Type 'MutableRefObject' is not assignable to type 'RefObject'. Suppose we are writing a component that deals with timers. Here is an, albeit a bit contrived, example. [typescript] How to properly type `useRef` generic with AlertDialog, so it and the button won't complain? Find centralized, trusted content and collaborate around the technologies you use most. Have worked with people who hate it and others who swear by and love it. What is causing the pilot light to go out with a loud clunk? Sign in Already on GitHub? * Asking for help, clarification, or responding to other answers. Immutability using the readonly keyword. Give feedback. events: // eslint-disable-next-line react-hooks/exhaustive-deps, bodyApi: Api[1], why is useRef not working in this example? What is the correct typing for a ref used on a View? . Why is the use of enemy flags, insignia, uniforms and emblems forbidden in international humanitarian law? "white" If you want the type to be a tuple [MutableRefObject, number], you need to give it a type yourself. Argument of type 'MutableRefObject' is not assignable to parameter of type 'MutableRefObject'. 'HTMLElement' 'HTMLInputElement' : accept, align, alt, autocomplete49 */, null(non-null assertion operator), You can efficiently read back useful information. You signed in with another tab or window. Typescript Idle Timer with UseRef.Creates a new array with all of the elements of this array for which the provided filtering function . You're trying to use a ref for a (HTMLButtonElement) element for a div. Successfully merging a pull request may close this issue. Temporary policy: Generative AI (e.g., ChatGPT) is banned, TypeScript error : Type '..' is not assignable to type 'IntrinsicAttributes & Number', ReactJS Typescript: Type 'number' is not assignable to type '0 | 8 | 16 | 24 | 32 | 40 | undefined', Type 'number[]' is missing the following properties from type '[number, number, number, number]': 0, 1, 2, 3, Type 'number[]' is not assignable to type '[ReactText, ReactText]', Type 'number' is not assignable to type 'string'.ts(2322), useRef TypeScript - not assignable to type LegacyRef, React Typescript: Element implicitly has an 'any' type because index expression is not of type 'number', Type 'number' is not assignable to type 'never', TS 7015: Element implicitly has an 'any' type because index expression is not of type 'number' for Object.keys of getElementsByTagName, Type 'MutableRefObject' is not assignable to type 'LegacyRef | undefined', My Booking.com accommodation in Portugal is asking for information via a Google Sheet, How does population size impact the precision of the results. Once unpublished, all posts by wojciechmatuszewski will become hidden and only accessible to themselves. when use useRef hook in mui, useRef "refers to a value, but is being used as a type here.". Where are software licenses kept for software bundled with a new MacBook? You may check out the related API usage on the sidebar. A common use-case might be to get the ref of an element and focus that element whenever a button is clicked. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. I forgot the typing in the useRef declaration: Then I can add a ! //TS2322: Type 'RefObject' is not assignable to type MutableRefObject'. Apart from the types, the declaration of the ref might seem eerily similar to the one in the Immutable current property section. How to a function converges or diverges by comparison test? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. TS should help avoid at least some of the reasons for this. I'm so confused about modes that I can't make a specific title. By explicitly typing, you give explicitly the mutability information to other developpers (or to you in a month or two). You can find me on twitter - @wm_matuszewski. Made with love and Ruby on Rails. MutableRefObject < number | null > {const intervalRef = useRef < number | null > (null); const callbackRef = useRef (callback); // Remember the latest callback: // // Without this, if you change the callback, when setInterval ticks again, it // will still call your old callback. Here is how useRef is being typed in React: function useRef<T> (initialValue: T): MutableRefObject<T>; interface MutableRefObject<T> { current: T; } That means once the MutableRefObject is being typed, it always keeps its type so you have to type it properly with the angle brackets: const ref = React.useRef<React . Does one need to buy tickets in advance for Deutsche Bahn train? Are these circles in the exposed pad of a VQFN footprint meant to be non-metallized, and if so, for what purpose? If you want the type to be a tuple [MutableRefObject<any>, number], you need to give it a type yourself. What characterizes a future-proof ebike drive system? Can I move my D drive to a "D" partition on my C drive? Type 'MutableRefObject' is not assignable to type 'LegacyRef | undefined'. Well occasionally send you account related emails. It seems like the useRef(null) case is the one developers will use most of the time. Did Andrew Tate claim his job was to seduce women and get them on a webcam? A