Function checkStylingProperty

packages/core/src/render3/instructions/styling.ts:203–231

(
  prop: string,
  value: any | NO_CHANGE,
  suffix: string | undefined | null,
  isClassBased: boolean,
)

 * @param isClassBased `true` if `class` change (`false` if `style`)
 */
export function checkStylingProperty(
  prop: string,
  value: any | NO_CHANGE,
  suffix: string | undefined | null,
  isClassBased: boolean,
): void {
  const lView = getLView();
  const tView = getTView();
  // Styling instructions use 2 slots per binding.
  // 1. one for the value / TStylingKey
  // 2. one for the intermittent-value / TStylingRange
  const bindingIndex = incrementBindingIndex(2);
  if (tView.firstUpdatePass) {
    stylingFirstUpdatePass(tView, prop, bindingIndex, isClassBased);
  }
  if (value !== NO_CHANGE && bindingUpdated(lView, bindingIndex, value)) {
    const tNode = tView.data[getSelectedIndex()] as TNode;
    updateStyling(
      tView,
      tNode,
      lView,
      lView[RENDERER],
      prop,
      (lView[bindingIndex + 1] = normalizeSuffix(value, suffix)),
      isClassBased,
      bindingIndex,
    );
  }
}

/**
 * Common code between `ɵɵclassMap` and `ɵɵstyleMap`.