📝 Commit Details:

backend/node_modules/date-fns/interval.js

@@ -0,0 +1,49 @@
+import { normalizeDates } from "./_lib/normalizeDates.js";
+
+/**
+ * The {@link interval} function options.
+ */
+
+/**
+ * The {@link interval} function result type. It resolves the proper data type.
+ * It uses the first argument date object type, starting from the start argument,
+ * then the end interval date. If a context function is passed, it uses the context
+ * function return type.
+ */
+
+/**
+ * @name interval
+ * @category Interval Helpers
+ * @summary Creates an interval object and validates its values.
+ *
+ * @description
+ * Creates a normalized interval object and validates its values. If the interval is invalid, an exception is thrown.
+ *
+ * @typeParam StartDate - Start date type.
+ * @typeParam EndDate - End date type.
+ * @typeParam Options - Options type.
+ *
+ * @param start - The start of the interval.
+ * @param end - The end of the interval.
+ * @param options - The options object.
+ *
+ * @throws `Start date is invalid` when `start` is invalid.
+ * @throws `End date is invalid` when `end` is invalid.
+ * @throws `End date must be after start date` when end is before `start` and `options.assertPositive` is true.
+ *
+ * @returns The normalized and validated interval object.
+ */
+export function interval(start, end, options) {
+  const [_start, _end] = normalizeDates(options?.in, start, end);
+
+  if (isNaN(+_start)) throw new TypeError("Start date is invalid");
+  if (isNaN(+_end)) throw new TypeError("End date is invalid");
+
+  if (options?.assertPositive && +_start > +_end)
+    throw new TypeError("End date must be after start date");
+
+  return { start: _start, end: _end };
+}
+
+// Fallback for modularized imports:
+export default interval;