This question has been addressed in 1 Texas court opinion:
COA14 — January 29, 2026
After appealing a trial court's dismissal of his claims, Ahmed Olayiwola filed a voluntary nonsuit of all underlying claims against all parties while the appeal was pending. The Fourteenth Court of Appeals examined whether the appeal could continue despite the absence of a live controversy at the trial level. Relying on the principle that appellate courts lack jurisdiction over moot disputes, the court determined that the nonsuit effectively extinguished the controversy. The court held that because there was no longer a justiciable issue for the court to resolve or a judgment that would have any practical legal effect, the appeal must be dismissed for want of jurisdiction under Rule 42.3(a).
Litigation Takeaway
“A voluntary nonsuit in the trial court acts as a 'tactical reset' that moots a pending appeal; this allows a party to effectively 'vacuum' the appellate court's jurisdiction to avoid an unfavorable precedent or a poorly developed record, provided the opposing party has not filed a counterclaim for affirmative relief.”