Parse duration strings for /fseek and /seek (#565)

src/utils/duration-string-to-seconds.ts

@@ -0,0 +1,21 @@
+import parse from 'parse-duration';
+
+/**
+ * Parse duration strings to seconds.
+ * @param str any common duration format, like 1m or 1hr 30s. If the input is a number it's assumed to be in seconds.
+ * @returns seconds
+ */
+const durationStringToSeconds = (str: string) => {
+  let seconds;
+  const isInputSeconds = Boolean(/\d+$/.exec(str));
+
+  if (isInputSeconds) {
+    seconds = Number.parseInt(str, 10);
+  } else {
+    seconds = parse(str) / 1000;
+  }
+
+  return seconds;
+};
+
+export default durationStringToSeconds;