/**
 * Converts a camelized string into all lower case separated by underscores.
 *
 * ```javascript
 * decamelize('innerHTML');         // 'inner_html'
 * decamelize('action_name');       // 'action_name'
 * decamelize('css-class-name');    // 'css-class-name'
 * decamelize('my favorite items'); // 'my favorite items'
 * ```
 * @method decamelize
 * @param str The string to decamelize.
 * @return the decamelized string.
 */
export declare function decamelize(str: string): string;
/**
 * Replaces underscores, spaces, or camelCase with dashes.
 * ```javascript
 * dasherize('innerHTML');         // 'inner-html'
 * dasherize('action_name');       // 'action-name'
 * dasherize('css-class-name');    // 'css-class-name'
 * dasherize('my favorite items'); // 'my-favorite-items'
 * ```
 * @method dasherize
 * @param str The string to dasherize.
 * @return the dasherized string.
 */
export declare function dasherize(str: string): string;
/**
 * Returns the lowerCamelCase form of a string.
 * ```javascript
 * camelize('innerHTML');          // 'innerHTML'
 * camelize('action_name');        // 'actionName'
 * camelize('css-class-name');     // 'cssClassName'
 * camelize('my favorite items');  // 'myFavoriteItems'
 * camelize('My Favorite Items');  // 'myFavoriteItems'
 * ```
 * @method camelize
 * @param str The string to camelize.
 * @return the camelized string.
 */
export declare function camelize(str: string): string;
/**
 * Returns the UpperCamelCase form of a string.
 * ```javascript
 * 'innerHTML'.classify();          // 'InnerHTML'
 * 'action_name'.classify();        // 'ActionName'
 * 'css-class-name'.classify();     // 'CssClassName'
 * 'my favorite items'.classify();  // 'MyFavoriteItems'
 * ```
 * @method classify
 * @param str the string to classify
 * @return the classified string
 */
export declare function classify(str: string): string;
/**
 * More general than decamelize. Returns the lower\_case\_and\_underscored
 * form of a string.
 * ```javascript
 * 'innerHTML'.underscore();          // 'inner_html'
 * 'action_name'.underscore();        // 'action_name'
 * 'css-class-name'.underscore();     // 'css_class_name'
 * 'my favorite items'.underscore();  // 'my_favorite_items'
 * ```
 * @method underscore
 * @param str The string to underscore.
 * @return the underscored string.
 */
export declare function underscore(str: string): string;
/**
 * Returns the Capitalized form of a string
 * ```javascript
 * 'innerHTML'.capitalize()         // 'InnerHTML'
 * 'action_name'.capitalize()       // 'Action_name'
 * 'css-class-name'.capitalize()    // 'Css-class-name'
 * 'my favorite items'.capitalize() // 'My favorite items'
 * ```
 * @method capitalize
 * @param str The string to capitalize.
 * @return The capitalized string.
 */
export declare function capitalize(str: string): string;
/**
 * Calculate the levenshtein distance of two strings.
 * See https://en.wikipedia.org/wiki/Levenshtein_distance.
 * Based off https://gist.github.com/andrei-m/982927 (for using the faster dynamic programming
 * version).
 *
 * @param a String a.
 * @param b String b.
 * @returns A number that represents the distance between the two strings. The greater the number
 *   the more distant the strings are from each others.
 */
export declare function levenshtein(a: string, b: string): number;