It appears that the repository has undergone several changes and renamings:

backend/node_modules/date-fns/getMilliseconds.d.ts

@@ -1,19 +0,0 @@
-import type { DateArg } from "./types.js";
-/**
- * @name getMilliseconds
- * @category Millisecond Helpers
- * @summary Get the milliseconds of the given date.
- *
- * @description
- * Get the milliseconds of the given date.
- *
- * @param date - The given date
- *
- * @returns The milliseconds
- *
- * @example
- * // Get the milliseconds of 29 February 2012 11:45:05.123:
- * const result = getMilliseconds(new Date(2012, 1, 29, 11, 45, 5, 123))
- * //=> 123
- */
-export declare function getMilliseconds(date: DateArg<Date> & {}): number;