'Vuejs + gsap.to return object instead of number

i'm trying to use tween to move object smoothly. without gsap it works correctly

this.mesh.position.x = this.rot[1]

but when i add a tween it returns an object

this.mesh.position.x = TweenMax.to(this.data, 1, { movex:this.rot[1]})

can you tell me how to use tween.to correctly?

vue.js gsap

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