propTypes is not defined

i want use proptypes in my react native- redux projects . but i got the error "propTypes is not defined.

in this code:

import React from 'react';
import PropTypes from 'prop-types';
import { connect } from 'react-redux';



class AntiHack extends React.Component {
  render() {
    return <div>{this.props.steps}</div>;
  }
}

AntiHack.PropTypes = {

    steps: propTypes.number.isRequired,
    
  }



  export default AntiHack

function degreesToRadians(degrees) {
    return degrees * Math.PI / 180;
  }

  
  function distanceInKmBetweenEarthCoordinates(lat1, lon1, lat2, lon2) {
    var earthRadiusKm = 6371;
  
    var dLat = degreesToRadians(lat2-lat1);
    var dLon = degreesToRadians(lon2-lon1);
  
    lat1 = degreesToRadians(lat1);
    lat2 = degreesToRadians(lat2);
  
    var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
            Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
    return earthRadiusKm * c;
  }

console: and package.json:

{
“name”: “sirin”,
“version”: “0.1.0”,
“private”: true,
“devDependencies”: {
“jest-expo”: “~20.0.0”,
“react-native-scripts”: “1.2.1”,
“react-test-renderer”: “16.0.0-alpha.12”
},
“main”: “./node_modules/react-native-scripts/build/bin/crna-entry.js”,
“scripts”: {
“start”: “react-native-scripts start”,
“eject”: “react-native-scripts eject”,
“android”: “react-native-scripts android”,
“ios”: “react-native-scripts ios”,
“test”: “node node_modules/jest/bin/jest.js --watch”
},
“jest”: {
“preset”: “jest-expo”
},
“dependencies”: {
“art”: “^0.10.1”,
“d3”: “^4.10.2”,
“d3-array”: “^1.2.1”,
“d3-path”: “^1.0.5”,
“d3-shape”: “^1.2.0”,
“expo”: “^20.1.3”,
“prop-types”: “^15.5.10”,
“react”: “16.0.0-alpha.12”,
“react-native”: “^0.47.0”,
“react-native-chart”: “^1.0.8-beta”,
“react-native-charts-wrapper”: “^0.2.10”,
“react-native-circular-progress”: “^0.0.8”,
“react-native-customisable-switch”: “^0.1.0”,
“react-native-datepicker”: “^1.6.0”,
“react-native-device-info”: “^0.11.0”,
“react-native-drawer”: “^2.5.0”,
“react-native-elements”: “^0.16.0”,
“react-native-filesystem”: “^0.1.0”,
“react-native-installed-apps”: “0.0.6”,
“react-native-keyboard-aware-scroll-view”: “^0.3.0”,
“react-native-modal”: “^3.1.0”,
“react-native-pathjs-charts”: “0.0.31”,
“react-native-progress”: “^3.4.0”,
“react-native-responsive-image”: “^2.1.0”,
“react-native-shadow”: “^1.2.1”,
“react-native-side-menu”: “^1.0.2”,
“react-native-snap-carousel”: “^3.2.2”,
“react-native-svg”: “^5.4.1”,
“react-native-svg-image”: “^2.0.0”,
“react-native-svg-uri”: “^1.2.1”,
“react-native-switch”: “^1.1.0”,
“react-native-vector-icons”: “^4.3.0”,
“react-navigation”: “^1.0.0-beta.11”
}
}

[Ajith-Pandian]

@milad1367 You need to use “PropTypes” not “propTypes”.

[facebook-github-bot]

Hey, thanks for reporting this issue! It looks like your description is missing some necessary information, or the list of reproduction steps is not complete. Can you please add all the details specified in the Issue Template? This is necessary for people to be able to understand and reproduce the issue being reported. I am going to close this, but feel free to open a new issue with the additional information provided. Thanks! See “What to Expect from Maintainers” to learn more.