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jest fetch is not defined

Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Author laurivaananen commented on Oct 27, 2020 Author laurivaananen commented on Oct 27, 2020 vegan) just to try it, does this inconvenience the caterers and staff? edited. Is a PhD visitor considered as a visiting scholar? If you are planning to use the same in the Node JS Runtime, then you have to make use of 3rd Party Fetch libraries like node-fetch. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is it an experimental browser technology. Not the answer you're looking for? Why you shouldn't mock fetch or your API Client in your tests and what to do instead. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. const fetch = require ('node-fetch'); You signed in with another tab or window. Can Solid Rockets (Aluminum-Ice) have an advantage when designing light space tug for LEO? The beforeEach to clear mocks isn't really required at this point because we only have a single test, but it's good practise to have so you get a fresh start between tests. Here's a usage example repository that showcases how to use MSW for both unit (Jest) and E2E tests. As far as fetch is an async function, you need to run all your tests using pit (read more about async tests here ). Theoretically Correct vs Practical Notation. I have implemented fetch and test case as following, but it gives me an error. Theoretically Correct vs Practical Notation. Is it an experimental browser technology. 8 comments leifdenby commented on Dec 18, 2016 edited React Native version: 0.39.0 Jest version: 18.0.0 Platform: to specific to iOS or Android Operating System: MacOS nico1510 mentioned this issue on Jan 5, 2017 Have a question about this project? (not not) operator in JavaScript? I am using Jest 29.4.3, with Vite 4.1, and react-router-dom 6.8.1. This is what the test outcome says: Bringing in isomorphic-fetch could be a step towards the solution, depending on what flavor of mocking fetch is used. Any ideas appreciated. 9 comments puzzledbytheweb commented on Jan 31, 2019 to join this conversation on the problem with fetch-mock and almost all other modules for mocking fetch is that they demand way too much setup. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Connect and share knowledge within a single location that is structured and easy to search. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. So how do you avoid making HTTP requests in your tests? Find centralized, trusted content and collaborate around the technologies you use most. If you think this issue should definitely remain open, please let us know. Any ideas appreciated. 5 comments jnachtigall commented on Feb 28, 2022 I have seen #1271 (comment) jnachtigall closed this as completed on Mar 3, 2022 thedoublejay mentioned this issue 2 weeks ago Post a comment with the version you tested. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? while essentially the same as the answer of Rupesh - you can expose jest globally without having to import it in each test file - by adding a setup-file to the jest configuration: also in general ESM support for jest is improved by a test script in package.json as so: Thanks for contributing an answer to Stack Overflow! by loading the node-fetch module that is available on NPM) Use the --experimental-fetch flag when you run Node (and make sure it is version 17.5 or newer Share Improve this answer Follow answered Feb 18 at 10:54 Quentin 888k 122 1187 1305 @CupOfGreenTea Not if you (not not) operator in JavaScript? WebThe "ReferenceError: fetch is not defined" occurs when the fetch () method is used in an environment where it's not supported - most commonly Node.js. Why are physically impossible and logically impossible concepts considered separate in terms of probability? Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? You may not need the entire setup, but I'm sure you can find some useful references there. What is the difference between 'it' and 'test' in Jest? What is the !! The package provides a polyfill for .fetch and is well supported and managed by Github.com employees since 2016. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? To use jest.spyOn you pass the object containing the method you want to spy on, and then you pass the name of the method as a string as the second argument.. Jest's spyOn method returns a mock function, but as of right now we haven't You can't test client-side code on the server. maybe I can also add XMLHttpRequest polyfill (required by whatwg-fetch) but haven't tried this. Using Kolmogorov complexity to measure difficulty of problems? Default: 0 By default, Jest runs all tests and produces all errors into the console upon completion. Making statements based on opinion; back them up with references or personal experience. Find centralized, trusted content and collaborate around the technologies you use most. And here Paiza runs on Node JS not on Browser. Not the answer you're looking for? The package jest-fetch-mock gives us more control and avoids us having to handle the double promise response that fetch has. If you are using with Webpack add the package in the entry configuration option before your application entry point. App works but jest tests fail due to missing fetch. Use, @PraveenKumarPurushotaman I have run the code on this project url, @RichardCooper You're running it on Node JS instance in Paiza.io. