message: Add getAttributeNames() to HTMLElement interface
diff: @@ -5,6 +5,10 @@ declare global {
  // interface Function extends Ember.FunctionPrototypeExtensions {}
  type Newable<T> = new(...args: any[]) => T; // eslint-disable-line space-infix-ops
  +
  + interface HTMLElement {
  + getAttributeNames(): string[];
  + }
  }
  export {};
  