Create is not a function react It is actually regular ES6 class which inherits from React. js in index. onClick is the cornerstone of any React app. Skipping re-renders with memo does not prevent the children receiving fresh context values. The root in React is a pointer to the top-level data structure that React uses to track a tree to render. I don't need dynamic paths created or even getStaticProps function. Like you're saying - easier to be tested, not necessarily has to be scoped to the component (for example if you're filtering some data - just pass the data from the component in, define the function outside). Jan 14, 2025 · The error message Uncaught TypeError: object is not a function indicates that the code is trying to call a method or property as a function, but the value being referenced isn't a function. invokeGuardedCallbackDev (react-dom. js this. 7. Nov 11, 2018 · It's because no callback function is being passed into useEffect. import React from "react"; import { MemoryRouter } from "react-router-dom"; import { ren Apr 19, 2021 · I am using @monaco-editor/react@3. However when running it (both with a simple npm start, or building and using serve) I'm getti Jul 8, 2019 · I'm trying to use context to create a authentication provider for my app. log(useContext(globalContext)), I get the Dec 3, 2018 · × TypeError: this. createContext) is not a function on Nextjs using Redux Mar 23, 2023 · My project is in React Native and I am using jest for testing. However still for some reason if you still want to render React in lwc , I Is there a particular reason why arrow functions cause these errors in React, but ES5 functions do not? I have tried Googling this issue, but was not able to find an answer. Each ref object will be created twice, but one of the versions will be discarded. Jul 27, 2021 · 0 hello I am learning react and currently I stumble on an error message: (TypeError: newsData. map is not a function I've looked at: React code throwing “TypeError: this. Parameters action: The action performed by the user. createPortal is not supported inside a React TestRenderer tree. js:17396) at HTMLUnknownElement. This is the original format, but the error still remains, create function of the user servic. init is not a function occurs when you have an outdated, globally installed version of the React native CLI. In most IDEs, using StyleSheet. com/react/build-a-complete-property-listings-page-with-react/ I ended up getting an error when i trie If I do explicitly use React. After writing the server. optional dependencies: The list of all reactive values referenced inside of the createHandle May 9, 2015 · Uncaught TypeError: this. Unfortunately, it is not clear in the docs how should I use the store created in zustand. 7 使用框架: React 复现步骤 使用 zustand 构建 store 后正常页面内引入，使用 dev:weapp 打包出错：taro. Also, as a workaround, I've been defining a method to instantiate the object and set all properties, but I don't think that's a good long-term solution, and for classes with many properties, it gets huge: Dec 31, 2021 · Running gitlap yml deployment returns Module. create is not a function The app is question has a reference to an axios request from another file on App. See more examples below. create is not a function after babel compile #5372 Jun 12, 2024 · Reproducible in vscode. CSS/HTML also works well, but when I'm testing with @testing-library/react it returns an error: &quot;React. Component. useForm () is not a function or is not iterable React Asked 5 years, 8 months ago Modified 1 year, 10 months ago Viewed 10k times Jun 23, 2022 · Description npx react-native init Name throws when creating a template with RN v0. I decided to strip out the original code for font-size from quilljs and expand on it (as seen below): import Parch Oct 25, 2019 · Hi so i have been trying to implement react context api into my project, After follow the steps in the guide: https://developerhandbook. If I'm wrong and you're structuring your code in a way that you do intend to pass a reaction to this function, then you should rename the parameter to make that clear. render() call that was used with the container, and create a new root with createRoot(). Jun 27, 2022 · This is not necessary if you are integrating React Native into an existing application, if you "ejected" from Expo, or if you're adding Android support to an existing React Native project (see Integration with Existing Apps). createContext is not a function" error while running a react-native application. What to do if module doesn't have @types? Aug 9, 2021 · • write function is used to create custom component or assign default value at time of editing. The export default prefix is a standard JavaScript syntax (not specific to React). React Function Components, also known as React Functional Components, are the status quo for writing modern React applications. js file and trying to compile I got a BSON e React. In you child component you are doing some action and