Typescript react ref object is possibly null My hooks are look like this: const… Apr 7, 2024 · A React ref most commonly returns undefined or null when we try to access its current property before its corresponding DOM element is rendered. Using the same code as their docs' example, I get Object is possibly 'null' error in the focusEditor function. RefObject. But it is generally not possible to use the same approach for setting a value on a possible null object. refreshRate = RenderTargetTexture. 'possibleNullObj?. TypeScript 如何解决 “Object is possibly null” 错误 在本文中，我们将介绍如何解决 TypeScript 中出现的 “Object is possibly null” 错误。这个错误是由于 TypeScript 的类型推断机制导致的，当我们使用某个变量的属性或方法时，如果 TypeScript 认为该变量可能为 null 或 undefined，就会出现这个错误。 阅读更多 TypeScript Ref对象可能未定义的问题 在本文中，我们将介绍在使用TypeScript和React开发时遇到的一个常见问题，即Ref对象可能未定义的情况，并提供解决方案和示例代码。 阅读更多：TypeScript 教程 问题描述 在React组件开发中，我们经常使用Ref对象来获取组件的DOM节点或自定义对象。在TypeScript中，Ref对象 . current is null because the ref is not set till after the function returns and the content is rendered. Feb 10, 2021 · Object is possibly 'null': TypeScript, React useRef & Formik innerRef Asked 4 years, 7 months ago Modified 1 year, 4 months ago Viewed 9k times Feb 16, 2020 · What cheatsheet is this about? (if applicable) How to use typescript and useRef What's your issue or idea? import React, { useEffect, useRef } from 'react' export default function() { const myRef = Oct 12, 2021 · Thanks for your answer, I understand what you are saying, but I have a condition before the return statement, that does check if materials. Ref. data inside array. useRef<HTMLD I am trying to make a typescript + react fileinput component. attribute'. Jun 12, 2021 · Learn how different ways of instantiating useRef influence the ref mutability. target. Dec 6, 2023 · Excessive use of Non-null assertion operator While the non-null assertion operator is a handy tool, excessive use of it defeats the purpose of TypeScript's strict null checks. Apr 15, 2024 · All scenarios in this article are under tsconfig. One of the potential errors that a developer might encounter is the TypeScript " object is possibly null" error. Feb 27, 2021 · I'm changing a React component to Typescript. getElementById () to access something results in the error: Type error: Object is possibly 'null'. Dec 26, 2020 · When the React useRef() hook is initialized with null, TypeScript may complain that " Object is possibly 'null' " when trying to access the current property on the reference object. Aug 26, 2025 · Discover how to effectively type the useRef hook in TypeScript for React applications that require imperative DOM manipulation. # Use a type guard to solve the error Aug 15, 2023 · The "useRef Object is possibly null" error usually happens when TypeScript can't guarantee that a variable or object will not be null or undefined at runtime. Using window. ts (2531) at TypeScript is a language for application-scale JavaScript development. log(x)); } however on the nativeElement. May 8, 2025 · I'm trying to use a ref to an input element, and then use inputRef. Learn best practices, common pitfalls, and practical examples, such as controlling the focus state of an input element. Feb 29, 2024 · The error "Object is possibly 'null'" occurs when we try to access a property on an object that may have a value of `null`. you can use exclamation mark (!) before the variable you know that it can be null. ts (2531) Asked 4 years, 11 months ago Modified 4 years, 11 months ago Viewed 2k times Feb 26, 2019 · For others facing a similar problem to mine, where you know a particular object property cannot be null, you can use the non-null assertion operator (!) after the item in question. Nov 26, 2020 · Learning Vue Composition API (and TypeScript), from the docs I found, I should be using ref (null) to use by a sub component I have inside <template></template>. createRef () is asynchronous so if you try to access the ref in componentDidMount, it will return null and later return the properties of the component in which you are referencing. A community for discussing anything related to the React UI framework and its ecosystem. MutableRefObject AND the initial value to be null, the simple trick is to simply define it as: Aug 19, 2020 · Typescript/React useRef Error: (property) React. value to get its value but I'm getting an error Object is possibly 'null'. If you want it to be React. I then put the elementRef variable inside the ref property of my div element. TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. Sep 2, 2022 · // <a> reference type const linkRef = React. This is important because useRef can only be null, or the element object. useRef<HTMLLinkElement>(null); When you create a