Function resizeKeyframedTweenInScript

packages/parsers/src/gsapParser.ts:2393–2421

(
  script: string,
  animationId: string,
  newPosition: number,
  newDuration: number,
  pctRemap: ReadonlyArray<{ from: number; to: number }>,
)

 * tween `ease` untouched. Acorn twin: resizeKeyframedTweenInScript.
 */
export function resizeKeyframedTweenInScript(
  script: string,
  animationId: string,
  newPosition: number,
  newDuration: number,
  pctRemap: ReadonlyArray<{ from: number; to: number }>,
): string {
  const loc = locateAnimationWithFallback(script, animationId);
  if (!loc) return script;
  // Array-form keyframes can't host an arbitrary re-keyed percentage —
  // normalize to object form in place first (mirrors addKeyframeToScript).
  const kfNode =
    findKeyframesObjectNode(loc.target.call.varsArg) ??
    convertArrayKeyframesToObjectNode(loc.target.call.varsArg);
  if (!kfNode) return script;

  const seen = new Set<AstNode>();
  for (const { from, to } of pctRemap) {
    const match = findKeyframePropByPct(kfNode, from);
    if (!match || seen.has(match.prop)) continue;
    seen.add(match.prop);
    // Replace only the key node; the value node (incl. _auto + per-keyframe ease)
    // stays verbatim. easeEach is a sibling non-percentage prop, left untouched.
    match.prop.key = parseExpr(`{ ${JSON.stringify(`${to}%`)}: 0 }`).properties[0].key;
  }

  applyUpdatesToCall(loc.target.call, { position: newPosition, duration: newDuration });
  return recast.print(loc.parsed.ast).code;
}

/**
 * Replace the properties (and optionally ease) at an existing keyframe percentage.