function getChecker(name) {
  return checkersMap[name] || isPascalCase
}
Return case checker
@param { 'camelCase' | 'kebab-case' | 'PascalCase' | 'snake_case' } name type of checker to return ('camelCase', 'kebab-case', 'PascalCase')
@return {isKebabCase|isCamelCase|isPascalCase|isSnakeCase}