Function formatTokens

src/format.ts:10–18

(n: number)

export { formatCost }

export function formatTokens(n: number): string {
  // Guard against Infinity / NaN / negatives that would otherwise leak into
  // the UI as "Infinity" or "NaN" strings when an upstream calculation glitches.
  if (!Number.isFinite(n)) return '?'
  if (n < 0) return '0'
  if (n >= 1_000_000) return `${(n / 1_000_000).toFixed(1)}M`
  if (n >= 1_000) return `${(n / 1_000).toFixed(1)}K`
  return Math.round(n).toString()
}

/// Returns YYYY-MM-DD for the given date in the process-local timezone. Cheaper than shelling
/// out to Intl.DateTimeFormat for every turn in a loop and avoids the UTC drift that bites