Type promise string is not assignable to type. Type 'Element' is not assignable to type 'ReactPortal'.
Type promise string is not assignable to type How do I solve this problem? Feb 27, 2024 · The "Type 'unknown' is not assignable to type" error occurs when we try to assign a value with a type of `unknown` to a value of a different type. I'm getting the following error: No overload matches this call. I think it was because we previously lacked the ability to assign lower priority to such inferences (as they are more speculative), but we have that ability now. Feb 2, 2021 · I'm building the API to connect my react app with my backend service and I want to use typescript to specify the type of data inside my Axios request. Does someone see the issue here? A playground containing the conditional type as well as my abstraction can be found here. Exploring the ReactNode Type The ReactNode type is a fundamental concept in React's type definitions. Fix it with string concatenation, templates, or assertion functions. To avoid this exception, you can first get the item from local storage and then use it like: May 13, 2025 · I ran across this trying to find an example of using redux-thunk with typescript. See full list on bobbyhadz. Type ' (data: any) =>… Feb 23, 2021 · I am currently using Typescript in my react project and I am trying to call an API in my anchor tag but I get the following error: Type 'Promise<void>' is not assignable to type 'string'. Oct 26, 2024 · In the above code, MyComponent is expected to return a type reactnode, which is a type that can represent any React renderable output, including null, string, number, or a React element. ReactPortal'. Element' is not assignable to type 'ReactNode' Asked 3 years, 3 months ago Modified 1 year, 5 months ago Viewed 90k times Jun 18, 2022 · I'm trying to use the Item component, but it gives this error: (alias) const Item: (id: string) => Promise<JSX. However on the catch block you are returning a Promise<unknown>, because TypeScript now considers the catch variable as unknown. Apr 13, 2022 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Till an issue with 2. The page works fine in the browser without any errors Jan 8, 2024 · Assuming you are certain of the type structure at runtime, you can use a type assertion to override TypeScript’s type checker concerns. Mar 27, 2017 · So, you must specify return Promise type directly: Or remove function return type. 01:15 So assignable just means can you pass it into that slot or can you not? So you can pass a more specific type into a wider type. Types of property 'parent' are incompatible. May 13, 2022 · The editor is showing Type 'Promise' is not assignable to type 'void | Destructor'. Now, the only thing that we can't pass to it are things that are not strings, so number. To address this, some are type casting the component and exporting the casted version. Type 'Promise<TQueryFnData>' is not assignable to type TQueryFnData | Promise<TQueryFnData> which doesn't make sense to me, since Promise<TQueryFnData> should be assignable to the inferred return type of QueryFunction. index. I don't think that's what Jan 8, 2024 · Overview When working with TypeScript, you might encounter the not assignable to type 'never' error. You'll have to provide the type of the promise manually. Jun 1, 2022 · Types of property 'register' are incompatible. I opened an issue on redux-thunk, but did not receive much help: Also, in my use case, I am dispatching things before and after the promise resolves. Types of parameters 'response' and 'value' are incompatible. For example, a fulfilled promise that contains a number will be a Promise<number>. This is because the example variable might contain a string or and ArrayBuffer. Jan 13, 2021 · 11 I got type this problem with the following code: "Argument of type ' (response: IResponse) => void' is not assignable to parameter of type ' (value: void) => void | PromiseLike'". I got an issue with one of my pages in next. Thanks! Jul 10, 2020 · test is then assigned to ttt, but it's not compatible to have a possibly undefined b key in the new interface t. Jul 6, 2022 · Assume your response from http. Type 'Promise<Browser | Element | MultiRemoteBrowser>' is not assignable to type 'Browser | Element' Oct 25, 2023 · Type 'Promise<Element>' is not assignable to type 'ReactNode' after upgrading nextjs Nov 30, 2020 · And Type 'ReactNode' is not assignable to type 'ReactElement<any, any>'. For example, string type represents an infinite set of possible strings. Type '(req: Request, res: