This example uses OpenLayers v10.9.0. The latest is v.
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#### View Min-Zoom

min 1 zoom 9

#####

Demonstrates how the view's minimum zoom level can be changed.

The `minZoom` option for a view limits how far out you can zoom. This property can be updated by calling `view.setMinZoom(newMinZoom)`. In this example, the minimum zoom level is set so that you only see one world at a time. Resize your browser window to change the threshold.

##### main.js

    import Map from 'ol/Map.js';
    import View from 'ol/View.js';
    import TileLayer from 'ol/layer/Tile.js';
    import OSM from 'ol/source/OSM.js';

    const viewport = document.getElementById('map');

    function getMinZoom() {
      const width = viewport.clientWidth;
      return Math.ceil(Math.LOG2E * Math.log(width / 256));
    }

    const initialZoom = getMinZoom();

    const view = new View({
      center: [0, 0],
      minZoom: initialZoom,
      zoom: initialZoom,
    });

    const map = new Map({
      layers: [
        new TileLayer({
          source: new OSM(),
        }),
      ],
      target: 'map',
      view: view,
    });

    window.addEventListener('resize', function () {
      const minZoom = getMinZoom();
      if (minZoom !== view.getMinZoom()) {
        view.setMinZoom(minZoom);
      }
    });

##### index.html

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <title>View Min-Zoom</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>

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

##### package.json

    {
      "name": "min-zoom",
      "dependencies": {
        "ol": "10.9.0"
      },
      "devDependencies": {
        "vite": "^3.2.3"
      },
      "scripts": {
        "start": "vite",
        "build": "vite build"
      }
    }