astexplorer.json

{
  "v": 2,
  "parserID": "typescript",
  "toolID": "jscodeshift",
  "settings": {
    "typescript": {}
  },
  "versions": {
    "typescript": "2.6.1",
    "jscodeshift": "0.3.32"
  }
}

source.js

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { HomePage } from '../home/home';
import { FormGroup, FormControl, Validators } from '@angular/forms';
import { UserProvider } from '../../providers/user/user';
import 'rxjs/add/operator/finally';
import { LoginPage } from '../index';

@Component({
  selector: 'page-signup',
  templateUrl: 'signup.html'
})
export class SignupPage {
  signupForm: FormGroup;
  loading: boolean;

  constructor(public navCtrl: NavController, private userProvider: UserProvider) {
    this.signupForm = new FormGroup({
      username: new FormControl('', [ Validators.required ]),
      email: new FormControl('', [ Validators.required, Validators.email ]),
      password: new FormControl('', [ Validators.required ])
    });
  }

  signup() {
    if (this.signupForm.valid) {
      this.userProvider.signup(this.signupForm.value)
      .finally(() => this.loading = false)
      .subscribe(response => {
        if (response["status"] === "success") {
          this.gotoHome();
        }
      }, err => {
        // console.log("err", err);
      });
    } else {
      this.userProvider.presentToast('Please fill the form correctly');
    }
  }

  gotoHome() {
    this.navCtrl.setRoot(HomePage);
  }

  gotoLogin() {
    this.navCtrl.setRoot(LoginPage);
  }
}

transform.js

// Press ctrl+space for code completion
export default function transformer(file, api) {
  const j = api.jscodeshift;

  return j(file.source)
    .find(j.Identifier)
    .forEach(path => {
      j(path).replaceWith(
        j.identifier(path.node.name.split('').reverse().join(''))
      );
    })
    .toSource();
}