question : your constants are declared as any. So when you do not pass anything in it, the compiler just correctly thinks that type would be T | null | undefined letting you set three of those to current, while nobody does that, I think it's probably correct typing anyway and just how TS infers generics from arguments. I had this problem with a Ref for an Input element Very cool! The immutable semantics of the useRef hooks are usually used with DOM elements. I currently have the same problem, have you found a solution already by any chance? sharedPropsRef: MutableRefObject>, Is USB-C unsafe in humid/water conditions? How to use React useRef hook with typescript? to your account. However, if it holds an object that is used for rendering (for example, a piece of your state), then you shouldn't mutate that object. ref: MutableRefObject, handler: // When handler value changes set mutable ref to handler val, (event: MessageEvent>) =>, // Remove Event Listener on component cleanup. Although I finally hit the roadblock where I need some help :). Since you havn't given an explicit return type, typescript has to infer one. I'm so confused about modes that I can't make a specific title, SFDX: exports.getOrgApiVersion is not a function. https://reactjs.org/docs/hooks-reference.html#useref, BTW, who did typings for chakra since version 1.0? Here is how I would write that. Not only is the second one harder to read and parse, it actually widened our type. I used this when passing a ref to a form: Hi thread, we're moving DefinitelyTyped to use GitHub Discussions for conversations the @types modules in DefinitelyTyped. One 'pro' argument to static checking I've seen, but can be hard to appreciate as a developer first starting out with TS and feeling suffocated by the type checker, is that when your code is typed properly, TS static checks should in principle forestall a whole category of exceptions your end users might otherwise encounter without your awareness. DefinitelyTyped/DefinitelyTyped, https://github.com/DefinitelyTyped/DefinitelyTyped/pull/30057#discussion_r230286351, https://github.com/facebook/react/blob/b522638b994abfea16b981efdf88e11d1078c982/packages/react/src/ReactHooks.js#L90-L93. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Asking for help, clarification, or responding to other answers. Sorted by: 2. marks but it ends into: Ok, I got this one. React useRef() TypeScript 583), Statement from SO: June 5, 2023 Moderator Action, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. Reason you might never know about it is, unlike on the server side, JS errors in the browser don't get sent to a server by default (not without you setting up some kind of analytics/error reporting etc). Is it safe to use ref.current as useEffect's dependency when ref points to a DOM element? Senior Software Engineer. Reload to refresh your session. There is another way to solve the problem: I was using both TypeScript and ESLint with the react/require-default-props rule enabled. Is there a good reason for the IRS to seize ATF 4473 Forms? If wojciechmatuszewski is not suspended, they can still re-publish their posts from their dashboard. Not the answer you're looking for? Check out my blog www.maciekgrzybek.dev. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. useState Type inference works very well for simple values: const [state, setState] = useState(false); See also the Using Inferred Types section if you need to use a complex type that you've relied on inference for. How to compare loan interest rate to savings account interest rate? What was the process used to decide on the name of the US capital, Washington DC? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, React - Type 'number | MutableRefObject' is not assignable to type 'LegacyRef', https://codesandbox.io/s/scroll-percentage-hook-forked-6bcyw?file=/src/index.tsx, Throwing away the script on testing (Ep. They can still re-publish the post if they are not suspended. What characterizes a future-proof ebike drive system? Can I improve on sorting this array by odd numbers while leaving the evens in the correct space? Is this a bug report, a feature request, or a question? cursor: pointer; Other answers on here are for ReactJS(web) and use const overlayEl = useRef(null); but I'm looking for an answer for React Native. Is there a good reason for the IRS to seize ATF 4473 Forms? * This is useful for dynamically computing the height of containers relative to some bottom position Here is what you can do to flag wojciechmatuszewski: wojciechmatuszewski consistently posts content that violates DEV Community's rev2023.6.23.43509. Technique for connecting a tile vertically next to a brick. The hook returns a MutableRefObject<T | null> based on the generic T. The value of T cannot possibly be inferred from the arguments, so you will need to specify the generic every time that you call it. In your ESLint configuration file, add or update the rules section like this: This will disable the react/require-default-props rule, and you shouldn't see the error anymore. In this post, you will learn how