jest mock typescript enumjest mock typescript enum

This is rarely what we want since our tests should be completely isolated and independent. By contrast, an ambient (and non-const) enum member that does not have an initializer is always considered computed. [lines 2224] Modifying the Http class prototype to change the. [lines 2128] Creating a new test to cover the error case. It's also awkward and confusing. I chose the Auth0 SDK because it has very specific use cases intended to be run in a browser and is also often central to what you want to test in your code. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? In general, d.ts should be generated from a ts file, that will make it easier to use when distributing a package via npm. This is possible since const enums cannot have computed members. eg. Seems to only happen when isolatedModules: true is used, but we need this setting to improve performance issue (#1115). Easiest way to remove 3/16" drive rivets from a lower screen door hinge? A literal enum member is a constant enum member with no initialized value, or with values that are initialized to. Sign in Partner is not responding when their writing is needed in European project application, Clash between mismath's \C and babel with russian. Replace "real variable" with "fake variable" for any reason. See TypeScript Usage chapter of Mock Functions page for documentation.. jest.unmock(moduleName) Indicates that the module system should never return a mocked version of the specified module from require() (e.g. Colors and Numbers are undefined. When you pass either a relative path or the name of a third-party module into this function, you are saying to the Jest test runner, Hey, so in the code that were testing right now, youre going to find that we use code from . How to provide types to JavaScript ES6 classes. Thats because, in the actual implementation of this package, the package returns each of useAuth0, Auth0Provider, and withAuthenticationRequired as callable functions. Colors should be: Actual behavior: So youll see errors like: To get around this, we use types provided to us by Jest to let TypeScript know that the module is now a mocked function: A quick word about this: I am very strict about not using type any in my code base. Making statements based on opinion; back them up with references or personal experience. Well occasionally send you account related emails. To install jest using npm run command. into our test file. You signed in with another tab or window. I wanted to be able to let TypeScript know that getLadder & getPlayers were in fact Jest mock functions in addition to having their normal API. How to choose voltage value of capacitors, Torsion-free virtually free-by-cyclic groups. I duplicated the declaration on the .ts files then the test passed. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Why was the nose gear of Concorde located so far aft? I liked it when we could import just the one thing we wanted to mock. Interested in UX/Testing/FE. What's the issue @germain-receeve @thefill ? Any amount is appreciated! How TypeScript infers types based on runtime behavior. How to create and type JavaScript variables. Launching the CI/CD and R Collectives and community editing features for SyntaxError: Unexpected token import with Jest + react-native-animated-ellipsis, configure Jest to support Typescript (NodeJs), Jest - SyntaxError: React Navigation - Unexpected token export for [node_modules\react-navigation\src\react-navigation.js:1], Cannot use import statement outside a module with date-fns in Jest after updating to Angular 13, The number of distinct words in a sentence, Is email scraping still a thing for spammers. TypeScript is not able to check that for us, because, inside the jest.mock call, TypeScript can't tell what "real" module we are talking about. Has 90% of ice around Antarctica disappeared in less than a decade? Flexible yet type-safe mocks that work for any function including React components. All rights reserved. Lets start with numeric. Its fairly simple once you understand exactly whats what in Jest. The @auth0/auth0-react package returns a useAuth0 hook, an Auth0Provider component for context, and helper functions like withAuthenticationRequired, among other things. The trick here is actually to take a step back from Jest module factories, and instead, let Jest handle more of the mocking automatically for us: That's it! @ahnpnl, no I don't have it in my tsconfig.json (or any other place). But we dont actually want to use that code here because its not going to work in a test environment. One other thing we really need to watch out for here though is making sure we clear our mocks between tests. To learn more, see our tips on writing great answers. If that check succeeds, then our || will short-circuit, and the body of the if will run. We can test the routes defined in our API using Jest and SuperTest. Why is it closed? I was able to replicate this issue and dig into it a bit. You have tet.d.ts but you don't have tet.ts which causes the error. Instead it uses the enum value as key to access a map passed as a second parameter. became This is Jest's module mocking in action. Have a question about this project? Is there a more recent similar source? run program.emit with filelist of all files. privacy statement. The following doesn't work: Of course typescript complains that the argument type and the parameter type don't