How to flip a Three.js texture horizontally

To flip a texture horizontally, you can do the following:

texture.wrapS = THREE.RepeatWrapping;
texture.repeat.x = - 1;

As mentioned in the comments, this approach requires the texture to be a power-of-two in size.

three.js r.87

It might seem a bit of an overkill, but I think a nice way to do it is to turn it by 180 degrees (PI radians) around it's center then flip it:

texture.center = new THREE.Vector2(0.5, 0.5);
texture.rotation = Math.PI;
texture.flipY = false;

The answer was easier than I thought.

cylinder.scale.x = -1;

And don't forget to add

material.side = THREE.DoubleSide;