invoke a useRef hook, it’s important to pass null as the default value. Dec 9, 2021 · TypeScript : Object is possibly 'null' useRef Asked 3 years, 9 months ago Modified 3 years, 9 months ago Viewed 6k times Jan 24, 2020 · Ref object is possibly undefined TypeScript React Asked 5 years, 9 months ago Modified 1 year, 8 months ago Viewed 52k times I'm new to react and typescript and am fighting the "Object is possibly null" error in my useEffect function. document. const ref = useRef(null) as any; Edit: I wanted to come back and give a more strongly typed solution, but Sakshi's answer does just that. TypeScript で useRef を使おうとすると初期値に null を渡していることもあり useEffect の中で Object is possibly 'null'. Join the Reactiflux Discord (reactiflux. Tagged with typescript, react, webdev, hooks. Dec 23, 2024 · Provide a general summary of the issue here In React 19 useRef and references in general have been refactored. Feb 6, 2021 · The exclamation mark after null tells typescript that it is meant to be initial value and the value will most possibly change. Feb 29, 2024 · The error "Cannot assign to current because it is a read-only property" occurs when a ref's value is set to null without including null in its type. subscribe(x => console. com) for additional React discussion and help. Aug 29, 2020 · Passing refs on React Native with TypeScript: (property) React. current: HTMLFormElement | null Object is possibly 'null'. I want to use useRef hooks with typescript but in my every hooks throws that error: Object is possibly 'null'. scrollTo (0, 0) を要素に適用したかったのだがタイトルの通りとなった Dec 10, 2019 · I'm trying to convert a react project into TypeScript. It also shows no problem when it is inside top-level JSX tags, but when I use materials. TypeScript is smart enough to see that you're not performing any validation before using a potential null object, i. Aug 5, 2018 · React. What Causes the Object Is Possibly ‘Undefined’? Object is possibly ‘undefined’ can be caused because of undeclared or uninitialized variable in your code, type coercion error, reference error, wrong property or method reference in your code, turned on TypeScript strict null checks feature, or ignorance of TypeScript compiler error. map function , then the problem occurs. Jan 30, 2020 · I have similar problem to this thread, using Draft. This error is important for ensuring type safety and preventing runtime errors related to null or undefined values. How do I fix the two errors in the Parent below? Related to ' object is possibly null ' compile error, if you want to disable this checking in your typescript configuration, you should add the below line in the tsconfig. _shadowEmitter. Indeed, code written in TypeScript is checked for error before it is executed, saving development and debugging time. Dec 1, 2021 · Well useRef(null) effectively returns a ref which has a null current property, TypeScript warns you about it before you execute the code so you have to adapt it with a null check or an optional chaining operator just like you did Apr 15, 2024 · All scenarios in this article are under tsconfig. The code below is an input field that counts how many characters that is being inputed. Aug 17, 2023 · The “useRef Object is probably null” error normally occurs when TypeScript cannot assure {that a} variable or object is not going to be null or undefined at runtime. REFRESHRATE_RENDER_ONCE; Oct 29, 2022 · Tired of all the useRef errors in typescript? In this beginner guide, I'm going to show you all you need to know about using React's useRef hook in typescript. Do not here that when using useRef, if the initially passed value is null, TypeScript will automatically understand it as a React. Check out Typescript-cheatsheets notes here Mar 22, 2018 · . Read the article for insights. Jul 23, 2025 · The "object is possibly null" error in TypeScript occurs when the compiler detects a potential null or undefined value for an object or variable. getElementById can theoretically return null if no element exists with the given id. It calls an API. May 19, 2022 · The "Object is possibly null" error is caused because the useRef () hook can be passed an initial value as an argument and we're passing it null as an initial value. files' is possibly 'null' on the highlighted line when there the null check on the previous line? i know i can use non-null assertion operator, but like i did in the end as you can see in the code example below, but can someone please explain this behavior? A community for discussing anything related to the React UI framework and its ecosystem. Essentially, what I want to do is expand the bounds of a map when my state variable 'stores' changes. data is not null, so therefore