Response, next: any) => Promise<any>' is missing the following properties from type 'Application': init, defaultConfiguration, engine, set, and 61 more. children}</Text> ~~~~~~~~~~~~~~~~ Feb 27, 2024 · The "Type 'void' is not assignable to type" TypeScript error occurs when we forget to return a value from a function. json Apr 8, 2022 · To pick up a draggable item, press the space bar. ts Mar 5, 2018 · Type 'promise. Types of parameters 'data' and 'variables' are incompatible. In this post, we'll explore the cause of this error and provide a solution. The only thing missing from the examples above is how to type getState. I've been scouring the documentation and help articles for a while now, but no dice. Type 'string | null' is not assignable to type 'string | undefined'. The long-term discussion about this problem can be found here. Feb 13, 2023 · Type '{ user: User; session: { id: string; sessionToken: string; userId: string; expires: Date; }; }' is not assignable to type '{ session: AdapterSession; user: AdapterUser; }'. Feb 12, 2025 · Argument of type '(req: Request<SerialNumberParams>, res: Response) => Promise<express. I understood, that right now I need to use useFormState intead of us Apr 6, 2023 · Decorator function return type '(this: ProductsService, args: any[]) => unknown' is not assignable to type 'void | ((mockProducts: any) => Promise Aug 2, 2022 · Type ' () => JSX. Element> import Item Type ' {}' is not assignable to type 'string'. The problem is that [] is not enough information for typescript to know what should into that array, since there is no contents to infer types from. How can I update the type of data inside Axios response without modifying the other fields (see getAllProjects in the code below)? May 14, 2018 · The problem is that storage writes themselves are not synchronous, so imagine this situation: a modal dialog triggers a call to saveNote() and then closes itself, which results in a list of notes page calling 'getAllnotes ()` to refresh its list of notes. Apr 11, 2022 · It appears that TypeScript is having trouble with async components, expecting JSX but not recognizing Promise. Is saying you are trying to assign ReactNode as return type instead of the expected ReactElement<any, any> In this article, we have discussed what type is not assignable to type reactnode means and how to fix errors about type is not assignable to type reactnode. Jul 4, 2022 · Type '() => Promise<Type<any> | Routes | NgModuleFactory<any> | Observable<Type<any> | Routes> | typeof LoginRouting>' is not assignable to type 'LoadChildrenCallback Sep 29, 2020 · Explanation The useState function has a generic parameter which we are not setting/declaring in the original case. how to fix it or what Aug 11, 2020 · My issue though is that the function is returning a Promise<string> but the src property from IonImage is wanting just a simple String type This is the error I'm getting: Type 'Promise<string>' is not assignable to type 'string'. Type 'P' is not assignable to type 'keyof T2'. You can fix this by add the type directly to test: May 25, 2018 · Type 'boolean' is not assignable to type 'true' with boolean being used by typescript for literal true. # Get the return type of a Promise in TypeScript Use the Awaited utility type to get the return type of a promise in TypeScript. In other words, a Cat is assignable to an Animal because a Cat is an acceptable substitute for an Animal. com Dec 14, 2024 · Understanding why the 'Promise is not assignable to type' error occurs and knowing how to address it is crucial for writing robust Typescript code. Sep 20, 2018 · Just to clarify, what is changed is not the runtime behavior of the program (there are no types at runtime!). Types of property 'name' are incompatible. 🙂 Expected behavior Async functions that resolve non-void are assignable to async function types that resolve void, just like synchronous functions that return non-void are assignable to synchronous function types that return void. Jun 21, 2021 · I'm trying to get a new object/type from the other one, but get a Type 'string' is not assignable to type 'never' error Jul 1, 2022 · 🙁 Actual behavior Errors as noted in code comments. This can be a puzzling message if you’re not familiar with TypeScript’s type system. Feb 27, 2024 · The "Type 'string' is not assignable to type" error occurs when we try to assign a value of type `string` to something that expects a different type. You're setting it to an object with a contacts key, which is an array. Don’t be fooled into just thinking this is a string problem because it would happen whenever the reject and resolve types match in this way. get is an array, here you are returning Promise from function memberService. Rather than: Jan 13, 2018 · I solved a lot of " not assignable to type 'IntrinsicAttributes & IntrinsicClassAttributes " type of errors (Microsoft closed issue) just by declaring an object that is passed entirely to the component. Property 'branches' is missing in type 'Promise<any[]>'. Sep 21, 2023 · Type 'Plugin<any>' is not assignable to type 'PluginOption'. 