This example uses OpenLayers v10.9.0. The latest is v.
Edit

#### Geographic Editing

geographic 4

#####

Editing geometries with geographic coordinates.

Calling the `useGeographic` function in the `'ol/proj'` module makes it so the map view uses geographic coordinates (even if the view projection is not geographic).

##### main.js

    import Map from 'ol/Map.js';
    import View from 'ol/View.js';
    import GeoJSON from 'ol/format/GeoJSON.js';
    import Draw from 'ol/interaction/Draw.js';
    import Modify from 'ol/interaction/Modify.js';
    import Select from 'ol/interaction/Select.js';
    import Snap from 'ol/interaction/Snap.js';
    import VectorLayer from 'ol/layer/Vector.js';
    import {useGeographic} from 'ol/proj.js';
    import VectorSource from 'ol/source/Vector.js';

    useGeographic();

    const source = new VectorSource({
      url: 'https://openlayers.org/data/vector/us-states.json',
      format: new GeoJSON(),
    });

    const map = new Map({
      target: 'map',
      layers: [
        new VectorLayer({
          background: 'white',
          source: source,
        }),
      ],
      view: new View({
        center: [-100, 38.5],
        zoom: 4,
      }),
    });

    const select = new Select();

    const modify = new Modify({
      features: select.getFeatures(),
    });

    const draw = new Draw({
      type: 'Polygon',
      source: source,
    });

    const snap = new Snap({
      source: source,
    });

    function removeInteractions() {
      map.removeInteraction(modify);
      map.removeInteraction(select);
      map.removeInteraction(draw);
      map.removeInteraction(select);
    }

    const mode = document.getElementById('mode');
    function onChange() {
      removeInteractions();
      switch (mode.value) {
        case 'draw': {
          map.addInteraction(draw);
          map.addInteraction(snap);
          break;
        }
        case 'modify': {
          map.addInteraction(select);
          map.addInteraction(modify);
          map.addInteraction(snap);
          break;
        }
        default: {
          // pass
        }
      }
    }
    mode.addEventListener('change', onChange);
    onChange();

##### index.html

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <title>Geographic Editing</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>
        <select id="mode">
          <option value="modify">select a feature to modify</option>
          <option value="draw">draw new features</option>
        </select>

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

##### package.json

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