/**
 * Trim whitespace from both ends.
 */
export declare function trim(value: string): string;
/**
 * Trim whitespace from the start.
 */
export declare function trimStart(value: string): string;
/**
 * Trim whitespace from the end.
 */
export declare function trimEnd(value: string): string;
/**
 * Convert to lowercase.
 */
export declare function lowercase(value: string): string;
/**
 * Convert to uppercase.
 */
export declare function uppercase(value: string): string;
/**
 * Capitalize the first letter.
 */
export declare function capitalize(value: string): string;
/**
 * Capitalize the first letter of each word.
 */
export declare function titleCase(value: string): string;
/**
 * Convert to camelCase.
 */
export declare function camelCase(value: string): string;
/**
 * Convert to kebab-case.
 */
export declare function kebabCase(value: string): string;
/**
 * Convert to snake_case.
 */
export declare function snakeCase(value: string): string;
/**
 * Strip HTML tags from a string.
 *
 * @example
 * ```ts
 * stripHtml("<p>Hello <b>world</b></p>") // "Hello world"
 * ```
 */
export declare function stripHtml(value: string): string;
/**
 * Escape HTML special characters to prevent XSS.
 *
 * @example
 * ```ts
 * escapeHtml('<script>alert("xss")</script>')
 * // '&lt;script&gt;alert(&quot;xss&quot;)&lt;/script&gt;'
 * ```
 */
export declare function escapeHtml(value: string): string;
/**
 * Unescape HTML entities.
 */
export declare function unescapeHtml(value: string): string;
/**
 * Truncate a string to a maximum length.
 *
 * @example
 * ```ts
 * truncate("Hello, World!", 8)        // "Hello..."
 * truncate("Hello, World!", 8, "…")   // "Hello, …"
 * ```
 */
export declare function truncate(value: string, maxLength: number, suffix?: string): string;
/**
 * Convert a string to a URL-friendly slug.
 *
 * @example
 * ```ts
 * slugify("Hello, World! 🌍")  // "hello-world"
 * slugify("  Foo   BAR  baz ") // "foo-bar-baz"
 * ```
 */
export declare function slugify(value: string): string;
/**
 * Remove all whitespace from a string.
 */
export declare function removeWhitespace(value: string): string;
/**
 * Collapse multiple spaces into a single space.
 */
export declare function collapseWhitespace(value: string): string;
/**
 * Pad a string to a minimum length (left-pads by default).
 */
export declare function padStart(value: string, length: number, fillChar?: string): string;
/**
 * Pad a string to a minimum length (right-pads).
 */
export declare function padEnd(value: string, length: number, fillChar?: string): string;
/**
 * Reverse a string (Unicode-aware).
 */
export declare function reverse(value: string): string;
/**
 * Count occurrences of a substring.
 */
export declare function countOccurrences(value: string, search: string): number;
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