18 <Text>{props. However, the test runs and succeeds. Type 'null' is not assignable to type 'string | undefined'. <create || Dec 2, 2020 · Argument of type '(req: Request, res: Response, next: any) => Promise<any>' is not assignable to parameter of type 'Application'. Feb 2, 2020 · Thanks If you're positive that the repo. Jan 31, 2023 · 当我们尝试将具有 Promise 类型的值分配给具有不兼容类型的值时，会发生“ Type 'Promise' is not assignable to type ”错误。 要解决错误，需要在赋值之前解决 Promise 并使两个兼容类型的值。 下面是产生上述错误的一个示例。 // 👇️ function example(): Promise<string> async function example() { const result = await Promise All promises have the type Promise<T>, where T is the type of the value inside the promise. Sep 3, 2024 · Error: Argument of type 'ChainablePromiseElement' is not assignable to parameter of type 'Element'. Jul 26, 2020 · Argument of type 'Express' is not assignable to parameter of type '(req: Request, resp: Response<any>) => void | Promise<void>'. AnchorHTMLAttributes. This does not guarantee safety but tells the compiler you know what you’re doing. Property 'children' is missing in type 'ReactElement<any, string | JSXElementConstructor<any>>' but required in type 'ReactPortal'. I googled about it and what i found other's saying about is that it is an issue with props. d. Jun 30, 2021 · It will tell you the type of serverData is never[]. This error can be frustrating, especially when you're trying to get your code up and running quickly. Object literal may only specify known properties, and 'mutationFn' does not exist in type 'readonly unknown[]'. If you leave out the type, TS infers it, so the type of arr will be {type: string;}[] and you don't get the error. I was coding some test cases for Nest. Aug 2, 2018 · @types/react and @types/react-dom type 'Element' is not assignable to type 'ReactElement<any> []' #27805 Dec 13, 2021 · That's because the return type of Local storage is string | null, and not just string. Feb 27, 2024 · The "Type 'unknown' is not assignable to type" error occurs when we try to assign a value with a type of `unknown` to a value of a different type. So when we annotate a variable with type string, such a variable can only have values from within that set, i. ts (2007, 9): The expected type comes from property 'href' which is declared here on type 'DetailedHTMLProps<AnchorHTMLAttributes, HTMLAnchorElement>' Feb 7, 2019 · For reasons that are lost to history we don't make inferences to type parameters in unions with other type parameters. I fixed this problem by replace Promise<void> by Promise<any>. Type 'string' is not assignable to type but I get Type 'Promise<{}>' is not assignable to type 'Promise<HTMLImageElement>'. How to fix that? Your function is expecting you to return a Promise<string>. Jun 30, 2023 · Type 'ReactElement<any, string | JSXElementConstructor<any>>' is not assignable to type 'React. ts (2322) index. Sometime that's happening because the mocked fn has both callback and promise version and the callback version shadows the promise one Aug 16, 2020 · Type '{ (): Promise<JSX. TypeScript considers a type assignable to another type if one is an acceptable substitute for the other. Type 'Promise<Response<any, Record<string, any>> | undefined>' is not assignable to angular2 TS2322 Type 'Promise<void>' is not assignable to type 'Promise<string>' when given a string Asked 8 years, 6 months ago Modified 8 years, 6 months ago Viewed 2k times Jan 22, 2023 · Type 'number' is not assignable to type 'string'. In this case useState() with no arguments, TypeScript infers the type as undefined. Aug 1, 2017 · ES6 has adopted this spec for its Promise implementation. Type ‘Promise<false | User>’ is not assignable to type ‘PromiseLike<string | boolean>’. For the moment, we have to rely on workarounds. So type number is not assignable to type string. The Role of TypeScript in React Should I use TypeScript with React? TypeScript with React adds static type checking, which can prevent many runtime errors by catching them at compile-time. Learn how to fix Typescript ts2322 error, which occurs when assigning a value of one type to a variable of another type, and improve your code's type safety and maintainability. I just Mar 5, 2024 · Unraveling the Typescript Error: Type () => Boolean Is Not Assignable to Type Boolean One of the enthralling challenges developers often encounter while working with TypeScript is type discrepancies, leading to errors such as “Type ‘ () => boolean’ is not assignable to type ‘boolean'”. 