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. And that's exactly what fetch-mock is giving us. As @ArthurDenture recommended, you can use fetch-mock, but there are some additional packages you will need to install to make it work with React Native and Jest: You can then mock fetch requests in your tests. Coz the error message looks similar to that of Node JS. What video game is Charlie playing in Poker Face S01E07? In your example, you need to use fetch() this way: Here's the Code Sandbox: exciting-bhaskara-sksve. Sorted by: 1 Either: Define a fetch function somewhere (e.g. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Styling contours by colour and by line thickness in QGIS. If I comment out mocking my function, I then get a ReferenceError about fetch not being defined (since getTotalNumPeople uses fetch). As far as fetch is an async function, you need to run all your tests using pit (read more about async tests here ). Sign up for a free GitHub account to open an issue and contact its maintainers and the community. to your account, Do you want to request a feature or report a bug? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. What is a word for the arcane equivalent of a monastery? What is the point of Thrower's Bandolier? Switching this to a jest.config.js file or moving the config into package.json fixes this.. However, if you prefer explicit imports, you can do import {describe, expect, test} from '@jest/globals'. The package provides a polyfill for .fetch and is well supported and Webbail [number | boolean] . Switching this to a jest.config.js file or moving the config into package.json fixes this.. What is the difference between 'it' and 'test' in Jest? Sign in How to react to a students panic attack in an oral exam? I'm trying to use the same example but with no luck. Find centralized, trusted content and collaborate around the technologies you use most. In your test files, Jest puts each of these methods and objects into the global environment. Disconnect between goals and daily tasksIs it me, or the industry? Let's instead mock the interface, the convert function itself. How should I unit test multithreaded code? Can Solid Rockets (Aluminum-Ice) have an advantage when designing light space tug for LEO? Fixing the issue There are 2 ways in which you can fix this issue: Upgrading Node.js to v18 or later Starting version 18, Node.js has started supporting fetch API. Jest provides a .spyOn method that allows you to listen to all calls to any method on an object. Time arrow with "current position" evolving with overlay number. You can also use. How to prove that the supernatural or paranormal doesn't exist? Here is the solution only using enzyme v3 and jestjs, nothing more. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Enzyme: on simulating "click", test asynchronously changed state value. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. => jest. What sort of strategies would a medieval military use against a fantasy giant? About an argument in Famine, Affluence and Morality. This is what the test outcome says: So it's not just jest that's not defined. Why do small African island nations perform better than African continental nations, considering democracy and human development? to your account. Inside of this file we'll add two lines, to mock fetch calls by default. What's the difference between a power rail and a signal line? Install node-fetch: npm install node-fetch Then include it in the code. Many other replies suggest to modify global.fetch with this but I'd like to not do that, @ColinD This override will be limited to the scope of the function/file. Latest version: 3.0.3, last published: 3 years ago. A few things about the API: If fetching a list of data ( /posts) the response will be an array. There are 190 other projects in the npm registry using jest-fetch-mock. Making statements based on opinion; back them up with references or personal experience. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Share Follow edited Aug 3, 2019 at 18:08 neiker 8,868 4 29 32 answered Mar 17, 2016 at 20:48 Webfetch mock for jest. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Follow Up: struct sockaddr storage initialization by network format-string. Do new devs get fired if they can't solve a certain bug? Curiously I ran into problems out of the box using. To learn more, see our tips on writing great answers. @tkrotoff whatwg-fetch didn't work for me, isomorphic-fetch did. vegan) just to try it, does this inconvenience the caterers and staff? How do I chop/slice/trim off last character in string using Javascript? If you are planning to use the same in the Node JS Runtime, then you have to make use of 3rd Party Fetch libraries like node-fetch. Can airtags be tracked from an iMac desktop, with no iPhone? Keep in mind that fetch is a little funny in that if you want the JSON response, you are dealing with 2 promises. The project is written in typescript. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal repository on GitHub that we can npm install and npm test. by loading the node-fetch module that is available on NPM) Use the --experimental-fetch flag when you run Node (and make sure it is version 17.5 or newer Share Improve this answer Follow answered Feb 18 at 10:54 Quentin 888k 122 1187 1305 @CupOfGreenTea Not if you You will need to polyfill the behaviour if you want to make actual http calls, or mock fetch to simulate network requests. What is a word for the arcane equivalent of a monastery? What is the correct way to screw wall and ceiling drywalls? It is hard to test your implementation with the code you supplied, but let's try switching your mock implementation to something like this: Now, whenever you movie service API gets called, you may expect the outcome to be of shape of dummyMoviesData and even match it. Fetch is Undefined in Component when Mocking API Error Response with Jest Asked 1 year ago Modified 1 year ago Viewed 3k times 1 I am testing a component that uses a useEffect hook that fetches data from an API, updates state and And that's exactly what fetch-mock is giving us. