute is undefined.
     */
    children: readonly Group[] | undefined);
    get values(): string[] | null;
}
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