6. You can fix this by add the type directly to test: Feb 29, 2024 · The error "No overload matches this call" occurs when we call a function and pass it a parameter that doesn't match any of its specified overloads. ts(2322) credentials. resolve([newUser])) to navigate that problem. Dec 20, 2018 · TS2345: Argument of type 'void | AxiosResponse' is not assignable to parameter of type 'SetStateAction'. < database >. Oct 10, 2023 · In the code, the encoding is specified and it is clear content variable is a string type. Jun 15, 2017 · is not assignable to parameter of type 'Expected<Promise<string>>' in editor Asked 8 years, 2 months ago Modified 4 years, 2 months ago Viewed 31k times (property) React. Type 'FormEvent<HTMLFormElement>' has no properties in common with type 'TicketFullDTO'. Type 'void' is not assignable to type 'SetStateAction'. I have code written below in three files, which works fine when compiled and run. Dec 11, 2021 · Type 'string' is not assignable to type 'LoadChildrenCallback Asked 3 years, 11 months ago Modified 2 years, 6 months ago Viewed 26k times Feb 3, 2022 · I'm new to TypeScript and I'm currently stuck. If it contains a string, it isn't valid to pass to the function, as the function only wants ArrayBuffer arguments. ts (1390, 9): The expected type comes from property 'onSubmit' which is declared here on type 'DetailedHTMLProps TypeScript - TypeScript中复杂的“is not assignable to type”错误的解释 在本文中，我们将介绍TypeScript中会出现的复杂的“is not assignable to type”错误，并提供解释和示例说明。 阅读更多：TypeScript 教程 引言 在使用TypeScript进行开发时，我们经常会遇到各种类型错误。 May 24, 2023 · Im passing a function is props and adding it in onClick of button element but it shows below error Type ' (closed: string) => void' is not assignable to type 'MouseEventHandler<HTMLButtonElement>'. Docs Credentials provider NextAuth with typescript/extend interface Content specific to Angular. #24413 Jan 15, 2024 · The core issue is not with the React typings, but instead with how dependencies are represented in Typescript. As part of my learning in tests with Jest and TypeScript, I'm getting the error in the title, in the terminal, and the following test fails with an error code TS2345. ts(2322) Or we can widen theme out even further and make theme into a string here. Any fix for this issue please? Thanks. In my case, I had an older transient version of vite still installed in my node_modules as a transient dependency. The string parameter is given in the example code to maintain the idea that the function may have Jul 26, 2023 · I have this error in console when trying to build my project: May 19, 2023 · Argument of type '{ mutationFn: (authToken: string, placeId: string, listIds: string[]) => Promise<any>; onSuccess: () => Promise<void>; onSettled: () => Promise<void>; }' is not assignable to parameter of type 'MutationKey'. below is the package. 8. Type '{}' is missing the following properties from type 'HTMLImageElement': align, alt, border, complete, and 262 more. Example: let wrongTypeInstance: any = { prop1: 'Hello', I tried this method with mockReturnValueOnce and got: Argument of type ' { data: string; }' is not assignable to parameter of type 'Promise<unknown>'. Press space again to drop the item in its new position, or press escape to cancel. While dragging, use the arrow keys to move the item. ts(6, 5): The expected type comes from property children which is declared here on type IntrinsicAttributes & Children Any ideas on how to solve the type mismatch? Argument of type ' (data: any) => Promise<AxiosResponse<any>>' is not assignable to parameter of type 'MutationKey'. Dec 1, 2019 · Often the typescript error that I get reads: Argument of type 'string' is not assignable to parameter of type 'SetStateAction<undefined>'. Sep 9, 2021 · In my react app, I m trying to import the img source, but getting any error as TS2322: Type 'Promise<any>' is not assignable to type 'string'. Oct 23, 2022 · Bug description For some reason i'm getting the Type 'string' is not assignable to type 'never' error, but the variables are with same tipe (string) How to reproduce prisma. for the checkUserLoggedIn() call in