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. According to jest-expo/src/setup.js jest already have fetch defined in globals, so you better to remove this from global-mocks.js. Therefore, it makes sense that simply expecting our const response to directly equal the value we are For example, if using MSW, then this is all that's required to get fetch resolving and have MSW intercept fetch requests. I don't have an immediate answer for you (maybe somebody else will) but there are at least a couple of ways of mocking fetch in Jest and using that approach mock responses from /api/auth/session is probably an easy way to emulate the behaviour of being signed in (or not). Acidity of alcohols and basicity of amines. Has 90% of ice around Antarctica disappeared in less than a decade? I'm getting an error stating TypeError: Cannot read property 'then' of undefined for fetch. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Start using jest-fetch-mock in your project by running `npm i jest-fetch-mock`. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Get selected value in dropdown list using JavaScript, Get selected text from a drop-down list (select box) using jQuery. Any help is greatly appreciated! For people passing by, simplest working solution: (because Jest uses Node.js and Node.js does not come with fetch => specific to web browsers), Real life simple example: https://github.com/tkrotoff/MarvelHeroes. How to unit test API calls with mocked fetch() in react-native with Jest, How Intuit democratizes AI development across teams through reusability. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Just thought I'd note that in case that helps. I don't have an immediate answer for you (maybe somebody else will) but there are at least a couple of ways of mocking fetch in Jest and using that approach mock responses from /api/auth/session is probably an easy way to emulate the behaviour of being signed in (or not). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. @tkrotoff Sorry, how import 'whatwg-fetch' is working? Using Kolmogorov complexity to measure difficulty of problems? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. use fetch-mock in tests that are run in node environment. How to prove that the supernatural or paranormal doesn't exist? What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Inside of this file we'll add two lines, to mock fetch calls by default. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? "setupFiles": ["node_modules/w3c-xmlhttprequest/lib/index.js"] Share Follow edited Aug 3, 2019 at 18:08 neiker 8,868 4 29 32 answered Mar 17, 2016 at 20:48 Connect and share knowledge within a single location that is structured and easy to search. Find centralized, trusted content and collaborate around the technologies you use most. I am very new to JS and I believe what im trying to do is not NodeJS because I am just trying to do this in a simple webpage and not in a application, @RichardCooper Then it should work. The text was updated successfully, but these errors were encountered: fetch is not available in Node, which is where Jest is running your tests. Why is this the case? If you're trying to access plain text, then use: If you're using JSON (your solution here), then use: Another alternative will be Axios, which is a Promise based HTTP client for the browser and node.js. We are going to use the convert function as the fetcher funciton that swr expects. How to show that an expression of a finite type must be one of the finitely many possible values? Flutter change focus color and icon color but not works. The text was updated successfully, but these errors were encountered: Hi there! const fetch = require ('node-fetch'); Why you shouldn't mock fetch or your API Client in your tests and what to do instead. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Can you show a screenshot of where the error comes up, please? I wonder if this is because I'm using asdf as my Node version manager and/or because I'm using Node 10.14.2.. envinfo You will need to polyfill the behaviour if you want to make actual http calls, or mock fetch to simulate network requests. JEST tests failing - fetch is not defined Ask Question Asked 8 months ago Modified 1 month ago Viewed 2k times 2 I do have two Jest Test Cases which seem to fail but I dont know what is wrong. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The fetch () API is a browser API implemented in the major browsers. Thanks for contributing an answer to Stack Overflow! How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? In case of manual Jest setup one needs to do that manually. The source code for this article is available here. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? describe ('should renders Main correctly', () => { fetchMock.get ('http://testurl.com/testData').then (res => { expect (res.data).toEqual (testData) }) }); Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? If you preorder a special airline meal (e.g. 5 comments jnachtigall commented on Feb 28, 2022 I have seen #1271 (comment) jnachtigall closed this as completed on Mar 3, 2022 thedoublejay mentioned this issue 2 weeks ago Author laurivaananen commented on Oct 27, 2020 node-fetch JavascriptTypescript The following information is helpful when it comes to determining if the issue should be re-opened: If you would like to work on a patch to fix the issue, contributions are very welcome! Time arrow with "current position" evolving with overlay number, Partner is not responding when their writing is needed in European project application, How to handle a hobby that makes income in US, Is there a solutiuon to add special characters from software and how to do it. You have an awesome Axios Cheat Sheet available for common uses. It is advisable to read the caveats to understand if whatwg-fetch is the appropriate solution. Either way, we're automatically closing issues after a period of inactivity. Find centralized, trusted content and collaborate around the technologies you use most. To learn more, see our tips on writing great answers. You don't have to require or import anything to use them. I solved this by adding isomorphic-fetch. If fetching a single item ( /posts/1) the response will be an object with data. To solve the error, install and import the node-fetch package, which provides a I have tried to utilize this answer but it uses Vitest and not Jest. Oh man I'd been struggling with the same issue and looked far and wide for an answer only to realize it was this. I am trying to get data from the sochain blockchain api using javascript but when I run my code i get the error: So my question is what am I doing wrong why is fetch coming up with this error? It is about Post functions and somehow it doesnt recognize it and gets the error on fetch. I'm running a remote workshop on March 23rd. My code is: You're running it on Node JS instance in Paiza.io. In case of manual Jest setup one needs to do that manually. Disconnect between goals and daily tasksIs it me, or the industry? @hramos this issue definitely should be fixed rather that closed :-( Maybe I'm missing something but I was expecting your package.json to have a script like this: @stealththeninja I did have that script originally. I don't have an immediate answer for you (maybe somebody else will) but there are at least a couple of ways of mocking fetch in Jest and using that approach mock responses from /api/auth/session is probably an easy way to emulate the behaviour of being signed in (or not). If so, is there any information missing from the bug report? That package allows you to set up fake responses and verify sent requests. Is isomorphic-fetch not in the Jest any more? But after following the instructions for enabling ES6 modules with Jest, I replaced that script with, @SlavaFominII: Yup! Asking for help, clarification, or responding to other answers. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. Connect and share knowledge within a single location that is structured and easy to search. How to mock fetch response using jest-fetch-mock, TypeError: Cannot read properties of undefined (reading 'then') - while Mocking Fetch call in Jest, Acidity of alcohols and basicity of amines. Then added this to setupJest.js Well occasionally send you account related emails. use jsdom environment with whatwg-fetch. I wonder if this is because I'm using asdf as my Node version manager and/or because I'm using Node 10.14.2.. envinfo Making statements based on opinion; back them up with references or personal experience. Default: 0 By default, Jest runs all tests and produces all errors into the console upon completion. What is the correct way to screw wall and ceiling drywalls? So instead we will override the global.fetch function with our own fake/mock version of it. How to tell which packages are held back due to phased updates. fetch () was designed for the browser and then back-ported to node.js in a third party module whcih you are apparently missing. 8 comments leifdenby commented on Dec 18, 2016 edited React Native version: 0.39.0 Jest version: 18.0.0 Platform: to specific to iOS or Android Operating System: MacOS nico1510 mentioned this issue on Jan 5, 2017 Please mention your node and npm version and operating system. // Make sure fetch has been called exactly once. What is the !! You signed in with another tab or window. How do we get jest test to use the --experimental-fetch flag? Is it an experimental browser technology. In our case we can do this, and that is because fetch is available globally. fetch is not available in Node, which is where Jest is running your tests. To learn more, see our tips on writing great answers. I tried adding javascript node.js jestjs es6-modules Share Follow edited Dec 8, 2020 at 4:30 I was definitely looking at this code for to long because that was the issue. Here is an example: Due to problems using fetch-mock with jest, I've release fetch-mock-jest. Why does awk -F work for most letters, but not for the letter "t"? Latest version: 3.0.3, last published: 3 years ago. Run Jest again with --debug and provide the full configuration it prints. Are there tables of wastage rates for different fruit and veg? Inside your test case you can mock any function you want by using Jest's mocks: This approach works only for the promise-based test cases (see pit in the Jest docs). => jest. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Are there tables of wastage rates for different fruit and veg? Read through the contribution guide, and feel free to hop into #react-native if you need help planning your contribution. By clicking Sign up for GitHub, you agree to our terms of service and Lifesaver. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Jest: resolves return undefined from Promise, How to fix toArray is not undefined in Jest. fetch () was designed for the browser and then back-ported to node.js in a third party module whcih you are apparently missing. 