The ETA That Went Negative — JavaScript Bug Hunt

Briefing

Inspired by ride-hailing apps showing "-1 min" while your driver waits outside. The ETA label must never go below "Arriving now", and partial minutes always round up — a driver 61 seconds away is "2 min", not "1 min".

Fix eta.js.

Bug report

BUG-404MIN · Reported by: rider app

formatEta(msRemaining):

• under 30 seconds (including anything negative) -> "Arriving now"
• otherwise ceil to whole minutes -> "N min"

Observed: "0 min" at 20s and "-1 min" after arrival.

Logs

[eta] remaining=-32000 label="-1 min"

The code as shipped

src/ride/eta.js (editable)

// Human label for the ride ETA.
exports.formatEta = function (msRemaining) {
  var minutes = Math.floor(msRemaining / 60000);
  return minutes + " min";
};