How to add a concat list of animations to a transform property about sparkar-pftween HOT 2 CLOSED

var aniStart = new PFTween(walker.transform.x, endX, walkSpeed).bind(v => walker.transform.x = v.scalar).clip;
var aniLoop = new PFTween(startX, endX, walkSpeed).bind(v => walker.transform.x = v.scalar).setLoops().clip;

const concat = PFTween.concat(aniStart, aniLoop);
concat();

(async () => {
    await new PFTween(walker.transform.x, endX, walkSpeed).bind(v => walker.transform.x = v.scalar).clip;
    new PFTween(startX, endX, walkSpeed).bind(v => walker.transform.x = v.scalar).setLoops().apply();
    // or 
    // walker.transform.x = new PFTween(startX ,endX, walkSpeed).setLoops().scalar;
})()