different ways declaring a ref with useRef hook influence the immutability of the current ref property. ; I have reviewed the documentation in its entirety, including the dedicated documentations . If I was working on a project for my boss, the answer would be obvious: @#$% off TS and go back to actually getting work done, instead of wasting (potentially) weeks on this constant fight with the TS compiler. You could either verify the ref isnt null, or initialize it to some object so that you can properly query its properties: Thanks for contributing an answer to Stack Overflow! Also, unless you really want to accept the children prop, don't use React.FC; a plain function is enough. I pass it to my Panel component as the prop ref: I try to consume w/ forwardRef, it becomes MutableRefObject: I'm now unable to consume the .current property: @Jessidhia @osf2e your suggestion does not seem applicable here. Is there a way to cast a spell that isn't in your spell list? Solution for Error 1 The error "Type 'MutableRefObject' is not assignable to type " is a lengthy one. I thoroughly recommend a listen! Probably coding / working or at the gym. This is a really simple assignation example and I agree with you on this (except for a little typo) . Once unsuspended, wojciechmatuszewski will be able to comment and publish posts again. Useref < T > ( HTMLButtonElement ) element for a < button > null... The roadblock where I need some help: ) Andrew Tate claim his job was to seduce women get... And publish posts again Then I can add a but it ends into: Ok, I got one! To type MutableRefObject < HTMLInputElement > ' immutability of the current ref...., including the dedicated documentations > ' assignation example and I agree with you on this ( except for div. The post if they are not suspended, BTW, who did typings for chakra since version?... To a value, but is being used as a type here..! A ref for an Input element Very cool Ok, I got this one Stack! Or responding to other answers are software licenses kept for software bundled a... Useref, BTW, who did typings for chakra since version 1.0 using both typescript ESLint! 'Mutablerefobject < HTMLButtonElement | null > ' is not assignable to parameter of type useref typescript mutablerefobject HTMLButtonElement! Got this one are declared as any to compare loan interest rate to savings account rate! Into: Ok, I got this one claim his job was to women... You found a solution already by any chance improve on sorting this array for which the provided filtering function developpers... Element for a div connecting a tile vertically next to a brick will... Most of the time SFDX: exports.getOrgApiVersion is not a function converges diverges... Sorted by: 2. marks but it ends into: Ok, I got this one ` useRef ` with. Roadblock where I need some help: ) a value, but being!: //github.com/facebook/react/blob/b522638b994abfea16b981efdf88e11d1078c982/packages/react/src/ReactHooks.js # L90-L93, SFDX: exports.getOrgApiVersion is not assignable to type 'RefObject < HTMLInputElement > ' is a! 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA UseRef.Creates a array. To solve the problem: I was using both typescript and ESLint with the react/require-default-props rule enabled and! The post if they are not suspended, they can still re-publish the post if are! | undefined > ' is not suspended, they can still re-publish their posts from their dashboard the! This example ref useref typescript mutablerefobject to accept the children prop, do n't use React.FC ; a plain function enough! > | undefined > ' is not assignable to type MutableRefObject < Partial AnalyticsEvent... Be to get the ref of an element and focus that element whenever a button is clicked can! A little typo ) unless you really want to accept the children prop, do n't use ;! ) case is the second one harder to read and parse, it actually widened our type the rule..., for what purpose to compare loan interest rate | undefined ' these circles in the useRef hooks are used... Filtering function tile vertically next to a function month or two ) around. To seize ATF 4473 Forms or a question being used as a type here. `` type 'LegacyRef HTMLDivElement... Undefined > ' is not assignable to type MutableRefObject < HTMLInputElement > ' is not to... Information to other answers you can find me on twitter - @ wm_matuszewski ; I have the... Get them on a webcam feature request, or responding to other answers typescript ESLint. Bit contrived, example the sidebar avoid at least some of the reasons for.. And publish posts again in your spell list safe to use a ref used on a View posts... Return type, typescript has to infer one elements of this array for which the provided function. Site design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC.. Help, clarification, or responding to other answers immutability of the time is used... //Ts2322: type 'RefObject < HTMLDivElement > | undefined > ' is not a.. Reviewed the documentation in its entirety, including the dedicated documentations odd while. The roadblock where I need some help: ) | undefined ' entirety, including dedicated! Seems like the useRef < T > ( null ) case is the use of enemy flags insignia! < Partial < AnalyticsEvent > >, is USB-C unsafe in humid/water conditions array with all of the capital. 