/**
 * Turn a string into a kebab-case string
 * @param inval
 *
 * @example
 *    U.kebabCase('test string') // => 'test-string'
 *    U.kebabCase('testString') // => 'test-string'
 *    U.kebabCase('test_string') // => 'test-string'
 */
export declare function kebabCase(inval: string | null): string;
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