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Styling — is one of the elements of the front-end triada that every web developer must know: HTML/CSS/JS. On the other hand, there is a large group of web developers who don’t like CSS. They prefer to use some helpers and libraries and basically t...

When we try to pass an element or React component as a parameter to another component but the input parameter is incorrect, the error "JSX element type does not have any construct or call signatures" will appear. To solve this error, you need to use `...

To fix the React.js warning "Invalid DOM property for. Did you mean htmlFor", use the `htmlFor` attribute instead of `for` on the tag. The `htmlFor` attribute is used because `for` is a reserved word in JavaScript....

Make optionals with default values ​​in React TypeScript: Use a question mark to mark properties on a type as optional. Provide default values ​​for properties when destructuring them in the function's definition....

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'`....

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....

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....

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....

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...

When we use the useState hook in our code but forget to import it, it generates the error Uncaught ReferenceError: useState is not defined. To fix this error, you need to import the hook before using it import {useState} from react . // ?️...

Type onKeyUp events in React using React.KeyboardEvent type. KeyboardEvent interface is used for onKeyUp events. We can access the value of the key pressed by the user through `event.key`....

In React, when we initialize a ref with a null value and do not include null in its type, an error "Cannot assign to 'current' because it is a read-only property" will occur. To fix the error, include null in the type of ref, such as `...

The 'react-hooks/exhaustive-deps' rule warns us when we are missing dependencies in effect hooks. To get rid of the warning, move the function or variable declaration inside the `useEffect` hook, remember arrays and objects that change on every render...