Moved code into src folder. Added build for component library.

src/lib/query.ts

@@ -0,0 +1,31 @@
+import { NextApiRequest } from 'next';
+import { getAllowedUnits, getMinimumUnit } from './date';
+import { getWebsiteDateRange } from '../queries';
+
+export async function parseDateRangeQuery(req: NextApiRequest) {
+  const { id: websiteId, startAt, endAt, unit } = req.query;
+
+  // All-time
+  if (+startAt === 0 && +endAt === 1) {
+    const result = await getWebsiteDateRange(websiteId as string);
+    const { min, max } = result[0];
+    const startDate = new Date(min);
+    const endDate = new Date(max);
+
+    return {
+      startDate,
+      endDate,
+      unit: getMinimumUnit(startDate, endDate),
+    };
+  }
+
+  const startDate = new Date(+startAt);
+  const endDate = new Date(+endAt);
+  const minUnit = getMinimumUnit(startDate, endDate);
+
+  return {
+    startDate,
+    endDate,
+    unit: (getAllowedUnits(startDate, endDate).includes(unit as string) ? unit : minUnit) as string,
+  };
+}