charlike/templates/node_modules/rechoir/lib/extension.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

const path = require('path');

const EXTRE = /^[.]?[^.]+([.].*)$/;

module.exports = function (input) {
  var extension = EXTRE.exec(path.basename(input));
  if (!extension) {
    return;
  }
  return extension[1];
};