necto/src/utils/is_string.js

Necto compliments Redux by providing a composable, declarative api to create flows through redux (Action -> Reducer or Action -> Saga). The intent of Necto is to reduce boilerplate, simplify and standardize action creators, and group action logic so that

export default st => {
  return !!(
    'undefined' !== st &&
    ('string' === typeof st || st instanceof String)
  );
};