v1.0 with SW PWA enabled

frontend/node_modules/date-fns/parse/_lib/parsers/ISOWeekYearParser.mjs

@@ -0,0 +1,42 @@
+import { startOfISOWeek } from "../../../startOfISOWeek.mjs";
+import { constructFrom } from "../../../constructFrom.mjs";
+import { Parser } from "../Parser.mjs";
+import { parseNDigitsSigned } from "../utils.mjs";
+
+// ISO week-numbering year
+export class ISOWeekYearParser extends Parser {
+  priority = 130;
+
+  parse(dateString, token) {
+    if (token === "R") {
+      return parseNDigitsSigned(4, dateString);
+    }
+
+    return parseNDigitsSigned(token.length, dateString);
+  }
+
+  set(date, _flags, value) {
+    const firstWeekOfYear = constructFrom(date, 0);
+    firstWeekOfYear.setFullYear(value, 0, 4);
+    firstWeekOfYear.setHours(0, 0, 0, 0);
+    return startOfISOWeek(firstWeekOfYear);
+  }
+
+  incompatibleTokens = [
+    "G",
+    "y",
+    "Y",
+    "u",
+    "Q",
+    "q",
+    "M",
+    "L",
+    "w",
+    "d",
+    "D",
+    "e",
+    "c",
+    "t",
+    "T",
+  ];
+}