charlike/templates/node_modules/es5-ext/object/valid-callable.js

Small, fast, simple and streaming project scaffolder for myself, but not only. Supports hundreds of template engines through the @JSTransformers API or if you want custom `render` function passed through options

'use strict';

module.exports = function (fn) {
	if (typeof fn !== 'function') throw new TypeError(fn + " is not a function");
	return fn;
};