function setProperty()

in packages/miniapp-react-dom/src/props.ts [78:130]
49 lines of code
23 McCabe index (conditional complexity)

function setProperty(dom: Element, name: string, value: unknown, oldValue?: unknown) {
  name = name === 'className' ? 'class' : name;

  if (
    name === 'key' ||
    name === 'children' ||
    name === 'ref'
  ) {
    // skip
  } else if (name === 'style') {
    const { style } = dom;
    if (isString(value)) {
      style.cssText = value;
    } else {
      if (isString(oldValue)) {
        style.cssText = '';
        oldValue = null;
      }

      if (isObject<StyleValue>(oldValue)) {
        for (const i in oldValue) {
          if (!(value && i in (value as StyleValue))) {
            setStyle(style, i, '');
          }
        }
      }

      if (isObject<StyleValue>(value)) {
        for (const i in value) {
          if (!oldValue || value[i] !== (oldValue as StyleValue)[i]) {
            setStyle(style, i, value[i]);
          }
        }
      }
    }
  } else if (isEventName(name)) {
    setEvent(dom, name, value, oldValue);
  } else if (name === 'dangerouslySetInnerHTML') {
    const newHtml = (value as DangerouslySetInnerHTML)?.__html ?? '';
    const oldHtml = (oldValue as DangerouslySetInnerHTML)?.__html ?? '';
    if (newHtml || oldHtml) {
      if (oldHtml !== newHtml) {
        dom.innerHTML = newHtml;
      }
    }
  } else if (!isFunction(value)) {
    if (value == null) {
      dom.removeAttribute(name);
    } else {
      dom.setAttribute(name, value as string);
    }
  }
}