Function handleAddWithKeyframes

packages/sdk/src/engine/mutate.ts:911–931

(
  parsed: ParsedDocument,
  op: Extract<EditOp, { type: "addWithKeyframes" }>,
)

// ─── addWithKeyframes / replaceWithKeyframes handlers ────────────────────────

function handleAddWithKeyframes(
  parsed: ParsedDocument,
  op: Extract<EditOp, { type: "addWithKeyframes" }>,
): MutationResult {
  const script = getGsapScript(parsed.document);
  if (!script) throw new Error("No GSAP script block found in the composition.");
  // Dispatch skips validateOp — re-enforce the empty-keyframes guard here so we
  // never emit a degenerate `keyframes: {}` tween.
  if (op.keyframes.length === 0) return EMPTY;
  const { script: newScript, id: animationId } = addAnimationWithKeyframesToScript(
    script,
    op.targetSelector,
    op.position,
    op.duration,
    op.keyframes,
    op.ease,
  );
  if (!animationId) return EMPTY;
  setGsapScript(parsed.document, newScript);
  return { ...gsapScriptChange(script, newScript), meta: { animationId } };
}

function handleReplaceWithKeyframes(
  parsed: ParsedDocument,