Backend API
        
    import React from 'react';
import VectorMap, {
  ILayerProps,
  ILegendProps, ITooltipProps,
  Layer,
  Legend,
  Source,
  Tooltip,
} from 'devextreme-react/vector-map';
import * as mapsData from 'devextreme-dist/js/vectormap-data/world.js';
import { populations } from './data.ts';
const colorGroups = [0, 0.5, 0.8, 1, 2, 3, 100];
const bounds = [-180, 85, 180, -60];
const customizeLayer: ILayerProps['customize'] = (elements) => {
  elements.forEach((element) => {
    element.attribute('population', populations[element.attribute('name')]);
  });
};
const customizeText: ILegendProps['customizeText'] = (arg) => {
  let text;
  if (arg.index === 0) {
    text = '< 0.5%';
  } else if (arg.index === 5) {
    text = '> 3%';
  } else {
    text = `${arg.start}% to ${arg.end}%`;
  }
  return text;
};
const customizeTooltip: ITooltipProps['customizeTooltip'] = (arg) => {
  if (arg.attribute('population')) {
    return { text: `${arg.attribute('name')}: ${arg.attribute('population')}% of world population` };
  }
  return null;
};
export default function App() {
  return (
    <VectorMap id="vector-map" bounds={bounds}>
      <Layer
        dataSource={mapsData.world}
        palette="Violet"
        name="areas"
        colorGroupingField="population"
        colorGroups={colorGroups}
        customize={customizeLayer}
      ></Layer>
      <Tooltip enabled={true} customizeTooltip={customizeTooltip}></Tooltip>
      <Legend customizeText={customizeText}>
        <Source layer="areas" grouping="color"></Source>
      </Legend>
    </VectorMap>
  );
}
    
    import React from 'react';
import VectorMap, {
  Layer, Legend, Source, Tooltip,
} from 'devextreme-react/vector-map';
import * as mapsData from 'devextreme-dist/js/vectormap-data/world.js';
import { populations } from './data.js';
const colorGroups = [0, 0.5, 0.8, 1, 2, 3, 100];
const bounds = [-180, 85, 180, -60];
const customizeLayer = (elements) => {
  elements.forEach((element) => {
    element.attribute('population', populations[element.attribute('name')]);
  });
};
const customizeText = (arg) => {
  let text;
  if (arg.index === 0) {
    text = '< 0.5%';
  } else if (arg.index === 5) {
    text = '> 3%';
  } else {
    text = `${arg.start}% to ${arg.end}%`;
  }
  return text;
};
const customizeTooltip = (arg) => {
  if (arg.attribute('population')) {
    return {
      text: `${arg.attribute('name')}: ${arg.attribute('population')}% of world population`,
    };
  }
  return null;
};
export default function App() {
  return (
    <VectorMap
      id="vector-map"
      bounds={bounds}
    >
      <Layer
        dataSource={mapsData.world}
        palette="Violet"
        name="areas"
        colorGroupingField="population"
        colorGroups={colorGroups}
        customize={customizeLayer}
      ></Layer>
      <Tooltip
        enabled={true}
        customizeTooltip={customizeTooltip}
      ></Tooltip>
      <Legend customizeText={customizeText}>
        <Source
          layer="areas"
          grouping="color"
        ></Source>
      </Legend>
    </VectorMap>
  );
}
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(
  <App />,
  document.getElementById('app'),
);
    
    export const populations = {
  China: 19,
  India: 17.4,
  'United States': 4.44,
  Indonesia: 3.45,
  Brazil: 2.83,
  Pakistan: 2.62,
  Nigeria: 2.42,
  Bangladesh: 2.18,
  Russia: 2.04,
  Japan: 1.77,
  Mexico: 1.67,
  Philippines: 1.39,
  Vietnam: 1.25,
  Ethiopia: 1.23,
  Egypt: 1.21,
  Germany: 1.13,
  Iran: 1.08,
  Turkey: 1.07,
  'Congo (Kinshasa)': 0.94,
  France: 0.92,
  Thailand: 0.9,
  'United Kingdom': 0.89,
  Italy: 0.85,
  Burma: 0.84,
  'South Africa': 0.74,
  'S. Korea': 0.7,
  Colombia: 0.66,
  Spain: 0.65,
  Tanzania: 0.63,
  Kenya: 0.62,
  Ukraine: 0.6,
  Argentina: 0.59,
  Algeria: 0.54,
  Poland: 0.54,
  Sudan: 0.52,
  Canada: 0.49,
  Uganda: 0.49,
  Iraq: 0.47,
  Morocco: 0.46,
  Uzbekistan: 0.43,
};
    
