Function handleSetClassStyle

packages/sdk/src/engine/mutate.ts:970–986

(
  parsed: ParsedDocument,
  selector: string,
  styles: Record<string, string | null>,
)

// ─── setClassStyle handler ────────────────────────────────────────────────────

function handleSetClassStyle(
  parsed: ParsedDocument,
  selector: string,
  styles: Record<string, string | null>,
): MutationResult {
  const oldCss = getStyleSheet(parsed.document);
  const newCss = upsertCssRule(oldCss, selector, styles);
  if (newCss === oldCss) return EMPTY;
  setStyleSheet(parsed.document, newCss);
  const path = styleSheetPath();
  return {
    forward: [
      oldCss === "" ? { op: "add", path, value: newCss } : { op: "replace", path, value: newCss },
    ],
    inverse: [oldCss === "" ? { op: "remove", path } : { op: "replace", path, value: oldCss }],
  };
}

// ─── GSAP script patch helpers ───────────────────────────────────────────────