you need to pass that event or some custom value to the parent component you can use a callback function, is that what you are looking, If yes, i can add a sample snippet code. useState) is not a function in another file where I use React hooks. Parameters ref: The ref you received as a prop to the MyInput component. I'm sorry it doesn't seem to be working, but with so many requests that we get here and in the VS Code issue tracker, we just cannot provide the support we would like to offer. Oct 1, 2025 · The “Uncaught TypeError: $ Is Not a Function” Error is a common Javascript error. I'm getting not a function for any of the set functions below. Here's an example using a switch statement: I definitely do that with large functions. Jun 15, 2024 · The creation of the React Context is the source of the error message because pages and components in the Next. react_production_min. Dec 20, 2022 · I am implementing axios interceptor in tsx for react native expo. (In 'axios . If your component function is pure (as it should be), this should not affect the behavior. The way is is now, the React variable that is passed into the function is RandomWords, ReactDOM is React and ReactDOM is never injected. My project is built on top of the Electron React Boilerplate boiler Is this RequireJS? You specify three dependencies, but only use two. html Dec 1, 2022 · If you get this error when trying to create a react native project it means that the react cli is not installed globaly. But it gives me this error: TypeError: setCurrentUser is not a function. //ap Mar 3, 2021 · TypeError: _axios. You need to unistall react-native-cli using the following command: Similarly, if you create a new function when rendering the parent component, React will consider it to have changed even if the function has the same definition. Usage Updating state based on previous state To update a state based on previous state we should use updater functions Jan 22, 2019 · I am getting "React. Each call to cache creates a new function. Jun 15, 2024 · The Problem When initializing a new React Native project using npx , you may get this error: This issue typically arises due to a mismatch between the… Dec 3, 2024 · I'm fairly new to react (webdev in general), and built a simple hello world using npx create-react-app. How Mar 21, 2023 · Describe the bug In my app i upgrade axios from ^0. 21. createClass is not a function [duplicate] Asked7 years, 11 months ago Modified 7 years, 6 months ago Viewed 3k times -1 This question already has answers here: ReactJs CreateClass is not a function (7 answers) Oct 7, 2022 · All uses of Axios today are creating axios. Jul 7, 2022 · react 引用 react- redux运行时出现下列报错： TypeError: _WEBPACK_IMPORTED_MODULE_0_ react ___default. I am following this tutorial to create an authentication system. create is not a function Do you know what can be happening? Thanks in advance Feb 19, 2025 · 相关平台 微信小程序 小程序基础库: 3. create is not a function Dec 30, 2020 · I am using emotion/styled with Next. default) is not a function at Object. so do not try to create folder or event project name with same modul thats we The magic of components lies in their reusability: you can create components that are composed of other components. props is not undefined (and does have a value equivalent to the JSON object - can call with window May 2, 2023 · TypeError: (0 , _react. cachedFn will also cache errors. Mar 22, 2019 · Uncaught TypeError: create is not a function at commitHookEffectList (react-dom. render() to render your React components into the container. Functions are a fundamental aspect of React development, as they enable us to encapsulate logic and UI elements into reusable blocks of code. After my page loads, I can verify that this. In Strict Mode, React will call your component function twice in order to help you find accidental impurities. Usually, you will return an object with the methods you want to expose. React automatically re-renders all the children that use a particular context starting from the provider that receives a different value. create is not a function Jun 27, 2022 · This is not necessary if you are integrating React Native into an existing application, if you "ejected" from Expo, or if you're adding Android support to an existing React Native project (see Integration with Existing Apps). • read function is used to read the value from component at time of save. 19 react-native-cli: 2. Most of the functionality that React components framework provide , lightning web components also provide them. 69 Version 0. Apr 7, 2024 · The error TypeError: cli. e. useSate and React. Naming the styles is a good way to add meaning to the low level components in the render function, and encourage reuse. dev or VS Code Desktop Reproducible in the monaco editor playground? Not reproducible in the monaco editor playground Mo Jun 17, 2016 · TypeError: StyleSheet. Because inline functions are cheap, the re-creation of functions on each rendering