it should be just "dataType" inside the return statement. Conclusion Handling null and undefined values is an integral part of TypeScript. Jan 13, 2024 · ⭐ Error Message: “X is Possibly Null Or Undefined” ⭐ We start by declaring a variable searchParams that is initialized with the URLSearchParams class instance: Apr 9, 2019 · I am adding TypeScript to my project for the first time. files [0], I am getting a typescript error, "Object is possibly 'null'". May 1, 2024 · In this example, we create a ref called inputRef using the useRef hook and specify the type as HTMLInputElement. The useEffect hook fires every time the value of contents of the array passed to it changes. Anyone can help me solve this issue? I tried to declare the nativeElement as a null value, however did not manage to succeed. Aug 7, 2018 · Instead of replying, I’ve decided to write down this “short post” about how to handle React DOM refs and ref forwarding with TypeScript for anyone new to React and TypeScript as I didn’t Apr 1, 2025 · Struggling with "react ref current is null"? Discover common causes and practical solutions to ensure your refs work as expected. Jul 30, 2021 · Discover how to use useRef with TypeScript in React and React native, and how to fix issues with MutableRefObject and object is possibly 'null'. Now they are stricter, they return null as potential value in their type. Learn how to check if a TypeScript object is possibly null with this comprehensive guide. This is the lazy fix, so follow their solution. It's better to use if checks or optional chaining whenever possible. On the next renders, useRef will return the same object. Jun 1, 2020 · Typescript Object is possibly 'null' focusing using ref in react Asked 5 years, 5 months ago Modified 2 years, 6 months ago Viewed 3k times Feb 29, 2024 · The issue is that TypeScript has no guarantee that we'll assign the ref to an element or assign a value to it, so its current property could possibly be null. Oct 22, 2021 · I have an error on the following line of code that says “TS2531 Object is possibly null” this. In the renderCharactersLeft function I get the follow The second example failed because the array’s find function looks a bit like this simplification: TypeScript has a powerful system to deal with null or undefined values. current. This is more common when using the useRef hook in React. innerHTML=`${minutes}: ${seconds};` . Learn why you encounter "Object is possibly 'null'" error in React TypeScript when using refs and how to effectively solve it with proper null checking and o If you pass the ref object to React as a ref attribute to a JSX node, React will set its current property. Rank 1 on Google for 'typescript object is possibly null'. attribute = 123' is invalid and does not work. e. There are 2 principal ways to fix this: Jan 22, 2021 · you can cast ref to any as you get it from react. current: null Object is possibly 'null'. Apr 14, 2019 · When you declare const overlayEl = useRef (null); Makes the type it comes out as is null because that's the best possible inference it can offer with that much information, give typescript more information and it will work as intended. To make typescript silent and tell typescript you know what you are doing. json file. Like in existing scenario if "current" can be null in some scenarios and you want that typescript do not show error on it. Jul 14, 2021 · Why do I get a Cannot invoke an object which is possibly 'undefined' Typescript error even after I check that the func reference is not undefined? Jun 28, 2019 · Object is possibly null in TypeScript React Asked 5 years, 10 months ago Modified 3 years, 7 months ago Viewed 8k times Feb 23, 2023 · 1 why am I getting 'event. countdownEl. ts (2531) Asked 4 years, 11 months ago Modified 4 years, 11 months ago Viewed 6k times TypeScript is a language for application-scale JavaScript development. compilerOptions: strict: true or strictNullChecks: Tagged with typescript, javascript, react. Thanks for your help and time. It's possible to read or execute a method on a possibly null object with 'possibleNullObj?. However I'm getting typescript error 'Object is possibly null'. document. Show activity on this post. getShadowMap(). 怒られてしまう 個人的なケースとして、 hogehoge. MutableRefObject<null>. I have googled but couldn't find Sep 29, 2021 · Save this answer. Includes code examples and explanations. js wiht React and Typescript. I believe my interfaces are set up correctly, but I'm not passing the types correctly. RefObject<HTMLFormElement>. May 7, 2022 · TypeScript adds optional type checking capabilities to JavaScript. ynnrsf qaypa cng tumw kvzxe zqm qjss azj ipjplr ctmc oxred jqwc gygbw eduz cwrn