How to keep stroke consistent when having warp effect on?

OK - there are a few options here - none are ideal, but they might get the job done:

The first, and by far the easiest, is Layer Styles.

1. Remove the stroke from your shape layer.

2. With your shape layer selected: Menu: Layer > Layer Styles > Stroke.  Twirl down the layer in the timeline to see and adjust the properties for that.

Hopefully this will do the job for you - if not just post again and I'll point you in the direction of some other options.

It depends what you are doing - there are many 'stroke' effects in Ae.

Is this a stroke effect on a path?

A stroke (outline) around a layer boundary?

A stroke on a shape layer object?

Let us know. There are possible solutions.

Long and short: Nope. Distortion effectas just see pixels. They have no awareness of the actual content. Of course it would - in theory - be possible to code a hyper-complicated distortion matrix that retains the overall surface area and thus retains the thickness of strokes and such, but I don't know that anyone has ever bothered to actualyl create such a thing. You have to think of other options.

Mylenium