is not a problem. Tagged with react, gitlap, deployment, nodeversion. But also, your parameter to that execute function shouldn't be a MessageReaction, it should be a message. createHandle: A function that takes no arguments and returns the ref handle you want to expose. create is not a function Aug 17, 2024 · Learn how to resolve the `TypeError: o. 4 to 1. Dec 13, 2022 · Uncaught TypeError: _axios. Since CounterWithWeekday 's output is ok nothing gets re-mounted. Nov 27, 2017 · In VS 2015, 2017 open tutorial and got: Uncaught TypeError: React. Just be careful and bind it to the correct context in onClick event: I found a problem in my code when I was trying to use these two functions in my React version 15. However, like any powerful tool, React is not May 19, 2024 · The last line is causing the error: import React from "react"; import ReactDOM from "react-dom"; import App from ". They serve the same purpose as JavaScript functions, but work in isolation and return HTML. is comparison. This means that calling cache with the same function multiple times will return different memoized functions that do not share the same cache. Both the May 29, 2017 · In my test target code I use "Axios. It sets up your development environment so that you can use the latest JavaScript features, provides a nice developer experience, and optimizes your app for production. ReactDOM. Oct 4, 2022 · Example of the Class code, I tried to write the method as a function, arrow function, and a getter, but none worked. 0-experimental-33c3af284 Steps To Reproduce npx create-react-app my-app template typesc Oct 9, 2021 · I am using React's Context API to call setCurrentUser below. May 15, 2024 · The error is caused by the "react/function-component-definition" React linting rule from the ESLint plugin. Usage Updating state based on previous state To update a state based on previous state we should use updater functions If I do explicitly use React. Dec 17, 2021 · Create React App Create React App is a comfortable environment for learning React, and is the best way to start building a new single-page application in React. The form that I created doesn't work then I tried adding the example code snippets from Formik as you could see below. booksRefresh(): Sep 12, 2021 · After tried to run a simple nodejs code to test my store in javascript, I encountered the create is not a function error. Let me know Jul 13, 2021 · To avoid the this keyword context from being replaced by the function, you can declare the function using JavaScript arrow function syntax that was introduced in JavaScript ES6 version. ts. I am trying to create a custom font size drop-down for the toolbar in ReactQuill. map(React. Using this as a reference: https://reactjs. jsx:6 (anonymous) @ tutorial. callCallback (react-dom. Mar 31, 2025 · In addition to manual debugging, several tools and best practices have helped me become more efficient in solving React errors, including the “Undefined is Not a Function” error. create is not a function. Jul 23, 2025 · To create a functional component in React, you define a JavaScript function that returns JSX. com Are you getting React createClass is not a function? Install create-react-class to fix your problem. Note: Until September 2024, we referred to all Server Functions as “Server Actions”. In the past, there have been various React Component Types, but with the introduction of React Hooks it's possible to write your entire application with just functions as React components. log(create) logged the following result: Oct 31, 2022 · React is just a layer over JavaScript, so when a function has no return statement, or the value-less return statement (usually as part of a conditional), it returns undefined. It's using a memo to fetch authentication if auth c Apr 12, 2022 · If you are using typescript with react, then you need to import relative dependencies that support types and meets other typescript condition. 0. It can be a value of any type. createRoot (document. Jun 20, 2019 · React-i18next createContext is not a function Hello. createClass is not a function at Nov 7, 2022 · Next. When upgrading from an older Create React App you need to create setupTests. createRef()) What are you trying to do? Most of the time, refs are not what you want. io but I keep receiving TypeError _interopRequireDefault is not a function import ReactDOM from "react-dom"; Please let me know how I can fix this, thank you. May 17, 2021 · I'm using the following JSX code with a custom CKEditor that I built using the online-builder When I add this editor to my node modules and try to use it like the following: import React, { Compone Caveats React will invalidate the cache for all memoized functions for each server request. I want to solve the problem not implement a workaround. useEffect it also forces me to change all of my other useState and useEffect hooks to React. If your app doesn't work after updating to React 18, check whether it's wrapped in <StrictMode>. create Context is not a function 具体如图： 原因有两种： 与安装的 React 版本有关。 