HookConflictError

The Cause

Two hooks resolve fine but cannot both apply. Today that means two defineSample hooks on the same Transaction.

defineSample shapes the generated request, and there is one generated request per Transaction — so a second one is not a composition, it is a disagreement about what the request should be.

What to do

The error names both sides:

1 sampler hook conflicts with another hook on the same transaction.
Try this:
  * second.ts (export "two"): defineSample is already defined for the selector
    "GET /launches -> 200 (application/json)" by "one" in first.ts;
    a Transaction can have only one
  * Merge the two into one defineSample, or target a different selector.

Either merge them, or narrow one of the targets. If both were meant to run, beforeEach is the kind that composes — several of those on one Transaction all run, in registration order.

Note this is reported when the hooks are loaded, not when that Transaction happens to be reached: the mistake exists whether or not the run gets there.