Sparkline

An inline SVG trend line — a sparkline — that shows the shape of a series in about the space of a line of text. Use it when you need a chart small enough to live inside something else: a 7-day or 30-day trend next to a KPI in a stat card or dashboard tile, a per-row usage or activity graph in a table (requests, spend, errors, signups, page views), a mini price or metric history, a tiny “last N days” graph in a list item, or any micro / inline / thumbnail chart where axes, gridlines, a legend and a tooltip would just be noise. It renders as a plain <svg> with no hooks, no state and no effects, so it works unchanged inside a React Server Component, in a static export, and with JavaScript disabled — there is no “use client” in the file. Different from shadcn/ui’s official chart, which is a ~10KB wrapper around Recharts (it declares recharts@2.15.4 as a dependency and also pulls in card) meant for full charts with axes, tooltips and legends: this is one zero-dependency file that draws a single path and needs nothing but your cn util. Different from gauge and progress-ring, which draw one current value as an arc rather than a series over time. It handles the parts hand-written sparklines get wrong: null, undefined and NaN entries are treated as gaps that keep their slot on the x axis and break the line, instead of being dropped (which slides the rest of the series sideways) or drawn as zero (which invents a crash that is not in the data); a flat series is centred rather than dividing by zero and emitting a NaN path that silently renders nothing at all; the plot area is inset by half the stroke so the highest and lowest points are not sliced in half by the viewport edge; vector-effect=“non-scaling-stroke” keeps the line an even weight when the SVG is stretched across a wide table cell, and the last-value dot is drawn as a round line cap so it stays a circle instead of being squashed into an ellipse by that same stretch. Pass min and max to pin the scale so a whole column of sparklines is actually comparable — autoscale every row to its own extremes and they all end up looking like the same shape. It also ships an aria-label generated from the data (“12 points, up from 3 to 91, low 3, high 94”), where shadcn’s own chart.tsx sets no role=“img” or aria-label of its own; pass your own aria-label to override it, or aria-hidden when a surrounding stat card already announces the number. Props: data, width, height, min, max, strokeWidth, area, showLast, formatValue.