Aug 23, 2021 · I'm following the Zustand wiki to implement testing, but the provided solution is not working for a basic test for app rendering. optionaloptions: An object with options for this React root. These components are stateless and rely on props for data input. StyleSheet. Apr 18, 2020 · Describe the bug Currently writing tests for my app, and I need to use the Testing Library's waitFor method. Aug 17, 2021 · i have same problem but its solved and i just want to share. I a troubleshoot with react-i18next for translate my app, during the import i18n. React Components Components are independent and reusable bits of code. So your AddBookForm 's parameter shouldn't be booksRefresh, but (by convention) props, and then you use it via props. useCallback () memoizes callback functions. editor. /stockChart"; ReactDOM. map takes a function and an array as its arguments and returns a new array. js, I a type error. js and TypeScript. To resolve this issue, you should choose either createRoot or ReactDOM. Click on any of the examples below to see code snippets and common uses: Call a Function After Clicking a Button Call an Inline Function in an onClick Event Handler Call Multiple Functions in an onClick Event Handler Update the State inside Aug 26, 2020 · This way, React will just compare the output of the function, but not the function itself (as it would, in the case if we use it as a component). Jun 15, 2024 · The Problem When initializing a new React Native project using npx , you may get this error: This issue typically arises due to a mismatch between the… Jul 8, 2019 · I'm trying to use context to create a authentication provider for my app. 0 Output of npx react-native info yarn v1. createRef() to the map function, which expects a function, not a React ref. That will fail unless the one you don't use is the last one in the dependency array because the ones you pass to the function will mismatch. Nov 4, 2022 · So Webpack is considering Axios as assets and creates a file for that which we don't need. The previous and the next values are compared with the Object. But in some cases you need to maintain a single function instance between renderings: A functional component Mar 2, 2020 · AntD using Form [form]=Form. (:4444/anonymous function) Jan 10, 2024 · I'm testing a react native app with Jest and React Testing Library, but every time i run the tests i get the following error: TypeError: _reactNative. so do not try to create folder or event project name with same modul thats we ReactDOM. It should take a selector function as its only argument. Indeed the axios. map () is not a function Neither of these has helped me fix the problem. a. js:143) at Object. How can I test Axios. A few inline functions per component are acceptable. Sep 20, 2022 · I saw this post before posting and not exactly. js To call a function in React TypeScript based on the string value passed into another function, you can use a switch statement or an object with function properties. default. createClass is not a function at tutorial. If a Server Function is passed to an action prop or called from inside an action then it is a Server Action, but not all Server Functions are Server Actions. This is development-only behavior and does not affect production. Does anyone have any idea how to solve this issue? Update: I found a solution using craco: #11889 (comment). its all happen because "npx react-native init Redux" well i try to create another react-native init with different name and move all folder from old one that i named it "Redux" then its all running normal. createRoot is not a function React & ReactDOM version:^0. I searched for 'createContent' in the code, it doesn't exist. Learn the error 'cannot call a class as a function' and how to fix it. js 13 uses React Server Components by default, which don't support any sort of state. In this guide, we'll delve into a common scenario where this error occurs and walk through the steps necessary to resolve it. create is not a function but when i did make it axios. createRequire is not a function. If you have a single page app built in React and want to render in salesforce the best bet would be to use the lightning:container. create like I use Axios in mockAdapter? React. Vs code does not notify me of an error only my browser displays it (I use crome) Aug 21, 2025 · Output: When a functional component receives input and is rendered, React uses props and updates the virtual DOM to ensure the UI reflects the current state. Try I am now trying to create a form on NextJs 13 (Typescript) with Formik. (More on importing in Importing and Exporting Components!) Step 2: Define the function With function Profile() { } you define a JavaScript function with the name Profile. create ()', 'axios. Jan 29, 2022 · 📝 Provide detailed reproduction steps (if any) Im Using react app after I download my custom build from