match. We need to instruct Jest to use the mocked Http class when running the test for the Users class. Because getLadder & getPlayers are making requests to the Firebase Cloud Firestore (a NoSQL database in the cloud), we need to mock those functions to return mocked data. If you'd like to modify a mock / assert things that happened to a mock, you need to import them from the "real" class. Built using Gatsby and deployed to Vercel. Enums come in two flavors string and numeric. Step 2. An overview of building a TypeScript web app. jest.mock () undefined TypeScript jest.Mock jest.clearAllMocks () useModuleMethodMock.test.ts This works! @safareli are you using isolatedModules: true ? Find centralized, trusted content and collaborate around the technologies you use most. It has no reason to believe they should match up with any "real" types it already knows about. Thanks for providing the example. Note: This article assumes a basic understanding of Jest and the React Testing Library. This issue only happens for us only when running the unit tests. Install Jest and mongodb-memory-server. Each entry in this array is an object containing a type property, and a value property. Well, it turns out its not that straightforward. Find centralized, trusted content and collaborate around the technologies you use most. I came to the same conclusion after thinking about it for a couple more minutes. The only solution I can think of would be to do a full compile ahead of time and then serve the transpiled JavaScript files as Jest requests them. Why is there a memory leak in this C++ program and how to solve it, given the constraints? Colors and Numbers should not be undefined in file2. Refresh the page, check Medium 's site status, or find. But the name: Jest, and in particular that J, betrays a potential weakness. We ended up solving the issue by updating our jest.config.js file: we added core-js to setup files and isolated modules from ts jest. The problem is not visible when the code is bundled using webpack with ts-loader. Refresh the page, check Medium 's site status, or find something interesting to read. Using enums can make it easier to document intent, or create a set of distinct cases. Thanks for sharing. It will hopefully be that much clearer now that you understand what is happening in the background. According to TypeScript: Handbook - Utility, Partial constructs a type with all properties of Type set to optional. Basic Usage December 13, 2020 5 min read 1601. Typescript is a superset language of JavaScript. Is lock-free synchronization always superior to synchronization using locks? For a dependency, this would look something like this: This line alone gets the Hey, Jest. This class will use the awesome axios to make the requests. The first is that enum members also become types as well! Hope this was helpful. For example: In that example, we first checked whether x was not E.Foo. How to get the call count using Mock @patch? d.ts extension is type definition file, I wouldn't put enum definition into d.ts to avoid issues. Using jest.fn() for these properties allows us to further mock the implementation of the functions returned from our package. Sometimes I can feel fullstackness growing inside of me . Launching the CI/CD and R Collectives and community editing features for How do you explicitly set a new property on `window` in TypeScript? And it gets at an important little quirk of the way Jest and TypeScript interact. In order to properly unit-test, we need to isolate the unit of code being tested from all of these other concerns. Please have a look and let me know what you think. Using enums can make it easier to document intent, or create a set of distinct cases. We cant access useAuth0, Auth0Provider, and withAuthenticationRequired to tell them how we want them to act. For that, we just need to add the following line to the users.spec.ts file, right after the import statements and before the first describe block: If we run the tests again now with the wifi turned off, they will still pass. That is not a trivial change, of course, and would require having a watch process in place as well. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Let's declare an interface in typescript with an enum being used in the interface. Now, since youre an awesome developer, you want to write some unit tests for your class. Similarly to jest.mock(), jest.fn() simply says, Were going to mock what this function does, but it doesnt tell Jest how we want to mock it. Connect and share knowledge within a single location that is structured and easy to search. Thanks for contributing an answer to Stack Overflow! The solution was copy the enum also in the mocked service and export it so the classes that used the service can access to it. Well, just like mock implementations persist through the whole test file, so too does the mock's "memory" of when it has been called. Since we are telling Jest to replace the real class with the mock one on line 5, were going to be actually modifying the mock class. In other words, were assuming here that our code is only using isAuthenticated, loginWithRedirect, and logout from the useAuth0 hook. Enums are real objects that exist at runtime. First two gotchas: the mock needs to 1) have the same filename as the mocked class; and 2) be inside a folder named __mocks__ inside the folder that holds the mocked class. But this will affect performance since it will compile same files many times. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. If in the above example we added a third test: That test will pass! Since were awesome devs, we will write the test first: This is a fairly simple test: we expect the Users class to have an all() method that returns an array of users. @NitzanTomer you're absolutely right. Here are two approaches to avoiding these pitfalls: A. With smart files updating (versioning) it should work pretty fast. However, we cannot solely use partial here, because our object is nested. But I'm still not in love with it. // Works, since 'E' has a property named 'X' which is a number. For example, the following enum, can actually be passed around to functions. So it's any everywhere. [line 2] Importing the dependency to be modified. Install ts-mock-generator via npm: npm i @mangm/ts-mock-generator This package internally uses ts-morph. Without the guardrails of TypeScript, you could just do this: Again, the shape of this return value must match the shape of the actual return value from the modules function. But how? The examples mock a class that's a default export. Bryn Bennett 819 Followers So, lets create a folder named common and a http.ts file with a Http class in it. By definition of mocks and stubs, this means each test double is a stub. This utility will return a type that represents all subsets of a given type. This library generates mock data from Typescript interfaces. Lets go trough the important lines of the sample test file: line 5: you say to jest that you want to mock typescript class SoundPlayer and therefore a mock constructor is going to run instead of the real SoundPlayer. With TypeScript, its slightly trickier because we run into type errors. Alas, we have our topic for the day: How do you properly mock what you need for a production React application? For me making the dependency tree a bit more granular helped, either: I am also still seeing this issue. I dont need to mock functions all that often. React components are just functions, and we can mock them just like any other function, just like we have done already in this post: This works exactly the same way as before. Version A and Bs enums can have different values, if you are not very careful, resulting in. Youll get a general understanding that we use jest.mock() with either a path or dependency name passed in as an argument. Ambient enums are used to describe the shape of already existing enum types. This is the approach taken internally by the TypeScript project itself. By clicking Sign up for GitHub, you agree to our terms of service and How to choose voltage value of capacitors, Applications of super-mathematics to non-super mathematics. There is one slight quirk with this though. 6// Create a new variable and type it as jest.Mock passing the type. My enum that I am exporting is not with const: Im using ts-jest 27.1.4, it still shows the error. Thats all. Well, it doesn't by definition. How can the mass of an unstable composite particle become complex? To do this we will need to retain a reference to the exported member we care about so that we can manipulate it in some way: This might look a little funky at first. An expression is a constant enum expression if it is: It is a compile time error for constant enum expressions to be evaluated to NaN or Infinity. Enums allow a developer to define a set of named constants. Any enum entry requested fail with "Cannot read property 'enum entry' of undefined". Obviously, at this point we would probably want our Users class to return real data. The idea is to create an in-memory sqlite database that we can setup when the test starts and tear down after the test Prerequisites To do this we are going to use the following npm packages. The text was updated successfully, but these errors were encountered: Could you please share an example of a const enum that fails to get imported? With this understanding, I now recommend that you explore Jests documentation on mocking. How to mock an imported Typescript class with Jest # jest # testing # angular # typescript Sooner or later in your unit tests you will run into an issue where you need to import a class into your test and mock it, to keep up with good test hygiene. We will discuss mocking on a philosophical level and walk through basic mocks of a local Config file as well as Auth0s React SDK. Theming and Styling. Jest is a popular testing framework that covers all aspects of testing including mocking, verifying expectations, parallel test execution and code coverage reports. The modifications are not that much, but again it took us a while to figure them out. Using Jest Mocks + TypeScript the Right Way | by Bryn Bennett | Better Programming 500 Apologies, but something went wrong on our end. It's very convenient. to your account. Get notified about new blog posts, minishops & other goodies, How to create complex conditional generic type expressions in TypeScript that can even be recursive, Tips & tricks for reverse-engineering function, object & array TypeScript types from 3rd-party libraries that fail to export them, Cases where TypeScript const assertions help avoid type errors with union literals in objects and more, How to avoid receiving the TypeScript any type from the Fetch API when retrieving JSON data, 2015 2022, Ben Ilegbodu. Can't import const enum with typescript by jest testing. String enums allow you to give a meaningful and readable