Function writeDirectClass

packages/core/src/render3/dom_node_manipulation.ts:130–138

* Write `className` to `RElement`. * * This function does direct write without any reconciliation. Used for writing initial values, so * that static styling values do not pull in the style parser. * * @param renderer Renderer to use * @param element The element which needs to be updated. * @p

(renderer: Renderer, element: RElement, newValue: string)

 * @param newValue The new class list to write.
 */
function writeDirectClass(renderer: Renderer, element: RElement, newValue: string) {
  ngDevMode && assertString(newValue, "'newValue' should be a string");
  if (newValue === '') {
    // There are tests in `google3` which expect `element.getAttribute('class')` to be `null`.
    renderer.removeAttribute(element, 'class');
  } else {
    renderer.setAttribute(element, 'class', newValue);
  }
}

/** Sets up the static DOM attributes on an `RNode`. */
export function setupStaticAttributes(renderer: Renderer, element: RElement, tNode: TNode) {