CKEditor 5 online builder then I follow these steps, I got this err on console TypeError: this. map can be used to iterate over an array of elements and perform a transformation on each element. ts file in __mocks__ folder. In the example above, it is actually executing the fetch request which doesn't return anything. map is not a function, but a higher-order function. I am geting following error: TypeError: axios. Do I have to downgrade vite version too or how can I use react with vite ? Error: main. I wouldn't say it is or isn't the recommended way of doing things as React itself isn't very rich with documentation on common best practice use Apr 4, 2024 · The "Cannot call a class as a function" error is a common stumbling block for developers. org/docs/hooks-state. Oct 9, 2015 · I'm building a web-app with ReactJS and Flux and I'm trying to get the node of my current div using the method findDOMNode and I get the next error: Uncaught TypeError: React. Oct 14, 2017 · Julian Valencia is having issues with: In the video there are no Javascript errors, but I see this: Uncaught TypeError: react2. Components come in two types, Class components and Function components, in this tutorial we will concentrate on Function components. handleLanguage is not a function I'm trying to pass a data to a parent from his child with following this issue: How to pass data from child component to its parent in ReactJS? Server Functions React Server Components Server Functions are for use in React Server Components. Feb 12, 2021 · I am creating a header which shows sign in / sign up link if the user is not already signed in or a sign out link if a user is already signed in Here is my header component: import React, { Compo Dec 4, 2024 · Everythign works in dev mode, but if you build without adding: exposes: { '. /src/App', // Needed for the build to work }, the app won't work and you get Uncaught TypeError: factory is not Nov 18, 2023 · ReactJS has revolutionized the way developers build user interfaces by introducing a declarative and efficient approach to building UI components. createContext is not a function` error in React. So assume you have a parent and child component. Upon logging console. 0 以上可复现错误，旧版本正常 期望结果 正常使用 zustand 实际结果 报错 taro. Following a guide for Authentication with react router and react hooks. That ref handle can have any type. Apr 6, 2024 · The root has a render() method that can be used to render a React element into the DOM. 22. props. js:193) at Caveats React will invalidate the cache for all memoized functions for each server request. jsx:6 Uncaught Type Jan 9, 2020 · The argument a React function component receives is its props, which is an object with named properties for each of the properties. 1 react-native: n/a - not inside a React Native project directory So In React, the onClick handler allows you to call a function and perform an action when an element is clicked. create' is undefined). If you want to use createRoot, you should remove the previous ReactDOM. Basically issue is using react-test-renderer to create a snapshot of a component, which contain React createPortal function. But as you nest more and more components, it often makes sense to start splitting them into different files. /App': '. create is not a function，但是使用 build:weapp 则不会出错，zustand 版本5. create (my_config)", and I get the same error: TypeError: axios. Apr 20, 2021 · This looks like an issue for the @monaco-editor/react npm module, which is not part of this project. 4 This is my simple code below React will set the next state to the result of calling the reducer function you’ve provided with the current state and the action you’ve passed to dispatch. That allowed me to solve the issue without downgrading. Typescript. Props: Functional components receive input data through props, which are objects containing key-value pairs. In the new API, we create a root and then call the render() method on it. It lets you mark the main function in a file so that you can later import it from other files. I think you want . com/react/build-a-complete-property-listings-page-with-react/ I ended up getting an error when i trie How to create storesReturns create returns a React Hook with API utilities, setState, getState, getInitialState and subscribe, attached. It lets you return data that is based on current state, using a selector function. map(() => React. Processing Props: After receiving props, the component processes them and returns a JSX element that defines the component's Nov 1, 2018 · In my create react app project I'm running into the following error in my production build (not in my dev build): Uncaught TypeError: (0 , o. js, but getting 'getStaticPaths is not a function' error when using Framer motion. js App Router are React Server Components by default. post is not a function Oct 8, 2025 · Code quality tips: By moving styles away from the render function, you're making the code easier to understand. Strict mode was changed