is-gen-fn/index.js

determine if a function is a generator function

/**
 * Expose `isGeneratorFunction`
 */

module.exports = isGeneratorFunction;

/**
 * Check if `obj` is a generator function.
 *
 * @param {Mixed} obj
 * @return {Boolean}
 * @api private
 */

function isGeneratorFunction(obj) {
  return obj && obj.constructor && 'GeneratorFunction' == obj.constructor.name;
}