Sphere Mollweide

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import Graticule from 'ol/Graticule.js';
import Map from 'ol/Map.js';
import View from 'ol/View.js';
import GeoJSON from 'ol/format/GeoJSON.js';
import VectorLayer from 'ol/layer/Vector.js';
import Projection from 'ol/proj/Projection.js';
import VectorSource from 'ol/source/Vector.js';
import {register} from 'ol/proj/proj4.js';
import proj4 from 'proj4';

proj4.defs('ESRI:53009', '+proj=moll +lon_0=0 +x_0=0 +y_0=0 +a=6371000 ' +
    '+b=6371000 +units=m +no_defs');
register(proj4);

// Configure the Sphere Mollweide projection object with an extent,
// and a world extent. These are required for the Graticule.
var sphereMollweideProjection = new Projection({
  code: 'ESRI:53009',
  extent: [-9009954.605703328, -9009954.605703328,
    9009954.605703328, 9009954.605703328],
  worldExtent: [-179, -89.99, 179, 89.99]
});

var map = new Map({
  keyboardEventTarget: document,
  layers: [
    new VectorLayer({
      source: new VectorSource({
        url: 'data/geojson/countries-110m.geojson',
        format: new GeoJSON()
      })
    })
  ],
  target: 'map',
  view: new View({
    center: [0, 0],
    projection: sphereMollweideProjection,
    resolutions: [65536, 32768, 16384, 8192, 4096, 2048],
    zoom: 0
  })
});

new Graticule({
  map: map
});

<!DOCTYPE html>
<html>
  <head>
    <title>Sphere Mollweide</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>

  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      import Graticule from 'ol/Graticule.js';
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import GeoJSON from 'ol/format/GeoJSON.js';
      import VectorLayer from 'ol/layer/Vector.js';
      import Projection from 'ol/proj/Projection.js';
      import VectorSource from 'ol/source/Vector.js';
      import {register} from 'ol/proj/proj4.js';
      import proj4 from 'proj4';


      proj4.defs('ESRI:53009', '+proj=moll +lon_0=0 +x_0=0 +y_0=0 +a=6371000 ' +
          '+b=6371000 +units=m +no_defs');
      register(proj4);

      // Configure the Sphere Mollweide projection object with an extent,
      // and a world extent. These are required for the Graticule.
      var sphereMollweideProjection = new Projection({
        code: 'ESRI:53009',
        extent: [-9009954.605703328, -9009954.605703328,
          9009954.605703328, 9009954.605703328],
        worldExtent: [-179, -89.99, 179, 89.99]
      });

      var map = new Map({
        keyboardEventTarget: document,
        layers: [
          new VectorLayer({
            source: new VectorSource({
              url: 'data/geojson/countries-110m.geojson',
              format: new GeoJSON()
            })
          })
        ],
        target: 'map',
        view: new View({
          center: [0, 0],
          projection: sphereMollweideProjection,
          resolutions: [65536, 32768, 16384, 8192, 4096, 2048],
          zoom: 0
        })
      });

      new Graticule({
        map: map
      });
    </script>
  </body>
</html>