What does this even mean?
Instead of
positionLocal.mul(4).add(time).div(2)
you can write
positionLocal * 4 + time / 2
TL;DR
JavaScript doesn’t support operator overloads.
See GitHub - tc39/proposal-operator-overloading
Status: Withdrawn
But you can do it with Python,
So here is a Threejs Python (Brython) example demonstrating operator overloads with Three TSL.
https://editor.sbcode.net/82fbdd4f408428659c4c8d8f23e2cbc653480929#L123-L123