ShadTable

1.The sparkline is a hand-rolled SVG, not a charting library

Sparkline normalizes a small array of numbers to a 0..height range and joins the points into a single <polyline points="...">. For 8-12 points that's simpler and lighter than pulling in a charting dependency to draw what is, in the end, just one line.

const min = Math.min(...data)
const max = Math.max(...data)
const range = max - min || 1
const stepX = width / (data.length - 1)

const points = data
  .map((value, i) => {
    const x = i * stepX
    const y = height - ((value - min) / range) * height
    return `${x.toFixed(1)},${y.toFixed(1)}`
  })
  .join(' ')

2.Color comes from one number, reused twice

change's sign drives both the TrendingUp/TrendingDown icon and color in the Change column, and the Sparkline's text-emerald/text-rose class in the Trend column. The badge and the sparkline can never disagree about whether a metric is trending up or down — they're colored by the exact same comparison, not two separate ones.

<Sparkline
  data={row.original.trend}
  className={cn(
    'h-7 w-24',
    row.original.change >= 0
      ? 'text-emerald-600 dark:text-emerald-500'
      : 'text-rose-600 dark:text-rose-500',
  )}
/>

3.The stroke color comes from currentColor, not a prop

Sparkline's polyline sets stroke="currentColor" and takes its actual color from a Tailwind text-color class on the wrapping element — the same trick lucide-react icons use elsewhere in this library. That's how light/dark mode work for the sparkline for free, without the component itself knowing anything about the app's theme.

<polyline
  points={points}
  fill="none"
  stroke="currentColor"
  strokeWidth={1.5}
  strokeLinecap="round"
  strokeLinejoin="round"
/>

4.No sorting, filtering, or pagination — this is a dashboard widget

With a small, fixed set of KPI rows meant to all be visible at once, getSortedRowModel/getFilteredRowModel/getPaginationRowModel would just be complexity a summary card never needs. getCoreRowModel is the entire row-model pipeline here.

const table = useReactTable({
  data,
  columns,
  getCoreRowModel: getCoreRowModel(),
})

5.Formatting is unit-aware, driven by each KPI's own unit field

formatKpiValue branches on unit ('currency' | 'percent' | 'number'), so Revenue renders as $128,400, Churn Rate renders as 3.1%, and New Customers renders as a plain 482 — all from one shared formatting function instead of ad hoc .toFixed() calls scattered across column definitions.

export function formatKpiValue(value: number, unit: KpiUnit): string {
  if (unit === 'currency') {
    return value.toLocaleString('en-US', { style: 'currency', currency: 'USD', maximumFractionDigits: 0 })
  }
  if (unit === 'percent') return `${value.toFixed(1)}%`
  return value.toLocaleString('en-US')
}