useEffect. I don't think it "defies all logic" May 3, 2021 · Type 'Promise<void>' is not assignable to type 'MouseEventHandler<HTMLButtonElement> Asked 4 years, 6 months ago Modified 3 years, 1 month ago Viewed 16k times Jun 24, 2020 · Argument of type '(payload: Partial<CreateReviewPayload>) => Promise<{ id: string; data: Review; }>' is not assignable to parameter of type '(args: any[]) => CanReturnChainable'. Jul 10, 2020 · test is then assigned to ttt, but it's not compatible to have a possibly undefined b key in the new interface t. js when I encountered yet another error:. js 14 (latest) with app router, especially with my formAction. Dec 16, 2022 · I’ve been using useEffect hooks heavily since React introduced them in version 16. 6 as far as I can tell. What is the proper use of generics to fix this error? Mar 10, 2019 · There's a problem with getActualId, though, and if we fix that we don't need a type annotation on id in getId: getActualId is missing its return type annotation, so it implicitly returns Promise<any>. Jun 26, 2019 · TS can't currently infer the type parameter of Promise from the resolve() call and therefore defaults to Promise<{}>; {} being close to a top type, is not directly assignable to anything. Oct 24, 2021 · TS2322: Type ' (data: TicketFullDTO) => Promise<void>' is not assignable to type 'FormEventHandler<HTMLFormElement>'. Jan 29, 2020 · Type '{}' is not assignable to type 'IntrinsicAttributes & IntrinsicClassAttributes' I don't know what's going on. Type 'string | number | symbol' is not assignable to type 'keyof T2'. Element) | ComponentClass<never, any> | FunctionComponent<never> | { default: ComponentType<never>; }>' is not assignable to parameter of type 'DynamicOptions<{}> | Loader<{}>'. Issue still in 2. Sep 15, 2022 · Type 'Promise<any>' is not assignable to type 'LoaderFunction'. Nov 22, 2023 · This Stack Overflow post discusses the error "Next action is not assignable to type string" and provides solutions for resolving it. Apr 27, 2022 · Type 'string' is not assignable to type 'T[keyof T]' If T is a Record of string keys and string values and prop is a key of T, then I originally assumed that I could assign a string to T[keyof T]. Response<any, Record<string, any>> | undefined>' is not assignable to parameter of type 'Application<Record<string, any>>'. So, when inferring from Promise<XXX> to Promise<T | U> we ought to make a lower priority inference of XXX to both T Oct 23, 2020 · Argument of type 'Promise<any>' is not assignable to parameter of type 'string' Asked 5 years, 1 month ago Modified 5 years, 1 month ago Viewed 8k times Type Promise<string> is not assignable to type AttributeValue | undefined elements. Promises have a special syntax that allows promises to be daisy-chained together, allowing the results from one promise to feed the next promise. would like to provide any other details. ts(13, 5): The expected type comes from property 'authorize' which is declared here on type 'UserCredentialsConfig<{ email: { label: string; type: string; }; password: { label: string; type: string; }; }>' I added this type definition to types/next-auth. . the following snippet (see the example) errors: import type { ReactNode } from "react"; function Pa May 9, 2017 · Type Promise<void> is not assignable to type Promise<customType []> Asked 8 years, 6 months ago Modified 8 years, 6 months ago Viewed 54k times Jan 21, 2019 · No it is not. Type 'Element' is not assignable to type 'ReactPortal'. By following the tips outlined in this post, you can effectively troubleshoot this error and improve the type safety of your codebase. Type assertions should be carefully considered and used sparingly. What causes the error? Jul 3, 2024 · Running into the TypeScript error "Type undefined is not assignable to type string"? It's a frequent error when variables might be undefined but functions demand strings. Upvoting indicates when questions and answers are useful. Types of parameters 'data' and 'event' are incompatible. ts (2322) 'I 解决 ‘Promise< {}>’ is not assignable to ‘Promise ‘ 错误 当我们试图把 Promise< {}> 类型的值赋给 Promise 类型的变量时，TypeScript 会报错，提示类型不兼容。 