value when your code runs, independent of the name of the enum member itself. The empty object corresponds to any React contexts that are available to this element. So how can we mock it? I posted an answer which explains why I at first thought mocking my enum was a good idea. Mocking is fine in Jest, but calling .mockResolvedValue on the mocked getLadder & getPlayers functions cause type errors. But I have no control on the State enum. Instead, use keyof typeof to get a Type that represents all Enum keys as strings. Watch how the mock is used in our code. I chose the name asMock for the function to try to convey that the function only does a type assertion. In general, the input files ts-jest processes depending on jest, whatever jest gives, ts-jest will process. to your account. References to other enum members are always emitted as property accesses and never inlined. The goal of unit testing is to confirm that a block of code written by you (or someone on your team) works as expected. jest in console and in IDEA runs without problem.. but wallaby import BrandEnum as undefined always. First, we will install Axios if you didn't install "yarn add axios". See how TypeScript improves day to day working with JavaScript with minimal additional syntax. Thumbs up! If thats the case, Im glad I was able to help! I believe your issue is as @EduardoSousa indicated, in the syntax for the export. This allows us to confidently assert on the result of our code block. Why does Jesus turn to the Father to forgive in Luke 23:34? Even though, syntactically, we are importing from the actual third-party dependency, the imports are actually mocks as far as the Jest environment is concerned. import {BrandEnum} . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. So, as I see, two options to workaround. In my specific case, the function being tested uses an enum as a set of unique identifiers (protects against mistyping identifiers, alternative to strings in code), but doesn't operate on any particular identifiers. and it works fine with wallaby but not const enums. If you have it as true, enum won't work. TypeScript (as you probably already know) is an open source, strongly typed, object-oriented compiled language developed and maintained by the team at Microsoft. You can test with beta version (see #697) which handles const enum and others thanks to the language service. vue-typescript-admin-mock-server:for vue-typecript-admin-template 04-29 Vue TypeScript vue-typecript-admin-template apijavascripttsc Piotr N. 10 33 : 28. Making statements based on opinion; back them up with references or personal experience. The source code is hosted on Github. . Const enums are defined using the const modifier on our enums: Const enums can only use constant enum expressions and unlike regular enums they are completely removed during compilation. Find the best open-source package for your project with Snyk Open Source Advisor. Take a second and browse through Jests mocking documentation if you havent yet. I first thought my aliases were the source of it. In TypeScript, enums, or enumerated types, are data structures of constant length that hold a set of constant values. First, install SuperTest by running: $ yarn add -D supertest @types/supertest. The mocked functions are still the same, but they now have the full type information. microbit-foundation/microbit-universal-hex#11. what's the solution and is it documented somewhere? But TypeScript doesn't "see" that this has happened, so we have to help it out. I can confirm this is still an issue for version "24.0.2". One important difference between ambient and non-ambient enums is that, in regular enums, members that dont have an initializer will be considered constant if its preceding enum member is considered constant. This option defaults to 'false' but if you find yourself writing jest.clearAllMocks() in a lot of files, you might want to try turning that option on. I'll leave what helped me for others to find. 2 Cor 5:17. Explore over 1 million open source packages. It doesnt need to include everything. To avoid paying the cost of extra generated code and additional indirection when accessing enum values, its possible to use const enums. There are three types of enums: The problem is that maybe getUserDetails depends on a database or some network calls, which we don't have available while running our tests. Are there conventions to indicate a new item in a list? jest.mock lets us choose the file we want to fake, and provide an implementation. Enums in TypeScript have their own uses as such, common usage is the string enums used to represent a set of static values selectable by the user itself. We can streamline it a bit like so: This also works. TypeScript cant see that weve mocked useAuth0 it still thinks that were using the actual implementation rather than the mock implementation. Refresh the page, check Medium 's site. But it wasnt a total waste of time because I cribbed mocked() from ts-jest to create my own asMock() helper. Mocking a default export. TypeScript enums vs. types for writing readable code. Control the return, resolved, or rejected values. Oh sorry I was unclear. If youve been dealing with this problem and youre already familiar with how Jest mock functions work in JavaScript, this may be all you needed in order to solve your problem. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. @safareli you gave me the idea of checking this in my code because I had the same problem. We get an error that looks like: Ive always been adamant about type-checking my tests, but in the past I would use // @ts-ignore comments. Asking for help, clarification, or responding to other answers. The TypeScript docs are an open source project. Provides complete Typescript type safety for interfaces, argument types and return types; Ability to mock any interface or object; calledWith() extension to provide argument specific expectations, which works for objects and functions. But we know that Jest added that while mocking the module. Each enum member has a value associated with it which can be either constant or computed. Is it possible to mock a function called from inside module in jest? Type 'ShapeKind.Square' is not assignable to type 'ShapeKind.Circle'. You can easily ban const enums with the help of a linter. Any update on this once, we're still facing the issue in our Vue project? I've come across a few different ways to implement it, and this is my preferred way to do it. I think that this comment in the Typescript repo explains the cause of this issue. In this case, we just choose to mock the component by returning an empty fragment which is the shortest way to satisfy a JSX.Element return type. Frontend Chapter Lead @car2go. If you remove the circular dependency everything seems to work fine. How to react to a students panic attack in an oral exam? With mocks, we can: 1. In my specific case, the function being tested uses an enum as a set of unique identifiers (protects against mistyping identifiers, alternative to strings in code), but doesn't operate on any particular identifiers. Statements based on opinion ; back them up with references or personal experience these concerns. Control the return, resolved, or rejected values whether x was E.Foo... Indicated, in the interface is happening in the above example we added a third test that... Assumes a basic understanding of Jest and TypeScript interact in general, the input files ts-jest processes depending on,... Use keyof typeof to get the call count using mock @ patch of extra code! That while mocking the module idea of checking this in my code because i had same. We can test the routes defined in our API using Jest and community! Is lock-free synchronization always superior to synchronization using locks turn to the same problem mangm/ts-mock-generator this package internally ts-morph. Never inlined and Numbers should not be undefined in file2 this RSS feed, and. Eduardosousa indicated, in the TypeScript project itself and independent wallaby but not const enums not love. @ EduardoSousa indicated, in the interface: that test will pass i would n't put enum definition d.ts... Updating our jest.config.js file: we added a third test: that test will pass, create. We clear our mocks between tests have no control on the mocked getLadder & functions! Far aft pretty fast how the mock is used, but we know that added. Value associated with it instead it uses the enum value as key to a! Typescript vue-typecript-admin-template apijavascripttsc Piotr N. 10 33: 28 it should work pretty.! The input files ts-jest processes depending on Jest, but again it took us while... Cc BY-SA internally uses ts-morph also become types as well any `` real '' types it already about. Panic attack in an oral exam that hold a set of constant values really need to isolate unit... Member has a property named ' x ' which is a stub all! @ safareli you gave me the idea of checking this in my tsconfig.json ( or any other place.... Contexts that are initialized to and is it possible to use the functions. Topic for the function only does a type that represents all enum keys as strings the requests of generated... Youll get a general understanding that we use jest.mock ( ) for these properties allows to! Second and browse through Jests mocking documentation if you have tet.d.ts but you do n't match will same. To instruct Jest to use the mocked getLadder & getPlayers functions cause type errors definition into d.ts to avoid.... On a philosophical level and walk through basic mocks of a local file. See '' that this comment in the interface gives, ts-jest will process that mocking! Open Source Advisor the above example we added a third test: that will... From a lower screen door hinge const enum with TypeScript by Jest Testing the jest mock typescript enum,.... Enums can make it easier to document intent, or find getLadder & getPlayers functions type! Thinking about it for a free GitHub account to open an issue for ``. Will pass tests for your class back them up with any `` real '' types it already knows about package... Additional syntax files then the test passed this package internally uses ts-morph prototype to change the connect share... Antarctica disappeared in less than a decade can the mass of an unstable composite particle become complex also works can. T install & quot ; for any function including React components Jest Testing match up any..., in the background the function to try to convey that the argument type and the community it possible mock... Of our code is bundled using webpack with ts-loader to other enum members are always as..., betrays a potential weakness confirm this is still an issue and its! I liked it when we could import just the one thing we wanted to mock are to! Returned from our package love with it which can be either constant or.! Object corresponds to any React contexts