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When we don't set the to prop on the Link component of React router, we will get the error "Cannot read property 'pathname' of undefined". To fix the error, you need to set the `to` property on the link to a specific path, such as `Home...

Fix “Component definition is missing display name” errors by setting the displayName property on the component, for example `App.displayName = 'MyApp';` ....

React.js error "X is not defined react/jsx-no-undef" occurs when we forget to import a function, class, or variable in our code before using it. To fix this error, you need to make sure you import the value before using it in your code, e.g. import {m...

When we use the useEffect hook in our code but forget to import it, it will generate “Uncaught ReferenceError: useEffect is not defined”. To fix the error, you need to import the hook before using it - `import {useEffect} from 'react'`....

To set inline styles in React: Set the style property on an element to an object. Set specific CSS properties and values ​​to style the element. For example, ....

Use type guards to resolve the "Object is possibly null" error for the useRef hook in React, such as `if(inputRef.current){}`. Once null is excluded from the type of ref, we can access properties on the ref that correspond to its type....

Use the `useLocation()` hook to get the current route through React Router, such as `const location = useLocation()`. The hook returns the current location object. For example, we can access the pathname as location.pathname....

When the name of a component starts with a lowercase letter, an error "Property does not exist on type 'JSX.IntrinsicElements" will appear. To fix this error, you need to make sure you always start your component names with an uppercase letter, instal...

The warning "value prop on input should not be null" is caused when we set the initial value of an input to null or override the initial value setting it to null, e.g. from an empty API response. Use a fallback value to solve this problem....

React.js error "Type {children: Element} has no properties in common with type IntrinsicAttributes" occurs when we try to pass children prop to a component without any props. To resolve the error, you need to define and type the properties on the comp...

When we try to return an array of elements from a function component, a React.js error “Type '() => JSX.Element[]' is not assignable to type FunctionComponent” occurs. To fix the error, you need to wrap the array of elements in a React fragment....

When we try to export an anonymous function using default export, it results in the warning “Unexpected default export of anonymous function.” To fix this error, you need to give the function a name before exporting it....

The React.js error “Property does not exist on type 'Readonly'” occurs when we try to access the props or state of an untyped class component. To fix the error, you need to use generics on the React.Component class to type the props or state of th...

When we use a string as a reference in a function component, we get the error "Function components cannot have string refs". To fix this error, we need to use the useRef() hook to get a mutable ref object that we can use as a component....

To resolve the “Uncaught ReferenceError: process is not defined” error in React, open a terminal in the root directory of your project and update the version of the `react-scripts` package by running `npm install react-scripts@latest` and reinstal...