Add Prettier and ESLint tooling (Refs #77)

src/lib/ui/metrics.ts

@@ -1,17 +1,28 @@
 const numberFormat = new Intl.NumberFormat('en-US', { maximumFractionDigits: 1 });
 
 /** Label the actual bucket start in the chosen timezone; never imply local calendar-day buckets. */
-export function metricPeriodLabels(points: readonly { startAt: number }[], days: 1 | 7 | 30, timeZone: string) {
+export function metricPeriodLabels(
+    points: readonly { startAt: number }[],
+    days: 1 | 7 | 30,
+    timeZone: string
+) {
     const stride = days === 7 ? 1 : Math.max(1, Math.ceil(points.length / 6));
     const weekday = new Intl.DateTimeFormat('en-US', { timeZone, weekday: 'short' });
     const date = new Intl.DateTimeFormat('en-US', { timeZone, day: 'numeric' });
     const clock = new Intl.DateTimeFormat('en-US', { timeZone, hour: 'numeric' });
-    return points.flatMap((point, index) => index % stride ? [] : [{
-        index,
-        position: (index + 0.5) / points.length * 100,
-        label: days === 1 ? clock.format(point.startAt) : weekday.format(point.startAt),
-        date: days === 30 ? date.format(point.startAt) : ''
-    }]);
+    return points.flatMap((point, index) =>
+        index % stride
+            ? []
+            : [
+                  {
+                      index,
+                      position: ((index + 0.5) / points.length) * 100,
+                      label:
+                          days === 1 ? clock.format(point.startAt) : weekday.format(point.startAt),
+                      date: days === 30 ? date.format(point.startAt) : ''
+                  }
+              ]
+    );
 }
 
 export function metricNumber(value: number): string {
@@ -22,7 +33,7 @@ export function metricNumber(value: number): string {
 
 export function metricPercent(value: number, total: number): string {
     if (!Number.isFinite(value) || !Number.isFinite(total) || total <= 0) return '—';
-    const percent = 100 * value / total;
+    const percent = (100 * value) / total;
     return percent > 0 && percent < 0.1 ? '<0.1%' : `${percent.toFixed(1)}%`;
 }
 
@@ -38,7 +49,11 @@ export function metricDuration(hours: number): string {
 }
 
 /** Missing evidence always sorts last, in either direction. */
-export function compareMetricValues(left: number | null, right: number | null, direction: 'asc' | 'desc'): number {
+export function compareMetricValues(
+    left: number | null,
+    right: number | null,
+    direction: 'asc' | 'desc'
+): number {
     const a = left !== null && Number.isFinite(left) ? left : null;
     const b = right !== null && Number.isFinite(right) ? right : null;
     if (a === null || b === null) return a === b ? 0 : a === null ? 1 : -1;
@@ -51,5 +66,12 @@ export function metricPage<T>(rows: T[], requested: string | null, size = 15) {
     const pages = Math.max(1, Math.ceil(rows.length / size));
     const page = Math.min(pages, Number.isSafeInteger(parsed) && parsed > 0 ? parsed : 1);
     const start = (page - 1) * size;
-    return { page, pages, rows: rows.slice(start, start + size), start: rows.length ? start + 1 : 0, end: Math.min(rows.length, start + size), total: rows.length };
+    return {
+        page,
+        pages,
+        rows: rows.slice(start, start + size),
+        start: rows.length ? start + 1 : 0,
+        end: Math.min(rows.length, start + size),
+        total: rows.length
+    };
 }