three.js/examples/js/capabilities/ImportMaps.js

( function () {
class ImportMaps {
  static isAvailable() {
    return 'supports' in HTMLScriptElement && HTMLScriptElement.supports('importmap');
  }

  static getErrorMessage() {
    const message = 'Your browser does not support <a href="https://wicg.github.io/import-maps/" style="color:blue">Import Maps</a>';
    const element = document.createElement('div');
    element.style.fontFamily = 'monospace';
    element.style.fontSize = '13px';
    element.style.fontWeight = 'normal';
    element.style.textAlign = 'center';
    element.style.background = '#fff';
    element.style.color = '#000';
    element.style.padding = '1.5em';
    element.style.width = '400px';
    element.style.margin = '5em auto 0';
    element.innerHTML = message;
    return element;
  }

}

THREE.ImportMaps as default = ImportMaps as default;
} )();