codemod for replacing commonjs with es6 import/export

es6.js

const requireRegex = new RegExp(/(?:var|let|const)?\s*([^\s]+)?(\s*=\s*)?require\s*\(['"](.+)['"]\)[;,]?/, 'g');
const importReplace = "import $1 from '$3';";

const exportsRegex = new RegExp(/module.exports\s*=\s*/, 'g');
const exportReplace = "export default ";


const importMissingVariable = new RegExp(/import\s*from\s*'/, 'g');
const replaceMissingVariable = "import '";

const requireOrExportsRegex = new RegExp(/[require|exports]/);
function shouldReplace(text){
  return requireOrExportsRegex.test(text);
}

module.exports = function transformer(file, api) {
  let src = file.source;
  
  try {
    if(!shouldReplace(src)){
      return src;
    }
      
    src = src.replace(requireRegex, importReplace)
      .replace(exportsRegex, exportReplace)
      .replace(importMissingVariable, replaceMissingVariable)
          
  } catch(e) {
    console.error(e);
  }
  
  return src;
};