    window.exports = window.exports || {};
window.config = {
  transpiler: 'ts',
  typescriptOptions: {
    module: 'system',
    emitDecoratorMetadata: true,
    experimentalDecorators: true,
    jsx: 'react',
  },
  meta: {
    'react': {
      'esModule': true,
    },
    'typescript': {
      'exports': 'ts',
    },
    'devextreme/time_zone_utils.js': {
      'esModule': true,
    },
    'devextreme/localization.js': {
      'esModule': true,
    },
    'devextreme/viz/palette.js': {
      'esModule': true,
    },
    'devextreme-dist/js/vectormap-data/*': {
      'esModule': true,
    },
    'openai': {
      'esModule': true,
    },
  },
  paths: {
    'npm:': 'https://cdn.jsdelivr.net/npm/',
    'bundles:': '../../../../bundles/',
    'externals:': '../../../../bundles/externals/',
  },
  defaultExtension: 'js',
  map: {
    'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',
    'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
    'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',
    'react': 'npm:react@17.0.2/umd/react.development.js',
    'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',
    'prop-types': 'npm:prop-types/prop-types.js',
    'devextreme-dist/js/vectormap-data': '../../../../js/vectormap-data',
    'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
    'luxon': 'npm:luxon@3.4.4/build/global/luxon.min.js',
    'es6-object-assign': 'npm:es6-object-assign',
    'devextreme': 'npm:devextreme@link:../../packages/devextreme/artifacts/npm/devextreme/cjs',
    'devextreme-react': 'npm:devextreme-react@link:../../packages/devextreme-react/npm/cjs',
    'devextreme-quill': 'npm:devextreme-quill@1.7.6/dist/dx-quill.min.js',
    'devexpress-diagram': 'npm:devexpress-diagram@2.2.24/dist/dx-diagram.js',
    'devexpress-gantt': 'npm:devexpress-gantt@4.1.64/dist/dx-gantt.js',
    'inferno': 'npm:inferno@8.2.3/dist/inferno.min.js',
    'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
    'inferno-create-element': 'npm:inferno-create-element@8.2.3/dist/inferno-create-element.min.js',
    'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
    'inferno-hydrate': 'npm:inferno-hydrate/dist/inferno-hydrate.min.js',
    'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
    'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
    'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
    '@preact/signals-core': 'npm:@preact/signals-core@1.8.0/dist/signals-core.min.js',
    'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3',
    // SystemJS plugins
    'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
    'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',
    // Prettier
    'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',
    'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',
  },
  packages: {
    'devextreme': {
      defaultExtension: 'js',
    },
    'devextreme-react': {
      main: 'index.js',
    },
    'devextreme-react/common': {
      main: 'index.js',
    },
    'devextreme/events/utils': {
      main: 'index',
    },
    'devextreme/common/core/events/utils': {
      main: 'index',
    },
    'devextreme/localization/messages': {
      format: 'json',
      defaultExtension: 'json',
    },
    'devextreme/events': {
      main: 'index',
    },
    'es6-object-assign': {
      main: './index.js',
      defaultExtension: 'js',
    },
  },
  packageConfigPaths: [
    'npm:@devextreme/*/package.json',
  ],
  babelOptions: {
    sourceMaps: false,
    stage0: true,
    react: true,
  },
};
System.config(window.config);
// eslint-disable-next-line
const useTgzInCSB = ['openai'];
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
    
    export const populations = {
  China: 19,
  India: 17.4,
  'United States': 4.44,
  Indonesia: 3.45,
  Brazil: 2.83,
  Pakistan: 2.62,
  Nigeria: 2.42,
  Bangladesh: 2.18,
  Russia: 2.04,
  Japan: 1.77,
  Mexico: 1.67,
  Philippines: 1.39,
  Vietnam: 1.25,
  Ethiopia: 1.23,
  Egypt: 1.21,
  Germany: 1.13,
  Iran: 1.08,
  Turkey: 1.07,
  'Congo (Kinshasa)': 0.94,
  France: 0.92,
  Thailand: 0.9,
  'United Kingdom': 0.89,
  Italy: 0.85,
  Burma: 0.84,
  'South Africa': 0.74,
  'S. Korea': 0.7,
  Colombia: 0.66,
  Spain: 0.65,
  Tanzania: 0.63,
  Kenya: 0.62,
  Ukraine: 0.6,
  Argentina: 0.59,
  Algeria: 0.54,
  Poland: 0.54,
  Sudan: 0.52,
  Canada: 0.49,
  Uganda: 0.49,
  Iraq: 0.47,
  Morocco: 0.46,
  Uzbekistan: 0.43,
};
    
    <!DOCTYPE html>
<html lang="en">
  <head>
    <title>DevExtreme Demo</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" />
    <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/25.1.6/css/dx.light.css" />
    <link rel="stylesheet" type="text/css" href="styles.css" />
    <script src="https://cdn.jsdelivr.net/npm/core-js@2.6.12/client/shim.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/systemjs@0.21.3/dist/system.js"></script>
    <script type="text/javascript" src="config.js"></script>
    <script type="text/javascript">
      System.import("./index.tsx");
    </script>
  </head>
  <body class="dx-viewport">
    <div class="demo-container">
      <div id="app"></div>
    </div>
  </body>
</html>
    
    #vector-map {
  height: 440px;
}