Jest SyntaxError: Unexpected token < - reactjs

Question

I'm want to test a component in a React app using Jest Enzyme with TypeScript. I follow the instructions on the Jest site, but for some reason I get:
SyntaxError: Unexpected token <
I can test test some functions. There isn't any problem with that, but when I use a component, I get an error.
This is the Jest configuration in file package.json:
"jest": {
"transform": {
"^.+\\.tsx?$": "ts-jest"
},
"testMatch": ["**/__tests__/*.(ts|tsx)"],
"snapshotSerializers": ["enzyme-to-json/serializer"],
"setupFilesAfterEnv": ["<rootDir>/src/setupEnzyme.ts"],
"unmockedModulePathPatterns": ["node_modules/react/", "node_modules/enzyme/"]
}
Enzyme configuration
import { configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';
configure({ adapter: new Adapter() });
export default class TesComponent extends Component {
render(){
return (
<div>test</div>
)
}
}
import { shallow } from 'enzyme'
import TestCompoenent from '../TestComponent'
test('component testing', () => {
const component = shallow(<TestCompoenent />)
expect(component.contains(<div>test</div>)).toBeTruthy()
})
This is the error:
Jest encountered an unexpected token
This usually means that you are trying to import a file which Jest cannot parse, e.g., it's not plain JavaScript.
By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
Here's what you can do:
• 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/en/configuration.html
Details:
/home/user/Documents/local-platform/frontend/src/pages/__tests__/settigs.test.tsx:9
var component = enzyme_1.shallow(<TestComponent_1.default />);
^
SyntaxError: Unexpected token <
at ScriptTransformer._transformAndBuildScript (node_modules/#jest/transform/build/ScriptTransformer.js:471:17)
at ScriptTransformer.transform (node_modules/#jest/transform/build/ScriptTransformer.js:513:25)
I expect for the tests to pass, because Test Component does include <div>test</div>.

Answer 1

Try changing tsconfig.json
"jsx": "preserve" -> "jsx": "react"

Answer 2

It seems that your configuration does not process the TypeScript file (.tsx) properly.
Here is part of my working configuration:
"jest": {
"transform": {
"^.+\\.tsx?$": "ts-jest",
},
"moduleFileExtensions": [
"ts",
"tsx",
"js",
"json"
],
"setupTestFrameworkScriptFile": "<rootDir>/src/setupSpecs.ts"
}
I have used setupTestFrameworkScriptFile instead of setupFilesAfterEnv.