This example uses OpenLayers v10.9.0. The latest is v.
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#### Vector Image Layer

vector 86 image 8

#####

Example of rendering vector data as an image layer.

This example uses `ol/layer/VectorImage` for faster rendering during interaction and animations, at the cost of less accurate rendering.

##### main.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 VectorImageLayer from 'ol/layer/VectorImage.js';
    import VectorSource from 'ol/source/Vector.js';

    const vectorLayer = new VectorImageLayer({
      background: '#1a2b39',
      imageRatio: 2,
      source: new VectorSource({
        url: 'https://openlayers.org/data/vector/ecoregions.json',
        format: new GeoJSON(),
      }),
      style: {
        'fill-color': ['string', ['get', 'COLOR'], '#eee'],
      },
    });

    const map = new Map({
      layers: [vectorLayer],
      target: 'map',
      view: new View({
        center: [0, 0],
        zoom: 1,
      }),
    });

    const featureOverlay = new VectorLayer({
      source: new VectorSource(),
      map: map,
      style: {
        'stroke-color': 'rgba(255, 255, 255, 0.7)',
        'stroke-width': 2,
      },
    });

    let highlight;
    const displayFeatureInfo = function (pixel) {
      const feature = map.forEachFeatureAtPixel(pixel, function (feature) {
        return feature;
      });

      const info = document.getElementById('info');
      if (feature) {
        info.innerHTML = feature.get('ECO_NAME') || '&nbsp;';
      } else {
        info.innerHTML = '&nbsp;';
      }

      if (feature !== highlight) {
        if (highlight) {
          featureOverlay.getSource().removeFeature(highlight);
        }
        if (feature) {
          featureOverlay.getSource().addFeature(feature);
        }
        highlight = feature;
      }
    };

    map.on('pointermove', function (evt) {
      if (evt.dragging) {
        return;
      }
      displayFeatureInfo(evt.pixel);
    });

    map.on('click', function (evt) {
      displayFeatureInfo(evt.pixel);
    });

##### index.html

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <title>Vector Image Layer</title>
        <link rel="stylesheet" href="node_modules/ol/ol.css">
        <style>
          .map {
            width: 100%;
            height: 400px;
          }
        </style>
      </head>
      <body>
        <div id="map" class="map"></div>
        <div id="info">&nbsp;</div>

        <script type="module" src="main.js"></script>
      </body>
    </html>

##### package.json

    {
      "name": "image-vector-layer",
      "dependencies": {
        "ol": "10.9.0"
      },
      "devDependencies": {
        "vite": "^3.2.3"
      },
      "scripts": {
        "start": "vite",
        "build": "vite build"
      }
    }