export declare function unicodeCharAt(string: string, index: number): string;
export declare function splitByIndices(text: string, indices: number[], unicodeIndices?: boolean): Map<number, string>;
export declare function replaceRange(str: string, replacement: string, start: number, end: number): string;
export declare function normalizeSlashes(str: string): string;
export declare function isTrueString(str: string): boolean;
export declare function isFalseString(str: string): boolean;
export declare function capitalize(val: string | number): string;