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node_modules/date-fns/getDecade.js

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+import { toDate } from "./toDate.js";
+
+/**
+ * The {@link getDecade} function options.
+ */
+
+/**
+ * @name getDecade
+ * @category Decade Helpers
+ * @summary Get the decade of the given date.
+ *
+ * @description
+ * Get the decade of the given date.
+ *
+ * @param date - The given date
+ * @param options - An object with options
+ *
+ * @returns The year of decade
+ *
+ * @example
+ * // Which decade belongs 27 November 1942?
+ * const result = getDecade(new Date(1942, 10, 27))
+ * //=> 1940
+ */
+export function getDecade(date, options) {
+  // TODO: Switch to more technical definition in of decades that start with 1
+  // end with 0. I.e. 2001-2010 instead of current 2000-2009. It's a breaking
+  // change, so it can only be done in 4.0.
+  const _date = toDate(date, options?.in);
+  const year = _date.getFullYear();
+  const decade = Math.floor(year / 10) * 10;
+  return decade;
+}
+
+// Fallback for modularized imports:
+export default getDecade;