Converts arrow functions, mistakely used for controllers, factories and services, to normal function expressions. Example usage http://astexplorer.net/#/4JAWwc4Jmf/1

angular-arrows-to-fns.js

//Usage: jscodeshift -t angular-arrows-to-fns.js <pathes to files>

var THING_TO_REPLACE = 'controller';

module.exports = (file, api, options) => {
  const j = api.jscodeshift;

  const root = j(file.source);

  return root
    .find(j.ArrowFunctionExpression)
    .filter(path => {
      const isArgument = path.parentPath.name === 'arguments' && path.parentPath.value.indexOf(path.value) > -1;
      if (!isArgument) {
        return false;
      }

      const caller = path.parentPath
        && path.parentPath.parentPath
        && path.parentPath.parentPath.value.callee
        && path.parentPath.parentPath.value.callee.property
        && path.parentPath.parentPath.value.callee.property.name;

      const isArgumentOfAngularStuff = path.parentPath.value[0].type === "Literal"
        && path.parentPath.value[1].type === "ArrowFunctionExpression"
        && caller === THING_TO_REPLACE;

      return isArgument && isArgumentOfAngularStuff;
    })
    .replaceWith(p => {
      var body = p.value.body;

      if (body.type !== 'BlockStatement') {
        body = j.blockStatement([j.returnStatement(body)]);
      }

      //console.log(p.value.params)

      return j.functionExpression(j.identifier(THING_TO_REPLACE), p.value.params, body);
    }).
    toSource();
};