@globalfishingwatch/react-map-gl/dist/es6/utils/geolocate-utils.js

A React wrapper for MapboxGL-js and overlay API.

let supported;
export function isGeolocationSupported() {
  if (supported !== undefined) {
    return Promise.resolve(supported);
  }

  if (window.navigator.permissions !== undefined) {
    return window.navigator.permissions.query({
      name: 'geolocation'
    }).then(p => {
      supported = p.state !== 'denied';
      return supported;
    });
  }

  supported = Boolean(window.navigator.geolocation);
  return Promise.resolve(supported);
}
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