in Feb 23, 2021 · I'm trying to use Create React App on Codesandbox. Here it is App. To use React. In this Answer, we'll walk you through how to create a function in React, commonly known as a functional component in React. map can be used to create complex UI components in a declarative way. Server Components are pre-rendered into HTML on the server before being sent to the client and don’t support creating or consuming context directly. create function does not work anymore and when I downgrade my version to 1. Nov 11, 2023 · I am not using React Server Components, just Next. Jul 29, 2020 · This isn't a CRA issue, its a code issue so can you please close this issue? . getEleme Dec 31, 2021 · Running gitlap yml deployment returns Module. Jun 12, 2019 · In Create React App import '@testing-library/jest-dom' will be in setupTests. Learn all about it and how to easily fix it in this tutorial. Just downgraded react version to 18 to 16 but my app is broken. 3 axios. Discussion on best practices for creating functions inside React functional components, addressing concerns about performance and re-rendering. handleClick is a different function object on every rendering of MyComponent. 3. Feb 1, 2019 · 2 I am trying to use react hooks but I must be missing something. js there is a command: React will create a root for this DOM element and allow you to call functions on the root, such as render to display rendered React content. Jan 22, 2019 · I am getting "React. Sep 2, 2019 · I am not sure why you want the React to work inside lightning web component. So try running the command npm i --save-dev @types/react-dom And in case you are working with dependencies that doesn't support typescript then you can get around with this method. f. Functional components are concise, easy to read, and can utilize React Hooks for managing state and side effects, making them a fundamental building block for React applications. React. So I removed the code. See full list on bobbyhadz. js:171 Feb 17, 2017 · My code was working fine. How to create storesReturns create returns a React Hook with API utilities, setState, getState, getInitialState and subscribe, attached. Jan 23, 2022 · Updating a React context: "x is not a function" Asked 3 years, 9 months ago Modified 1 year, 6 months ago Viewed 8k times Mar 3, 2021 · TypeError: _axios. . create it started working what should be correct way to use it. • destroy function is used to destroy the component By using this feature, we can render the DropDownList component to edit the field. map is not a function) in my browser when I run my code. Context, add the "use client"; directive at the top of the file. dev or in VS Code Desktop? Not reproducible in vscode. Putting a console. Feb 21, 2021 · This React error seems particularly cryptic, but ends up making a lot of sense when you get the hang of the useEffect hook. jsx:6 react. Oct 8, 2015 · I am trying to require a file and afterwards pass it to a var. createRef()) means pass the result of calling React. 0 it works a You can create functions in react components. create() will offer static type checking and suggestions to help you write valid styles. By convention, an action is usually an object with a type property identifying it and, optionally, other properties with additional information React. It works well on yarn dev. Creating a Apr 12, 2022 · If you are using typescript with react, then you need to import relative dependencies that support types and meets other typescript condition. This lets you keep your files easy to scan and reuse components in more places. I added some new functions for login and it broke it. This comprehensive guide covers common causes, troubleshooting steps, and Dec 16, 2022 · I'm using Vite with React. I didn't found the reason why you are getting redux createStore is not a function but I was able to make your code work with few changes. js:17372) at commitPassiveHookEffects (react-dom. It's using a memo to fetch authentication if auth c React is a popular JavaScript library for building user interfaces, allowing developers to create reusable components. 0, nonetheless, I found a workaround but I would like to know if there's a better solution. Hope this helps. data. useEffect The next error just becomes: TypeError: (0 , _react. react Mar 13, 2024 · Axios is not a function error, how to resolve? Asked 1 year, 7 months ago Modified 1 year, 7 months ago Viewed 5k times Oct 7, 2022 · Hello to you, I am creating this ticket because I have a problem with the latest version of your package released a few hours ago. findDOMNode is not a Mar 19, 2023 · You cannot use the same container for both. Having it in the JSDoc comment doesn't require an import. The order has to be consistent. development. 69. Ended up with reinstall the react-native after removing react-native-cli. map is not a function” React. 2. owfpuwq jmkckr jdnxu qeqplj ikceoj fivuu eendtvc qkco gmbcbx extwb qbqvnd arfa ylao gnvlegm qcmpyzz