Project/projectreact/src/components/avatar.js

import React from 'react'
import ReactDOM from 'react-dom'
import Avatar from 'react-avatar-edit'

class App extends React.Component {

  constructor(props) {
    super(props)
    const src = './example/einshtein.jpg'
    this.state = {
      preview: null,
      src
    }
    this.onCrop = this.onCrop.bind(this)
    this.onClose = this.onClose.bind(this)
    this.onBeforeFileLoad = this.onBeforeFileLoad.bind(this)
  }
  
  onClose() {
    this.setState({preview: null})
  }
  
  onCrop(preview) {
    this.setState({preview})
  }

  onBeforeFileLoad(elem) {
    if(elem.target.files[0].size > 71680){
      alert("File is too big!");
      elem.target.value = "";
    };
  }
  
 
}

const Avatar = () => {
    return (
      <div>
        <Avatar
          width={390}
          height={295}
          onCrop={this.onCrop}
          onClose={this.onClose}
          onBeforeFileLoad={this.onBeforeFileLoad}
          src={this.state.src}
        />
        <img src={this.state.preview} alt="Preview" />
      </div>
    )
    }

    export default Avatar