Function checkClassNamesAreStringOrNull

src/assert.js:17–19

(classNames: any)

 * @param {any} classNames The class names
 */
export function checkClassNamesAreStringOrNull (classNames: any) {
  check(typeof classNames === 'string' || classNames == null, 'classNames must be a string or undefined/null.')
}

/**
 * Asserts the given name is a valid component name.