that are available to this RSS feed copy...: $ yarn add axios & quot ; fake variable & quot ; variable. Of mocks and stubs, this means each test double is a stub ) helper either constant or.... Implementation rather than the mock implementation enum values, if you are not very careful, resulting in have! Attack in an oral exam, loginWithRedirect, and withAuthenticationRequired to tell them how we want them to.! Our || will short-circuit, and a http.ts file with a Http class prototype change. Enums are used to describe the shape of already existing enum types located so far aft from ts.! C++ program and how to get the jest mock typescript enum count using mock @ patch still seeing this.... Key to access a map passed as a second parameter object is nested with Snyk open Source Advisor property. To only happen when isolatedModules: true is used, but we dont actually want to write unit. On writing great answers not with const: Im using ts-jest 27.1.4, it doesn & # x27 t! Am exporting is not with const: Im using ts-jest 27.1.4, it out! Not assignable to type 'ShapeKind.Circle ' type it as true, enum wo n't work additional when. Mock what you need for a dependency, this would look something like this: this assumes. Waste of time because i cribbed mocked ( ) with either a or., so we have our topic for the function to try to convey that the function only does type! The shape of already existing enum types $ yarn add -D SuperTest @.... ; with & quot ; fake variable & quot ; type 'ShapeKind.Square ' is not visible when code. As jest.mock passing the type constructs a type property, and logout from the useAuth0 hook means each double. Wasnt a total waste of time because i had the same problem enum that i exporting. It documented somewhere as Auth0s React SDK ts-jest 27.1.4, it turns out not..., since youre an awesome developer, you want to fake, and withAuthenticationRequired to tell them how want. Same files many times using isAuthenticated, loginWithRedirect, and a http.ts file with Http. Project with Snyk open Source Advisor an object containing a type that represents all enum keys as strings have control! I can feel fullstackness growing inside of me true is used, but again it us... To work fine with minimal additional syntax JavaScript with minimal additional syntax logo 2023 Exchange... The Users class 6// create a folder named common and a value property API using Jest and TypeScript.! The Hey, Jest being used in our API using Jest and SuperTest good idea we need to Jest... A class that & # x27 ; s also awkward and confusing how... Create a new item in a test environment all subsets of a linter new and... That Jest added that while mocking the module and SuperTest is type file... Assert on the mocked functions are still the same problem allows us to mock... File: we added core-js to setup files and isolated modules from ts Jest site design / logo Stack... If thats the case, Im glad i was able to replicate this issue of Jest and body! Now recommend that you understand what is happening in the above example we added core-js to setup files isolated... Through Jests mocking documentation if you remove the circular dependency everything seems to in., Partial constructs a type property, and the parameter type do n't have it in my tsconfig.json or. Further mock the implementation of the functions returned from our package are two approaches to avoiding these pitfalls a.: npm i @ mangm/ts-mock-generator this package internally uses ts-morph as @ EduardoSousa indicated, in the above example added... With any `` real '' types it already knows about fake, and withAuthenticationRequired to them... Match up with any `` real '' types it already knows about i am exporting is not assignable to 'ShapeKind.Circle. More granular helped, either: i am exporting is not a trivial change of... Structured and easy to search of me property named ' x ' which is a constant enum is. An initializer is always considered computed many times assumes a basic understanding of Jest and SuperTest EduardoSousa indicated in. In that example, the input files ts-jest processes depending on Jest, whatever Jest gives ts-jest. D.Ts extension is type definition file, i now recommend that you what. Granular helped, either: i am also still seeing jest mock typescript enum issue only happens for us when... And paste this URL into your RSS reader all of these other.. Body of the functions returned from our package obviously, at this point we would probably want our Users.! Explains the cause of this issue and contact its maintainers and the.... Is as @ EduardoSousa indicated, in the TypeScript repo explains the cause this... S site than the mock implementation us choose the file we want to fake, and the parameter type n't. Full type information improves day to day working with JavaScript with minimal syntax... As undefined always that hold a set of named constants feed, copy and paste URL... Choose voltage value of capacitors, Torsion-free virtually free-by-cyclic groups and in runs. ( versioning ) it should work pretty fast to indicate a new variable and type it as jest.mock the...: of course, and withAuthenticationRequired to jest mock typescript enum them how we want since our should! Example: in that example, we can test the routes defined in our project. Typescript complains that the argument type and the parameter type do n't have tet.ts which causes the error.!

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