Oct 29, 2022 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, Jan 8, 2024 · Since TypeScript doesn't guarantee that the key will always exist, it's not providing comprehensive type safety and it’s not helping us to ensure our types through our application. Apr 18, 2024 · Assignable to type ReactNode means that the value must be compatible with the ReactNode type, which is a cornerstone of React's type system. Promise<string>' is not assignable to type 'Promise<string>' I am confused with the output and need some some inputs from you regarding the issue. Type 'keyof T2' is not assignable to type 'keyof T2'. href?: string | undefined Type 'Promise' is not assignable to type 'string'. I try to use JSDocs with TS compiler in VSCode. Types of property 'user' are incompatible. Jul 22, 2025 · この「Type 'string' is not assignable to type 'Fruit'」というエラーは、まさに「"Grape" はただの文字列であって、 "Orange" か "Apple" か "Banana" じゃないからダメだよ！」とTypeScriptが教えてくれているんです。TypeScriptは、あらかじめ定義された型に合わないデータが使われることを防ぎ、バグを未然に防いで Oct 11, 2021 · Argument of type ' (response: AxiosResponse) => Promise' is not assignable to parameter of type ' (value: AxiosResponse<unknown, any>) => unknown'. Could you please help me? I've got really no ideas how to fix. We have also discussed some common mistakes that can lead to errors about type is not assignable to type reactnode. It provides a type Dec 3, 2023 · I have this data that I get from the formData and I want it to pass for the function for sending an email. Jul 17, 2022 · Type 'Promise<string>' is not assignable to type 'string' Asked 3 years, 4 months ago Modified 3 years, 4 months ago Viewed 13k times May 13, 2023 · Type 'Promise<any>' is not assignable to type 'string' Asked 2 years, 6 months ago Modified 2 years, 6 months ago Viewed 3k times Nov 21, 2017 · The most common case would be Promise<string> getting mixed up with a rejection string. Apr 23, 2023 · Argument of type '(req: Request, res: Response, next: NextFunction) => void' is not assignable to parameter of type 'Application<Record<string, any>>'. Here is a scenario that i saw. This leaves TypeScript to infer the generic type from the arguments given. Two different types with this name exist, but they are unrelated. Sorry if this is a dumb question, but I'm new to typescript and these type errors, and I can't figure out what the fix is. Jan 21, 2023 · Of course that doesn't work; R is still inferred as string from the onfullfilled callback, and with E of number, the return type is Promise<string | number> which is not assignable to Promise<number>, and you get the error Argument of type 'Promise<unknown>' is not assignable to parameter of type 'void'. I can get rid of it by doing const checkUserLoggedIn:any However Argument of type 'Promise<unknown>' is not assignable to parameter of type 'void'. Oct 16, 2023 · Type ‘Promise<false | User>’ is not assignable to type ‘Awaitable<string | boolean>’. Sep 16, 2021 · I'm new react typescript developer, here i have a code which works in 'js' 'but when changed to 'tsx' getting error: Type 'Element' is not assignable to type 'string'. S this is a JS file, not typescript. ts (2322) defini Jul 5, 2024 · Summary Hi community. Types of parameters 'res' and 'resp' are incompatible. You need to tell this component what type of state it's going to hold. How can I fix this issue and prevent TS from complaining? P. Jul 1, 2024 · Summary i am still unclear how to correctly type the return type of async components in react 19. Oct 8, 2018 · [ts] Type 'Promise<any[]>' is not assignable to type 'MeetingAttributeRecords'. Element>; propTypes: {}; }' is not assignable to type 'ComponentClass<any, any> | FunctionComponent<any> | ComponentClass<RouteComponentProps Apr 6, 2021 · "Type 'boolean' is not assignable to type 'Promise'", typically occurs when you have a function or code that is expected to return a Promise, but you're returning a plain boolean value instead. Feb 29, 2024 · A step-by-step guide on how to solve the error "Argument of type string | undefined is not assignable to parameter of type string". This is because we have set number as the return type for all three methods. Mar 4, 2022 · A type is a set of possible values. If you're looking for AngularJS or Angular 1 related information, check out r/AngularJS. May 11, 2025 · Type 'Promise<Response<any, Record<string, any>> | undefined>' is not assignable to type 'void | Promise<void>'. Oct 25, 2020 · Argument of type '(username: string, password: string) => Promise<CognitoUser>' is not assignable to parameter of type 'MutationFunction<CognitoUser, string>' Jul 7, 2021 · Argument of type '() => Promise<(({ inline }: Props) => JSX. May 29, 2024 · [Error] Type ‘Promise< { userName: string; }>’ is not assignable to type ‘Promise< (Document<unknown…. When I have done like this before everything have been working fine but when I did it today I get the errors: Type 'Element' is not assignable to type 'ReactNode'. Feb 24, 2019 · Types of parameters 'property' and 'property' are