SyntaxError: Unexpected token import with Jest - reactjs

Question

I'm trying to setup a jest snapshot test with redux-persist in my react-native project. I don't think its an es2015 imports problem as my test code looks something like this:
import React from "react"
import "react-native"
// Note: test renderer must be required after react-native.
import renderer from "react-test-renderer"
import App from "../App"
it("renders correctly", () => {
const app = renderer.create(<App />).toJSON()
expect(app).toMatchSnapshot()
})
I ran this exact same test before I added redux-persist and it was working.
Error thrown by jest:
● Test suite failed to run
/Users/a_050313/Documents/dev/scheduling/node_modules/redux-persist/es/integration/react.js:9
import React, { PureComponent } from 'react'; // eslint-disable-line import/no-unresolved
^^^^^^
SyntaxError: Unexpected token import
1 | import React, { Component } from "react"
2 | import { Provider } from "react-redux"
> 3 | import { PersistGate } from "redux-persist/es/integration/react"
4 |
5 | import "./__debug__/ReactotronConfig" // Run Reactron Tools config
6 |
at ScriptTransformer._transformAndBuildScript (node_modules/jest-runtime/build/script_transformer.js:318:17)
at Object.<anonymous> (App.js:3:13)
at Object.<anonymous> (__tests__/App.js:7:10)`

Answer 1

The error was related to es2015 imports but It is on jest end. By default jest only transpiles project code and react-native code. So the added libs which aren't already transpilled would error out by jest.
(as mentioned on jest docs)
By default the jest-react-native preset only processes the project's own source files and react-native
Solution provided on the official docs seems a bit hacky but thats the only thing I found:
Add following in your package.json jest: { } section or in jest.config.js file.
"transformIgnorePatterns": [
"node_modules/(?!(react-native|my-project|redux-persist)/)"
]
where the bit redux-persist is the thing that solves the problem. If you have problem with other libs just add their names. My list looks something like this:
"jest": {
"preset": "react-native",
"transformIgnorePatterns": [
"node_modules/(?!(react-native|my-project|redux-persist|react-native-linear-gradient|react-native-vector-icons|react-navigation)/)"
]
}
Additional Note just for redux-persist if you import PersistGate from
import { PersistGate } from "redux-persist/lib/integration/react"
instead
import { PersistGate } from "redux-persist/es/integration/react"
(reference)
you'll get the compiled version but for other libs still you got to this the above mentioned solution.