9 comments puzzledbytheweb commented on Jan 31, 2019 to join this conversation on How to follow the signal when reading the schematic? How to get the code coverage report using Jest? How to react to a students panic attack in an oral exam? I have ts-node version 9.1.1 installed in my package.json file.. If it is global does it interfere with other tests? If you are unfamiliar with WhatWG, learn more about the Web Hypertext Application Technology Working Group on their website. 8 comments leifdenby commented on Dec 18, 2016 edited React Native version: 0.39.0 Jest version: 18.0.0 Platform: to specific to iOS or Android Operating System: MacOS nico1510 mentioned this issue on Jan 5, 2017 There are 190 other projects in the npm registry using jest-fetch-mock. Fetch is Undefined in Component when Mocking API Error Response with Jest Asked 1 year ago Modified 1 year ago Viewed 3k times 1 I am testing a component that uses a useEffect hook that fetches data from an API, updates state and It's also possible to mimic different server status and handle multiple requests in a single test, but I'll leave that to the reader to investigate further. Find centralized, trusted content and collaborate around the technologies you use most. use fetch-mock in tests that are run in node environment. Does a summoned creature play immediately after being summoned by a ready action? Sorted by: 1 Either: Define a fetch function somewhere (e.g. Why is this the case? Installing and adding the below snippet to the top of my jest file fixed it for me: I have the following Jest test code to test a fetch to an endpoint: I know that the movieApiService.getPopularMovies() is a JavaScript fetch request, but Node.js does not have the fetch API, so how I can I make this test to work using Jest? javascript node.js jestjs es6-modules Share Follow edited Dec 8, 2020 at 4:30 Is there a solutiuon to add special characters from software and how to do it. If not, what browser/environment is this? But the failing fetch mock is not returning -- notice the subtle addition of curly braces around that Promise. const fetch = require ('node-fetch'); Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. After installing the package, if you are using create-react-app, there is already a file named src/setupTests.js where you can put global Jest code. How to fix "ReferenceError: primordials is not defined" in Node.js. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Inside of this file we'll add two lines, to mock fetch calls by default. Client on Node.js: Uncaught ReferenceError: require is not defined, Babel 6 regeneratorRuntime is not defined. Inside of this file we'll add two lines, to mock fetch calls by default. fetch do not make the request to the server, This test is inside a react native project, I have a very long timeout. Critical issues have been reported with the following SDK versions: com.google.android.gms:play-services-safetynet:17.0.0, Flutter Dart - get localized country name from country code, navigatorState is null when using pushNamed Navigation onGenerateRoutes of GetMaterialPage, Android Sdk manager not found- Flutter doctor error, Flutter Laravel Push Notification without using any third party like(firebase,onesignal..etc), How to change the color of ElevatedButton when entering text in TextField. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Any ideas appreciated. And remember that using a library such as useSWR will sometimes change state, requiring you to wrap act(() => {}) around your code, and you will need to use findByText as opposed to getByText because the text isn't available on first render. Use CodeSandbox or CodePen for running your code please. Default: 0 By default, Jest runs all tests and produces all errors into the console upon completion. Does Counterspell prevent from any further spells being cast on a given turn? To learn more, see our tips on writing great answers. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Solution 3 As of October 2020, an approach to resolve the error TypeError: fetch is not function is to include the polyfill for fetch using whatwg-fetch. This is because fetch is a Web API and it is not supported in the version of the Node.js installed on your machine. Alternatively, your mock doesn't have to be Jest-specific. This is because fetch is a Web API and it is not supported in the version of the Node.js installed on your machine. Does a barbarian benefit from the fast movement ability while wearing medium armor? Do I need a thermal expansion tank if I already have a pressure tank? Node doesn't have fetch, you need a library like node-fetch or some other polyfill. => jest. A place where magic is studied and practiced? Switching this to a jest.config.js file or moving the config into package.json fixes this.. codeundertest.js import fetch from 'myfetch' codeundertest.test.js jest.mock('./myfetch', () => Promise.resolve({ hello: 'world' }); Oh, you're right. I am not familiar with this annotation. WebGlobals. The error occurs due to the jest.fn call: Any ideas on why this is happening? Bulk update symbol size units from mm to map units in rule-based symbology. How to simulate an event on a unit test with Jest, Enzyme for React-Native, Service mocked with Jest causes "The module factory of jest.mock() is not allowed to reference any out-of-scope variables" error, How to mock react-native module (not 3rd party module) with jest.

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jest fetch is not defined