code: function getSelector(Module, selector) {
    // Verify that a base selector is defined.
    if (typeof selector === 'undefined') {
      if (Module.Selectors && Module.Selectors.BASE) {
        return Module.Selectors.BASE;
      }
  
      // Support both `ClassName` and `Classes` enumerations.
      const classes = Module.ClassName || Module.Classes;
      if (classes && classes.BASE) {
        return '.' + classes.BASE;
      }
  
      throw new TypeError('A base selector for this module must be specified.');
    }
  
    return selector;
  }
docs: Determine the base selector for this module.
  @param {Object} Module
  @param {string} [selector]
  @return {string} Updated selector string.
  @throws {TypeError} If the selector cannot be determined.