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can i use the tsx extension for test files if using react with typescript

By : Ahmad Hoshya
Date : October 17 2020, 06:10 AM
will help you
Can I use the tsx extension for test files if using React with TypeScript?
code :
npx create-react-app my-app --typescript
cd my-app
npm run eject
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

it('renders without crashing', () => {
  const div = document.createElement('div');
  ReactDOM.render(<App />, div);

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React types files not working in React TypeScript (.tsx) file - Throwing ESLint errors for React Component

By : user3063089
Date : March 29 2020, 07:55 AM
To fix this issue The first error Missing accessibility modifier on method definition render is saying that you did not declare your render method as public or private or any other type (more reading on types. When working with Typescript all class methods need to have be declared accordingly, depending if you want to have them accessible outside your class instance or not. For render method it should be public. Code below should work nicely for you:
code :
public render() {
   return <div>Running!</div>;
public render(): React.ReactNode {
   return <div>Running!</div>;
"rules": {
   "@typescript-eslint/explicit-function-return-type": "off",
   "@typescript-eslint/explicit-member-accessibility": "off"

How to test specific elements of a Create-React-App (in TypeScript) with react testing library

By : crazyrunner2311
Date : March 29 2020, 07:55 AM
With these it helps I generated a project using create-react-app with the --typescript option. , A couple of points, based on your own answer:
code :
test('Verify page header', () => {
    const {getByText} = render(<App/>);
    expect(getByText('Home page').tagName).toBe('H1');
<h1 data-testid="pageHeader">Home Page</h1> // <-- In your component

test('Verify page header', () => {
    const {getByTestId} = render(<App/>);
    expect(getByTestId('pageHeader').textContent).toBe('Home Page');

How To Unit Test React Component With react-intl, react-router-dom v4 and TypeScript

By : user3623389
Date : March 29 2020, 07:55 AM
Hope this helps Redux docs suggest to export the unconnected component (Users in your case) and use it in the tests. That way, you have complete control over the props passed to the rendered instance and, as a bonus, no issues with using enzyme's setState.
So something like:
code :
export class Users extends Component<Props, State> {

    componentDidMount() { ... }

    componentWillUnmount() { ... }

    isReadOnly = (): boolean => {
        // determine if read only.
export default withRouter(Users);
import {Users} from "./Users";

How to unit test TypeScript files with test runner in a webpack project

By : karidreyer
Date : March 29 2020, 07:55 AM
I wish this helpful for you You can create a separate entry point for your test files in webpack, or you can compile ts before running webpack. I'd typically go for the latter
You can compile ts projects with the command tsc -p . and it will convert all .ts files to .js ones. Then you can get rid of the ts-loader and just treat everything as a js file.

JSX not allowed in files with extension '.tsx'eslint(react/jsx-filename-extension)

By : tpau
Date : March 29 2020, 07:55 AM
I wish this help you You probably want to configure the react/jsx-filename-extension rule in your .eslintrc.js so that ESLint is happy about JSX inside your TypeScript files:
code :
rules:  {
  'react/jsx-filename-extension': [2, { 'extensions': ['.js', '.jsx', '.ts', '.tsx'] }],
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