add typescript support in svelte files, .js to .ts

src/lib/helper/timeElapsed.ts

@@ -0,0 +1,33 @@
+const MINUTE = 60;
+const HOUR = 60 * MINUTE;
+const DAY = 24 * HOUR;
+const YEAR = 365 * DAY;
+const MONTH = YEAR / 12;
+
+/**
+ * get readable string of time elapsed since date
+ * @param {Date} date
+ * @returns string
+ */
+export default function timeElapsed(date) {
+	const now = new Date();
+	const age = Math.floor((now.getTime() - date.getTime()) / 1000);
+
+	const years = Math.floor(age / YEAR);
+	let remainder = age % YEAR;
+	const months = Math.floor(remainder / MONTH);
+	remainder %= MONTH;
+	const days = Math.floor(remainder / DAY);
+	remainder %= DAY;
+	const hours = Math.floor(remainder / HOUR);
+	remainder %= HOUR;
+	const minutes = Math.floor(remainder / MINUTE);
+	const seconds = remainder % MINUTE;
+	if (years > 0) return years === 1 ? 'vor 1 Jahr' : `vor ${years} Jahren`;
+	if (months > 0) return months === 1 ? 'vor 1 Monat' : `vor ${months} Monaten`;
+	if (days > 0) return days === 1 ? 'vor 1 Tag' : `vor ${days} Tagen`;
+	if (hours > 0) return hours === 1 ? 'vor 1 Stunde' : `vor ${hours} Stunden`;
+	if (minutes > 0) return minutes === 1 ? 'vor 1 Minute' : `vor ${minutes} Minuten`;
+
+	return seconds === 1 ? 'vor 1 Sekunde' : `vor ${seconds} Sekunden`;
+}