export declare class LexerUtil {
    static isIdentifierStart(ch: number): boolean;
    static isIdentifierRest(ch: number): boolean;
    static isNotIdentifierStart(ch: number): boolean;
    static isNumberLiteralStart(ch: number): boolean;
    static isStringLiteralStart(ch: number): boolean;
    static isNotEOL(ch: number): boolean;
    static isWhiteSpace(ch: number): boolean;
    static isDigit(ch: number): boolean;
    static toPrintable(ch: number): string;
    static isHexDigit(ch: number): boolean;
    private static isAlpha;
    static processStringContent(content: string): string;
}
export declare class ScopedSet<T> {
    private parent;
    private scope;
    constructor(parent: ScopedSet<T> | null, scope: Set<T>);
    static create<T>(): ScopedSet<T>;
    enter(): ScopedSet<T>;
    leave(): ScopedSet<T>;
    addTopScope(item: T): ScopedSet<T>;
    getScope(): Set<T>;
    contains(item: T): boolean;
    addAll(items: T[]): void;
}
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