Method defineCustomElement

deps/v8/tools/js/web-api-helper.mjs:277–294

(
      path, nameOrGenerator, maybeGenerator = undefined)

  }

  static defineCustomElement(
      path, nameOrGenerator, maybeGenerator = undefined) {
    let generator = nameOrGenerator;
    let name = nameOrGenerator;
    if (typeof nameOrGenerator == 'function') {
      console.assert(maybeGenerator === undefined);
      name = path.substring(path.lastIndexOf('/') + 1, path.length);
    } else {
      console.assert(typeof nameOrGenerator == 'string');
      generator = maybeGenerator;
    }
    path = path + '-template.html';
    fetch(path)
        .then(stream => stream.text())
        .then(
            templateText =>
                customElements.define(name, generator(templateText)));
  }
}