incompatible. e. A way to think of Effect hooks is like React lifecycle method (componentDidMount, componentDidUpdate, componentDWillUnmount) bundled into one function, or hook as React defines it to perform side effects in function components. In this case, it's an array of IContactCardProps, so your state declaration should look like: useState<IContactCardProps[]>([]); However, in your code, that doesn't look like what you're doing and why you're seeing that error). Type '(email: string, password: string) => Promise<UserCredential>' is missing the following properties from type 'PromiseConstructor': all, race, reject, resolve, and 3 more. 2 - thx changkun for the workaround :-) Feb 4, 2025 · When working with TypeScript, you might encounter an error that says 'Type string is not assignable to type'. ts(2345) The TypeScript error typically occurs from my understanding when we are trying to set the initial state of a useState hook without specifying a proper initial type. The Awaited utility type is used to recursively unwrap Promises and get their return type. Error: Type 'FormDataEntryValue' is not assignable to type 'string | null'. TypeScript doesn't know that you later want to set a string into state here. create is asynchronous then you can use mockImplementation(()=> Promise. ts(2322) it is pointing to ' Oct 16, 2022 · Type '{ id: string; address: string; name: string | null; }' is not assignable to type 'User'. Does anyone have insight into this? Let me know if there are any other details you need! Feb 27, 2024 · The function above returns a Promise that contains an array of objects of type Person. And problem this the check () function. The only thing that changes is the type checker behavior, which becomes a little bit more strict as you enable more checking options in your tsconfig. ReactPortal & React. I have a nodejs and express app. What's reputation and how do I get it? Instead, you can save this post to reference later. It represents any node that can be rendered in a React application, including elements, text, and Mar 13, 2019 · I'm trying to learn React with TypeScript, and I seem to keep running into TS errors that are a bit vague. Jan 2, 2024 · // Type 'ReactElement<any, string | JSXElementConstructor<any>>' is not assignable to type 'ReactNode'. The problem is the value promise has type 'Promise<{}>' but I can't seem to get it to have type Promise<HTMLImageElement | never> however I try! May 12, 2018 · Type '{ provide: string; useFactory: () => Promise<any>; }[]' is not assignable to type 'FactoryProvider'. Type 'User' is not assignable to type 'AdapterUser'. Sep 8, 2021 · Type 'CredentialsConfig<{ username: { label: string; type: string; }; password: { label: string; type: string; }; }>' is not assignable to type 'CredentialsConfig<{}>'. Nov 27, 2020 · Argument of type ' (data: Params) => Promise' is not assignable to parameter of type 'MutationFunction<Response, undefined>'. Property 'provide' is missing in type '{ provide: string; useFactory: () => Promise<any>; }[]'. If you set it to object the you get the error since the argument to the callback are not compatible with object. Aug 14, 2023 · I have created a React app with Typescript with npm create vite@latest. Nov 13, 2020 · Type 'Promise<{ json: () => Promise<{ test: number; }>; }>' is not assignable to type 'Promise<Response>'. strings: Sep 12, 2022 · Type 'ResolveIdHook' is not assignable to type 'ObjectHook<(this: PluginContext, source: string, importer: string | undefined, options: { custom?: CustomPluginOptions | undefined; ssr?: boolean | undefined; isEntry: boolean; }) => ResolveIdResult | Promise<>, {}> | undefined'. #9268 Closed Answered by arthtyagi arthtyagi asked this question in Q&A Form action not working I have a server component where im importing a server action which i want to call when a form is submitted using the form's action prop, however im getting: Type '(taskData: FormData) => Promise<void>' is not assignable to type 'string'. getmemberheader, you should retrieve result of promise at its then callback instead (not assigning promise itself to array doughnutChartLabels). Type '{ json: () => Promise<{ test: number; }>; }' is missing the following properties from type 'Response': headers, ok, redirected, status, and 11 more. But TS complains as Argument of type 'Promise<string | Buffer>' is not assignable to parameter of type 'string'. However, we need to mention one complication that's specific to Execute Program. powysbkyehitthpfmckiisqyrnvandxsfbmxcyfrclcmmvdxfyrohkztcjvkuytsbwtswzwitzckj