SyntaxError: Unexpected token '<' when running Jest

[GiaHuy216]

Describe the bug

I'm using ignite to create an expo react native app. I'm using this guide https://ignitecookbook.com/docs/recipes/GeneratorComponentTests to create component test files

Here is the first test file

import React from "react"
import { fireEvent, render, screen } from "@testing-library/react-native"
import { Profile } from "../Profile"

describe("Profile", () => {
  it("renders", () => {
    render(<Profile />)
    expect(screen.getByText("Hello")).toBeTruthy()
  })
})

I followed https://reactnativetesting.io/component/setup/ in order to install @testing-library/react-native but now I'm getting

 ● Test suite failed to run

    Jest encountered an unexpected token

    Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

    Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

    By default "node_modules" folder is ignored by transformers.

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
     • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/configuration
    For information about custom transformations, see:
    https://jestjs.io/docs/code-transformation

    Details:

    /Users/giahuy/PizzaApp/app/components/specs/Profile.spec.tsx:12
            (0, react_native_1.render)(<Profile_1.Profile />);
                                       ^

    SyntaxError: Unexpected token '<'

Here my jest.config.js

const { defaults: tsjPreset } = require("ts-jest/presets")

/** @type {import('@jest/types').Config.ProjectConfig} */
module.exports = {
  ...tsjPreset,
  preset: "react-native",
  transformIgnorePatterns: [
    "<rootDir>/node_modules/(react-clone-referenced-element|@react-native-community|react-navigation|@react-navigation/.*|@unimodules/.*|native-base|react-native-code-push)",
    "jest-runner",
  ],
  testPathIgnorePatterns: ["<rootDir>/node_modules/", "<rootDir>/.maestro/", "@react-native"],
  testEnvironment: "jsdom",
  setupFiles: ["<rootDir>/test/setup.ts"],
  transform: {
    "^.+\\.spec.tsx?$": [
      "ts-jest",
      {
        tsconfig: "<rootDir>/test/test-tsconfig.json",
      },
    ],
  },
}

how can I fix it ??

Ignite version

9.3.1

Additional info

System
  platform           darwin                              
  arch               arm64                               
  cpu                8 cores      Apple M2               
  directory          PizzaApp     /Users/giahuy/PizzaApp 

JavaScript (and globally-installed packages)
  node               18.18.2      /Users/giahuy/.nvm/versions/node/v18.18.2/bin/node 
  npm                9.8.1        /Users/giahuy/.nvm/versions/node/v18.18.2/bin/npm  
    corepack         0.19.0                                                          
    npm              9.8.1                                                           
  yarn               1.22.21      /opt/homebrew/bin/yarn                             
    create-jest      29.7.0                                                          
  pnpm               -            not installed                                      
  bun                -            not installed                                      
  expo               49.0.21      managed                                            

Ignite
  ignite-cli         9.3.1        /Users/giahuy/.npm/_npx/e31027f3785124a8/node_modules/.bin/ignite      
  ignite src         build        /Users/giahuy/.npm/_npx/e31027f3785124a8/node_modules/ignite-cli/build 

Android
  java               17.0.9       /usr/bin/java                     
  android home       -            /Users/giahuy/Library/Android/sdk 

iOS
  xcode              15.1       
  cocoapods          1.14.3       /opt/homebrew/bin/pod 

Tools
  git                git version 2.39.3 (Apple Git-145)   /usr/bin/git 

[frankcalise]

Hi @GiaHuy216

I couldn't reproduce that error exactly, but had run into the test just never completing until I removed testEnvironment: "jsdom" from the jest config. Then the test provided worked as is.

Could you paste your Profile component here as well?

[markrickert]

This also might happen if you file is named .js or .ts instead of .jsx/.tsx. The "X" in the file name indicated that the compiler should expect XML in the javascript

[GiaHuy216]

@frankcalise Here is Profile component

import * as React from "react"
import { StyleProp, TextStyle, View, ViewStyle } from "react-native"
import { observer } from "mobx-react-lite"
import { colors, typography } from "app/theme"
import { Text } from "app/components/Text"

export interface ProfileProps {
  /**
   * An optional style override useful for padding & margin.
   */
  style?: StyleProp<ViewStyle>
}

/**
 * Describe your component here
 */
export const Profile = observer(function Profile(props: ProfileProps) {
  const { style } = props
  const $styles = [$container, style]

  return (
    <View style={$styles}>
      <Text style={$text}>Hello</Text>
    </View>
  )
})

const $container: ViewStyle = {
  justifyContent: "center",
}

const $text: TextStyle = {
  fontFamily: typography.primary.normal,
  fontSize: 14,
  color: colors.palette.primary500,
}

I also removed testEnvironment: "jsdom" like you said but it doesn't work .Did i miss something?

[GiaHuy216]

@markrickert My component file and test file are both tsx files.

[3210jr]

@GiaHuy216 - I just got my tests to work again, had to remove: testEnvironment: "jsdom", as suggested by @frankcalise and then replaced the transform, here is what I have now as my jest.config.js (including commented out code):

const { defaults: tsjPreset } = require("ts-jest/presets")

/** @type {import('@jest/types').Config.ProjectConfig} */
module.exports = {
  ...tsjPreset,
  preset: "jest-expo",
  transformIgnorePatterns: [
    "<rootDir>/node_modules/(react-clone-referenced-element|@react-native-community|react-navigation|@react-navigation/.*|@unimodules/.*|native-base|react-native-code-push)",
    "jest-runner",
  ],
  testPathIgnorePatterns: ["<rootDir>/node_modules/", "<rootDir>/.maestro/", "@react-native", "<rootDir>/test/i18n.test.ts"],
  // testEnvironment: "jsdom",
  setupFiles: ["<rootDir>/test/setup.ts"],
  "setupFilesAfterEnv": [
    "@testing-library/jest-native/extend-expect"
  ],
  coverageDirectory: "<rootDir>/test/coverage",
  collectCoverageFrom: [
    "**/*.{js,jsx,ts,tsx}",
    "!**/node_modules/**",
    "!**/vendor/**",
    "!**/test/**",
    "!**/coverage/**",
    "!**/.expo/**",
    "!**/android/**",
    "!**/ios/**",
  ],
  // moduleNameMapper: {
  //   "app/(.*)": "<rootDir>/app/$1",
  // },
  transform:{
    // '^.+\\.test.tsx?$': ['ts-jest', {
      // tsconfig: '<rootDir>/test/test-tsconfig.json'
    // }],
    "^.+\\.[jt]sx?$": "babel-jest",
  },
  moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
  "globals": {
    "ts-jest": {
      "diagnostics": false
    }
  }
}

Let me know if this works, or causes other issues I haven't come across yet

[frankcalise]

@3210jr thanks for confirming it's working. it also aligns with what I found here on RNTL's issue board: https://github.com/callstack/react-native-testing-library/issues/896#issuecomment-1165384492

Will make that update to the boilerplate

[frankcalise]

I can't reproduce this in the latest Ignite, @GiaHuy216 are you still experiencing issues?

[GiaHuy216]

@3210jr After I copied your jest.config.js file and it worked perfectly,thank you.

[infinitered-circleci]

:tada: This issue has been resolved in version 9.6.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: