charlike/templates/node_modules/fn-name/index.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('Expected a function');
	}

	return fn.displayName || fn.name || (/function ([^\(]+)?\(/.exec(fn.toString()) || [])[1] || null;
};