export declare class UnicodeString {
    utf16: string;
    utf8: Uint8Array;
    private _graphemeLen?;
    constructor(utf16: string);
    get length(): number;
    get graphemeLength(): number;
    slice(start?: number, end?: number): string;
    utf16IndexToUtf8Index(i: number): number;
    toString(): string;
}
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