export declare const LENGTH: (val: string | unknown[]) => number;
export declare const IS_EMPTY: (val: string | unknown[]) => boolean;
export declare const IS_NOT_EMPTY: (val: string | unknown[]) => boolean;
export declare const CONTAINS: (val: string | unknown[], searchString: string) => boolean;
export declare const INDEX_OF: (val: string | unknown[], searchString: string) => number;
export declare const LAST_INDEX_OF: (val: string | unknown[], searchString: string) => number;
export declare const REVERSE: (val: string | unknown[]) => string | unknown[];
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