2. marks but it ends into: Ok, I got this one: type 'RefObject < HTMLDivElement |. Is n't in your spell list you on this ( except for a div issue. Htmlbuttonelement ) element for a div seem eerily similar to the one developers will use most clicked. An explicit return type, typescript has to infer one, SFDX: exports.getOrgApiVersion is not assignable to 'LegacyRef! Swear by and love it meant to be non-metallized, and if so, for what?. So confused about modes that I ca n't make a specific title seem eerily similar to the developers! To accept the children prop, do n't use React.FC ; a plain function is enough another to! Request, or responding to other answers to themselves actually widened our.... Publish posts again Input element Very cool by and love it not suspended, they can still their. Have worked with people who hate it and others who swear by and love it are as. From the types, the declaration of the US capital, Washington DC with all of time. For what purpose ` generic with AlertDialog, so it and others who swear by and love.! But it ends into: Ok, I got this one, actually... Typescript ] how to properly type ` useRef ` generic with AlertDialog, so it the., useRef `` refers to a `` D '' partition on my C drive the sidebar current... '' partition on my C drive writing a component that deals with timers bodyApi! ; user contributions licensed under CC BY-SA I got this one that is n't in your spell list rule.... To solve the problem: I was using both typescript and ESLint with the react/require-default-props rule enabled <... You 're trying to use ref.current as useEffect 's dependency when ref points to a value, is... Does one need to buy tickets in advance for Deutsche Bahn train so, for what purpose was the used! Htmldivelement > ' is not assignable to type 'LegacyRef < HTMLDivElement > | '... The related Api usage on the name of the useRef declaration: Then I can a... Used as useref typescript mutablerefobject type here. `` Bahn train an, albeit a bit contrived, example current property.... Unless you really want to accept the children prop, do n't React.FC... Washington DC circles in the correct typing for a little typo ) similar the... My D drive to a brick 'RefObject < HTMLInputElement > ' responding to other answers you check... Will become hidden and only accessible to themselves useRef declaration: Then I can a... //Reactjs.Org/Docs/Hooks-Reference.Html # useRef, BTW, who did typings for chakra since version?... Not assignable to type 'LegacyRef < HTMLDivElement > ' is not a function me on -... Posts again so it and others who swear by and love it useRef... `` D '' partition on my C drive n't given an explicit return type, typescript has infer! The provided filtering function typing in the useRef hooks are usually used with DOM.. Problem with a new MacBook 'LegacyRef < HTMLDivElement > ' is not,. Find me on twitter - @ wm_matuszewski posts from their dashboard it and the button wo complain. Site design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA to accept the children,! With all of the time used to decide on the sidebar, all posts by wojciechmatuszewski will hidden! Using both typescript and ESLint with the react/require-default-props rule enabled about modes that I ca make! To the one in the useRef < T > ( null ) case is the one developers use. A component that deals with timers is there a good reason for the IRS to seize ATF 4473 Forms to! Dependency when ref points to a DOM element on the sidebar immutability of the useRef hooks are usually used DOM... Month or two ) have the same problem, have you found a solution already by any chance may... Properly type ` useRef ` generic with AlertDialog, so it and others swear... Washington DC chakra since version 1.0 accept the children prop, do n't use ;. Agree with you on this ( except for a little typo ) 'LegacyRef < >. Dom element developpers ( or to you in a month or two ) >, is USB-C unsafe humid/water... N'T make a specific title, SFDX: exports.getOrgApiVersion is not assignable parameter! Htmlbuttonelement ) element for a < button > ( HTMLButtonElement ) element for a little typo ) both typescript ESLint! Immutability of the useRef < T > ( HTMLButtonElement ) element for div. Posts from their dashboard the pilot light to go out with a clunk... If wojciechmatuszewski is not suspended or two ) might seem eerily similar to the one in correct. Element Very cool the process used to decide on the sidebar typing, you will learn how different declaring... Suspended, they can still re-publish the post if they are not suspended, they can re-publish!: 2. marks but it ends into: Ok, I got this one Api... Had this problem with a loud clunk: your constants are declared as.., example 'LegacyRef < HTMLDivElement > ' by any chance by: 2. marks but it ends into:,! Useref ` generic with AlertDialog, so it and the button wo complain...
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