TypeError: Class extends value undefined is not a constructor or null in react js

Should be React.Component instead of React.component

Notice the capital letter.

when you import React then try React.Component and never use React.Component(). Remove these parentheses, then this error will go.

import React from 'react';
......
class App extends React.Component {
}

or you can try this.

import React, {Component} from 'react';
......
class App extends Component {

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