Difference between import and require in jest - react-native

Question

I am writing my first test for a react-native project using react-native-router-flux and react-redux
My code is something like
jest.autoMockOff();
jest.setMock('react-native', {
NativeModules: {}
});
jest.setMock('react-native-router-flux', {
Actions: {}
});
const mockStore = require('../../mock/Store');
const actions = require('../myActions');
...
// Some tests that test if the right actions are dispatched.
The above works, However when I use ES6 import instead of require I have a problem.
If I replace
const actions = require('../myActions');
with
import * as actions from "../myActions"
I get the below error.
Runtime Error
- Error: Cannot find module 'ReactNative' from 'react-native.js'
at Resolver.resolveModule (node_modules/jest-cli/node_modules/jest-resolve/src/index.js:117:17)
at Object.<anonymous> (node_modules/react-native/Libraries/react-native/react-native.js:175:25)
at Object.<anonymous> (node_modules/react-native-router-flux/src/Scene.js:10:18)
While I can work with this, I am curious to understand the reason for failure,
Also note that I am just not able to transpile react-native-router-flux with es2015 presets in .bablerc file and I think I will have to live with that limitation (of not being able to transpile react-native-router-flux).
myActions.js looks like
import {Actions} from 'react-native-router-flux';
export function searchRequest() {
return {
type: "search_request"
}
}
export function searchRequestFailure(error) {
return {
type: "search_request_failure",
error: error.toString()
}
}
export function searchRequestSuccess(payload) {
return {
type: "search_request_success",
payload: payload
}
}
export function search(nameOrAddress) {
return dispatch => {
dispatch(searchRequest())
return fetch("http://localhost:8080/search", {
method: "GET"
}).then((response) => {
return response.json()
}).then((responseData) => {
dispatch(searchRequestSuccess(responseData))
Actions.list() //react-native-router-flux dependency
}).catch(error => {
dispatch(searchRequestFailure(error))
})
}
}
Using react-native 0.26 and jest 12.1.1

Answer 1

That is not the correct ES6 conversion.
const actions = require('../myActions'); // requires the defaultMember of the exported module and
//ES6 (ES2015) equivalent is
import actions from '../myActions';
https://developer.mozilla.org/en/docs/web/javascript/reference/statements/import